Rafał Bagrowski
From: Poland
Location: Warszawa
On Useme since 23 October 2025
About me
Senior Full-Stack Developer | React, Next.js, Node.js | AI Agents
I build and extend SaaS products and AI workflows, from interfaces and APIs to deployment and production support.
At Zync, I lead engineering across five AI/video product areas. Rendering work I led reduced rendering costs by 90%. Content workflows we shipped saved 2–3 hours of manual post-production per video.
I can help with SaaS/MVP development, API and payment integrations, AI agents with tools and approval steps, and video automation.
Examples: Pixsprint, a creator media-kit app I built from interface to backend; Support Agent Desk, an experimental Python/FastAPI project with specialist handoffs, typed tools and local evaluations.
Stack: React, Next.js, TypeScript, Node.js, Python, OpenAI/Anthropic APIs, GCP and Azure.
Open to remote senior full-stack work and ongoing product collaboration. Message me on Useme with your product, stack and the problem you need solved.
Categories
CV / Résumé
Apr 2022 - Now
Lead Fullstack Engineer
Zync AI
Lead engineering across five AI/video product areas: UI, APIs, billing and cloud. Rendering work reduced costs by 90%; shipped content workflows saved 2–3 hours per video. React, Node.js, Python, GCP/Azure. Mentored five engineers.
Jun 2021 - May 2022
Senior Front-End Developer
Fast White Cat
Built React/TypeScript storefronts for 4F and EZ Living Furniture: checkout, payments, shipping, cart and catalog. The storefront portfolio served 5M+ monthly users. GraphQL, Magento PWA Studio, tests and performance.
Oct 2019 - May 2021
Senior Software Engineer
GFT Group
Built web and mobile applications for financial-services clients with React, React Native, Node.js, TypeScript, GraphQL/Apollo and Prisma. Delivered features, integrations, reusable components and Cypress/Jest tests.
Portfolio
I lead engineering across five AI/video product areas: UI, APIs, billing and cloud. Rendering work reduced costs by 90%; content workflows saved 2–3 hours per video. React, Node.js, Python, GCP/Azure. Public product website shown.
Experimental Python/FastAPI project: specialist handoffs, typed tools, retrieval and human approval of mock refunds. Local evaluations and optional OpenAI Agents SDK runtime. Actual demo UI; not a client production deployment.
At Fast White Cat, I built React/TypeScript checkout, payments, shipping and catalog features. The storefront portfolio served 5M+ monthly users. GraphQL, Magento PWA Studio, tests and performance. Public storefront capture.
Marketing website built with Next.js and Tailwind to showcase a SaaS studio demo, including localized copy, Sanity-powered CMS integration, and polished UI components tailored for portfolio presentations.
I built this creator media-kit app from interface to backend: work samples, audience stats, public/private media kits and brand-interest tracking. React and Node.js. Actual product dashboard shown.
Next.js/PostgreSQL demo: CSV import, explainable lead scoring and a Claude analyst with typed tools. Synthetic data. Approvals record recommendations without changing ad accounts. Actual demo screenshots shown.
Full-stack product designer & Next.js developer. Designed and built a premium responsive website for an executive workation service: landing page, packages, brief form, Next.js, Tailwind and GSAP.
A bilingual Next.js SaaS landing template showcasing polished marketing pages, auth flows, and localized copy. Built with TypeScript, Tailwind CSS, and next-intl, it’s ready to swap in your own branding, content, and integrations.