Senior Frontend Engineer

Xsolla·Russia·Удалённо·4 нед. назад

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.

Responsibilities

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

Nice to have

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