Flutter Developer (m/w/d)

Most mobile roles give you a backlog. This one gives you an industry. You build the app 40,000 professional car dealers open to buy, price and move vehicles, in a team where coding agents write the first draft and your judgement decides what survives review.

Location: Berlin Schöneberg – you work on site in our office, hybrid with 3 days office and 2 days home office.

About us

CarOnSale is the AI-powered platform for B2B used car trading in Europe. Over 40,000 buyers from more than 20 countries trade on our platform — and 85% of inventory is exclusive to us. We connect software, pricing intelligence, logistics and financing in one layer — as the operating system for an entire industry.

One Platform. One Profit Engine.

Your responsibilities

• You own mobile features end to end: you design, build and maintain scalable Flutter and Dart applications, from concept to production

• You build AI-first. Coding agents, LLMs and AI-assisted development are part of the daily workflow here, not a pilot project, and you decide where they accelerate the work and where they don't

• You set the technical bar for state management, networking and UI components, and you write code that is clean, testable and reviewed

• You drive performance: you profile, debug and optimise the app until it holds up in the yard, on a dealer's phone, on a weak connection

• You shape architecture and technical direction together with product managers, designers and backend engineers

• You mentor less experienced engineers, review their work and raise the standard of the whole team

• You track what moves in Flutter, Dart and mobile development, and you bring the tools that are worth adopting into the team

What you bring

• 3+ years of professional experience building production apps with Flutter and Dart

• Proven depth in complex mobile applications: state management, networking, API integration, UI and UX components

• Command of mobile fundamentals: performance optimisation, security and accessibility

• Experience with CI/CD pipelines and agile delivery

• An AI-native way of working: you use tools like Claude, ChatGPT or Copilot actively in your development workflow and have real judgement about their limits

• English at C1 level, and you communicate clearly across an international team

• Based in Berlin or ready to relocate

Nice to have

• Experience in automotive, marketplace or B2B platform environments

• German at B2 level

What you can expect from us

• Hybrid working: 3 days in office, 2 days remote

• 28 days annual leave

• 2× annual career & development conversations

• Company pension with 20% employer contribution

• Subsidised Deutschlandticket (public transport)

• FitX membership or Urban Sports Club subsidy

• Structured onboarding with buddy programme and social events

• Lived diversity: active women's network, meditation & prayer room, dog-friendly office

Apply now – your CV is enough.