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Konstan n Golubkov
Frontend Engineer
[открыть контакты](см. выше в блоке «контактная информация») | Kharkiv, Ukraine | LinkedIn | GitHub

SUMMARY
Frontend Engineer with 5+ years of experience building scalable React and TypeScript web applica ons for
interna onal clients (including US-based companies). Experienced in CI/CD, tes ng (Vitest, React Tes ng
Library), REST APIs, and performance op miza on. Focused on UX, clean architecture, and remote
collabora on.

SKILLS
• JavaScript (ES6+), TypeScript, React, Next.js, React Na ve
• HTML5, CSS3 (SCSS/SASS), Tailwind, Material UI, Styled Components, Storybook
• Redux Toolkit, Zustand, React Hook Form, React Query, REST API, GraphQL (Apollo)
• Jest, Vitest, React Tes ng Library
• Git, CI/CD, Vite, Webpack

EXPERIENCE
Frontend React Developer | Freelance | Self-Employed
Jun 2025 — Present
• Developing and maintaining modern web applica ons using React and TypeScript
• Building scalable and responsive UI with focus on performance and UX
• Integra ng REST APIs and third-party services
• Wri ng and maintaining unit/integra on tests to ensure code quality and reliability
• Implemen ng CI/CD pipelines to automate builds and deployments

Middle Frontend React Developer | US Based So ware Company
May 2024 — May 2025
• Worked as a full- me contractor for a US-based SaaS company via Upwork
• Developed and op mized React applica ons with TypeScript
• Improved applica on performance and user experience
• Implemented responsive and maintainable UI components
• Covered features with unit/integra on tests (Vitest, React Tes ng Library)
• Worked with CI/CD work ows to ensure smooth deployment

Frontend Web Developer | Self-Employed Contractor
Jan 2020 — Mar 2024
• Built responsive web interfaces using JavaScript and CSS
• Integrated REST APIs and implemented client-side logic
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• Focused on performance, cross-browser compa bility, and clean code
• Worked with React, Ionic and Vue in produc on projects
• Converted UI designs into responsive web pages

LANGUAGES
English (C1), Russian (Na ve), Ukrainian (Professional)
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