Олександр

Oleksandr Leonov
Fullstack developer
[open contact info](look above in the "contact info" section) Kharkiv, Ukraine GitHub Linkedin Telegram

Summary
Fullstack developer with 2+ years of experience in React, TypeScript, and Node.js, with additional
background in Electron desktop apps and React Native mobile development. Experienced in shaping
frontend architecture, rebuilding legacy systems, and working across the full development lifecycle from
design to deployment.

Experience
Gsolution Kharkiv, Ukraine
Fullstack Developer August 2025 - Present
• Primarily worked on the frontend using React, JS/TS, Redux/Zustand, and SCSS; also contributed to backend
tasks with Express.js/NestJS, PostgreSQL/MySQL/MongoDB.

• Maintained the frontend of a CRM product, shaping its architecture and proposing technical improvements.

• Built and maintained data-heavy reusable table components based on TanStack Table to keep the
codebase flexible, maintainable, and aligned with evolving product requirements.

• Wrote internal documentation for teammates and collaborated closely with backend developers and QA
engineers.

• Rebuilt a legacy project from scratch, improving its performance, maintainability and overall code
structure.

• Contributed to a non-custodial crypto wallet built with Electron.js and TypeScript, taking ownership of the
auto-update system, update server and release process.

• Performed manual deployments to remote servers and handled application releases.

Insiders Lviv, Ukraine
Fullstack developer February 2025 - April 2025
• Participated in the development of a marketplace platform for the Italian market using Next.js, Node. js,
Supabase, and PostgreSQL.

• Implemented an administrative panel for managing the site and content.

• Transitioned to mobile development, creating React Native version of the platform.

• Utilized Docker for containerization and deployment processes.

• Collaborated directly with clients to gather requirements and provide project updates.

Freelancehunt March 2024 - January 2025
Freelance Developer
• Developed web applications and landing pages.

• Created automation scripts and data parsers.

• Built desktop applications.

• Designed and implemented mobile applications.
Languages
Ukrainian - Native Russian - Native English - Intermediate (B1)

Skills
Programming Languages Frontend Development Backend Development
JavaScript, TypeScript HTML, CSS, SCSS, SASS, Tailwind CSS, Node.js, Express.js, MongoDB, MySQL,
React, Next.js, Redux, Zustand PostgreSQL, Firebase, Supabase,
node-telegram-bot-api, Puppeteer

Tools & Technologies Desktop & Mobile Development UI Libraries
Git, GitHub, Figma, Postman, Docker Electron.js, React Native Material UI, Radix UI, ShadCNUI

Education
Kharkiv National University of Radio Electronics Master's degree
Computer Engineering September 2025 - Present

Kharkiv National University of Radio Electronics Bachelor's degree
Computer Engineering September 2021 - July 2025