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Anton Sementsov

@antonsementsov1

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Full stack developer React Node, 7+ years of experience 🍃 Client-oriented tech partner

Ukraine

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What I'm looking for

I'm interested in Full Stack React Node & AI-powered tooling and building high-quality developer experiences.

A FEW FACTS ABOUT ME:

⏱️ 7+ years of experience

🚀 20+ end-to-end projects delivered

🧩 10+ SaaS products shipped to production

🏆 Worked at a Y Combinator startup recognized in Forbes Ukraine 30 Under 30

🧱 Clean architecture, documented code

Senior full-stack engineer building SaaS products from zero to production, mostly in TypeScript, React and Next.js, with Node, Postgres and Supabase on the backend. I like owning features end to end: architecture, UI, payments, integrations and shipping.

Recently at ET AL, a B2B apparel platform, I owned 3 apps (storefront, API, admin). I built an AI virtual try-on with Google Gemini, a multi-step product configurator, a Stripe quote-to-cash flow and auth on Better Auth. I also set up a spec-driven AI development workflows on each stage of code production.

Before that, at Merge.Rocks, I led frontend architecture on 4 SaaS MVPs in AI, fintech and proptech and mentored other frontend devs. Highlights: a visual workflow builder on React Flow, a JSON-schema form engine that cut new flows from 2 weeks to 2-3 days, and Stripe billing with webhook-driven access. Earlier, at Awesomic, I shipped one of the earliest production GPT integrations in 2022

I'm interested in AI-powered products, developer experience and fast-moving product teams. Based in Kyiv, working remotely.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

et-al

Jun 2026 - Sep 2026 (3 months)

● Took end-to-end ownership of the customer-facing platform across 3 apps (storefront, API, admin backoffice), driving features to production - authentication, product configuration, payments, AI try-on and internal ops tooling.
● Set up a spec-driven AI development harness on Claude Code: mapped the existing codebase into structured architecture, conventions and risk docs.

Senior Full Stack Engineer

Merge.Rocks

Mar 2023 - Apr 2026 (3 years 1 month)

Led frontend architecture across multiple SaaS MVPs, built a node-based financial query builder, integrated Stripe Billing, and architected AI-powered document pipelines.

Senior Full Stack Developer

Awesomic

May 2022 - Feb 2023 (9 months)

Shipped early production integration of OpenAI GPT in a B2B product, added real-time collaborative cursors, and rebuilt the client/designer data dashboard with React Table.

React OpenAI GPTs Snippyly SDK React Table Next.js React Query React Hooks TypeScript NodeJS SQL Firebase React Typescript Javascript Typescript JavaScript CSS CSS Modules CSS in JS Tailwind REST APIs Responsive Design

Front-end Developer

AgenaTech

Aug 2021 - May 2022 (9 months)

Implemented GraphQL adoption across the product suite and full i18n with locale-aware routing across multiple products.

GraphQL i18n React

Front-end Developer

Rocque

Mar 2021 - Aug 2021 (5 months)

Built a WebSocket-based real-time chat, engineered a Stripe membership module, and integrated a real-time notification system for a youth-psychology CRM.

WebSockets Stripe React Real time Notifications