A selection, not everything I have shipped. Case studies from fintech and enterprise platforms first, then earlier client projects, each picked because the outcome is measurable. Happy to walk through the rest.
7 selected case studies, 5 earlier projects
Download CVDownload CVDesigned a peer-to-peer QR payment system on the EMV standard, and led delivery of Request to Pay across the mobile app and USSD.
Built with.NET, Microservices, EMV QR and TLV encoding
Read case studyBuilt a scheduler that dispatches 700-800k push notifications per run in 6-8 minutes, with multilingual payloads for Android and Huawei devices.
Built with.NET, Schedulers, Android push and HMS Push
Read case studyLed development of enterprise agent apps serving 60,000+ agents for telecom operators in Tanzania and Togo, and removed the Redis bottleneck that threatened peak traffic.
Built with.NET 8, Microservices and Redis
Read case studyIntegrated the OTAPP bus ticketing service into the Mixx Tanzania super app, so booking a seat and paying for it never leaves the wallet.
Built with.NET, Microservices and Third-party APIs
Read case studyBuilt the qualification certificate issuance workflow end to end: payment, reviewer assignment, approval, and role-based access.
Built with.NET 9, ABP.io, Angular and DDD
Read case studyBuilt a caching aggregation layer in front of five downstream services, and shipped analytics dashboards for the Online Travel Agency and Admin portals.
Built with.NET 9, ABP.io, Response caching and Angular
Read case studyBuilt a batch validation scheduler that detects errors before bulk corporate payments are processed, reducing processing errors by 30%.
Built with.NET, Schedulers and Microservices
Read case studyProducts I built for clients before moving into fintech full time, most of them still live.
An AI assistant that puts ChatGPT, DALL-E, and Llama 3 in one place. I built the responsive React frontend, with drag-and-drop chat management and saved prompts.
Built withReact, ChatGPT API, DALL-E and Llama 3
Visit app.chadgpt.comA Dubai property platform where people explore, add, and view listings. I completed it end to end, including listing uploads and the admin approval flow.
Built withReact and .NET Core APIs
Visit unitflix.comInsurance for watches, jewelry, and bags. Risk is scored during onboarding, and high-risk requests are routed to an admin for verification.
Built withMongoDB, Express, React, Node.js, Stripe and PassportJS
No public link, the client owns this oneA responsive MERN website with an admin panel for images, videos, and blog content, published in English and German.
Built withMongoDB, Express, React and Node.js
Visit photonbrains.comA reusable React component set (forms, modals, tables) for a payment gateway platform, built with a two-person design team so screens could be assembled instead of rewritten.
Built withReact, TypeScript, Bootstrap and Sass
No public link, the client owns this oneOpen to full stack & backend roles, and to scoped freelance work.