Сергій

Serhii Korchkov
[open contact info](look above in the "contact info" section) | t.me/SerhiiKorchkov | Kyiv, Ukraine (Remote) | [open contact info](look above in the "contact info" section) |
github.com/SergeyKorchkov

Summary
Frontend / Full-Stack Developer with commercial experience building and improving web applications using React, Node.js, Express,
and SQL/NoSQL databases. Experienced in working with both legacy enterprise systems and startup products built from scratch.
Currently pursuing a BSc in Computer Science at Griffith College Dublin.

Experience
Full-Stack Developer Mar 2025 – Jan 2026
Evolves
•Built a startup product from scratch, developing both frontend and backend parts of the application
•Designed and implemented REST APIs using Node.js and Express, improving data flow and system stability
• Implemented JWT-based authentication, securing user data and reducing unauthorized access risks

• Optimized database queries using MongoDB and PostgreSQL, reducing response times by approximately 30%

• Integrated frontend and backend logic, handling API communication, state management, and error processing

Frontend Developer Feb 2023 – Feb 2025
AurosIQ
• Worked on a large legacy task management platform, improving performance, stability, and user experience
• Completed 100+ frontend tasks with a 95% success rate, delivering features with minimal post-release issues
• Developed and enhanced UI components using JavaScript, SCSS, and DHTMLX, improving usability and consistency

• Refactored legacy code, reducing complexity and improving maintainability, accelerating development by 20%

• Resolved 50+ bugs across frontend and integration layers, improving platform stability and reducing production issues

Projects
DataFlow Hub (InfoPortal Pro) | React, Node.js, Express, MySQL, JWT | [Live] | [GitHub]

•Developed a full-stack web application with authentication and protected routes using React, Node.js, and Express
•Implemented secure user authentication with JWT, handling sessions and access control for private content
• Integrated external APIs for cryptocurrency, weather, currency exchange, and movies

• Built a responsive, mobile-first UI with dashboards, charts, and dynamic data visualization

• Deployed and maintained a production-ready application using Vercel and Render

Premium Shop (E-commerce SPA) | React, TypeScript, Redux Toolkit, RTK Query | [Live] | [GitHub]

• Built a production-style e-commerce SPA with product listing, filtering, cart management, and checkout flow
• Implemented state management using Redux Toolkit and RTK Query with persisted cart state across sessions
• Designed resilient data fetching using primary and fallback API strategy to handle service failures

• Added feature flags, lazy-loaded routes, and i18n support to improve scalability and user experience

• Covered core business logic with unit tests using Jest and React Testing Library

Technical Skills
Languages: JavaScript, TypeScript, SQL
Frontend: React, Redux Toolkit, RTK Query, Tailwind CSS, SCSS, Bootstrap
Backend: Node.js, Express, REST API, JWT Authentication
Databases: MySQL, MongoDB, PostgreSQL
Tools: Git, GitHub, Vercel, Render, Postman
Testing: Jest, React Testing Library
English: C1 Advanced

Education
Griffith College | BSc (Hons) in Computer Science Dublin, Ireland | Sep. 2024 – Jan. 2028