diff --git a/src/backend/index.ts b/src/backend/index.ts
index 8131dadcf8..504ebdf3c0 100644
--- a/src/backend/index.ts
+++ b/src/backend/index.ts
@@ -1,4 +1,4 @@
-import express from 'express';
+import express, { Router } from 'express';
 import cors from 'cors';
 import cookieParser from 'cookie-parser';
 import { getUserAndOrganization, prodHeaders, requireJwtDev, requireJwtProd } from './src/utils/auth.utils';
@@ -17,7 +17,7 @@ import wbsElementTemplatesRouter from './src/routes/wbs-element-templates.routes
 import carsRouter from './src/routes/cars.routes';
 import organizationRouter from './src/routes/organizations.routes';
 import recruitmentRouter from './src/routes/recruitment.routes';
-import { slackEvents } from './src/routes/slack.routes';
+import { getReceiver } from './src/integrations/slack';
 import announcementsRouter from './src/routes/announcements.routes';
 import onboardingRouter from './src/routes/onboarding.routes';
 import popUpsRouter from './src/routes/pop-up.routes';
@@ -25,6 +25,8 @@ import statisticsRouter from './src/routes/statistics.routes';
 import retrospectiveRouter from './src/routes/retrospective.routes';
 import partsRouter from './src/routes/parts.routes';
 import financeRouter from './src/routes/finance.routes';
+// Import slack routes (event listeners will be registered if Slack is configured)
+import './src/routes/slack.routes';
 
 const app = express();
 
@@ -61,9 +63,15 @@ const options: cors.CorsOptions = {
   allowedHeaders
 };
 
-// so we can listen to slack messages
-// NOTE: must be done before using json
-app.use('/slack', slackEvents.requestListener());
+// Mount Slack Bolt receiver BEFORE other middleware to handle raw body parsing
+// Bolt's receiver handles its own body parsing and request verification
+// The receiver is configured to handle requests at /slack/events
+// Only mount if Slack is configured (when SLACK_BOT_TOKEN is set)
+const receiver = getReceiver();
+if (receiver) {
+  app.use(receiver.router as unknown as Router);
+}
+
 app.get('/health', (_req, res) => {
   res.status(200).json({ status: 'healthy' });
 });
diff --git a/src/backend/package.json b/src/backend/package.json
index 92ec84d984..6f1f592282 100644
--- a/src/backend/package.json
+++ b/src/backend/package.json
@@ -10,8 +10,7 @@
   },
   "dependencies": {
     "@prisma/client": "^6.2.1",
-    "@slack/events-api": "^3.0.1",
-    "@slack/web-api": "^7.8.0",
+    "@slack/bolt": "^3.22.0",
     "@types/concat-stream": "^2.0.0",
     "@types/cookie-parser": "^1.4.3",
     "@types/cors": "^2.8.12",
diff --git a/src/backend/src/controllers/slack.controllers.ts b/src/backend/src/controllers/slack.controllers.ts
index e7336711d2..cec8a072ae 100644
--- a/src/backend/src/controllers/slack.controllers.ts
+++ b/src/backend/src/controllers/slack.controllers.ts
@@ -1,6 +1,6 @@
-import { getWorkspaceId } from '../integrations/slack';
+import { getWorkspaceId, replyToMessageInThread } from '../integrations/slack';
 import OrganizationsService from '../services/organizations.services';
-import SlackServices from '../services/slack.services';
+import SlackServices, { SlackBlockActionBody, SaboSubmissionActionValue } from '../services/slack.services';
 
 export default class SlackController {
   static async processMessageEvent(event: any) {
@@ -15,4 +15,71 @@ export default class SlackController {
       console.log(error);
     }
   }
+
+  /**
+   * Handles the Slack block action for SABO submission confirmation.
+   * Performs action-specific validation and extracts relevant fields from the Slack action body.
+   * If validation fails, replies to the user in Slack with an error message.
+   *
+   * @param body The validated Slack block action body (general structure validated in routes)
+   */
+  static async handleSaboSubmittedAction(body: SlackBlockActionBody) {
+    const { user, container, actions } = body;
+    const channelId = container.channel_id;
+    const threadTs = container.thread_ts || container.message_ts;
+    const [firstAction] = actions;
+
+    try {
+      // Action-specific validation: verify action_id
+      if (firstAction.action_id !== 'sabo_submitted_confirmation') {
+        console.error('Unexpected action_id:', firstAction.action_id);
+        await replyToMessageInThread(
+          channelId,
+          threadTs,
+          `❌ An error occurred: Unexpected action type "${firstAction.action_id}". Please contact the software team.`
+        );
+        return;
+      }
+
+      // Action-specific validation: verify value format
+      let actionValue: SaboSubmissionActionValue;
+      try {
+        actionValue = JSON.parse(firstAction.value);
+      } catch (parseError) {
+        const parseErrorMsg = parseError instanceof Error ? parseError.message : 'Unknown parse error';
+        await replyToMessageInThread(
+          channelId,
+          threadTs,
+          `❌ An error occurred: Invalid action data format.\n\n*Error:* ${parseErrorMsg}\n*Value:* \`${firstAction.value}\`\n\nPlease contact the software team.`
+        );
+        return;
+      }
+
+      // Validate that reimbursementRequestId exists in the parsed value
+      if (!actionValue.reimbursementRequestId || typeof actionValue.reimbursementRequestId !== 'string') {
+        const actionValueStr = JSON.stringify(actionValue, null, 2);
+        await replyToMessageInThread(
+          channelId,
+          threadTs,
+          `❌ An error occurred: Missing or invalid reimbursement request ID.\n\n*Parsed value:*\n\`\`\`${actionValueStr}\`\`\`\n\nPlease contact the software team.`
+        );
+        return;
+      }
+
+      // Extract validated fields
+      const userSlackId = user.id;
+      const { reimbursementRequestId } = actionValue;
+
+      // Pass the extracted fields to the service layer for business logic
+      await SlackServices.handleSaboSubmittedAction(userSlackId, reimbursementRequestId);
+    } catch (error: unknown) {
+      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+      await replyToMessageInThread(
+        channelId,
+        threadTs,
+        `❌ An unexpected error occurred while processing your request.\n\n*Error message:* ${errorMessage}\n\nPlease contact the software team and provide them with this information.`
+      );
+      throw error;
+    }
+  }
 }
diff --git a/src/backend/src/integrations/slack.ts b/src/backend/src/integrations/slack.ts
index 6e855acae7..acf390437d 100644
--- a/src/backend/src/integrations/slack.ts
+++ b/src/backend/src/integrations/slack.ts
@@ -1,7 +1,49 @@
-import { ChatPostMessageResponse, WebClient } from '@slack/web-api';
+import { App, ExpressReceiver } from '@slack/bolt';
 import { HttpException } from '../utils/errors.utils';
 
-const slack = new WebClient(process.env.SLACK_BOT_TOKEN);
+let receiver: ExpressReceiver | null = null;
+let slackApp: App | null = null;
+let slack: any = null; // Type will be inferred from slackApp.client (WebClient from Bolt)
+
+/**
+ * Initializes the Slack Bolt app, receiver, and client if not already initialized
+ * Only initializes if SLACK_BOT_TOKEN is present
+ */
+const initializeSlack = () => {
+  const { SLACK_BOT_TOKEN, SLACK_SIGNING_SECRET } = process.env;
+
+  // Don't initialize if no token is configured (e.g., in tests)
+  if (!SLACK_BOT_TOKEN) {
+    return;
+  }
+
+  // Don't re-initialize if already initialized
+  if (slackApp) {
+    return;
+  }
+
+  // Initialize the receiver, app, and client
+  receiver = new ExpressReceiver({
+    signingSecret: SLACK_SIGNING_SECRET || '',
+    endpoints: '/slack/events'
+  });
+
+  slackApp = new App({
+    token: SLACK_BOT_TOKEN,
+    receiver
+  });
+
+  slack = slackApp.client;
+};
+
+/**
+ * Get the Slack WebClient (initializes Slack if needed)
+ * @returns the Slack WebClient or null if no token is configured
+ */
+const getSlackClient = () => {
+  initializeSlack();
+  return slack;
+};
 
 /**
  * Send a slack message
@@ -12,14 +54,13 @@ const slack = new WebClient(process.env.SLACK_BOT_TOKEN);
  * @returns the channel id and timestamp of the created slack message
  */
 export const sendMessage = async (slackId: string, message: string, link?: string, linkButtonText?: string) => {
-  const { SLACK_BOT_TOKEN } = process.env;
-  if (!SLACK_BOT_TOKEN) return;
+  const client = getSlackClient();
+  if (!client) return;
 
   const block = generateSlackTextBlock(message, link, linkButtonText);
 
   try {
-    const response: ChatPostMessageResponse = await slack.chat.postMessage({
-      token: SLACK_BOT_TOKEN,
+    const response = await client.chat.postMessage({
       channel: slackId,
       text: message,
       blocks: [block],
@@ -47,14 +88,13 @@ export const replyToMessageInThread = async (
   link?: string,
   linkButtonText?: string
 ) => {
-  const { SLACK_BOT_TOKEN } = process.env;
-  if (!SLACK_BOT_TOKEN) return;
+  const client = getSlackClient();
+  if (!client) return;
 
   const block = generateSlackTextBlock(message, link, linkButtonText);
 
   try {
-    await slack.chat.postMessage({
-      token: SLACK_BOT_TOKEN,
+    await client.chat.postMessage({
       channel: slackId,
       thread_ts: parentTimestamp,
       text: message,
@@ -80,14 +120,13 @@ export const editMessage = async (
   link?: string,
   linkButtonText?: string
 ) => {
-  const { SLACK_BOT_TOKEN } = process.env;
-  if (!SLACK_BOT_TOKEN) return;
+  const client = getSlackClient();
+  if (!client) return;
 
   const block = generateSlackTextBlock(message, link, linkButtonText);
 
   try {
-    await slack.chat.update({
-      token: SLACK_BOT_TOKEN,
+    await client.chat.update({
       channel: slackId,
       ts: timestamp,
       text: message,
@@ -105,12 +144,11 @@ export const editMessage = async (
  * @param emoji - the emoji to react with
  */
 export const reactToMessage = async (slackId: string, parentTimestamp: string, emoji: string) => {
-  const { SLACK_BOT_TOKEN } = process.env;
-  if (!SLACK_BOT_TOKEN) return;
+  const client = getSlackClient();
+  if (!client) return;
 
   try {
-    await slack.reactions.add({
-      token: SLACK_BOT_TOKEN,
+    await client.reactions.add({
       channel: slackId,
       timestamp: parentTimestamp,
       name: emoji
@@ -161,12 +199,15 @@ const generateSlackTextBlock = (message: string, link?: string, linkButtonText?:
  * @returns an array of strings of all the slack ids of the users in the given channel
  */
 export const getUsersInChannel = async (channelId: string) => {
+  const client = getSlackClient();
+  if (!client) return [];
+
   let members: string[] = [];
   let cursor: string | undefined;
 
   try {
     do {
-      const response = await slack.conversations.members({
+      const response = await client.conversations.members({
         channel: channelId,
         cursor,
         limit: 200
@@ -192,8 +233,11 @@ export const getUsersInChannel = async (channelId: string) => {
  * @returns the name of the channel or undefined if it cannot be found
  */
 export const getChannelName = async (channelId: string) => {
+  const client = getSlackClient();
+  if (!client) return undefined;
+
   try {
-    const channelRes = await slack.conversations.info({ channel: channelId });
+    const channelRes = await client.conversations.info({ channel: channelId });
     return channelRes.channel?.name;
   } catch (error) {
     return undefined;
@@ -206,8 +250,11 @@ export const getChannelName = async (channelId: string) => {
  * @returns the name of the user (real name if no display name), undefined if cannot be found
  */
 export const getUserName = async (userId: string) => {
+  const client = getSlackClient();
+  if (!client) return undefined;
+
   try {
-    const userRes = await slack.users.info({ user: userId });
+    const userRes = await client.users.info({ user: userId });
     return userRes.user?.profile?.display_name || userRes.user?.real_name;
   } catch (error) {
     return undefined;
@@ -219,8 +266,13 @@ export const getUserName = async (userId: string) => {
  * @returns the id of the workspace
  */
 export const getWorkspaceId = async () => {
+  const client = getSlackClient();
+  if (!client) {
+    throw new HttpException(500, 'Slack client not configured');
+  }
+
   try {
-    const response = await slack.auth.test();
+    const response = await client.auth.test();
     if (response.ok) {
       return response.team_id;
     }
@@ -230,4 +282,57 @@ export const getWorkspaceId = async () => {
   }
 };
 
-export default slack;
+/**
+ * Sends a slack ephemeral message to a user
+ * @param channelId - the channel id of the channel to send to
+ * @param threadTs - the timestamp of the thread to send to
+ * @param userId - the id of the user to send to
+ * @param text - the text of the message to send (should always be populated in case blocks can't be rendered, but if blocks render text will not)
+ * @param blocks - the blocks of the message to send
+ */
+export async function sendEphemeralMessage(
+  channelId: string,
+  threadTs: string,
+  userId: string,
+  text: string,
+  blocks: any[]
+) {
+  const client = getSlackClient();
+  if (!client) return;
+
+  try {
+    await client.chat.postEphemeral({
+      channel: channelId,
+      user: userId,
+      thread_ts: threadTs,
+      text,
+      blocks
+    });
+  } catch (err: unknown) {
+    if (err instanceof Error) {
+      throw new HttpException(500, `Failed to send slack notifications: ${err.message}`);
+    }
+  }
+}
+
+/**
+ * Get the Slack Bolt app instance (initializes Slack if needed)
+ * @returns the Slack Bolt App or null if no token is configured
+ */
+export const getSlackApp = (): App | null => {
+  initializeSlack();
+  return slackApp;
+};
+
+/**
+ * Get the Express receiver instance (initializes Slack if needed)
+ * @returns the ExpressReceiver or null if no token is configured
+ */
+export const getReceiver = (): ExpressReceiver | null => {
+  initializeSlack();
+  return receiver;
+};
+
+// Export the getters for any direct usage if needed
+export { getSlackClient };
+export default getSlackClient;
diff --git a/src/backend/src/routes/slack.routes.ts b/src/backend/src/routes/slack.routes.ts
index 6878b176b1..46de14bb3f 100644
--- a/src/backend/src/routes/slack.routes.ts
+++ b/src/backend/src/routes/slack.routes.ts
@@ -1,8 +1,123 @@
-import { createEventAdapter } from '@slack/events-api';
+import { getSlackApp } from '../integrations/slack';
 import SlackController from '../controllers/slack.controllers';
 
-export const slackEvents = createEventAdapter(process.env.SLACK_SIGNING_SECRET || '');
+// Register Slack event listeners only if the Slack app is configured
+const slackApp = getSlackApp();
 
-slackEvents.on('message', SlackController.processMessageEvent);
+if (slackApp) {
+  // Register message event listener
+  slackApp.message(async ({ message, logger }: any) => {
+    try {
+      await SlackController.processMessageEvent(message);
+    } catch (error) {
+      logger.error('Error processing message event:', error);
+      console.error(error);
+    }
+  });
+}
 
-slackEvents.on('error', console.log);
+/**
+ * Validates the general structure of a Slack block action payload.
+ * This validation is action-agnostic and only checks that the required fields exist.
+ * Action-specific validation (like action_id and value format) happens in the controller.
+ *
+ * @param body The Slack action body to validate
+ * @returns true if valid, false otherwise
+ */
+function validateSlackActionBody(body: any): boolean {
+  // Check required top-level fields
+  if (!body || typeof body !== 'object') {
+    console.error('Invalid body: not an object');
+    return false;
+  }
+
+  if (body.type !== 'block_actions') {
+    console.error('Invalid body type:', body.type);
+    return false;
+  }
+
+  // Validate user object
+  if (!body.user || typeof body.user !== 'object') {
+    console.error('Invalid or missing user object');
+    return false;
+  }
+
+  if (!body.user.id || typeof body.user.id !== 'string') {
+    console.error('Invalid or missing user.id');
+    return false;
+  }
+
+  if (!body.user.team_id || typeof body.user.team_id !== 'string') {
+    console.error('Invalid or missing user.team_id');
+    return false;
+  }
+
+  // Validate actions array exists and has at least one action
+  if (!Array.isArray(body.actions) || body.actions.length === 0) {
+    console.error('Invalid or empty actions array');
+    return false;
+  }
+
+  const [action] = body.actions;
+  if (!action.action_id || typeof action.action_id !== 'string') {
+    console.error('Invalid or missing action_id');
+    return false;
+  }
+
+  if (!action.value || typeof action.value !== 'string') {
+    console.error('Invalid or missing action value');
+    return false;
+  }
+
+  // Validate container object (for message timestamp and channel)
+  if (!body.container || typeof body.container !== 'object') {
+    console.error('Invalid or missing container object');
+    return false;
+  }
+
+  if (!body.container.message_ts || typeof body.container.message_ts !== 'string') {
+    console.error('Invalid or missing container.message_ts');
+    return false;
+  }
+
+  if (!body.container.channel_id || typeof body.container.channel_id !== 'string') {
+    console.error('Invalid or missing container.channel_id');
+    return false;
+  }
+
+  // Validate thread_ts if it exists (optional but if present should be string)
+  if (body.container.thread_ts && typeof body.container.thread_ts !== 'string') {
+    console.error('Invalid container.thread_ts type');
+    return false;
+  }
+
+  return true;
+}
+
+if (slackApp) {
+  // Register interactive action handler for SABO submission confirmation
+  slackApp.action('sabo_submitted_confirmation', async ({ ack, body, logger, respond }: any) => {
+    await ack();
+
+    try {
+      // Validate the incoming action body structure
+      if (!validateSlackActionBody(body)) {
+        logger.error('Invalid Slack action body structure');
+        return;
+      }
+
+      await SlackController.handleSaboSubmittedAction(body);
+
+      // If no error, delete the original message
+      await respond({ delete_original: true });
+    } catch (error) {
+      // Can't pass to normal middleware because not normal request
+      logger.error('Error handling sabo_submitted_confirmation action:', error);
+    }
+  });
+
+  // Error handler
+  slackApp.error(async (error: Error) => {
+    console.error('Slack app error:', error);
+  });
+}
diff --git a/src/backend/src/services/reimbursement-requests.services.ts b/src/backend/src/services/reimbursement-requests.services.ts
index 9463ba88a5..0b5459ae20 100644
--- a/src/backend/src/services/reimbursement-requests.services.ts
+++ b/src/backend/src/services/reimbursement-requests.services.ts
@@ -418,12 +418,26 @@ export default class ReimbursementRequestService {
         totalCost,
         accountCodeId: accountCode.accountCodeId,
         vendorId: vendor.vendorId
+      },
+      include: {
+        notificationSlackThreads: true
       }
     });
 
     //set any deleted receipts with a dateDeleted
     await removeDeletedReceiptPictures(receiptPictures, oldReimbursementRequest.receiptPictures || [], submitter);
 
+    try {
+      await sendPendingSaboSubmissionNotification(
+        updatedReimbursementRequest.notificationSlackThreads,
+        submitter.userId,
+        updatedReimbursementRequest.recipientId,
+        updatedReimbursementRequest.reimbursementRequestId
+      );
+    } catch (e: unknown) {
+      console.error('Error sending pending SABO submission notification:', e);
+    }
+
     return updatedReimbursementRequest;
   }
 
@@ -1292,7 +1306,8 @@ export default class ReimbursementRequestService {
       await sendPendingSaboSubmissionNotification(
         reimbursementRequest.notificationSlackThreads,
         submitter.userId,
-        reimbursementRequest.recipientId
+        reimbursementRequest.recipientId,
+        reimbursementRequest.reimbursementRequestId
       );
     } catch (e: unknown) {
       console.error('Error sending pending SABO submission notification:', e);
@@ -2075,7 +2090,7 @@ export default class ReimbursementRequestService {
     // find all names that have been tagged in the @FirstLast format
     const taggedNames = [...comment.matchAll(tagRegex)].map((match) => match[1]);
 
-    // spliot the tagged names into first and last names
+    // split the tagged names into first and last names
     const splitTaggedNames = taggedNames.map((name) => {
       const match = name.match(/([A-Z][a-z'-]+)([A-Z][a-z'-]+)/);
 
diff --git a/src/backend/src/services/slack.services.ts b/src/backend/src/services/slack.services.ts
index a289124013..16e379a98c 100644
--- a/src/backend/src/services/slack.services.ts
+++ b/src/backend/src/services/slack.services.ts
@@ -1,9 +1,10 @@
 import { getChannelName, getUserName } from '../integrations/slack';
 import AnnouncementService from './announcement.services';
-import { Announcement } from 'shared';
+import { Announcement, ReimbursementStatusType } from 'shared';
 import prisma from '../prisma/prisma';
 import { blockToMentionedUsers, blockToString } from '../utils/slack.utils';
-import { NotFoundException } from '../utils/errors.utils';
+import { InvalidOrganizationException, NotFoundException } from '../utils/errors.utils';
+import ReimbursementRequestService from './reimbursement-requests.services';
 
 /**
  * Represents a slack event for a message in a channel.
@@ -66,7 +67,138 @@ export interface SlackRichTextBlock {
   usergroup_id?: string;
 }
 
+/**
+ * Represents a Slack block action body structure.
+ * The general structure is validated in routes, while action-specific fields
+ * (action_id and value format) are validated in controllers.
+ */
+export interface SlackBlockActionBody {
+  type: 'block_actions';
+  user: {
+    id: string;
+    username: string;
+    name: string;
+    team_id: string;
+  };
+  api_app_id: string;
+  token: string;
+  container: {
+    type: string;
+    message_ts: string;
+    channel_id: string;
+    is_ephemeral: boolean;
+    thread_ts?: string; // Optional - if present, the message is in a thread
+  };
+  trigger_id: string;
+  team: {
+    id: string;
+    domain: string;
+  };
+  enterprise: null | {
+    id: string;
+    name: string;
+  };
+  is_enterprise_install: boolean;
+  channel: {
+    id: string;
+    name: string;
+  };
+  state: {
+    values: Record<string, any>;
+  };
+  response_url: string;
+  actions: Array<{
+    action_id: string; // Validated in controller, not routes
+    block_id: string;
+    text?: any;
+    value: string; // Validated for format in controller, not routes
+    style?: string;
+    type: string;
+    action_ts: string;
+  }>;
+}
+
+/**
+ * Represents the parsed value from a SABO submission action
+ */
+export interface SaboSubmissionActionValue {
+  reimbursementRequestId: string;
+}
+
 export default class SlackServices {
+  /**
+   * Handles the Slack button click for marking a reimbursement request as SABO submitted.
+   * This performs the business logic for processing the SABO submission confirmation.
+   *
+   * @param userSlackId The Slack user ID of the user who clicked the button
+   * @param teamSlackId The Slack team ID (workspace ID) where the action occurred
+   * @param reimbursementRequestId The ID of the reimbursement request to mark as submitted
+   * @param interactiveMessageTs The timestamp of the interactive message (to delete after processing)
+   */
+  static async handleSaboSubmittedAction(userSlackId: string, reimbursementRequestId: string): Promise<void> {
+    // Find the user by their slack ID
+    const user = await prisma.user.findFirst({
+      where: {
+        userSettings: {
+          slackId: userSlackId
+        }
+      }
+    });
+
+    if (!user) {
+      console.error('User not found for slack ID:', userSlackId);
+      throw new NotFoundException('User', userSlackId);
+    }
+
+    // Find the reimbursement request
+    const reimbursementRequest = await prisma.reimbursement_Request.findUnique({
+      where: {
+        reimbursementRequestId
+      },
+      include: {
+        organization: true,
+        reimbursementStatuses: true,
+        notificationSlackThreads: true
+      }
+    });
+
+    if (!reimbursementRequest) {
+      throw new NotFoundException('Reimbursement Request', reimbursementRequestId);
+    }
+
+    // Verify that the user's organization matches the reimbursement request's organization
+    const userOrganization = await prisma.user.findFirst({
+      where: {
+        userId: user.userId
+      },
+      include: {
+        organizations: true
+      }
+    });
+
+    const hasAccess = userOrganization?.organizations.some(
+      (org) => org.organizationId === reimbursementRequest.organizationId
+    );
+
+    if (!hasAccess) {
+      throw new InvalidOrganizationException('Reimbursement Request');
+    }
+
+    // If the reimbursement request has already been submitted to SABO, just return (message will be deleted by route)
+    if (
+      reimbursementRequest.reimbursementStatuses.some((status) => status.type === ReimbursementStatusType.SABO_SUBMITTED)
+    ) {
+      return;
+    }
+
+    // Call the service function to mark as SABO submitted
+    await ReimbursementRequestService.markReimbursementRequestAsSaboSubmitted(
+      reimbursementRequestId,
+      user,
+      reimbursementRequest.organization
+    );
+  }
+
   /**
    * Given a slack event representing a message in a channel,
    * make the appropriate announcement change in prisma.
diff --git a/src/backend/src/utils/auth.utils.ts b/src/backend/src/utils/auth.utils.ts
index ed51775e1d..4517b3a88a 100644
--- a/src/backend/src/utils/auth.utils.ts
+++ b/src/backend/src/utils/auth.utils.ts
@@ -33,7 +33,7 @@ export const requireJwtProd = (req: Request, res: Response, next: NextFunction)
     req.path === '/users/auth/login' || // logins dont have cookies yet
     req.path === '/' || // base route is available so aws can listen and check the health
     req.method === 'OPTIONS' || // this is a pre-flight request and those don't send cookies
-    req.path === '/slack' // slack http endpoint is only used from slack api
+    req.path.startsWith('/slack') // slack endpoints (events and interactions) are only used from slack api
   ) {
     return next();
   } else if (
@@ -65,7 +65,7 @@ export const requireJwtDev = (req: Request, res: Response, next: NextFunction) =
     req.path === '/' || // base route is available so aws can listen and check the health
     req.method === 'OPTIONS' || // this is a pre-flight request and those don't send cookies
     req.path === '/users' || // dev login needs the list of users to log in
-    req.path === '/slack' // slack http endpoint is only used from slack api
+    req.path.startsWith('/slack') // slack endpoints (events and interactions) are only used from slack api
   ) {
     next();
   } else if (
@@ -185,7 +185,7 @@ export const getUserAndOrganization = async (req: Request, res: Response, next:
     req.path === '/' || // base route is available so aws can listen and check the health
     req.method === 'OPTIONS' || // this is a pre-flight request and those don't send cookies
     req.path === '/users' || // dev login needs the list of users to log in
-    req.path === '/slack' || // slack http endpoint is only used from slack api
+    req.path.startsWith('/slack') || // slack endpoints (events and interactions) are only used from slack api
     req.path.startsWith('/notifications') // Notifications route has its own auth, only called from gh
   ) {
     return next();
diff --git a/src/backend/src/utils/finance.utils.ts b/src/backend/src/utils/finance.utils.ts
index 5c64bf1da4..75c698ade4 100644
--- a/src/backend/src/utils/finance.utils.ts
+++ b/src/backend/src/utils/finance.utils.ts
@@ -8,43 +8,49 @@ export const getProjectSegmentedWhereInput = (
 ): {
   where: {
     wbsElement: {
-      organizationId: string;
-      dateDeleted: null;
-      carNumber?: number;
-      dateCreated?: { gte?: Date; lte?: Date };
+      is: {
+        organizationId: string;
+        dateDeleted: null;
+        carNumber?: number;
+        dateCreated?: { gte?: Date; lte?: Date };
+      };
     };
   };
 } => {
   const baseWhere: {
     where: {
       wbsElement: {
-        organizationId: string;
-        dateDeleted: null;
-        carNumber?: number;
-        dateCreated?: { gte?: Date; lte?: Date };
+        is: {
+          organizationId: string;
+          dateDeleted: null;
+          carNumber?: number;
+          dateCreated?: { gte?: Date; lte?: Date };
+        };
       };
     };
   } = Prisma.validator<Prisma.ProjectFindManyArgs>()({
     where: {
       wbsElement: {
-        organizationId,
-        dateDeleted: null
+        is: {
+          organizationId,
+          dateDeleted: null
+        }
       }
     }
   });
 
-  if (startDate) {
-    baseWhere.where.wbsElement.dateCreated = {
+  if (startDate !== undefined) {
+    baseWhere.where.wbsElement.is.dateCreated = {
       gte: startDate
     };
   }
 
-  if (endDate) {
-    baseWhere.where.wbsElement.dateCreated = { ...baseWhere.where.wbsElement.dateCreated, lte: endDate };
+  if (endDate !== undefined) {
+    baseWhere.where.wbsElement.is.dateCreated = { ...baseWhere.where.wbsElement.is.dateCreated, lte: endDate };
   }
 
   if (carNumber !== undefined) {
-    baseWhere.where.wbsElement.carNumber = carNumber;
+    baseWhere.where.wbsElement.is.carNumber = carNumber;
   }
 
   return baseWhere;
@@ -80,7 +86,7 @@ export const getReimbursementRequestWhereInput = (
     })
   };
 
-  if (carNumber !== undefined) {
+  if (carNumber) {
     baseWhere.reimbursementProducts = {
       some: {
         OR: [
diff --git a/src/backend/src/utils/slack.utils.ts b/src/backend/src/utils/slack.utils.ts
index 91cea13067..e5ed33dbe4 100644
--- a/src/backend/src/utils/slack.utils.ts
+++ b/src/backend/src/utils/slack.utils.ts
@@ -16,6 +16,7 @@ import {
   getUsersInChannel,
   reactToMessage,
   replyToMessageInThread,
+  sendEphemeralMessage,
   sendMessage
 } from '../integrations/slack';
 import { getUserSlackId, getUserSlackMentionOrName } from './users.utils';
@@ -235,12 +236,58 @@ export const sendSubmittedToSaboNotification = async (threads: SlackMessageThrea
 export const sendPendingSaboSubmissionNotification = async (
   threads: SlackMessageThread[],
   financeUserId: string,
-  pendingSubmissionFromId: string
+  pendingSubmissionFromId: string,
+  reimbursementRequestId: string
 ) => {
   await sendThreadResponse(
     threads,
     `${await getUserSlackMentionOrName(financeUserId)} has added this reimbursement request to Concur. ${await getUserSlackMentionOrName(pendingSubmissionFromId)}, please check your email to approve the request in Concur and mark it as submitted on Finishline.`
   );
+  const userId = await getUserSlackId(financeUserId);
+  if (threads && threads.length !== 0 && userId) {
+    const msgs = threads.map((thread) =>
+      sendEphemeralMessage(
+        thread.channelId,
+        thread.timestamp,
+        userId,
+        'Approve the request on concur and then click the button below to mark it as submitted on Finishline.',
+        [
+          {
+            type: 'section',
+            text: {
+              type: 'mrkdwn',
+              text: 'Approve the request on concur and then click the button below to mark it as submitted on Finishline.'
+            }
+          },
+          {
+            type: 'section',
+            text: {
+              type: 'mrkdwn',
+              text: '<https://us2.concursolutions.com/home|*Click here to go to concur*>'
+            }
+          },
+          {
+            type: 'actions',
+            elements: [
+              {
+                type: 'button',
+                text: {
+                  type: 'plain_text',
+                  text: "✓ I've approved the request on Concur"
+                },
+                style: 'primary',
+                action_id: 'sabo_submitted_confirmation',
+                value: JSON.stringify({
+                  reimbursementRequestId
+                })
+              }
+            ]
+          }
+        ]
+      )
+    );
+    await Promise.all(msgs);
+  }
 };
 
 export const sendSlackDesignReviewConfirmNotification = async (
diff --git a/yarn.lock b/yarn.lock
index 6e5ea4207e..e0d2d26377 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4816,27 +4816,34 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@slack/events-api@npm:^3.0.1":
-  version: 3.0.1
-  resolution: "@slack/events-api@npm:3.0.1"
-  dependencies:
-    "@types/debug": ^4.1.4
-    "@types/express": ^4.17.0
-    "@types/lodash.isstring": ^4.0.6
-    "@types/node": ">=12.13.0 < 13"
-    "@types/yargs": ^15.0.4
-    debug: ^2.6.1
-    express: ^4.0.0
-    lodash.isstring: ^4.0.1
+"@slack/bolt@npm:^3.22.0":
+  version: 3.22.0
+  resolution: "@slack/bolt@npm:3.22.0"
+  dependencies:
+    "@slack/logger": ^4.0.0
+    "@slack/oauth": ^2.6.3
+    "@slack/socket-mode": ^1.3.6
+    "@slack/types": ^2.13.0
+    "@slack/web-api": ^6.13.0
+    "@types/express": ^4.16.1
+    "@types/promise.allsettled": ^1.0.3
+    "@types/tsscmp": ^1.0.0
+    axios: ^1.7.4
+    express: ^4.21.0
+    path-to-regexp: ^8.1.0
+    promise.allsettled: ^1.0.2
     raw-body: ^2.3.3
     tsscmp: ^1.0.6
-    yargs: ^15.3.1
-  dependenciesMeta:
-    express:
-      optional: true
-  bin:
-    slack-verify: dist/verify.js
-  checksum: ce62dc2ee9dd93b88820e18f88f543228740243dc390caf49b3a7e1ad351b298e3961898bd78f5eb43e9f6acac067458257cd34c9661089f684bb5cf4af468c3
+  checksum: edd5c7cf658808effde87c936f19a0cc2b7d49ac97471651f2b1bb3db0074b92dc8ad3c9657577105d93c48df9ba16c382902c0d90082854cbbe86bfc7753827
+  languageName: node
+  linkType: hard
+
+"@slack/logger@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "@slack/logger@npm:3.0.0"
+  dependencies:
+    "@types/node": ">=12.0.0"
+  checksum: 6512d0e9e4be47ea465705ab9b6e6901f36fa981da0d4a657fde649d452b567b351002049b5ee0a22569b5119bf6c2f61befd5b8022d878addb7a99c91b03389
   languageName: node
   linkType: hard
 
@@ -4849,30 +4856,58 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@slack/types@npm:^2.17.0":
-  version: 2.17.0
-  resolution: "@slack/types@npm:2.17.0"
-  checksum: 57cad4b3153589707fef50c7a231921364d10d8f4a3e4d342c718d4aa69f5b3541fee686e8b2d93d46dd4c9842adebe5d3bae6530e4ad8719c1ec5d46b0ec157
+"@slack/oauth@npm:^2.6.3":
+  version: 2.6.3
+  resolution: "@slack/oauth@npm:2.6.3"
+  dependencies:
+    "@slack/logger": ^3.0.0
+    "@slack/web-api": ^6.12.1
+    "@types/jsonwebtoken": ^8.3.7
+    "@types/node": ">=12"
+    jsonwebtoken: ^9.0.0
+    lodash.isstring: ^4.0.1
+  checksum: 6b556da01bd2b026177b4074cd44bdeff00165fb4297ef8f350035ca79ababfff0c0993a297a46ab742bb97469c6c1c8f5790c328ecf6370290fe31014ba3c5e
   languageName: node
   linkType: hard
 
-"@slack/web-api@npm:^7.8.0":
-  version: 7.11.0
-  resolution: "@slack/web-api@npm:7.11.0"
+"@slack/socket-mode@npm:^1.3.6":
+  version: 1.3.6
+  resolution: "@slack/socket-mode@npm:1.3.6"
   dependencies:
-    "@slack/logger": ^4.0.0
-    "@slack/types": ^2.17.0
-    "@types/node": ">=18.0.0"
-    "@types/retry": 0.12.0
-    axios: ^1.11.0
-    eventemitter3: ^5.0.1
-    form-data: ^4.0.4
+    "@slack/logger": ^3.0.0
+    "@slack/web-api": ^6.12.1
+    "@types/node": ">=12.0.0"
+    "@types/ws": ^7.4.7
+    eventemitter3: ^5
+    finity: ^0.5.4
+    ws: ^7.5.3
+  checksum: a84c15a6d25a21f76258d1ccebeec1d78b0a0dac0b02ffdfcb3596e7acda5459e4b99a42207eab7e57bed7a2a1d85ac173adf5e07aa66949eac9cc9df3b43947
+  languageName: node
+  linkType: hard
+
+"@slack/types@npm:^2.11.0, @slack/types@npm:^2.13.0":
+  version: 2.18.0
+  resolution: "@slack/types@npm:2.18.0"
+  checksum: c425b528924be74fb8e8de0e1883199b088ce427a8d7217998ee77c0cce817464be102383801e142ab531430b7fd1a1f9b9deed2b7a9e3df1c67a24a1d7348a1
+  languageName: node
+  linkType: hard
+
+"@slack/web-api@npm:^6.12.1, @slack/web-api@npm:^6.13.0":
+  version: 6.13.0
+  resolution: "@slack/web-api@npm:6.13.0"
+  dependencies:
+    "@slack/logger": ^3.0.0
+    "@slack/types": ^2.11.0
+    "@types/is-stream": ^1.1.0
+    "@types/node": ">=12.0.0"
+    axios: ^1.7.4
+    eventemitter3: ^3.1.0
+    form-data: ^2.5.0
     is-electron: 2.2.2
-    is-stream: ^2
-    p-queue: ^6
-    p-retry: ^4
-    retry: ^0.13.1
-  checksum: 52c26b169111d15a6ef0701b947291ee97a8f4e795f9ee509ec90c56a4ef72f9776a3d35e54d7fa329b0479e7f193539e2e095b3ee0704a775bf66d960dfacf0
+    is-stream: ^1.1.0
+    p-queue: ^6.6.1
+    p-retry: ^4.0.0
+  checksum: 77f0d506bbb011ae43d322e5152e8b1ec2b88aa01256da6b3c9ff8ce106d2284f887cad2d9f044e0fe34dc865d60f2bce1c6bb5c4117150ff71a7ef341f5dfeb
   languageName: node
   linkType: hard
 
@@ -5853,7 +5888,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/debug@npm:^4.0.0, @types/debug@npm:^4.1.4":
+"@types/debug@npm:^4.0.0":
   version: 4.1.12
   resolution: "@types/debug@npm:4.1.12"
   dependencies:
@@ -5976,7 +6011,19 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/express@npm:^4.17.0, @types/express@npm:^4.17.13":
+"@types/express@npm:^4.16.1":
+  version: 4.17.25
+  resolution: "@types/express@npm:4.17.25"
+  dependencies:
+    "@types/body-parser": "*"
+    "@types/express-serve-static-core": ^4.17.33
+    "@types/qs": "*"
+    "@types/serve-static": ^1
+  checksum: 285d16008489d37b2be03e2e050bcf201d5d6ed9278ca13619d9029efd2055b192b2445f769116f716cfcf53d9d799a03f4e76199af9cea0ea3dee3d88595931
+  languageName: node
+  linkType: hard
+
+"@types/express@npm:^4.17.13":
   version: 4.17.23
   resolution: "@types/express@npm:4.17.23"
   dependencies:
@@ -6043,6 +6090,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/is-stream@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "@types/is-stream@npm:1.1.0"
+  dependencies:
+    "@types/node": "*"
+  checksum: 23fcb06cd8adc0124d4c44071bd4b447c41f5e4c2eccb6166789c7fc0992b566e2e8b628a3800ff4472b686d9085adbec203925068bf72e350e085650e83adec
+  languageName: node
+  linkType: hard
+
 "@types/istanbul-lib-coverage@npm:*, @types/istanbul-lib-coverage@npm:^2.0.0, @types/istanbul-lib-coverage@npm:^2.0.1":
   version: 2.0.6
   resolution: "@types/istanbul-lib-coverage@npm:2.0.6"
@@ -6092,7 +6148,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/jsonwebtoken@npm:^8.5.8, @types/jsonwebtoken@npm:^8.5.9":
+"@types/jsonwebtoken@npm:^8.3.7, @types/jsonwebtoken@npm:^8.5.8, @types/jsonwebtoken@npm:^8.5.9":
   version: 8.5.9
   resolution: "@types/jsonwebtoken@npm:8.5.9"
   dependencies:
@@ -6101,22 +6157,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/lodash.isstring@npm:^4.0.6":
-  version: 4.0.9
-  resolution: "@types/lodash.isstring@npm:4.0.9"
-  dependencies:
-    "@types/lodash": "*"
-  checksum: ef381be69b459caa42d7c5dc4ff5b3653e6b3c9b2393f6e92848efeafe7690438e058b26f036b11b4e535fc7645ff12d1203847b9a82e9ae0593bdd3b25a971b
-  languageName: node
-  linkType: hard
-
-"@types/lodash@npm:*":
-  version: 4.17.20
-  resolution: "@types/lodash@npm:4.17.20"
-  checksum: dc7bb4653514dd91117a4c4cec2c37e2b5a163d7643445e4757d76a360fabe064422ec7a42dde7450c5e7e0e7e678d5e6eae6d2a919abcddf581d81e63e63839
-  languageName: node
-  linkType: hard
-
 "@types/mdast@npm:^4.0.0":
   version: 4.0.4
   resolution: "@types/mdast@npm:4.0.4"
@@ -6188,10 +6228,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:>=12.13.0 < 13":
-  version: 12.20.55
-  resolution: "@types/node@npm:12.20.55"
-  checksum: e4f86785f4092706e0d3b0edff8dca5a13b45627e4b36700acd8dfe6ad53db71928c8dee914d4276c7fd3b6ccd829aa919811c9eb708a2c8e4c6eb3701178c37
+"@types/node@npm:>=12, @types/node@npm:>=12.0.0":
+  version: 24.9.2
+  resolution: "@types/node@npm:24.9.2"
+  dependencies:
+    undici-types: ~7.16.0
+  checksum: 6f1d2c66ce14ef58934c7140b8b7003b3e55fc3b23128bfdabdf59a02f4ff4dbb89a58cd95cc11310cce6c6ffeb5cacc3afaa8753d4a9cd4afdc447a6ab61bee
   languageName: node
   linkType: hard
 
@@ -6228,6 +6270,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/promise.allsettled@npm:^1.0.3":
+  version: 1.0.6
+  resolution: "@types/promise.allsettled@npm:1.0.6"
+  checksum: 07dca8da25b49c0dc323201095552d86159483dc910dc61c345357c9c196b8498e6be4bf260cc2a9a539a725108df61b53db1d82723ed9886bb7c72fedd65f14
+  languageName: node
+  linkType: hard
+
 "@types/prop-types@npm:*, @types/prop-types@npm:^15.7.12, @types/prop-types@npm:^15.7.14, @types/prop-types@npm:^15.7.15":
   version: 15.7.15
   resolution: "@types/prop-types@npm:15.7.15"
@@ -6385,6 +6434,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/serve-static@npm:^1":
+  version: 1.15.10
+  resolution: "@types/serve-static@npm:1.15.10"
+  dependencies:
+    "@types/http-errors": "*"
+    "@types/node": "*"
+    "@types/send": <1
+  checksum: f216eef2aaf2c8eff09f431c420c5c2989eaf0dfc15d106db9fb64c14577a4059af24fb0ae2eba7984d6360950c8cbc1fb52f65608106477729d251481bc96fe
+  languageName: node
+  linkType: hard
+
 "@types/sockjs@npm:^0.3.33":
   version: 0.3.36
   resolution: "@types/sockjs@npm:0.3.36"
@@ -6436,6 +6496,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/tsscmp@npm:^1.0.0":
+  version: 1.0.2
+  resolution: "@types/tsscmp@npm:1.0.2"
+  checksum: c02c0bb9f14f550947fea9fa6f9f3c28e6b2d47a6d049a5450ed466fb0c8a685b6ff37d070d4c43d930a5affc9d828f5e16e35cde1e734de228ffd2df76ac2a8
+  languageName: node
+  linkType: hard
+
 "@types/unist@npm:*, @types/unist@npm:^3.0.0":
   version: 3.0.3
   resolution: "@types/unist@npm:3.0.3"
@@ -6464,6 +6531,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/ws@npm:^7.4.7":
+  version: 7.4.7
+  resolution: "@types/ws@npm:7.4.7"
+  dependencies:
+    "@types/node": "*"
+  checksum: b4c9b8ad209620c9b21e78314ce4ff07515c0cadab9af101c1651e7bfb992d7fd933bd8b9c99d110738fd6db523ed15f82f29f50b45510288da72e964dedb1a3
+  languageName: node
+  linkType: hard
+
 "@types/ws@npm:^8.5.5":
   version: 8.18.1
   resolution: "@types/ws@npm:8.18.1"
@@ -6480,15 +6556,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/yargs@npm:^15.0.4":
-  version: 15.0.19
-  resolution: "@types/yargs@npm:15.0.19"
-  dependencies:
-    "@types/yargs-parser": "*"
-  checksum: 6a509db36304825674f4f00300323dce2b4d850e75819c3db87e9e9f213ac2c4c6ed3247a3e4eed6e8e45b3f191b133a356d3391dd694d9ea27a0507d914ef4c
-  languageName: node
-  linkType: hard
-
 "@types/yargs@npm:^16.0.0":
   version: 16.0.9
   resolution: "@types/yargs@npm:16.0.9"
@@ -7533,6 +7600,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"array.prototype.map@npm:^1.0.5":
+  version: 1.0.8
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+  languageName: node
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+  languageName: node
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+  resolution: "iterate-value@npm:1.0.2"
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+  languageName: node
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+  languageName: node
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+
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+
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-    decamelize: ^1.2.0
-  checksum: 60e8c7d1b85814594d3719300ecad4e6ae3796748b0926137bfec1f3042581b8646d67e83c6fc80a692ef08b8390f21ddcacb9464476c39bbdf52e34961dd4d9
-  languageName: node
-  linkType: hard
-
 "yargs-parser@npm:^20.2.2":
   version: 20.2.9
   resolution: "yargs-parser@npm:20.2.9"
@@ -22714,25 +22850,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"yargs@npm:^15.3.1":
-  version: 15.4.1
-  resolution: "yargs@npm:15.4.1"
-  dependencies:
-    cliui: ^6.0.0
-    decamelize: ^1.2.0
-    find-up: ^4.1.0
-    get-caller-file: ^2.0.1
-    require-directory: ^2.1.1
-    require-main-filename: ^2.0.0
-    set-blocking: ^2.0.0
-    string-width: ^4.2.0
-    which-module: ^2.0.0
-    y18n: ^4.0.0
-    yargs-parser: ^18.1.2
-  checksum: 40b974f508d8aed28598087720e086ecd32a5fd3e945e95ea4457da04ee9bdb8bdd17fd91acff36dc5b7f0595a735929c514c40c402416bbb87c03f6fb782373
-  languageName: node
-  linkType: hard
-
 "yargs@npm:^16.2.0":
   version: 16.2.0
   resolution: "yargs@npm:16.2.0"