Backend-focused software engineer who owns complex, data-intensive systems end-to-end - from architecture and design through production operations. At Eightgen AI, led a multi-currency capability across 10 Python/FastAPI microservices and hardened a multi-tenant platform with strict data isolation, RBAC, and defense-in-depth authorization. At Wassha Inc. (Japan), independently owned a Django + Node.js platform, drove a 40% response-time gain, cut production incidents 3×, and mentored 6 engineers. Deep across microservices, event-driven architecture, CI/CD, and automated testing, with a consistent record of measurable reliability, security, and performance gains in async-first, globally distributed remote teams.