# OLEG PROSKURIN
**Senior Node.js Backend Engineer & Tech Lead**

Remote · GMT+7 (EMEA full overlap, US East AM) · Deel contractor, W-8BEN

usulpro@gmail.com · Telegram @usulpro · [LinkedIn](https://www.linkedin.com/in/oleg-proskurin-76784453/) · [GitHub](https://github.com/UsulPro) · [Dev.to](https://dev.to/usulpro) · [Blog](https://focusreactive.com/blog/author/usulpro/)

---

## Summary

Senior Node.js / TypeScript backend engineer and Tech Lead with 9 years of production experience, currently leading the backend and AI generation layer of PrimeUI ([primeui.com](https://primeui.com/), launched Feb 2026): an AI-native code generation platform for professional websites that ships customer-owned Next.js projects. Designed and operated consumer-scale backends on PostgreSQL and the Sanity-based Tipico US platform (75M requests/month, 122 CMS users). Comfortable owning services end-to-end: REST API design, database modeling and optimization, performance tuning, third-party integrations, and AI/LLM orchestration as a first-class backend concern.

---

## Skills

**Backend & APIs**: TypeScript, Node.js, REST APIs, WebSockets, GraphQL. PostgreSQL, Drizzle ORM, SQL design and query optimization. Schema validation, retry/recovery, streaming responses. Public-API design for cross-host integrations (MCP server, CLI)

**AI Engineering**: LLM orchestration and guardrails on the backend: multi-model routing (Claude / GPT / Gemini), context engineering, prompt caching (73% Gemini context-cache hit rate), schema validation, retry recovery. Embeddings-based retrieval. MCP: custom server development; cross-host agent integration

**Commerce & CMS**: Shopify, Shopify Hydrogen, Crystallize, Stripe. Sanity, Storyblok, Contentful, Payload. Content modeling, multi-environment publishing, large-scale migrations

**Infrastructure & Delivery**: Docker, docker-compose. Vercel, Cloudflare, Serverless & Edge functions. CI/CD pipelines, NPM package publishing. Web performance: Core Web Vitals, Lighthouse, WCAG

**Full-Stack adjacent**: React, Next.js (App Router, SSR/SSG/ISR), TanStack Start/Router, Vite, Tailwind, shadcn-style design systems

---

## Experience

### PixelPoint Ltd. — Tech Lead & Senior Full-Stack Engineer, PrimeUI
**Feb 2025 – Present** · France · Remote

PrimeUI ([primeui.com](https://primeui.com/), launched Feb 2026) is an AI-native platform for generating production-ready websites, spanning Studio web app, public API, MCP server, CLI, and code-export pipeline. Sole full-time engineer on the project, owning roughly 70% of platform architecture across all surfaces.

- **Architected the AI generation layer on the Node.js backend**: multi-model orchestration via Mastra + Vercel AI SDK (10 agents, 17 workflows) with per-task routing across Claude, GPT, and Gemini; embeddings-based component retrieval over 1,555 chunks (OpenAI `text-embedding-3-small`) with three-tier fallback from exact key to family bucket to semantic search; prompt caching reaching 73% Gemini context-cache hit rate.
- **Public API, code-export pipeline, and CLI**: generates a production-ready Next.js project repo in ~45 seconds, ~1.5 minutes end-to-end from UI Export to a running local project. The generated codebase is customer-owned, shipped as a standard Next.js project, pre-configured for 8 selectable AI coding agents.
- **Built and published `@primeuicom/mcp` on NPM**: 25 tools that let any external codebase connect to PrimeUI from inside AI coding environments, with cross-host compatibility verified across 6 major coding agents (Claude Code, Cursor, Codex, others).
- **Owned the Node.js server runtime end-to-end**, including WebSocket-based streaming of model responses adapted to UI rendering, schema validation, retry and recovery flows for LLM calls, and third-party API integrations.
- **Drove team AI-tooling adoption**: Claude Code from project start, team transition to Codex ahead of public release. Open-sourced [codex-bee](https://github.com/usulpro/codex-bee) and [epic-loop](https://github.com/usulpro/epic-loop) as spinoffs.

### [FocusReactive](https://focusreactive.com) — Tech Lead & Senior Software Engineer
**May 2019 – Feb 2025** (5 yrs 10 mos) · London · Remote

International web consultancy for clients in the US, UK, Europe, and Australia.

- **Architected the Tipico US backend on Sanity Headless CMS at consumer scale**: 75M requests/month, 122 CMS users, 98 document types, 165K stored documents. 5 publishing environments, 3 datasets, white-label architecture for core + state teams.
- **Built a Claude-based content automation pipeline**: JSON translation flow for 190 country-specific Storyblok pages, integrated into publishing and saving ~1 month of manual work.
- **Led migration of 15 client projects to Headless CMS and commerce platforms** (Sanity, Storyblok, Contentful, Payload, Crystallize, Shopify, Hydrogen), restructuring content models and cutting update cycles from weeks to days.
- **Designed and built CMS-KIT**, an open-source Headless CMS starter and component library used across 15 client projects, cutting kickoff from days to hours and accelerating development by ~30%.
- **Led technical hiring and team development**: designed an assessment mirroring real working conditions, ran 30 interviews leading to 8 hires, mentored new engineers; drove team adoption of Claude.ai for research, content, and codebase analysis from 2024 onwards.

### [GitNation](https://github.com/GitNation/live-conferences) — Senior Software Engineer (Part-time, concurrent)
**May 2019 – Feb 2025** · Remote
Built publishing flow via Slack API and a reusable web framework for conference websites; migrated GitNation conferences to Headless CMS.

### [Osome](https://osome.com/sg/) — Frontend Developer
**Jun 2018 – May 2019** · Singapore
Built fuzzy-logic search system and advanced UI animations for the corporate-services platform.

### [Skipp](https://www.skipp.dev) — JavaScript Engineer
**Nov 2017 – Jun 2018** · Moscow
B2B marketplace for Skolkovo Innovation Center (100 companies); GraphQL subscriptions for real-time chat.

---

## Portfolio

[PrimeUI](https://primeui.com/), [MarketFinance](https://focusreactive.com/marketfinance-case-study/), [Tipico-Platform](https://focusreactive.com/sanity-platform-case-study/), [IWM membership](https://www.iwm.org.uk/membership#membershipModal), [NotSoApp](https://focusreactive.com/notsoape-case-study/), [CasinoReviews](https://focusreactive.com/casino-reviews-case-study/), [VegasSlotsOnLine](https://www.vegasslotsonline.com/), [Caleffy](https://www.caleffionline.it/), [Hadhat](https://focusreactive.com/hardhat-case-study/), [Porchlight](https://focusreactive.com/porchlight-case-study/), [Gitnation](https://github.com/GitNation/live-conferences), [FocusReactive blog](https://focusreactive.com/blog/), [Skolkovo R&D Market](https://rnd.sk.ru/lk/main), [Reverse Health](https://join.reverse.health/tour/nutrition-monthly-generic-others), [Firsty](https://www.firsty.app/)

---

## Open Source & Writing

- **Storybook**: contributor and steering team member during the 2016–2017 community revival; addon maintainer (storybook-addon-console, **7M NPM downloads**; storybook-addon-material-ui, **18K weekly**).
- **AI developer tooling**: [codex-bee](https://github.com/usulpro/codex-bee), a wrapper for long-running Codex sessions; [epic-loop](https://github.com/usulpro/epic-loop), a Codex skill solving context degradation in long autonomous coding sessions via techlead/engineer role separation and durable epic state.
- **Technical writing**: articles on frontend, Headless CMS, and developer tooling at [FocusReactive blog](https://focusreactive.com/blog/author/usulpro/) and [Dev.to](https://dev.to/usulpro).

---

## Education

**Master in Engineering**, Faculty of Electronic Engineering, Moscow Power Engineering University ([MPEI](https://mpei.ru/lang/en/Pages/default.aspx)), Russia

---

## Languages

English C1 · Russian native
