Serhii

Serhii Sezonchyk [open contact info](look above in the "contact info" section) Telegram/GitHub/LinkedIn

JavaScript developer [open contact info](look above in the "contact info" section) 14029, Chernihiv, Ukraine

ABOUT
I’m a frontend-developer with two years of experience working in diverse international teams. I
combine solid technical skills with an appreciation for design to deliver elegant and reliable
software. Driven by a passion for problem-solving, ongoing growth, and creating solutions that
make a real impact.

EXPERIENCE
Full-stack engineer Scrimmage | Jan 2025 - Jun 2025
Debugged and resolved issues in existing functionality
Developed and deployed new features to production (React, Nest.js, RTK)
Implemented UI components aligned with brand design guidelines
Created and maintained technical documentation for ongoing support
Full-stack engineer PJSC Chernigivoblenergo | Apr 2023 - Dec 2024
Developed and maintained full-stack applications using React, Express.js, PostgreSQL.
Delivered different projects, both independently and within teams
Wrote clean, efficient, and maintainable code
Refactored existing codebases to improve performance and scalability
Specialist in work with youth Chernihiv Youth Center | Jun 2022 - Sep 2022
Organization of different events for young people in Chernihiv city: teambuildings, master
classes, issuance of humanitarian aid, organization of assistance to war victims.

EDUCATION
National University “Chernigiv Polytechnic” 121 - software engineer
Sep 2023 - Jan 2025 Master’s degree
Hillel IT School Frontend PRO
Feb 2024 - Jul 2024 Excellent (100)
National University “Chernigiv Polytechnic” 121 - software engineer
Sep 2019 - Jun 2023 Bachelor’s degree

SKILLS
Front-end: HTML/CSS/JS, Typescript, SCSS, React, zustand, RTK, react-query, tailwind,
GSAP, motion, Next.js;
Back-end: node.js, express.js, sequelize, prisma, JWT, OAuth, Socket.IO, PostGIS,
Nest.js;
DB: SQL, PostgreSQL;
Version Control: git;
Software Architecture: RESTful API, WebSockets;

LANGUAGES
English B2 (Upper Intermediate)
Ukrainian Native Language