# OLEG PROSKURIN
**Senior Full-Stack Engineer & Tech Lead**

Remote · GMT+7 (EMEA full overlap)

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/)

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## Summary

Senior Full-Stack Engineer and Tech Lead with 9 years of production experience, backend-focused on Node.js and TypeScript with a deep React / Next.js frontend foundation. 5 years leading remote client projects for US, UK, EU, and AU companies. Architected the Sanity-based backend for Tipico US running at 75M requests/month, and shipped fintech, eCommerce, and content platforms on Node.js, Next.js, and AWS. Currently Tech Lead on PrimeUI ([primeui.com](https://primeui.com/), launched Feb 2026): a multi-surface platform where I own the Node.js server runtime, public API, code-export pipeline, and AI generation layer.

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## Skills

**Backend & APIs**: Node.js, TypeScript. REST API design, GraphQL, WebSockets. PostgreSQL, Drizzle ORM, database modeling, schema validation, retry/recovery flows

**Cloud & Infrastructure**: AWS (S3, Dockerized deployments), Docker, Vercel, Cloudflare, serverless & edge functions. CI/CD: GitHub Actions, Bitbucket Pipelines

**Frontend**: React, Next.js (App Router, SSR/SSG/ISR), TanStack Start/Router, Remix, Tailwind, shadcn-style design systems. Core Web Vitals, Lighthouse, WCAG

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

**AI Engineering**: LLM orchestration: multi-model routing, prompt caching, schema validation. MCP server development; cross-host agent integration

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## Experience

### PixelPoint Ltd. — Tech Lead & Senior Full-Stack Engineer, PrimeUI
**Feb 2025 – Present** · France · Remote
PrimeUI ([primeui.com](https://primeui.com/), launched Feb 2026): a multi-surface platform that generates production-ready websites and ships customer-owned Next.js codebases. Lead developer, owning ~70% of platform architecture.
**Stack:** TypeScript, Node.js, React, TanStack Start/Router, Next.js, PostgreSQL, Drizzle ORM, Docker, Cloudflare (R2)

- **Owned the Node.js server runtime end-to-end**: generation orchestration, queue, public API, WebSocket-based streaming of model responses to the UI, JSON and schema validation with retry/recovery for LLM calls, and third-party API integrations.
- **Designed and shipped the code-export pipeline and CLI**: generates a production-ready Next.js project repo in ~45 sec, ~1.5 min end-to-end from UI Export to a running local project. The output is customer-owned, with no vendor lock-in.
- **Architected the AI generation layer**: multi-model orchestration via Mastra + Vercel AI SDK (10 agents, 17 workflows), per-task routing across Claude / GPT / Gemini, prompt caching reaching 73% Gemini context-cache hit rate.
- **Built and published the MCP server**: 25 tools letting any external codebase connect to PrimeUI from inside AI coding environments; cross-host compatibility verified across 6 major coding agents (Claude Code, Cursor, Codex, others).
- Set up staging and prod deployment on VPS with Docker container orchestration; object storage on Cloudflare R2 (S3-compatible API).
- **Built the Studio frontend** (TanStack Start, React, TypeScript): canvas-based sitemap, generation/preview/editing UI.

### FocusReactive — Senior Software Engineer & Tech Lead
**May 2019 – Feb 2025** (5 yrs 10 mos) · London · Remote
International web consultancy for clients in the US, UK, Europe, and Australia. Selected client projects:

- **Tipico US** — 3 yrs · *TypeScript, Node.js, Next.js, Sanity headless CMS.* Architected the Sanity-based backend running at 75M requests/month: 5 publishing environments, 3 datasets, white-label architecture for core and state teams, 122 CMS users, 165K stored documents.
- **MarketFinance** — 3 yrs · *TypeScript, Node.js, Next.js, Contentful, AWS (Dockerized deployment).* Built and maintained the fintech lending platform across frontend and Node.js backend services, deployed on AWS via Docker.
- **CasinoReviews** — 9 mos · *TypeScript, Node.js, React, Next.js, Storyblok headless CMS.* Full-stack build on Storyblok: content modeling, frontend, and backend integration.
- **Caleffy** — 6 mos · *TypeScript, Node.js, React, Remix, Shopify Hydrogen, Sanity, AWS (S3).* Migrated the store off Magento to a Hydrogen / Remix storefront with Sanity content; integrated PIM and ERP; used S3 for asset storage.

### GitNation — Senior Software Engineer (Part-time, concurrent)
**May 2019 – Feb 2025** · Remote · *Node.js, Slack API, headless CMS*
Built a publishing flow via Slack API and a reusable web framework for conference websites; migrated GitNation conferences to headless CMS.

### Osome — Frontend Developer
**Jun 2018 – May 2019** · Singapore · *React, JavaScript*
Built a fuzzy-logic search system and advanced UI animations for the corporate-services platform.

### Skipp — JavaScript Engineer
**Nov 2017 – Jun 2018** · Moscow · *JavaScript, GraphQL*
Built GraphQL-subscription real-time chat for a B2B marketplace (Skolkovo Innovation Center, 100+ companies integrated).

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## Portfolio

[PrimeUI](https://primeui.com/), [MarketFinance](https://focusreactive.com/marketfinance-case-study/), [Tipico Platform](https://focusreactive.com/sanity-platform-case-study/), [CasinoReviews](https://focusreactive.com/casino-reviews-case-study/), [Caleffy](https://www.caleffionline.it/), [NotSoApp](https://focusreactive.com/notsoape-case-study/), [Porchlight](https://focusreactive.com/porchlight-case-study/), [GitNation](https://github.com/GitNation/live-conferences), [Firsty](https://www.firsty.app/)

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## Open Source

- **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).

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## Education

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

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## Languages

English C1 · Russian native

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Remote setup: based in Thailand (GMT+7), Thai bank account.
