Senior Frontend Engineer

Who Are We?We are Welltech — a global company with Ukrainian roots and a powerful mission: to move everybody to start and stay well for life. Today 25.5 million users have trusted Welltech to help them build healthy habits — a testament to the real value our innovative, engaging wellness solutions deliver every day.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. Welltech is where your impact becomes real. And our values clearly attest to that: we grow together, we drive results, we lead by example and we are well-makers. If this looks like you and you thrive in a fast-paced environment, you'll fit right in at Welltech. Let's build wellness for millions together.What We're Looking ForWe'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.Our Monetization team maximizes user trust by creating seamless, transparent pricing experiences. We're a data-driven engine, constantly running experiments, refining strategies, and unlocking sustainable revenue growth. You'll work alongside experienced team members to evolve our monetization models and build products that matter - both for our users and our business.Key responsibilities:Collaborate across disciplines: 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. You won't just ship code — you'll shape how millions interact with our products.Engineer with purpose: Translate business requirements into performant, maintainable code that shapes user trust and monetization experience.Own your systems: Take responsibility for system performance, scalability, and data integrity. Spot issues before they happen and suggest smart fixes. Participate in monitoring (Sentry, Datadog).Drive product and system evolution: Take initiative in shaping the future of our user identity and privacy systems. Audit what exists, identify areas for improvement, and lead the transformation of existing flows into modern, user-first solutions that unlock real value for both the company and our users.Elevate the Standard: Be a champion of engineering excellence. Drive clean code practices, lead code reviews, mentor peers, and contribute to a culture of innovation. Share knowledge and bring strategic thinking into technical discussions.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.Required skills:Senior-level experience building and maintaining frontend applications in a product-first environmentMastery of JavaScript (ES6+) and TypeScript, with an eye for performance and maintainabilityAdvanced knowledge of React and its ecosystem — you're comfortable with Redux Saga, Core Web Vitals, and beyondA deep understanding of how the web works, including RESTful API integration, web security, and responsive UX patternsSolid grasp of software design principles — you live by SOLID and know how to apply design patterns pragmaticallyExperience implementing testing strategiesStrong communication skills and fluent English (C1) — you're confident leading discussions and documenting decisionsA passion for crafting delightful user experiences, and a mindset of continuous growth and learningNice to have:Experience working with experimentation platforms and running A/B or multivariate testsExperience with Material UI and its design philosophyFamiliarity with , SSR, and performance optimizationThe confidence to set up or optimize bundler configs (Webpack/Vite) from scratchReady to make a transformative impact on global wellness? Join us at Welltech and help millions of users lead healthier, happier livesAs 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. Whether you're moving alone or with your family, our team will ensure a smooth and stress-free transition. Join us in beautiful Cyprus and be part of an exciting new chapter as we expand our presence on the islandCandidate journey: Recruiter call -> Live Code Review -> System Design interview-> Meet the hiring managerWhy You'll Love Being Part of Welltech:Grow Together: Join a culture that champions both personal and professional growth. Here, you'll thrive as we learn, evolve, and succeed together.Lead by Example: No matter your role, your leadership matters. Every team member is empowered to inspire and make an impact.Results-Driven: We're all about achieving meaningful outcomes. It's not just about the effort, but the difference we make every day.We Are Well-Makers: Be part of a movement that's creating a healthier, happier world. Together, we make well-being a realityCheck out some of our productsMuscle Booster — https://musclebooster.fitness/Yoga-Go — https://yoga-WalkFit -