J Ξ F Ξ R S O N User

At Granular IT, I architected a dental practice management system from scratch, from its PostgreSQL domain model and Supabase Row-Level Security to its React Router and NestJS services. It includes clinical records, appointment scheduling, tooth charting, and invoicing built for Kenya Revenue Authority eTIMS fiscalization.

For retail clients, I’m leading integration work across a SAP Business One to ERPNext migration, preserving the existing mobile app’s data contract. I’ve also designed payment integrations that bring providers such as Peach Payments, iPay, Paystack, and M-Pesa into client systems.

I run self-hosted Docker and Coolify infrastructure on Hetzner Linux servers, supporting production workloads across multiple client domains. I’ve resolved deployment, routing, and TLS issues, and tuned Supabase and PostgreSQL performance through indexing and query analysis.

I’ve also built React Native and web applications, and developed a Go match-intelligence pipeline for the Microsoft x Premier League Inside the Game Hackathon. I’m open to full-time and contract roles.