Senior Frontend Engineer

ABOUT US

Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500+ game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have all the things needed to enjoy the game.

For more information, visit xsolla.com .

ABOUT YOU

We are looking for a Senior Frontend Engineer who is passionate about building fast, accessible, and delightful user interfaces to join one of our product engineering teams. The best candidate will be someone who thrives in a fast-paced, highly collaborative, and dynamic setting and is excited to develop high-quality web applications used by millions of people .

Strong frontend development skills with deep JavaScript/TypeScript expertise are essential, along with experience in building performant, cross-browser, and responsive applications using modern frameworks . The ability to create maintainable component systems while delivering an exceptional user experience will be key to your success in this role.

If you care about craftsmanship, performance, and product quality and want to shape the way users interact with products used around the world , we would love to hear from you! Responsibilities Develop and maintain high-quality frontend applications and features

Write clean, maintainable, well-tested code with comprehensive unit and E2E test coverage

Build semantic, adaptive, cross-browser, and cross-platform layouts following web standards and accessibility best practices

Design and implement reusable component systems and contribute to the shared UI library

Optimize application performance (rendering, bundle size, Core Web Vitals)

Collaborate with designers (Figma) to deliver pixel-perfect, consistent implementations

Integrate with backend services and external APIs; agree on API contracts with backend engineers

Configure and improve build tooling, CI/CD pipelines, and Docker environments

Participate in code reviews, technical discussions, and architectural decisions

Mentor Middle and Junior engineers and contribute to improving product quality

ABOUT THE TEAM

You will join a product engineering team of frontend, backend, QA, and DevOps engineers working closely with Product and Design. The team owns its features end to end: from implementation and testing to release and monitoring.

Typical Tech Stack:

Languages: JavaScript (ES6+), TypeScript

Frameworks: React, Vue, Next.js (SSR)

State Management: RTK, MobX, Zustand, Pinia

Build Tools: Vite, Webpack, SWC

Styling: SCSS, CSS Modules, CSS-in-JS

Quality Tools: ESLint, StyleLint, Prettier, Husky

Testing: Unit and E2E testing frameworks

Infrastructure: Docker, GitLab CI/CD Nice to have Required:

Core JavaScript/TypeScript Expertise:

5+ years of commercial frontend development experience

Advanced proficiency in JavaScript (ES6+) , including asynchronous programming (async/await, Promises), prototype-based OOP, classes, and memory management fundamentals

Deep TypeScript knowledge: generics, utility types, custom type declarations, and extending library types

Frontend Engineering Skills:

Advanced experience with semantic, adaptive, cross-browser, and cross-platform layouts; understanding of web standards and accessibility

Strong CSS skills, including SASS/SCSS and CSS-in-JS solutions

Experience with modern frameworks ( React , Vue , or similar): reactivity principles, state management, component optimization, and render control

Experience with various state managers

Experience with SSR/isomorphic applications

Experience building component systems , including the compound components approach

Understanding of data structures , algorithm complexity, and common design patterns

Knowledge of basic caching techniques (e.g., LRU)

Ability to decompose tasks and separate business logic from framework/library code

Tools & Practices:

Experience configuring and optimizing build tools ( Vite , Webpack )

Experience with code quality tools ( ESLint , StyleLint , Prettier , Biome)

Experience writing unit and E2E tests

Understanding of REST API fundamentals and experience integrating with external services

Experience with Docker (configuring and optimizing containers)

Proficiency with Git (GitLab)

Confident use of Figma for design implementation

Good written and spoken English

Preferred:

Experience with hybrid applications (WebView, React Native)

Experience with Web3 frontend development : wallet integration (embedded and browser wallets), wallet and signing standards (EIP-1193, EIP-6963, EIP-712), ethers.js , viem , wagmi

Knowledge of Core Web Vitals and SEO principles

Experience with web security fundamentals (XSS, CSRF, secure handling of user data)

Experience with frontend performance profiling and monitoring

Experience creating and maintaining design system libraries

Experience leading technical initiatives or mentoring engineers

Practical, up-to-date experience with modern AI tools (e.g. Claude, Copilot, Cursor) for code generation, review, and accelerating day-to-day engineering work

IDEAL CANDIDATE

Eager to learn new technologies and approaches

Engaged with business processes and product goals

Detail-oriented with a responsible approach to work

Actively participates in discussions to improve product quality

Motivated to build products that make a difference for users