About 0TO9

Team Is All

Ideas matter – but people make them real. In finance, that’s harder than it should be. Innovation shapes how we live, but progress is slowed by complexity, regulations, and outdated systems. Too often, great people go elsewhere.

0TO9 exists to change that.

We’re a fintech venture builder and investor – a bank for entrepreneurship, founded in Stockholm in 2025 by serial entrepreneur Oliver Hildebrandt.

Our mission: bring the right people, skills, and resources together so fintech founders can focus on building. From capital and compliance to tech and talent, we create an infrastructure for success.

Numbers are the building blocks of finance and with zero to nine, we can build anything. Our name says it all: From you to a team. From idea to impact. From now to what’s next.

With offices in Stockholm and Berlin, operations across the Nordics, and a growing portfolio – we’re just getting started.

About the role

You’ll be employed by 0TO9 and be lead engineer for our mobile apps, starting with building the app for our fintech venture Plus1 (of which we’ve already started building) – and over time supporting other products in the portfolio. You own the mobile app end-to-end: from first version to ongoing improvements, working closely with product, design and backend. You will:

• Build and maintain our React Native app for iOS and Android
• Design the architecture, tooling and standards for mobile at 0TO9
• Integrate with backend APIs and third-party services (auth, payments, analytics, etc.)
• Set up solid testing, release and monitoring practices for the app

About you

You’re a senior, hands-on mobile engineer who likes ownership and building things from scratch. You’re comfortable being the first mobile hire and setting the direction. You likely have:

• Several years of experience with React Native
• A track record of shipping apps to App Store and/or Google Play
• Strong skills in app architecture, state management and API integrations
• Experience with testing, performance and monitoring for mobile apps
• Professional English and a collaborative way of working
• Based in Stockholm or Wroclaw

What we offer:

• Be part of the leading fintech venture builder
• A dynamic, entrepreneurial, international and fast-paced environment
• Strong opportunities for growth and development
• Leading role in building world-class mobile apps