Projects

A Korean knowledge-sharing community serving five languages — I built its AI assistant end to end: SSE token streaming, multi-turn memory, per-turn language matching, voice input and the quota architecture that keeps LLM cost predictable.

An AI ad-creative SaaS for a US client — three AI providers behind automatic failover, Stripe credit billing, and Meta/Shopify integrations, built end to end by one engineer.

A full five-surface food-delivery platform for Uzbekistan — a NestJS/Prisma backend with a real-time order engine, a Next.js web app, and three native Expo apps (customer, courier, restaurant) — architected end to end as founder and lead engineer.

An AI voice-bookkeeping platform that turns spoken Uzbek/Russian market chatter into structured accounting entries — across a NestJS GraphQL backend, a Telegram bot, and an Expo iOS/Android app.

A production brand platform for REJUAGE, a Seoul-based premium skincare company: a tri-lingual (EN/KO/RU) React storefront where every landing-page section is editable by the owner through a custom admin CMS, backed by an Express 5 + MongoDB API and deployed on a self-managed DigitalOcean droplet behind Caddy and Docker Compose. Live at rejuageglobal.com.

Redesigned and shipped both storefronts for PEARLYjams, a Korean family matching-sleepwear brand — a USD global store and a bilingual KO/EN Korean store — across four contracted phases, all delivered live between 21 July and 14 August 2026. Every theme change was deployed through the Shopify admin API, because the client's least-privilege collaborator scope would not open the theme code editor.

Built the in-house LLM stack for a Korean Q&A platform: a fine-tuned Qwen3-8B classifier that beats gpt-4o 73.1% to 44.0% on the same 2,821-example holdout at p95 678ms and $0 per call, plus a streaming KO/EN/RU/UZ chat product (FastAPI + SSE, Next.js client) running entirely on company-owned hardware.

A production NestJS backend that turns raw product photos into on-brand ad creatives and studio packshots, orchestrating Claude, Gemini and Vertex Imagen behind Redis-backed BullMQ queues.

A full-stack real-estate marketplace where users browse and like listings, agents publish properties, and admins moderate — a NestJS GraphQL API with MongoDB aggregation, scheduled ranking jobs, and real-time chat behind a multilingual Next.js front end.

An online IT-education and bootcamp platform — FullStack, DevOps, AI Engineering, Agentic and Vibe-Coding tracks — delivered through a web app and a cross-platform Flutter mobile client.

A Korean word-chain (끝말잇기) duel played on a chess clock: Android client, authoritative Ktor WebSocket server on Azure, and a build-time pipeline that turns 1.7M National Institute of Korean Language entries into a 429,137-word playable dictionary. Shipped to Google Play internal testing as a signed AAB, with 1,233 tests and 12 architecture invariants enforced by the build.