Open to opportunities

Slava User

@slavashubin

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Senior frontend developer specializing in React, TypeScript, and high-load performance.

Serbia

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What I'm looking for

I’m open to interesting frontend roles building complex products and tackling technical challenges—especially performance, frontend architecture, and high-load interfaces with deep React & TypeScript ownership.

I’m a Senior Frontend Developer with 5+ years of experience building high-load web applications for fintech, enterprise, and airline industries. I specialize in React & TypeScript, performance optimization, and architecture design for complex products used by millions of users.

I focus on ownership of frontend architecture and complex UI systems, from interaction logic to maintainability. I deeply work with React & TypeScript, optimize performance for large datasets and high-traffic apps, and refactor/modernize legacy codebases. I collaborate closely with backend, product, and design teams, and I’ve contributed to open source projects.

I’ve built and shipped frontend modules for 10M+ users, reducing render and load times by 30–40%. I also improved key product metrics like conversion and completion rate by 15–25%, and delivered multiple projects from scratch to production. I mentor frontend engineers and lead code reviews to raise team quality.

My toolkit spans React/Vue with modern state management (Redux, Effector, MobX, Zustand), styling approaches (CSS Modules, Styled Components, SCSS/SASS/LESS), and testing (Jest, Cypress, Enzyme, RTL). On the platform side, I work with Node.js (Express/Koa), REST/GraphQL, WebSockets/Stomp, and SSR via Next.js—plus practical engineering skills with Webpack, Docker, and Storybook.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Developer

Current

T1 Group

Sep 2025 - Present (10 months)

Lead Frontend Developer
Innotech Group · Sep 2025 — Present
Development and support of process automation systems for enterprise products.
Responsibilities & impact:
* Developed and maintained the frontend part of enterprise web applications
* Designed frontend architecture and interaction logic
* Refactored legacy codebase and improved maintainability
* Implemented UI layouts and interactive comp

React Machine Learning Python TypeScript Дизайнер продукту Webpack JavaScript Zustand CSS Modules Web

Frontend Developer

iFellow

Feb 2023 - Sep 2025 (2 years 7 months)

Senior / Lead Frontend Developer
iFellow (Sber ecosystem projects) · Feb 2023 — Sep 2025
Auto Loans Module (SBOL & SBOL.Pro)
* Built frontend modules for 10M+ users
* Reduced application processing time by 25%
* Migrated to internal libraries (enterprise-level constraint)
* Optimized page rendering by 30%
* Integrated CMS → UI updates without code changes
* Led code reviews and onboarding of 2 fro

JavaScript JavaScript (Node.Js TypeScript Java Проектирование пользовательского интерфейса (UED)React Redux Jest Cypress Figma Effector

Lead Frontend Developer

Sberbank

Sep 2023 - Oct 2024 (1 year 1 month)

JavaScript Front End Design User Experience (UX)TypeScript React Redux Effector Jest Cypress Figma Pub Sub

Frontend Web Developer

Utair Group

Feb 2021 - Feb 2023 (2 years)

Frontend Developer
UTair Airlines · Feb 2021 — Feb 2023
Call Center Widget
* Built widget from scratch to production
* Integrated with official website
* Set up Sentry monitoring
* Configured CI/CD and Webpack
Tech: React, TypeScript, Redux, WebSockets

Call Center Operator App
* Optimized network requests and rendering
* Improved WebRTC telephony stability
* Performed full UI redesign
* Migrated