Hamza J.

I help founders and product teams ship production backends and AI systems on cloud — APIs, serverless, RAG, and workflows on real data — not demos and not throwaway MVPs. Top Rated · $80k+ on Upwork · 27 reviews · 34 completed jobs. Clients consistently cite expert AWS/TypeScript/serverless delivery, excellent code quality, clear teaching and handoff, and long-term collaboration. WHAT I ENGINEER (AI Systems Engineering) • Production backends — NestJS/Node, Postgres/DynamoDB, event-driven APIs • Cloud-native systems — AWS Lambda, API Gateway, Cognito; GCP Cloud Run; Azure SSO patterns • AI in production — RAG/document Q&A, LangChain backends, MCP integrations, conversational AI with handoff, AI OS agents and workflows on real data • Auth & platforms — OAuth, JWT, Passkeys-class patterns; multi-tenant SaaS foundations PROOF — shipped systems • Fintech auth at scale — Passkeys & social login (Deriv, NestJS) • Enterprise expense ops — serverless employee/admin portals + Azure SSO (Forte Construction) • Marketplace backend — search, feeds, event-driven commerce (Circlin) • Medical staffing — serverless portals + ATS/Bullhorn integrations (Frontera Search Partners) • AI document & chat backends — LangChain, RAG, serverless deploy paths (V1 Digital, legal-tech) • GCP data pipeline modernization — Flask → Cloud Run + Scheduler; ~80% cost reduction on a major pipeline (Upwork client) • Document AI for construction quotes — OCR + LLM + rules on AWS (Textract-class patterns) WHAT CLIENTS SAY (from Upwork reviews) • "Expert in AWS, TypeScript and Serverless" — repeat collaborator, highly recommended (Ferhat K.) • "One of the best freelancers I have ever worked with" — rapid, cost-efficient cloud-native delivery; fantastic teacher (Neil B.) • Collaborating 1+ year; detail-oriented; not afraid of new challenges (Victor S.) • "Pillar of support" — depth of knowledge, thorough, covers all angles (Danny T.) • Excellent code quality and pointed architectural input (Pablo R.) • Knowledgeable AWS, clear English, hire again (Yuanbo G.) START FAST — PROJECT CATALOG Fixed packages for NestJS API starters, RAG/PDF Q&A, AWS deploy, WhatsApp FAQ bots, and landing pages — scoped deliverables in days, then expand to full systems. CUSTOM ENGAGEMENTS Platforms, marketplace backends, ops portals, and AI layers — milestone-based with source code and deploy notes. Stack: TypeScript · NestJS · AWS · GCP · PostgreSQL · DynamoDB · LangChain · OpenAI · Docker Dubai, UAE — own visa, fully authorized to work in UAE. Remote US/EU/MENA. Message with your system, stack, and timeline — or order a Catalog package to start.