At Freelance / Outsourcing, I built CozzySIM’s eSIM marketplace purchase flow in a Telegram Mini App, from package search and checkout to eSIM activation. I also integrated an external provider API and built its admin platform.
For the Crash Game, I designed a three-service architecture and implemented a server-authoritative WebSocket game loop with latency compensation. I integrated TON, TonAPI, Telegram Stars and referrals.
I’ve also built a multi-tenant e-commerce SaaS with Stripe, Bitcoin and Web3 checkout, and an offline-first warehouse and delivery app with local order persistence and automatic sync. My work spans backend architecture, integrations, deployment and production support.
