Usman K

Full Stack AI Developer

Upwork • Freiberufler

Mar 2024 - Present • 2 yrs 7 mos

Full Stack Developer with 7+ years building production SaaS platforms, AI-powered products, and mobile apps for clients worldwide. What I can build for you: - SaaS platforms with auth, dashboards, and Stripe payments - AI integrations using OpenAI, Claude, RAG pipelines, and voice AI - Real-time apps with live data syncing and WebSockets - iOS and Android mobile apps with React Native - Shopify stores and WordPress sites with custom backends My stack: React, Next.js, TypeScript, Node.js, Supabase, PostgreSQL, MongoDB, AWS, Vercel, Stripe, VAPI, and Claude Code daily. I have shipped production products serving 500K+ users, handling billions in transactions, and processing 1M+ monthly AI interactions across healthcare, fintech, edtech, and sports industries. Clean code, clear communication, and on-time delivery every time. Message me and let us build something great.

Team Lead - Full Stack Developer

Cyara • Vollzeit

Feb 2021 - Mar 2023 • 2 yrs 1 mo

- Led a team of developers in Full-Stack Development of enterprise web applications using React, Next.js, Node.js, JavaScript, and TypeScript. - Designed and developed responsive UI components using HTML, CSS, and Tailwind CSS. - Built scalable backend services with Node.js and Express.js, and managed data with MongoDB. - Implemented API Integration and created custom APIs for seamless communication between services. - Deployed and managed cloud-native features using AWS Lambda and Microsoft Azure. - Integrated WebRTC for real-time communication and Stripe for secure payment processing. - Contributed to the development and scaling of Cyara’s customer experience testing web application. - Oversaw architecture decisions, code quality, and task planning as team lead.

Full Stack Web Developer

Kairos Business Solution • Vollzeit

Dec 2020 - Dec 2021 • 1 yr

- Worked on end-to-end Full-Stack Development of modern web applications using Next.js, React, Node.js, JavaScript, and TypeScript. - Built responsive and accessible UIs using HTML, CSS, and Tailwind CSS. - Developed robust backend APIs with Node.js and Express.js, and handled data with MongoDB and Supabase. - Integrated third-party services via API Integration and built custom APIs for client-specific needs. - Used Stripe for secure payment processing and handled full transaction workflows. - Collaborated with cross-functional teams including designers and project managers to deliver tailored solutions. - Followed best practices in web development, performance optimization, and secure deployment.