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martinpercu/README.md

Hey, I'm Martin 👋

Full-Stack Engineer & AI Solutions Architect based in NYC.
I specialize in building autonomous AI agents and scalable web architectures. With a background as a 2x Founder, I bridge the gap between complex engineering and business impact.

[US Permanent Resident - Ready for On-site roles in NYC]


🚀 Featured Projects

🤖 TalentGraph AI-Powered Recruitment Platform

  • Developing an autonomous recruitment agent using LangGraph for multi-step HR workflows.
  • Implementing persistent checkpoints (PostgreSQL) and structured outputs to ensure reliability in long-running LLM chains.
  • Architecture: Angular 19 + FastAPI + LangGraph + PostgreSQL.

🔧 AI-Trainer-Teacher Intelligent RAG-powered Educational Platform → live demo

  • Engineered a hierarchical RAG pipeline with dynamic page filtering, reducing irrelevant context by 70%.
  • Implemented history-aware question reformulation and Redis-backed session persistence for multi-turn learning.
  • Impact: Faster retrieval and higher precision by narrowing vector search scope to specific document sections.

🛠️ LangGraph Agent Templates Production-Ready Agentic Patterns

  • A comprehensive repository of 6 core agentic workflows: ReAct, Orchestrator-Worker, Parallelization, and Evaluator-Optimizer.
  • Features modular architecture with Jinja2 prompting and PostgreSQL checkpointing for stateful conversations.

🔐 OAuth 2.0 & JWT Flows Security Implementation Guide

  • Deep-dive implementations of Auth Code, PKCE, and Client Credentials. Real-world integrations with Spotify, Discord, and Twitch APIs using JWT.

🛠 Tech Stack

AI Engineering: LangGraph • LangChain • RAG Orchestration • Model Routing • Vector DBs (Pinecone/Chroma)
Frontend: Angular 19 (Signals/Standalone) • React (Vite/Context) • Vue.js • Tailwind CSS
Backend: Node.js • TypeScript • Python (FastAPI/Flask) • RESTful APIs
Data & Cloud: PostgreSQL • Redis • MongoDB • Firebase • Docker • CI/CD (GitHub Actions)
Business Tech: Stripe API (Complex Subscriptions) • OAuth 2.0 • Product Analytics


⚡ Quick Facts

  • 📍 Based in NYC (Green Card holder, no sponsorship required).
  • 🏢 Former CEO & Founder: Ex-Drinkko & 4TIMP. I build with "Product Ownership" in mind.
  • 🎓 Continuous Learner: Music conservatory background 🎸 → 40+ Technical Certifications.
  • 🌍 Trilingual: English, French, Spanish (Fluent).
  • 🛠 Workflow: Cursor & Claude Code power user (Agentic Dev workflow).

🤝 Let's Connect

📧 info@mart-in.us
🔗 LinkedInPortfolioCertifications


"The quick shall inherit the earth. I ship clean, performant code every week."

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  1. Talent-Graph Talent-Graph Public

    AI-powered recruitment platform with LangGraph agent backend. Features intelligent candidate screening, multi-model orchestration (GPT-4o-mini + Claude Haiku), streaming conversations, and PostgreS…

    TypeScript

  2. AI-Trainer-Teacher AI-Trainer-Teacher Public

    AI-powered educational platform with intelligent RAG-based chat assistant. Features context-aware learning with PDF knowledge retrieval, adaptive exam system with auto-save, and comprehensive admin…

    TypeScript

  3. Langchain-Langgraph_Agents-Structure Langchain-Langgraph_Agents-Structure Public

    Production-ready template for complex AI agents using LangGraph and LangChain. Implements RAG, ReAct, routing, parallelization, and orchestrator patterns with FastAPI backend and PostgreSQL checkpo…

    Jupyter Notebook 1

  4. JWT-OAuth-flows JWT-OAuth-flows Public

    Practical guide to OAuth 2.0 authentication flows. Implements Authorization Code, PKCE, Implicit, and Client Credentials flows with real-world examples (Spotify, X/Twitter, Twitch, Discord) using J…

    JavaScript

  5. React-Ecommerce-SPA React-Ecommerce-SPA Public

    E-commerce SPA built with React, Vite, and Tailwind CSS. Features global state management with Context API, React Router, product filtering, shopping cart, and order history. Demonstrates modern Re…

    JavaScript

  6. Angular17-Ecommerce-SPA Angular17-Ecommerce-SPA Public

    E-commerce SPA built with Angular 17, showcasing signals, standalone components, lazy loading, and modern Angular patterns. Features product catalog, cart management, routing, and API integration w…

    TypeScript