Сергій Кушнеров
@0002426
React Frontend Engineer with 3+ years building high-performance web apps across Web3 and e-commerce.
LithuaniaWhat I'm looking for
I’m a React Frontend Engineer with 3+ years of experience delivering scalable, high-performance web applications across Web3, e-commerce, and enterprise proptech. I build responsive React/TypeScript UIs with strong state management and selective re-rendering, and I’ve driven measurable outcomes like 40%+ page load time reduction, 35% lower API overhead, and reusable component libraries used company-wide at JLL and ShipCheaper.
Currently, I’m building AI-powered crypto trading infrastructure at Botty, using Cursor AI and prompt engineering to accelerate delivery while improving code quality. I’ve also led core frontend development with Next.js and Redux, integrated GDPR-compliant APIs, and mentored junior developers at IT-Step Academy—bringing an engineering mindset focused on performance, maintainability, and rapid, collaborative execution.
Experience
Work history, roles, and key accomplishments
Frontend Mentor (IT-Step)
IT-Step Academy
Nov 2023 - Jul 2025 (1 year 8 months)
Mentored and taught Frontend Development (HTML, CSS, JavaScript, React), helping aspiring developers build real-world skills and industry best practices.
Refactored legacy React/TypeScript/Redux frontend into a modular codebase and delivered dashboards, property filters, map browsing, and reporting in a 15+ person Scrum team. Reduced production bug reports 28% and improved load speed 34% by introducing stricter unit testing standards and a Storybook-driven component library, cutting QA feedback loops by ~40%.
Education
Degrees, certifications, and relevant coursework
Sumy State University (SumDU)
Master's Degree, Software Engineering
Master's degree in Software Engineering at SumDU in Sumy, Ukraine.
IT-STEP Academy
Mentorship / Instructor (Part-time), Frontend Development
2023 - 2025
Part-time mentorship/instruction in frontend development, helping learners build real-world skills in HTML, CSS, JavaScript, and React.
Tech stack
Software and tools used professionally
GitHub
ESLint
PostgreSQL
MongoDB
Gmail
Node.js
Next.js
Tailwind CSS
Material-UI
Figma
Jira
styled-components
axios
Webpack
JavaScript
Apollo
GraphQL
Zustand
redux-saga
React Testing Library
Formik
Toolkit
MobX
React Router
Mantine
Playwright
TanStack Query
Cursor
Vite
Vitest
GitHub Copilot
Zod
TanStack Table
Framer Motion
Yup
Loops
React Hook Form
Remote
Redux Toolkit
Availability
Location
LithuaniaAuthorized to work in
Salary expectations
Job categories
Skills
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