Founding Mobile Engineer

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.

1. Vibecheck
2. Take-home challenge
3. Talk to founders
4. Paid trial