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Konstantin Golubkov
Frontend React Developer

5+ years of experience in frontend development using React and modern JavaScript technologies
Location: Kharkov, Ukraine
Email: [open contact info](look above in the "contact info" section)
Github: https://github.com/K-ost
LinkedIn: [open contact info](look above in the "contact info" section)
Technical Skills

• HTML5, CSS3 (SCSS/SASS)
• Material UI, Styled Components, Tailwind, CSS-in-JS, Bootstrap
• JavaScript (ES6+), TypeScript
• React.js, React Native, Next.js
• React Hooks, Zustand, Redux Toolkit, React Hook Form, React-i18next
• REST API, Apollo GraphQL, Tanstack Query
• Unit, integration tests, React Testing Library, Vitest, Jest
• Git, CI/CD workflows
• Vite, Webpack
• Have some experience with Node.JS, Express, Mongoose, MongoDB, SQLite

Languages:
Russian, Ukrainian
English B2
Work Experience

U.S.-based company. Single Project
May 2024 - May 2025
• Developed a feature-rich single-page application (SPA) using React.js, fully integrated with a RESTful API.
• Collaborated closely with a distributed team using GitHub Flow: feature branching, pull requests, code reviews, and merging via CI pipelines.
• Participated in a CI/CD workflow: code changes triggered automated tests, followed by integration into the main branch and automated deployment to production.
• Used React Hooks, React Hook Form, Zustand, and TanStack Query for efficient state management and form handling.
• Focused on clean, reusable components and performance optimization.

DPromo
January 2015 – February 2022
• Built and maintained websites and mobile applications for various clients.
• Developed HTML email templates and mockups.
• Created and supported large-scale projects and SPAs.
• Worked with WordPress for CMS-based solutions.
• Applied modern CSS methodologies (SCSS/SASS) and UI libraries like bootstrap and Material UI
• ReactJS

Freelance / Various Projects
March 2019 – Present
• Developed and maintained client-side web applications using React.js and Next.js.
• Optimized website performance, ensuring fast load times and smooth user experiences.
• Integrated RESTful APIs for efficient data fetching.
• Collaborated with designers and backend developers to implement responsive UIs.
• Implemented state management solutions including Redux Toolkit, React Query, and Zustand.
• Wrote unit and integration tests using React Testing Library and Vitest.