Frontend Engineer

• 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