Senior Android Engineer (Platform)

About Welltech

About Welltech
Welltech is a global wellness technology company with Ukrainian roots. Our mission is to build and scale wellness apps globally through state-of-the-art, tech-driven performance marketing.
We are one of the most established players in the wellness app space, and we are accelerating. Over 25.5 million people across the world use our apps — Muscle Booster, Yoga-Go, and WalkFit — to build healthier habits, move more, and feel better every day. Every subscription represents a real person making a real change in their life, and we take that seriously.
With 500+ people across hubs in Cyprus, Ukraine, Poland, Spain, and the UK, we combine the scale of a market leader and the drive of a team that's just getting started.

Why join us?
Welltech is where your work reaches millions of real people.
We're looking for Well-Makers. You'll own decisions, outcomes, and the learning that comes with both. You'll move fast, because action beats perfection here. You'll say what you think, hear the truth back, and get better for it. And when the targets are big — and they are — you won't chase them alone.
If you want a job, there are easier places. If you want to go big — and do it together — this is it.

Position

This is a unique opportunity to build a platform from scratch, setting company-wide standards and driving the direction of our mobile technology. In the Mobile App Platform team, you will architect our next-gen mobile platform, directly shaping how millions experience wellness. You will design and implement core platform solutions, empowering product teams to rapidly build and customize applications. You will also own the mobile infrastructure blueprint, enabling teams to focus on features and experiments, free from underlying infrastructure concerns. This role demands a strong problem-solver who thrives on building, as you'll define a platform that scales to millions, creating a lasting legacy in mobile wellness.

Key responsibilities:

• Help build and evolve scalable mobile infrastructure, tooling, and shared components to support multiple Welltech mobile apps

• Contribute to libraries, SDKs, and CI/CD pipelines that improve developer experience and apps quality

• Work closely with product teams to support the adoption of platform solutions

• Write clean, testable, and performant code with an eye on maintainability

• Support modularization, reusability, and standardization efforts across mobile apps

• Identify common problems across apps and solve them in a consistent, scalable way

• Participate in code reviews, documentation, and knowledge sharing within the team

• Collaborate cross-functionally with backend, frontend, security, and infrastructure teams to enable seamless integration and platform alignment

Your qualification

• Solid Android development experience with Kotlin, including fundamentals like coroutines, networking, persistence, and performance optimization

• Experience with Jetpack Compose and modular, scalable UI architectures

• Excellent understanding of architectural patterns (MVVM, MVI, DI) and modular codebases

• Proven ability to craft clean, maintainable, and scalable code

• Strong ability to design for reliability, scalability, and performance

• Experience working with CI/CD pipelines and tooling (e.g., Bitrise, Fastlane, Gradle, custom scripts)

• Strong advocate of design for testability, automated testing, and shift-left quality mindset

• Passion for improving developer experience and shipping high-quality code

• Product-minded approach with a bias for pragmatic, maintainable solutions

Will be a plus

• Experience with backend development

• Experience with backend-driven UI

• Hands-on experience with OWASP mobile security best practices

• Track record of building internal tools, shared components, or platform features at scale

• Experience implementing and advocating for methodologies that support fast iteration and high dev productivity (e.g. eXtreme Programming, Trunk Based Development, CI/CD mindset, BDD, TDD)

What we offer

• 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!

Additional details

Candidate journey: HR call ---> Live Coding ---> System Design ---> Cultual fit interview

Check out some of our products

Muscle Booster — https://musclebooster.fitness/ 

Yoga-Go — https://yoga-go.io/ 

WalkFit - http://walkfit.pro