Olha

OLHA PARFENIUK
Frontend Developer
Kyiv, Ukraine • [open contact info](look above in the "contact info" section) • [open contact info](look above in the "contact info" section) • Linkedin

SUMMARY
Frontend developer with over 5 years of experience building high-load Sportsbook and B2B products.
I design and develop scalable frontend solutions using React, Next.js and TypeScript. In my work, I focus on
clean architecture, high performance and code stability.
I value transparent processes, shared responsibility and a deep understanding of the product, because strong
solutions are born where technology meets collaboration.

SKILLS
Frontend: React.js, Next.js, TypeScript, JavaScript
State Management: Redux Toolkit, RTK Query
UI / Styling: Styled-Components, SCSS, MUI, Ant Design
Architecture: SOLID, DRY, KISS, YAGNI
Performance: Lazy Loading, Memoization, Bundle Splitting
APIs / Data: REST, GraphQL, WebSockets, Axios
Testing: Jest, React Testing Library
Build / Tools: Git, Webpack, Vite, Jenkins, Postman, Chrome DevTools, Lighthouse
Collaboration: Figma, Jira, Confluence, Agile/Scrum
Other: Strapi CMS, Storybook

WORK EXPERIENCE
Frontend Developer • b2beings • Kyiv 04.2024 – Present
Develop frontend part of the Portality B2B platform for creating custom portals.
Prepared technical documentation before implementing each major module.
Implemented core widgets with full CMS configuration (Strapi).
Created a dynamic page rendering mechanism based on JSON configurations.
Developed a template system for pages.
Wrote tests for custom hooks and utilities (Jest), reducing critical bugs.
Built an embedded car charging widget from components to production deployment with payment
integration.
Tech stack: React, TypeScript, Next.js, Strapi, Redux Toolkit, RTK Query, Jest, REST API, WebSockets, Git,
CSS Modules, Jenkins
Frontend Developer • Atlaslive • Kyiv 06.2019 – 02.2024
Developed the frontend architecture of a high-load betting & casino platform.
Built a scalable UI component system as a private NPM package, including documentation in Storybook.
Led the development of key modules: sportsbook, casino, betslip, payments, user profile.
Collaborated closely with backend and design teams, participated in code reviews, and contributed to
continuous product improvement.
Tech stack: React, JavaScript, Redux Toolkit, Storybook, NPM, REST API, WebSockets, SCSS, Git, Jira

EDUCATION
Bachelor’s Degree, Faculty of Computer Engineering 2014 – 2018
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

ADDITIONAL INFORMATION
Languages: Ukrainian (native), English (B1)