Сергій

Serhii Yarosh
Frontend Developer
Kyiv, Ukraine (open to relocation) · Phone: [open contact info](look above in the "contact info" section) · Email: [open contact info](look above in the "contact info" section)
LinkedIn: [open contact info](look above in the "contact info" section) · Telegram: t.me/yaroshserhii
English (B1+) · Ukrainian (Native)

SUMMARY
Frontend Developer with 5+ years building production web applications across travel and media, including
experience leading a frontend team of three. Focus on React, TypeScript and Redux Toolkit across SPA
dashboards, PWAs and server-rendered public sites. Hands-on with build tooling, web performance and end-to-
end testing.

SKILLS

Languages: JavaScript, TypeScript, HTML5, CSS3

Libraries & Frameworks: React, Redux Toolkit, React Router, React Hook Form, Next.js, jQuery, Chart.js,
Leaflet

Styling: SCSS, MUI, Bootstrap

Tools & Build: Webpack, Gulp, PWA, ESLint, Prettier

Testing: Cypress (e2e), Mocha/Chai/Supertest

Integrations & APIs: REST API, Axios, WebSockets, Web Push, Google Maps API, OAuth/JWT

Backend: PHP (Phalcon), Node.js

Other: Git, CI/CD, Docker, Jira, Core Web Vitals, SEO, i18n, AI-assisted development

EXPERIENCE
City Unscripted Aug 2022 - Present
Travel & tours booking service
– Frontend Lead Aug 2024 - Present
– Frontend Developer Aug 2022 - Aug 2024
Led a frontend team of 3, coordinating day-to-day work with design, product, backend and marketing
teams
Rebuilt 80-90% of the public site's pages and introduced a system of reusable sections and scripts that
sped up page delivery across the team
Improved Core Web Vitals and PageSpeed scores via lazy loading, bundle splitting and image optimization
Migrated the SPA build from Create React App to a custom Webpack setup
Built a real-time chat system (WebSocket) for the PWA and admin panel, and interactive product-preview
maps (Google Maps API, Leaflet)
Developed a partner-facing admin panel and upgraded the Bootstrap library across the dashboard
Covered critical user flows with Cypress e2e tests

Technologies: React, Redux Toolkit, TypeScript, Axios, React Router, Webpack, SCSS, Bootstrap, jQuery,
Gulp, PHP (Phalcon), WebSockets, PWA, Chart.js, OAuth/JWT, Cypress, Mocha/Chai/Supertest, Docker, Git

Gelios — Frontend Developer Jun 2021 - Jul 2022
Audio streaming and media service

Technologies: HTML, SCSS, JavaScript, React, React-Router, Redux, Redux-Saga, Axios, MelonPlayer,
Google Analytics, Git

EDUCATION
Bachelor's Degree Sep 2016 - Jun 2020
Chernihiv National University of Technology, Chernihiv

Electrical power engineering, electrical engineering and electromechanics

Software Development Sep 2014 - Mar 2017
Computer Academy "STEP", Chernihiv