Senior Mobile Developer

About this position

Your mission as a Senior Mobile Developer at HackMotion will be to take on our toughest technical challenges as product capabilities grow. You’ll play a key role in designing and implementing solutions to non-trivial engineering problems that arise from growing product complexity, ensuring we can keep our product development fast and sustainable.

You’ll become a key part of our ever-growing and highly motivated product team, working closely with other engineers, designers, product and technical leadership. Your work will be focused on our cross-platform Flutter application and the surrounding cloud infrastructure built on Firebase (Google Cloud), TypeScript and C# (ASP.NET Core).

The work will be truly engaging and fun, and you will be able to learn a lot. We do everything in-house : from physical hardware design and embedded firmware to our app and cloud infrastructure.

We build and maintain iOS and Android applications with a single code base on Flutter. Our app blends sports tech with game-like training: live motion tracking, real-time audio and vibration feedback, responsive animations, and interactive practice drills. It’s a rare chance to work on software that people literally hold, wear, and play with every day.

Your tasks

• Implement deep technical projects across the HackMotion app and its surrounding infrastructure. • Conduct the research and prototyping whenever we need to expand our capabilities or solve non-obvious technical puzzles. • Act as a technical sounding board, consulting on technical decisions through code reviews and everyday problem-solving. • Champion sound software design and testing, ensuring we can adapt to changing product requirements safely and quickly. • Bring your technical perspective to product and engineering planning sessions.

What we expect

• At least 3 years of relevant software development experience. • Proficiency building apps with a modern declarative UI framework (mobile experience like Flutter, React Native, SwiftUI, or Compose preferred) and enthusiasm to work with Flutter. • Solid grasp of object-oriented programming concepts, architecture design, and domain modeling. • Experience with designing and maintaining reliable test suites. • Experience with designing and deploying databases (SQL or NoSQL) to meet application needs over time. • Basic familiarity with cloud infrastructure concepts (AWS, GCP, etc.). • Proficiency with Git, familiarity with CI/CD systems (knowledge of Jujutsu VCS is a bonus). • Sharp analytical problem-solving skills. • Fluent English communication (both written and verbal).