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stephenvelasquez/README.md

Stephen Velasquez

I build products that work — and I build them across domains. Fifteen years shipping software at Amazon, Walmart, Microsoft, and the US Department of the Treasury, spanning supply chain, edge compute, fintech, defense tech, healthcare, AI, and platform infrastructure.

What my Microsoft coworkers said they valued most: range. I've led products in game engine simulation, defense-grade mesh networking, treasury financial systems, and cloud infrastructure — each requiring different technical depth, different stakeholders, and different definitions of "done." That range compounds. Every domain I've shipped in makes the next one faster and the decisions sharper.

At Microsoft I was dual-hatted across business and engineering for public and private market infrastructure, shipped Unity-based simulation products, and built edge compute systems for defense. At Amazon and Walmart I owned supply chain products where latency is measured in trucks, not milliseconds. At Treasury I led fintech product and engineering as a director. Every role reinforced the same lesson: the best technical product leaders don't just write specs — they write code, read data, and make hard calls when the room is split.

Now I run ZipHealthy, a behavioral health and consulting practice in Northwest Arkansas. I open-source the tools and frameworks I actually use.


My GitHub Game

What's here

AI & Intelligent Systems

Repo Stack What it does
AI Agents agent-orchestrator TypeScript ReAct loops, tool dispatch, goal decomposition, memory, guardrails
Experimentation experiment-lab Python A/B test design, power analysis, significance testing

Systems & Infrastructure

Repo Stack What it does
Defense Edge defense-edge-mesh Rust DDIL-tolerant mesh networking, store-and-forward, partition recovery
Edge Compute edge-compute-simulator Rust Edge node placement, latency modeling, hybrid cloud orchestration
Supply Chain supply-chain-optimizer Go Demand forecasting, inventory optimization, fulfillment routing
Platform SRE platform-health-dashboard K8s / Python SLO tracking, dependency mapping, incident scoring
Security zero-trust-access-engine Go ABAC policy engine, tamper-evident audit logging, FedRAMP-aligned

Domain-Specific Engineering

Repo Stack What it does
Simulation unity-simulation-framework C# / Unity Entity lifecycle, physics pipelines, scenario orchestration, telemetry
Fintech fintech-ledger-engine Python Double-entry ledger, multi-currency reconciliation, treasury management
Healthcare healthcare-data-pipeline TypeScript HIPAA-compliant PHI anonymization and clinical event processing
Data Quality data-quality-monitor SQL / dbt Schema drift detection, anomaly detection, pipeline observability

Product & Growth

Repo Stack What it does
Strategy market-sizing-engine Python Bottoms-up TAM/SAM/SOM modeling from real data
Shipping feature-flag-router Python Feature flags with targeting, rollouts, and kill switches
Growth retention-cohort-analyzer Python Cohort retention analysis and LTV projections
Technical api-design-playbook Markdown API design principles from a product perspective
Craft product-spec-system Markdown End-to-end product development system — specs to post-launch

Languages & Technologies

Go · Rust · TypeScript · Python · C# · SQL · Kubernetes · Unity · dbt · Docker

Background

  • Amazon · Walmart · Microsoft · US Department of the Treasury
  • VP-level technical product management across supply chain, fintech, defense tech, edge compute, healthcare, and AI
  • MBA, Cornell University
  • Licensed Clinical Social Worker
  • US Air Force & US Army Veteran

Say hello

LinkedIn · Website · info@ziphealthy.com


github-contribution-grid-snake

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  1. agent-orchestrator agent-orchestrator Public

    Production-grade AI agent orchestration — ReAct loops, tool dispatch, goal decomposition, memory, and guardrails in TypeScript.

    TypeScript 1

  2. defense-edge-mesh defense-edge-mesh Public

    DDIL-tolerant mesh networking for tactical edge environments — store-and-forward, partition recovery, priority routing in Rust.

    Rust 1

  3. fintech-ledger-engine fintech-ledger-engine Public

    Double-entry ledger engine for financial transaction processing, multi-currency reconciliation, and treasury cash management in Python.

    Python 2 1

  4. supply-chain-optimizer supply-chain-optimizer Public

    Demand forecasting, inventory optimization, and fulfillment routing in Go. Built from patterns shipping supply chain products at Amazon and Walmart.

    Go 1

  5. unity-simulation-framework unity-simulation-framework Public

    Modular simulation framework for Unity — entity lifecycle, physics pipelines, scenario orchestration, and telemetry in C#.

    C# 1

  6. zero-trust-access-engine zero-trust-access-engine Public

    ABAC policy engine, tamper-evident audit logging, and FedRAMP-aligned access control in Go.

    Go 2