Ivan

Ivan Khyzhniak - React Frontend Developer
LinkedIn | [відкрити контакти](див. вище в блоці «контактна інформація») | @Tr4be | [відкрити контакти](див. вище в блоці «контактна інформація») | Kyiv, Ukraine

Summary
• 5+ years of experience in domains such as AI/ML, FinTech, SportTech, and Entertainment.
• Worked in teams of 7 to 38 people using Agile methodologies (SCRUM and Kanban).
• Launched MVPs that attracted around ~$1M in investments and over 2M+ users.
• In my free time, I mentor people in front-end development.
Skills
• JavaScript (ES6+), React.js, Next.js, TypeScript, Redux Toolkit, MobX, Effector, Zustand, Reatom, Jotai, D3.js, Apollo Client/GraphQL;
• Tanstack/React-query, Tanstack/React-table, Tanstack/React-virtual, Tanstack/React-router, React-hook-form, Formik, Zod, Yup, Wouter;
• Tailwind, SCSS/SASS, Material UI, Mantine UI, ShadCn, Headless UI, Radix UI, Floating UI, Styled Components, Framer Motion, GSAP;
• Webpack, Vite, Jest, Vitest, React-testing-library, Storybook, Playwright, CI/CD, Docker, Axios, ESLint, Prettier, Docker, Node.js;
• Git (GitFlow), Jira, Asana, Agile, SCRUM, Kanban, SOLID, OOP, FLUX, FSD, SEO, Compound Components Pattern, Figma, English (B2);
Experience (5 years, 1 month)
React Frontend Developer Apiko 2yr 2mos, 02/2023 - Current
• Attracted 2M users and secured $917,821 in investments for a Telegram Mini Application by leading a team that successfully launched the MVP in
~2 months.
• Reduced deadline forecasts ~2x by designing and implementing a new architectural approach and migrating the application to a different tech stack.
• Improved user experience with forms by building a reusable form module with Zod validation, reducing repetitive work and ensuring consistency
across the application, and this module is used in 3 projects.
• Increased data loading speed by ~2.5x through the implementation of caching via a custom-built MobX library integrated with Tanstack/React-query.
• Reduced potential production errors by adding unit, integration, and screenshot tests to the CI/CD pipeline, while increasing test coverage from
38.55% to 87.10%.
• Improved mobile user experience by implementing native mobile animations using Framer Motion, which also increased average user session
duration by 17.81% on mobile devices.
React Frontend Developer Uptech 1yrs 7mos, 07/2021 - 02/2023
• Eliminated freezes during rendering of large datasets improving Time to Interactive (TTI) by 42.44% by implementing virtual scrolling.
• Reduced initial bundle size from 1.4 MB to 441 KB and improved load time by 3.2x through lazy loading (React.lazy, React.Suspense).
• Achieved an 18.31% reduction in server load by implementing a pagination system for data retrieval in tables.
• Reduced user payment errors by 4.11% by developing a payment form that highlights errors for users.
• Increased user engagement by 13.8% and optimized UX by implementing Amplitude for behavior analysis.
React Frontend Developer Cody Solutions 1yrs 4mos, 03/2020 - 07/2021
• Improved search ranking from page 14th to 3rd by optimizing content and implementing effective SEO strategies.
• Increased audience by 27.41% by localizing content into 22 languages via Crowdin and i18n, improving accessibility.
• Eliminated unnecessary re-renders and improved First Contentful Paint (FCP) by 12.7% by optimizing code with React memo hooks.
• Increased development speed of components by 2x through the creation of a Headless UI kit using the Compound Components Pattern.

Education
Software Engineering - Master's degree (121) Specialization in KNUTE Kyiv, Ukraine

Projects
• Online frame-to-video converter: Initiated and developed an application that automated the conversion of frames into videos with the required
codec, saving time for the design team and improving workflow efficiency.

Mentorship
• Mentored 3 junior developers: helped them grow into middle positions, and onboarded them into the project so they could handle tasks
independently.

Others
• Certificate of Animations On The Web: Taught by one of the top interactive designers in the world, Emil Kowalski, contributor to Framer Motion.
(6/2024)