Mohamed A.

I'm a senior Node.js / NestJS backend developer with 7+ years building production SaaS, fintech, and e-commerce systems — with full-stack range across Next.js and React when you need one person to own the whole build.

Most recently I was the sole developer on a fintech payments platform, from zero to production: NestJS/FastAPI backend, Next.js frontend, admin dashboard, and mobile apps. I integrated Stripe, KYC/identity providers, and on-chain transaction tracking via webhooks — reconciling data across multiple systems while keeping balances and transaction state accurate on a live product with real users.

🤖 AI features, agents & MCP
✅ OpenAI API integrations — search, comparison, generation, structured outputs
✅ LLM workflows embedded into existing products, not demos
✅ AI agent backends — tool/function calling, guardrails, retries, and queues that make them reliable
✅ MCP servers in Node.js/TypeScript — expose your APIs and internal tools to Claude, ChatGPT and other MCP clients
✅ Claude Code-driven development for faster delivery with reviewed code

🚀 What I can help you build
✅ SaaS platforms and MVPs, backend-first or full-stack
✅ REST & GraphQL APIs, microservices, event-driven architecture
✅ Payment and billing systems — Stripe, subscriptions, balances, revenue splits
✅ Webhook-driven integrations between systems that don't natively agree
✅ Real-time systems — WebSockets, SocketIO, notifications, live data
✅ Database architecture — PostgreSQL, MongoDB, multi-tenant schema design
✅ Cloud deployment — AWS (EC2, ECS, Fargate, S3), Docker, Kubernetes

🛠 Technical stack
Backend: Node.js, NestJS, Express.js, TypeScript, JavaScript, Python, FastAPI
Frontend: Next.js, React.js
Data: PostgreSQL, MySQL, MongoDB, Prisma, TypeORM, Redis
Messaging: RabbitMQ, BullMQ, queues, SocketIO
AI: OpenAI API, LLM workflows, MCP servers, Claude Code
Cloud & DevOps: AWS, GCP, Docker, Kubernetes, CI/CD
Payments: Stripe, KYC providers, webhook reconciliation
Testing: unit, integration, and regression testing on live systems

Recent work
✅ Fintech payments platform — solo full-stack build: NestJS/FastAPI backend, Next.js frontend, mobile apps, payments and KYC
✅ E-commerce marketplace — full backend ownership: system design, development, testing, deployment, DB design, plus OpenAI-powered product search ✅ E-commerce platform — 2 years as backend engineer on a live production system