Senior Frontend Engineer

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