We are looking for a Founding Mobile Engineer to join us in building and scaling Bloom’s mobile app — starting with iOS and soon expanding to Android. You’ll take ownership of our mobile experience, push the boundaries of what React Native + Expo can do, and lay the foundation for Bloom’s app to reach millions of users. Bloom is a YC X25 startup making app development as easy as talking into your phone.
Core Traits About You
- You are a fast learner with an open mind.
- You love solving complex technical problems.
- You can clearly explain and communicate complex ideas to others.
- You have extensive experience building mobile apps with React Native.
- You have strong experience with Expo + EAS.
- You are very familiar with Typescript.
- You have worked with Swift/Objective-C or Kotlin (both is a big bonus).
Bonus Points
- You have worked with Convex.
- You’ve worked at a YC startup before or founded a startup yourself.
- You’ve already built something with Bloom.
Open Problems
- How do we build a world-class mobile DX for Bloom’s users and for our own team?
- How do we make the app blazing fast while still flexible enough to ship new features daily?
- How do we design mobile features that feel native while being powered by AI under the hood?
- How do we ensure our mobile stack scales to hundreds of thousands of builders?
- How do we integrate cross-platform features seamlessly (iOS → Android → Web)?
- How do we test and monitor quality, stability, and performance reliably?
What We Offer
- The chance to be an early team member at a YC-backed startup shaping the future of software creation.
- High ownership and autonomy over the mobile product.
- Competitive compensation with significant upside.
- A culture of speed, creativity, and ambition.
How to Apply
- Proof you meet the Core Traits.
- Proof you meet some Bonus Points.
- Your thoughts on solving some of the Open Problems (and any others you see).
- A link to your Github or apps you’ve shipped.
Bloom
