Muhammad Umer

Designed and delivered secure enterprise applications using React, Node.js, TypeScript and AWS cloud technologies. Built API-driven integrations connecting external platforms, payment services and business-critical systems. Developed cloud-native microservices supporting secure transaction processing and workflow automation. Implemented security controls, authentication mechanisms and compliance-focused development practices. Collaborated with stakeholders to evaluate integration strategies, migration plans and technical solutions. Created technical documentation and deployment procedures supporting long-term platform maintainability. Provided production support and troubleshooting for mission-critical enterprise applications.

Led architecture and delivery across a portfolio of B2B and consumer products in healthcare, fintech, and operations with ownership from database schema to production deployment. Shipped multiple React Native apps to the App Store and Google Play, owning end-to-end release pipeline via Expo/EAS and store release tooling. Designed backends using Node.js (NestJS/Express), Python (FastAPI/Django), and Ruby on Rails on PostgreSQL; built REST/WebSocket APIs for real-time features. Introduced LLM/RAG patterns including an agentic workflow shipped with evaluation harnesses and rollback paths. Built Stripe integrations (Elements Checkout, Connect, webhook handling with idempotency and reconciliation). Added analytics/retention funnels using Mixpanel and Segment and improved flagship 30-day retention. Optimized performance using Redis caching and query/endpoint rewrites; reduced AWS costs through right-sizing and S3 lifecycle rules. Mentored and led a team (~6 engineers plus contractors/vendors

Developed full stack applications using React, Node.js, JavaScript and TypeScript. Designed and implemented secure REST APIs supporting payment processing and third-party system integrations. Built scalable cloud-native solutions utilizing AWS services and microservice architectures. Supported healthcare and enterprise platforms requiring strong security, compliance and data protection controls. Collaborated with business and technical stakeholders to plan integration strategies and migration initiatives. Performed troubleshooting, issue resolution and production support for customer-facing applications. Created technical documentation and knowledge transfer materials supporting successful project delivery. Participated in Agile development processes across distributed remote engineering teams.