Антон

[open contact info](look above in the "contact info" section)
Anton Sementsov [open contact info](look above in the "contact info" section)
Kyiv, Ukraine
Senior Software Engineer LinkedIn

Experienced Senior Frontend Engineer with 7+ years of experience designing,
building, and shipping SaaS products from zero to production. Skilled in TypeScript,
React ecosystem, frontend architecture, and AI-integrated web applications.
Passionate about product thinking, clean architecture, and solving complex UI and
business logic challenges at scale.​
Current interests include AI-powered tooling and building high-quality developer
experiences.
SKILLS
PROFESSIONAL EXPERIENCE
● Core Stack
TypeScript, JavaScript Senior Software Engineer Mar 2023 - Apr 2026
React, Next.js, Node.js
Merge.Rocks Kyiv, Ukraine · Outsource / Product
● UI & Design Systems Products: Capable (AI prompt chains) · Agentless (real-estate AI docs) · Forwardlane
Tailwind CSS, Shadcn, Radix (fintech) · Oleria (security)
UI, Chakra UI, Storybook,
GSAP ●​ Led frontend architecture end-to-end across 3 SaaS MVPs simultaneously -
owning every product decision from database schema and auth design to
● State & Data
deployment pipelines, and mentoring 1-2 frontend developers on several of the
Redux Toolkit, Zustand, MobX
products.
React Query, RTK Query, SWR
●​ Built Forwardlane's core product differentiator: a visual, node-based financial
● AI & Automation
signal query builder using ReactFlow, with drag-and-drop graph editing, custom
Claude Code, Cursor,
AI agents, MCP
node/edge types, and fully serialisable query state - a category of UI most
n8n, Make, Webhooks developers never encounter.

● Backend & Databases
●​ Integrated Stripe Billing across 2 products: subscription tiers, proration,
Supabase, PostgreSQL webhook-driven access control tied to Supabase RLS policies, intent, per seats
Strapi, Sanity and one-time payment flows.
● DevOps & CI/CD ●​ Built a configuration-driven form engine for Agentless that decoupled complex
Vercel, GitHub Actions, form flows from code - product and design could define new multi-step forms
Docker via JSON schema (conditional fields, nested sections, Zod validation) without
touching the codebase, turning what was a multi-day engineering cycle into a
● Analytics & Payments
Stripe, PostHog, GTM,
same-day config change.
HubSpot, Sentry ●​ Architected an AI-powered document pipeline for Agentless: users upload home
● Testing inspection PDFs - OpenAI, Antropic extracts structured issues - system
Testing Library, Cypress, auto-generates legal disclosure documents via API2PDF/DocuPilot, automating a
MSW, Sinon workflow that previously required hours of manual attorney work.
●​ Built Capable's prompt-template editor using Slate.js with variable syntax
highlighting, inline custom popups, and LangChain prompt chain execution - so
EDUCATION non-technical users could author, test, and iterate AI prompts without writing
KNTU code.
Kirovohrad National ●​ Designed no-code automation workflows in n8n and Make that connected
Technical University
Supabase webhooks, OpenAI, Claude, and third-party APIs - delivering
Software development -
Master's degree
AI-enriched email and Slack notifications on user events with zero custom
server infrastructure.
LANGUAGES ●​ Instrumented full observability across 2 products: PostHog funnel analytics,
Ukrainian - Native GTM event tracking, HubSpot attribution, and Sentry error monitoring - giving
English - Advanced founders live product insight from launch day.

Front-end Developer May 2022 - Feb 2023
Awesomic San Francisco, CA (Remote) · Y-Combinator · Forbes UA 30u30
●​ Shipped one of the earliest production integrations of OpenAI GPT in a B2B
product (2022): an AI-powered messaging layer that generated contextual
 suggestions to help clients articulate design briefs, reducing back-and-forth
revision cycles.
●​ Added real-time collaborative cursors and co-editing to the platform using
Snippyly SDK - turning async design reviews into synchronous sessions, a feature
almost no other design marketplace had at the time.
●​ Rebuilt the client/designer data dashboard with React Table to support complex
multi-column filtering, sorting, and inline editing at scale - replacing a brittle
custom implementation that broke under dataset growth.

Front-end DeveloperAug 2021 - May 2022
AgenaTech Stockholm, Sweden (Remote)
4 simultaneous client verticals: e-commerce, social, healthcare, legal
●​ Make GraphQL adoption across the entire product suite - replacing
over-fetching REST patterns with schema-first queries, reducing payload sizes
and eliminating large chunks of front-end data-transformation code.
●​ Implemented full i18n with locale-aware routing across 2 products supporting
multiple languages, abstracting all translation logic into shared hooks so
component code stayed clean and language-agnostic.

Front-end DeveloperMar 2021 - Aug 2021
Rocque Kyiv, Ukraine
Projects: CRM for youth psychology (Teenergizer) · ERP for post service
●​ Built a WebSocket-based real-time chat with typing indicators, read receipts,
and persistent message history for a youth-psychology CRM - the first async
communication channel the platform had, replacing manual email coordination.
●​ Engineered the Stripe membership and payment module with role-based access
control and a full admin panel for managing subscriptions - the feature that
enabled the platform's revenue model.
●​ Integrated a real-time notification system (WebSocket) with per-user preference
controls, supporting both in-app and email delivery - increasing therapist
response time to new session requests.

Full-Stack / Front-end DeveloperAug 2018 - Mar 2020
Onix Systems Kirovograd, Ukraine
Projects: Global print solutions platform · CRM for real estate (ROI Genius)
●​ Delivered CRM features full-stack - React/Redux on the front-end,
PHP/CodeIgniter on the back-end - owning the entire feature vertical
independently, which accelerated delivery without waiting on back-end
handoffs.
●​ Performed a visual redesign of a global print solutions platform including widget
integration and cross-browser fixes - marking the transition from full-stack to
dedicated front-end specialisation.