Senior Front-end Engineer

🚀 Who Are We?

Welcome to Welltech—where health meets innovation! 🌍 As a global leader in Health & Fitness industry, we’ve crossed over 220 million installs with life-changing apps, all designed to boost well-being for millions. Our mission? To improve the health of millions of people through intuitive nutrition trackers, powerful fitness solutions, and personalized wellness journeys—all powered by a diverse team of over 700+ passionate professionals with a presence across 5 hubs.

Why Welltech? Imagine joining a team where your impact on global health and wellness is felt daily. At Welltech, we strive to be proactive wellness partners for our users, while continually evolving ourselves.

What We're Looking For We’re on the hunt for Senior Frontend Engineers who are ready to take ownership, lead with innovation, and build exceptional systems in two of our teams: Monetization - a core part of our new Product Growth & Monetization structure. User Trust - an essential part of our platform foundations and Ecosystem.

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.

The User Trust team safeguards and enhances the user journey across platforms by managing authentication, identity, and privacy workflows. From handling data takeout and deletion requests to developing a unified user profile experience, we’re focused on giving users control while unlocking smarter, more personalized product experiences. You’ll join a cross-functional team in the discovery phase of a critical initiative - streamlining user identity and profile management across our core products to improve operational efficiency and drive growth.

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 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

Nice to have:

• 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

Candidate journey: ⭕️ Recruiter call ----> ⭕️ Live Code Design Review --->  ⭕️System Design Interview -----> ⭕️ Meet the hiring manager

✨ Why 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 reality!

Check out some of our products

Muscle Booster — https://musclebooster.fitness/ 

Yoga-Go — https://yoga-go.io/ 

WalkFit - http://walkfit.pro