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.


THE ROLE

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


Xsolla ID 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.
 
Language and platform


5+ years of commercial frontend development


TypeScript 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


Frameworks and state


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


UI quality and performance


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


Integration and security


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


Engineering practices


Testing at the right level: unit, integration, E2E


Git, CI, Docker, linters and formatters


AI-assisted engineering


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


English


Reading technical documentation in English


Experience in security-sensitive domains: authentication and identity (OAuth2/OIDC flows on the frontend), payments, crypto wallets


Web3 frontend: wallet integration (embedded and browser wallets), EIP-1193, EIP-6963, EIP-712; viem, wagmi, ethers.js


Next.js or Nuxt, SSR in production


Design systems and component API design, UI kits


Hybrid applications: WebView, React Native

WHAT YOU WILL OWN



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



WHAT YOU WILL DO



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