Senior Frontend Engineer

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.

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We are hiring a Senior Frontend Engineer for two platform products:

• Xsolla is the identity and authentication platform behind sign-in, account management and SSO across Xsolla products.
• Xsolla ZK is Web3 wallet infrastructure: smart wallets and account abstraction on a zkSync-based L2.

Both products sit on users' most sensitive flows: logging in and signing transactions.

• The frontend of your product area end to end: shaping tasks with Product and Design, implementation, release and production monitoring
• Technical decisions for that frontend. You make them and justify them in writing, rather than only implementing someone else's
• The architecture of frontend applications and the shared UI library / SDK that other teams build on
• Measurable frontend quality: performance, reliability and security of user flows

• Design and build user flows: sign-in, account management, wallet onboarding and transaction signing
• Track how these flows behave in production (errors, performance, drop-offs) and act on what you see
• Make architectural decisions for frontend applications and document them
• Develop the shared component library and frontend SDKs used by other Xsolla teams
• Agree API contracts with backend engineers, including error handling, retries and edge cases
• Own performance budgets:
  Core Web Vitals and bundle size
• Improve the engineering environment: build, linters, tests, CI
• Review code
• Set up and maintain AI tooling in the repositories (Claude Code, Codex, Cursor: rules, context, harness) so the team uses it effectively

• 5+ years of commercial frontend development
• Type Script in strict mode: generics, utility types, discriminated unions, typing module boundaries and external data
• JavaScript at the platform level: event loop, asynchrony, closures, memory. You can find a leak and explain its cause

• Deep experience with React: rendering model, profiling, eliminating unnecessary re-renders
• Separating local, server and global state, and justifying the choice of tool; reasoning about when SSR is worth it

• Semantic, responsive, cross-browser layout; modern CSS (CSS Modules, CSS-in-JS)
• Accessibility: ARIA, keyboard navigation, screen reader support
• Performance analysis: profiling, bundle analysis, Core Web Vitals

• REST API integration: error handling, retries, request cancellation, contract alignment with backend
• Web security fundamentals: XSS, CSRF, CSP, secure handling of tokens, sessions and user data

• Testing at the right level: unit, integration, E2E
• Git, CI, Docker, linters and for matters

• Daily hands-on use of AI coding tools (Claude Code, Codex, Cursor) for development and review, including configuring them for a repository

• Reading technical documentation in English
• Experience in security-sensitive domains: authentication and identity (OAuth2/OIDC flows…