Senior Android Engineer

Who Are We? 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. What We're Looking For We are seeking a highly skilled and product-focused Senior Android Engineer with demonstrated expertise in Domain-Driven Design, cross-functional product development, and Developer Productivity. In this position, you will collaborate closely with our Product, Engineering, and Data teams to support the continued development and enhancement of our applications. You will support iterative development methods and promote data-driven decision-making to ensure high-quality and effective solutions. KEY RESPONSIBILITIES: - Co-own and take technical ownership of the team’s codebase and production systems, ensuring stability, scalability, and long-term maintainability - Lead the design and development of high-quality, performant, and maintainable mobile solutions with a strong focus on architecture and best practices - Drive end-to-end delivery by translating complex user and product needs into robust technical solutions, from discovery through production - Shape the architecture and system design of the mobile application and its integrations with backend and platform services - Actively influence technical direction and raise engineering standards through code reviews, design discussions, and knowledge sharing - Collaborate cross-functionally with backend, frontend, security, infrastructure, and product teams to align on technical solutions and platform strategy - Serve as a trusted technical partner for product and design, contributing to roadmap discussions and technical decision-making - Mentor and support other engineers, fostering technical growth and a culture of ownership and excellence - Work hands-on with a modern Android stack, including Kotlin, Coroutines and Flow, Jetpack Compose, and Jetpack libraries (Architecture Components, Navigation, DataStore, Room, Hilt, etc.) - Identify opportunities for technical improvements and proactively drive initiatives that improve system quality, developer experience, and user impact - Deliver high-impact features in a customer-centric environment, taking responsibility for outcomes that affect millions of users REQUIRED SKILLS: - Solid 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 - Ability to manage risks, trade-offs and propose efficient solutions - Experience with design for testability, automated tests and willingness to work in an environment where engineers own the quality end-to-end - 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 - Product-minded approach with a bias for pragmatic, maintainable solutions NICE TO HAVE: - Experience with backend-driven UI - Experience with data and/or multimedia - Hands-on experience with OWASP mobile security best practices - 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) Candidate journey: ⭕️ Recruiter call ---> ⭕️ Live Code Review --> ⭕️ System Design interview---> ⭕️ Meet the hiring manager Check out some of our products Muscle Booster — https://musclebooster.fitness/ Yoga-Go — https://yoga-go.io/ WalkFit - http://walkfit.pro