# OLEG PROSKURIN
**Senior Full-Stack 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/)

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## Summary

Senior Full-Stack Engineer and Tech Lead with **9+ years** of production experience across **Frontend, Backend, Node.js, and Headless CMS / eCommerce** platforms, including **5+ years leading remote projects** for US, UK, EU, and AU clients. Built and ran the multi-tenant Tipico US backend on Sanity (75M+ requests/month, 5 publishing environments, white-label core + state architecture). Currently Tech Lead on PrimeUI ([primeui.com](https://primeui.com/), launched Feb 2026): a multi-surface platform spanning Studio web app, **public API, MCP server, CLI, and code-export pipeline**.

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## Skills

**Web & Full-Stack**: TypeScript, Node.js, Express, React, Next.js (App Router, SSR/SSG/ISR). TanStack Start/Router, Vite, Tailwind, shadcn-style design systems. Web performance and accessibility: Core Web Vitals, Lighthouse, WCAG

**Data & Infrastructure**: PostgreSQL, Drizzle ORM, Docker. GraphQL, WebSockets, REST APIs. Vercel, Cloudflare, Serverless & Edge functions

**Headless CMS & eCommerce**: Sanity, Storyblok, Contentful, Payload, Hygraph, DatoCMS. Shopify, Shopify Hydrogen, Crystallize, Stripe. Multi-tenant content modeling, multi-environment publishing, large-scale migrations

**LLM Integration**: multi-model routing across Claude / GPT / Gemini, schema validation and retry recovery, prompt caching, 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) is a multi-surface platform that turns a sitemap and product brief into production-ready websites. It spans a Studio web app, public API, MCP server, CLI, and code-export pipeline. Lead developer, owning ~70% of platform architecture across all surfaces.

- **End-to-end full-stack ownership across the platform**: Studio web app (TanStack Start, React, TypeScript), Node.js server runtime with PostgreSQL and Drizzle ORM, Dockerized staging and production deployment, public API, MCP server, CLI, code-export pipeline, and component registry.
- **Designed and shipped the code-export pipeline and CLI**: generates a production-ready Next.js project repo in ~45 sec and ~1.5 min end-to-end from UI Export to a running local project. The generated codebase is fully owned by the customer (no vendor lock-in) and shipped as a standard Next.js project.
- **Built and published MCP server**: 25 tools letting any external codebase connect to PrimeUI as a third-party integration; cross-host compatibility verified across 6 major coding environments (Claude Code, Cursor, Codex, others).
- **Cut client-wireframe turnaround at PixelPoint** from a week of Figma prototyping to a few hours: deployed responsive prototypes with production-level performance and dynamic interactions instead of static mockups.
- **Architected the generation layer with secure multi-provider LLM integration**: multi-model orchestration via Mastra + Vercel AI SDK (10 agents, 17 workflows), per-task routing across Claude / GPT / Gemini with auth and data handling for each provider, schema validation with retry recovery, prompt caching (73% Gemini context-cache hit rate), and WebSocket-based streaming of model responses to the UI.
- **Mentored the team on modern AI-augmented development workflow** from project start, including transition to Codex ahead of public release. Open-sourced two CLI tools built in the process (codex-bee, epic-loop).

### [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 multi-tenant Tipico US backend on Sanity Headless CMS**: 5 publishing environments, 3 datasets, white-label architecture for core + state teams. Production scale: 122 CMS users, **75M+ requests/month**, 98 document types, 165K+ stored documents.
- **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.
- **Built an LLM-based content translation pipeline**: JSON translation flow for 190 country-specific Storyblok pages, integrated into the publishing process and saving ~1 month of manual work.
- **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 and reviewed their architectural decisions.

### [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 between car owners and lessees.

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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/), [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/)

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## 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**).
- **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 that addresses 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).

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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
