Andrew Ostapchuk

Senior Frontend Engineer and Tech Lead with 8+ years of experience building and scaling React, Next.js and TypeScript applications across e-commerce, healthcare, ed-tech and fintech. Most recently led frontend architecture for 3 Scrum teams at Abto Software, delivering a shared React component library, NPM packages, Storybook and CI/CD pipelines used across 8 projects. Also builds production Web3 / DeFi systems in Rust and TypeScript: MEV and arbitrage bots, EVM simulation with revm, a self-hosted reth node, and a Next.js SaaS platform.

Strong in frontend architecture, design systems, monorepos, testing, performance and technical leadership. Open to fully remote senior React / tech lead contracts.

Founder & Independent Software Engineer (Web3, DeFi & SaaS) at Self-employed (2026-03 – Present)

• Built AllKit (allkit.co), a Next.js and TypeScript SaaS platform with 65 tools across 9 audience segments, a freemium model (Pro Pass, AI credits, API access) and SEO-driven acquisition.
• Built a mainnet MEV bot in Rust for Ethereum and L2s (Base, Avalanche) with local EVM simulation via revm, direct builder / sequencer connections, and focus on arbitrage and liquidations.
• Built a DEX-DEX arbitrage bot on a self-hosted reth node for sub-millisecond state access, mempool visibility and direct pool reads, removing third-party RPC dependency.
• Built CEX-CEX (Binance triangular and cross-pair) and CEX-DEX arbitrage bots: IOC limit orders over the WebSocket API, event-driven fill detection, slippage analysis, and two-sided inventory and risk management.
• Built YieldPing, a Next.js DeFi yield dashboard with real-time APR alerts, strategy simulation and a paper wallet for risk-free testing.

Tech Lead | Senior React Developer at Abto Software (2025-05 – 2026-02)

• Led frontend direction for 3 Scrum teams on the EDIO platform; improved delivery efficiency by 50% by architecting a custom React component library and CI/CD pipeline.
• Built and maintained NPM packages and Git submodules for shared frontend architecture supporting 8 React projects.
• Implemented a centralized Storybook and Vitest setup across 6 projects, improving UI consistency and increasing test coverage by 90%.
• Defined and enforced code style standards (ESLint, Prettier) and continuously improved developer experience across teams.

Senior Frontend Engineer at TGA Digital LTD (2023-09 – 2024-12)

• Shipped features for Craft Gin Club's Shopify Liquid and Vue.js e-commerce store, contributing to a 30% revenue increase in Q3 2023.
• Launched the EU version of Craft Gin Club, growing the international customer base by 15% in three months.
• Led the migration from Shopify Liquid and Vue.js to Next.js.
• Migrated BabyBuddy's healthcare app from Xamarin to React Native, improving UX and shipping new features.
• Refactored FlashAcademy's codebase into a scalable monorepo of UI components, improving CI pipelines and DX.

Frontend Engineer at One Logic Soft (2023-07 – 2023-10)

• Led development of an e-commerce store and admin panel from scratch with Next.js, Redux and Material UI, including i18n, canvas-based banner editing, and Google Maps polygon routing for delivery optimization.

Frontend Engineer at Binariks (2022-03 – 2023-01)

• Migrated the Kineko crypto casino platform from jQuery to Next.js, improving performance and UX; advised business owners on crypto product decisions.
• Extended the YourCoach Health platform with new features under tight deadlines.

Frontend Engineer at Starnavi (2020-06 – 2022-02)

• Architected a B2C contract sharing and e-signing platform in React from scratch, translating complex business logic into a scalable codebase.
• Built an internal time tracker and resource wiki, and a React Native mobile app supporting volunteer work for homeless animals.

Frontend Engineer at Docks (2019-10 – 2020-05)

• Led development of multiple e-commerce platforms in React and Vue.js, and a real-time esports platform for local Dota 2 competitions.

Frontend Engineer at Demigos (2018-03 – 2019-09)

• Took a UK-market freelancer platform from inception to production, then provided ongoing support and enhancements.

Bachelor's Degree in Computer Engineering – Uzhhorod National University (2014 – 2018)