Frontend Engineer

Job description

Job Title: Frontend Engineer Location: Armenia/Serbia Employment Type: Full-time About SiGMA World SiGMA World is a global events, media and technology group working across gaming, emerging technology, digital health and affiliate marketing. Founded in Malta in 2014, we’ve grown into a team of 450+ people across six global offices in Malta, Cyprus, Serbia, Armenia, Brazil and the Philippines. We bring together businesses, entrepreneurs, investors and industry leaders from around the world through our events, media, digital products, education, investment and philanthropic initiatives. Today, SiGMA is home to a diverse portfolio of businesses and brands, giving our team the opportunity to work across different industries, markets and projects. We’re always looking for talented people who want to grow with us and be part of what we’re building next! About the role We're looking for a front-end engineer who owns the experience users actually see: how fast it loads, how it behaves on a mid-range phone, and whether everyone can use it. You'll build and scale React applications served globally via CDN for a high-traffic, international audience, working closely with product, design, and back-end teams. We want someone who treats performance and accessibility as features rather than afterthoughts, and who thinks about how each component fits the wider system. If you notice a layout shift before anyone else does and can't leave it alone, this role is for you. Key Responsibilities Build and maintain fast, accessible, responsive web applications with React and TypeScript Contribute to front-end architecture, shared component libraries, and our design system Optimize delivery and performance: CDN and caching strategy, asset optimization, code splitting, and Core Web Vitals Integrate with APIs and back-end services in a cloud-based environment Turn designs (Figma) into polished, production-ready interfaces, and push back when designs don't hold up in real use Write automated tests and take part in code reviews and CI/CD improvements Monitor, debug, and resolve issues in development and production Work with QA and product to ship features that are reliable, not just complete Requirements 3+ years of professional front-end development, building production-grade web applications Strong React and TypeScript, including hooks, component design, and rendering performance Experience with state management and data fetching (e.g. TanStack Query, Zustand, Redux) Solid modern CSS and responsive, mobile-first development (Tailwind, CSS Modules, or similar) Hands-on performance work: Core Web Vitals, bundle analysis, lazy loading, caching Experience integrating REST and/or GraphQL APIs in production Working knowledge of accessibility standards (WCAG 2.2) and how to test for them Automated testing experience: Vitest or Jest, React Testing Library, and Playwright or Cypress Familiarity with front-end security basics (XSS, CSP, secure token handling) Comfortable with Git-based workflows, pull requests, and CI/CD pipelines Comfortable working in an AI-assisted workflow (e.g. Claude Code, Copilot, Cursor), with the judgment to review, verify, and take ownership of generated code Good written and spoken English Nice to have Deploying front-end applications on AWS (S3, CloudFront), including cache invalidation and CDN strategy js or other SSR/SSG frameworks Design systems and Storybook Monitoring and analytics tooling (e.g. Sentry, GA4, GTM) Internationalization for multilingual products Experience building SPAs for high-traffic or performance-critical platforms Would be beneficial Test automation experience with Playwright or Cypress Performance testing basics (Lighthouse, Core Web Vitals, k6 or JMeter) Experience testing WordPress sites, including Multisite and high-traffic sites Understanding of caching layers (Redis, Varnish, CDN) sufficient to reproduce and isolate cache-related issues Ability to set up local or test environments with Docker or WP-CLI Familiarity with CI/CD pipelines and how QA fits into release processes Experience testing event, ticketing, or payment flows