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
