Founder & Full Stack Developer Xpar (Self Employed)
I design and deliver client products as a founder and full stack developer. For FTL, a FIFA 2026 trading game, I designed the architecture and cost estimates, led a team of three developers, ran sprints and demos, and supported more than 300 concurrent players during live matches.
I built event-driven REST APIs and Go WebSockets using Azure Service Bus and Redis Pub/Sub, reaching 17,924 operations per second. I reduced projected infrastructure costs by about 52% for 50,000 users by moving a serverless proof of concept to Dockerized microservices on Azure Container Apps. I also delivered a React, Vite, and Tailwind interface with 17 screens, OAuth 2.0, RBAC, and 104 Playwright end-to-end tests.
For Vistaholidays, a flight-booking product, I independently developed 72 REST APIs, 167 SQL migrations, and 138 stored procedures using React, Node.js, and Azure SQL. I implemented a three-tier wallet ledger with T-SQL row locks and unique request keys to prevent double debits and overselling, achieving over 99.9% success with 149 ms average latency across 48,654 requests and 708 automated tests.