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Principal App Engineer

Germany, Hamburg or Berlin 85000.00 EUR / Year · Job Posted December 14, 2025
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Job Description

We are currently looking for a skilled Principal App Engineer (m/f/d) with a passion to assume leadership responsibilities to support us in building the fastest & most intuitive shopping app using a brand-new tech stack onsite in Hamburg or Berlin! As a Principal position, this role requires a high degree of autonomous working and reports directly to the Director of Engineering. You will be the primary technical lead responsible for all app teams, driving technical discussions and ensuring our solutions are robust and forward-thinking. The App & Web Team constantly improves the App, Mobile Website and Desktop Website. These big-scale products are each visited by over 11M active users every month. The team’s focus is to provide our customers the most inspiring, convenient, intuitive, and easy-to-use shopping experience. They constantly challenge themselves to raise the bar of what is “state of the art” in customer-facing products.

Job Responsibility

  • Build and maintain a high-quality mobile application using Flutter for iOS and Android platforms
  • Participate as a solution architect from the very beginning of new projects
  • Gain significant exposure to other teams to align solutions and drive the tech stack of all teams forward
  • Drive technical discussions forward with the team and lead architectural alignment
  • Lead by example and set coding standards, review pull requests and mentor other engineers in the team
  • Empower the team to deliver mission-critical features in quality & time
  • Contribute to architectural decisions across multiple stacks
  • Closely collaborate with Product Managers, Designers, Testers and other stacks (Backend and Web)
  • Introduce new technologies, tools or processes that improve developer productivity and product quality
  • Debug performance and reliability issues across the stacks

Requirements

  • 8+ years of programming experience
  • At least 3 years of native or hybrid App development experience
  • Expert-level Dart & Flutter knowledge
  • CI/CD experience – Google Play Store, App Store deployments (fastlane, GitHub Actions or similar)
  • Experience with Unit and Golden Tests
  • Experience of performance optimisation and profiling (using Flutter DevTools)
  • Mobile native experience – iOS or Android
  • Experience with monitoring tools – Firebase Crashlytics, Sentry, DataDog etc.
  • Figma knowledge
  • Experience using AI (e.g. Copilot or Cursor) to speed up coding experience
  • Experience with Backend development
  • Mobile automated testing
  • Excellent problem-solving
  • High autonomy and ownership
  • Strong communicator
  • Team player

Nice to have

  • Experience in Web Development
  • DevOps experience (e.g. CI/CD pipelines, AWS)
  • gRPC experience
  • Firebase experience
  • Open-source experience

What we offer

  • Hybrid working
  • Fresh fruit every day
  • Sports courses
  • Free access to code.talks
  • Exclusive employee discounts
  • Free drinks
  • Language courses
  • Laracast account for free
  • Company parties
  • Help in the relocation process
  • Mobility subsidy
  • State-of-the-art technology
  • Central Location
  • Company pension
  • Dog-friendly office
  • AY Academy
  • Feedback Culture
  • Job Bikes
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