Mohamed A.

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

Most recently, I was the sole developer on a fintech payments platform — built from zero to production, including backend, frontend (Next.js), admin dashboard, and mobile apps. That included integrating Stripe, KYC/identity providers, and on-chain transaction tracking via webhooks — reconciling data across multiple third-party systems while keeping user balances and transaction state accurate and consistent, on a live product with real users.

🚀 What I Can Help You Build:
✅ SaaS platforms and MVPs, backend-first or full-stack
✅ REST & GraphQL APIs, microservices, event-driven architecture
✅ Payment & billing systems — Stripe, subscriptions, balances, revenue-split logic
✅ Webhook-driven integrations between third-party systems that don't natively agree
✅ AI-powered features — OpenAI API integration for search, comparison, and generation workflows
✅ Real-time systems — WebSockets, Socket IO, notifications, live data
✅ Database architecture — PostgreSQL, MongoDB, schema design for multi-tenant systems
✅ Cloud deployment & scaling — AWS (EC2, ECS, Fargate, S3), Docker, Kubernetes

🛠 Technical Stack:
✅ Backend: Node.js, NestJS, Express.js, TypeScript, JavaScript
✅ Frontend: Next.js, React.js
✅ Databases: PostgreSQL, MySQL, MongoDB (Mongoose), Prisma, TypeORM
✅ Messaging & Caching: RabbitMQ, Redis, Queues, Socket IO
✅ AI & Automation: OpenAI API, LLM-powered workflows, Claude Code-driven development
✅ Cloud & DevOps: AWS, GCP, Docker, Kubernetes, CI/CD pipelines
✅ Payments: Stripe, third-party payment/KYC providers, webhook reconciliation
✅ Testing: Unit & integration testing, regression testing on live systems
✅ Also comfortable with: Python (working knowledge), Java Spring Boot

Recent Projects:
✅ Fintech payments platform — solo full-stack build: Node.js/NestJS backend, Next.js frontend, mobile apps, payments and KYC integration
✅ 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

I specialize in taking systems from "it mostly works" to production-grade — clean architecture, reliable integrations, and code that holds up under real usage, not just demos. Whether you need a backend built from scratch, an existing platform stabilized and scaled, or third-party systems wired together reliably, I bring ownership from day one and clear communication throughout.