Flutter Engineer — Vehicle Inspection (f/m/x) | Berlin
Most mobile roles give you a backlog. This one gives you an industry.
You build the app our inspection teams use in the field — the tool that kicks off every vehicle assessment, every dispatch decision, and every pricing call across 130,000 vehicles a year. You work in a team where coding agents write the first draft and your judgement decides what survives review.
Location: Berlin Schöneberg — hybrid, 3 days office / 2 days remote
About us
CarOnSale is the AI-powered operating system 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.
What you'll own
- The vehicle inspection app — the mobile tool our inspection teams use in the field to assess, document and process vehicles. You own it end to end: design, build, maintain and improve it from concept to production
- Field-grade performance — our inspectors use this app in vehicle yards, on dealer forecourts, on weak connections. You profile, debug and optimise until it holds up in the real world, not just in the office
- AI-first development — coding agents, LLMs and AI-assisted development are part of the daily workflow here, not a pilot project. You decide where they accelerate the work and where they don't
- Technical bar — you set the standard for state management, networking, camera/media handling, offline-first architecture, and UI components. Your code is clean, testable and reviewed
- Architecture and direction — you shape technical decisions together with product managers, designers and backend engineers who own the broader inspection and logistics platform
- Team growth — you mentor less experienced engineers, review their work and raise the standard of the whole team
- Staying sharp — you track what moves in Flutter, Dart and mobile development and bring the tools 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, camera/media handling, UI/UX components
- Command of mobile fundamentals — performance optimization, offline-first architecture, 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 — you communicate clearly across an international team
- Based in Berlin or ready to relocate
Nice to have:
- Experience building apps used in field or operational environments (logistics, inspection, field service)
- Experience with camera integration, image processing, or document capture on mobile
- Automotive, marketplace or B2B platform background
- German at B2 level
What you can expect from us
- Hybrid working: 3 days office, 2 days remote
- 28 days annual leave
- 2× annual career & development conversations
- Company pension with 20% employer contribution
- Subsidised Deutschlandticket
- FitX or Urban Sports Club membership subsidy
- Structured onboarding with buddy programme and social events
- Lived diversity: active women's network, meditation & prayer room, dog-friendly office
Skills Required
- 3+ years 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
- AI-native way of working using tools like Claude, ChatGPT or Copilot with sound judgment
- English at C1 level
- Based in Berlin or ready to relocate
- Experience in automotive, marketplace or B2B platform environments
- German at B2 level
What We Do
Our vision is to make automotive wholesale frictionless across Europe. We developed an innovative marketplace to connect buyers and sellers. We are ambitious, digital and reliable. We are committed to provide our customers with the easiest, most profitable and personal solution. Together with our ambitious team, we set new standards in the remarking of used cars. We are looking for talents who believe in our vision and support us in the digitization of automotive wholesale. If you are looking for a place to realize your full potential and grow beyond your limits - COS is your place! CarOnSale (Castle Tech GmbH) Hauptstraße 27 Haus 9 Aufgang N 10827 Berlin Managing Director: Tom Krüger Phone: +49 30 311 96 400 E-Mail: [email protected] Registry court: Charlottenburg Local Court (Berlin), HRB 213350 B Sales tax identification number according to §27a Umsatzsteuergesetz: DE320199054 Tax number: 241/123/11331 Privacy policy https://www.caronsale.com/de/datenschutz
