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We are Welltech — a global company with Ukrainian roots and a powerful mission: to move everybody to start and stay well for life . With five hubs across Cyprus, Ukraine, Poland, Spain and the UK and a diverse, remote-friendly team of 700+ professionals, we continue to scale rapidly. Our innovative apps — Muscle Booster, Yoga-Go and WalkFit — empower millions to transform their lifestyles and unlock their personal wellness journeys. We’re on the hunt for a Senior Frontend Engineer who’s ready to take ownership, lead with innovation, and build exceptional systems in the Monetization team - a core part of our Product Growth structure. If you're passionate about data-driven user journeys, experimentation, and highly optimized purchasing flows - this is something for you. We're a data-driven engine, constantly running experiments, refining strategies, and unlocking sustainable revenue growth. Work closely with cross-functional teams including Frontend/Backend Engineers, QA, Product Analysts, and Product Managers to design, develop, and deliver innovative solutions that directly influence user experience and revenue. Translate business requirements into performant, maintainable code that shapes user trust and monetization experience. Take responsibility for system performance, scalability, and data integrity. Participate in monitoring (Sentry, Datadog). Build with Best-in-Class Tech: Craft modern solutions using React 18+, React-Query, Styled Components, TypeScript 5+, and Vite. Help shape how we architect, deploy, and scale services used by a global user base. Senior-level experience building and maintaining frontend applications in a product-first environment Mastery of JavaScript (ES6+) and TypeScript, with an eye for performance and maintainability Advanced knowledge of React and its ecosystem — you’re comfortable with Redux Saga, Core Web Vitals, and beyond A deep understanding of how the web works, including RESTful API integration, web security, and responsive UX patterns Solid grasp of software design principles — you live by SOLID and know how to apply design patterns pragmatically Experience implementing testing strategies Strong communication skills and fluent English (C1) — you're confident leading discussions and documenting decisions A passion for crafting delightful user experiences, and a mindset of continuous growth and learning Experience working with experimentation platforms and running A/B or multivariate tests Experience with Material UI and its design philosophy Familiarity with Next.js, SSR, and performance optimization The confidence to set up or optimize bundler configs (Webpack/Vite) from scratch Ready to make a transformative impact on global wellness? As we are growing our hub in Cyprus, we are offering full relocation support for this role. You’ll receive assistance with everything from visa and paperwork to finding accommodation and settling in. It’s not just about the effort, but the difference we make every day.
