Freelance Mobile Platform Engineer

Department: CEO Office

Location: Berlin

Employment Type: Contract

About Foundation

Foundation is responsible for the technical base that Knowunity's product teams build on. Our work is measured by its effect on the rest of engineering: reliable systems, sound architecture, and tooling that let product teams focus on their features rather than the underlying infrastructure.

Our areas of ownership:

• The Flutter mobile app foundation - shared components and design system, app architecture, state management, and performance.

• The core backend in Go - the shared services and conventions that product features are built on.

• Infrastructure and delivery - CI/CD, store distribution, release tooling, and the feedback loops between writing code and shipping it.

• Developer experience - the internal tooling and standards that keep the wider organisation productive.

• Agentic and AI infrastructure - how AI tooling is integrated into our codebase and workflows today, and how it will factor into the product over time.

We are looking for a freelance Mobile Platform Engineer to help shape and maintain this foundation. The role's focus is the mobile app, but we expect genuine interest in the full scope of Foundation's work - the team's value comes from its leverage across all of these areas, not from any single features.

The engagement

• Contract basis, open to full-time or part-time weekly commitment depending on your availability.

• Initial engagement with scope to extend based on fit and pipeline of work.

• You'll plug into an existing team, so we're looking for someone who can get productive quickly and work independently with light coordination.

Responsibilities

• Mobile foundation. Own the core of our Flutter app: shared components, the design system, performance, and tooling.

• Architecture. Define how we build features - the patterns we use, how we manage state, and how the app integrates with backend services - and guide product teams in applying them.

• Developer experience. Improve the end-to-end developer workflow, from CI/CD and store distribution to internal tooling and faster feedback loops. Remove the recurring friction that slows other teams down.

• Agentic and AI infrastructure. Integrate AI tooling into our codebase and workflows, and help determine its role in the product. A research background is not required, but a serious interest in agents as an engineering discipline is.

• Maintenance and reliability. Alongside new work, keep the existing foundation healthy and dependable, so product teams can build on it with confidence.

Your Background

• Several years of experience delivering production software at scale, ideally including responsibility for the architecture of a mobile application.

• Strong, multi year experience in building mobile apps with Flutter and Dart.

• Solid mobile DevOps experience - CI/CD, store distribution, and release management.

• A genuine interest in AI as an engineering surface; curiosity matters more than formal background.

• A preference for improving the systems that slow others down. You reason clearly about trade-offs, communicate effectively across teams, and take satisfaction in work whether or not your name is attached to a shipped feature.