Production backend systems across multiple internal products and platforms.

• Built a swap backend handling concurrent transactions with consistency guarantees and idempotent processing.
• Extended scope into a multi-tenant food-delivery SaaS: NestJS backend, license / subscription API, and admin tooling for branded storefronts.
• Optimized hot-path database queries, dropping response times from ~17s to ~200ms and CPU usage from ~60% to ~12%.
• Built a multi-chain wallet / payment tracker (ETH and BSC, native + ERC-20) with provider fallback, canonical deduplication, and per-project failure isolation.
• Integrated external payment providers with idempotent webhook callback handling and HMAC-signed delivery.
• Deployed services on AWS (EC2, Aurora) with secrets-manager-backed payout flow and mainnet smoke tests.

Led backend architecture and team coordination for Telegram mini-app games supporting 100,000+ users.

• Designed a multi-bot architecture (main bot + sibling bots + admin panel) with shared JWT auth and MongoDB-backed grammY storage.
• Built Hono services for Telegram webhook handling alongside the main Fastify + Prisma backend.
• Integrated Telegram Mini Apps with initData verification, S3 asset storage, and Elasticsearch-backed search.
• Built admin dashboards on Nuxt 3 + NuxtHub (Cloudflare Workers) with Pinia and ApexCharts for moderation, analytics, and in-game economy.
• Designed APIs and background jobs with RabbitMQ for async processing; tuned concurrency across MongoDB and Prisma.

Backend services and frontend tooling for Telegram mini-app game systems.

• Built backend services and APIs for game systems on a Telegram mini-app platform.
• Implemented Telegram bot logic with grammY and webhook handling on Hono.
• Contributed to internal panels and tooling on Vue / Nuxt for game operations.

Vue / Nuxt web apps and Web3 product work.

• Built Vue / Nuxt web apps with Node.js, Tailwind, and Git workflows.
• Built the frontend for a Web3 NFT app with staking, NFT generation, and sales.
• Contributed to a real-estate Web3 project with NFTs for building rentals and admin panel.

Ongoing freelance availability for backend / full-stack contract work alongside core role.

• Open to backend / full-stack contracts in parallel with main employment.
• Past projects span React / Next.js and Vue / Nuxt frontends with Node.js backends.