Андрій

ANDREW OSTAPCHUK
Tech Lead · Frontend Engineering · React & Redux Specialist · Web3 / DeFi Builder
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · Uzhhorod,
Ukraine

SUMMARY
Tech lead and frontend architect with 7+ years scaling React and Next.js platforms across e-commerce,
healthcare, and ed-tech — most recently leading 3 scrum teams at Abto Software. In parallel, ships independent
DeFi and MEV products in Rust and TypeScript: latency-sensitive arbitrage bots across CEX, CEX-DEX, and
DEX-DEX venues (powered by a self-hosted reth node), a mainnet MEV bot with revm simulation, a DeFi yield
dashboard, and a freemium SaaS tool suite. Comfortable owning architecture end-to-end and turning ambiguous
problems into shipped systems.

SHIPPED PROJECTS
• AllKit Free SaaS tool suite at allkit.co — 65 utilities across 9 audience segments, freemium model (Pro Pass,
AI credits, API access), built for organic SEO acquisition. Next.js · TypeScript.
• Mainnet MEV Bot MEV bot for EVM mainnets and L2s (Base, Avalanche). Local EVM simulation via revm,
direct builder/sequencer connections, focused on L2 arbitrage and liquidations. Rust · revm.
• CEX-CEX Arbitrage Bot Triangular and cross-pair arbitrage bot on Binance. IOC LIMIT orders over the
WebSocket API with event-driven fill detection, topology filtering, and slippage analysis on cross-pair legs.
Binance WS API · low-latency.
• CEX-DEX Arbitrage Bot Cross-venue arbitrage between centralized exchanges and on-chain DEXes.
Latency-aware execution path, two-sided inventory management, asymmetric risk handling between venues.
• DEX-DEX Arbitrage Bot Pure on-chain arbitrage powered by a self-hosted reth node for sub-millisecond
state access, mempool visibility, and direct pool reads — eliminating third-party RPC dependency. Rust ·
reth.
• YieldPing DeFi yield aggregator and dashboard with real-time APR change alerts, strategy simulation, and a
paper wallet for risk-free position testing. Next.js · web3.

EXPERIENCE

Tech Lead | Senior React Developer — Abto Software
05/2025 – 02/2026 · Ukraine
• Led front-end direction of 3 scrum teams, improving delivery efficiency by 50% at EDIO by architecting a
custom React component library and CI/CD pipeline.
• Developed and maintained NPM packages and git submodules for front-end architecture, supporting 8 React
projects at EDIO.
• Implemented centralized Storybook and Vitest engine, increasing UI consistency and test coverage by 90%
across 6 projects.
• Enforced code style standards and improved developer experience through continuous improvements.

Senior Frontend Engineer — TGA Digital LTD
09/2023 – 12/2024 · Ukraine
• Shipped features for Craft Gin Club's Shopify Liquid + Vue.js e-commerce store, contributing to a 30%
revenue increase in Q3 2023.
• Launched the EU version of Craft Gin Club, expanding the international customer base by 15% in three
months.
• Led the migration from Shopify Liquid + Vue.js to Next.js.
• Transitioned BabyBuddy's healthcare app from Xamarin to React Native, improving UX and adding new
features.
• Refactored FlashAcademy's codebase into a cleaner, scalable monorepo of UI components — improving
pipeline processes and DX while shipping new features.

Frontend Engineer — One Logic Soft
07/2023 – 10/2023 · Ukraine
• Led development of an e-commerce store and admin panel from scratch (Next.js + Redux + Material UI), with
i18n, canvas-based banner editing, and Google Maps polygon routing for delivery optimization.

Frontend Engineer — Binariks
03/2022 – 01/2023 · Ukraine
• Migrated the Kineko crypto casino platform from jQuery to Next.js, modernizing performance and UX; advised
business owners on crypto product decisions.
• Extended the YourCoach Health platform with new features under tight deadlines.

Frontend Engineer — Starnavi
06/2020 – 02/2022 · Ukraine
• Architected a B2C contract sharing and signing platform from scratch — scalable codebase, full business-
logic translation.
• Built an internal time tracker + resource wiki, and a React Native mobile app supporting volunteering efforts
for homeless animals.

Frontend Engineer — Docks
10/2019 – 05/2020 · Ukraine
• Led development of multiple e-commerce platforms (React, Vue) and a real-time e-sport platform for local
Dota 2 competitions.

Frontend Engineer — Demigos
03/2018 – 09/2019 · Ukraine
• Took a UK-market freelancer platform from inception to production, then provided ongoing support and
enhancements.

SKILLS
Languages: TypeScript, JavaScript (ES6+), C#, HTML5, CSS3, SASS/SCSS, Razor, Liquid
Frontend: React, React Hooks, Redux, Redux Toolkit, Redux Thunk, Redux Saga, MobX, Next.js, Vue.js, React
Native, Xamarin
UI & Styling: Tailwind, styled-components, Material UI, Shadcn, Bootstrap, Chart.js, Responsive & Adaptive
Design
Tooling: Vite, Webpack, Rollup, Babel, ESLint, Prettier, Turborepo, NX, Monorepo, Git submodules, Micro-
packages, CI/CD
Testing: Vitest, Jest, React Testing Library, Storybook, Debugging
Backend / APIs: REST API, WebSockets, Socket.io, Axios
Web3 / Crypto: Solidity-adjacent tooling, reth, revm, ccxt, Binance APIs, on-chain DeFi, MEV, EVM simulation
Process: Agile, Scrum, Custom architecture, UI/UX, SPA

LANGUAGES
English: Proficient Ukrainian: Native

EDUCATION
Bachelor's degree, Computer Engineering
Uzhhorod National University · 2014 – 2018