Principal App Engineer (m/f/d) - App & Web | Relocation Offered

Principal App Engineer (m/f/d) – App & Web

Hamburg, Germany

About Company

ABOUT YOU is one of the largest online retailers for fashion and lifestyle in Europe and the leading provider of a personalized shopping experience on smartphones, with over 13 million active customers. In the award‑winning ABOUT YOU app and on aboutyou.com, customers across 26 European markets can find inspiration and a range of around 750,000 items from nearly 4,000 brands.

Position Overview

We are currently looking for a skilled Principal App Engineer (m/f/d) to assume leadership responsibilities and 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.

Responsibilities

• 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; think through changes deeply and be responsible for the implementation across all stacks
• Gain significant exposure to other teams, such as Shop Backend and Web stacks, 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

Qualifications

• 8+ years of programming experience, with 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 with 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: You can solve conceptual, non‑standard problems and exercise solid judgment based on analyzing multiple sources of information
• High autonomy and ownership: You are motivated, take matters into your own hands, and can lead a complex project or process with little oversight from your manager
• Strong communicator: You can communicate transparently, honestly, and effectively with both technical and non‑technical stakeholders (e.g. Product, Design)
• Team player: You actively share knowledge, inspire other team members, and aim to fulfill team goals

Will be a plus

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

What we offer

• Hybrid working
• Company pension plan
• Fresh fruit every day
• Sports courses
• Exclusive employee discounts
• Free drinks
• Language courses
• Company parties
• Help in the relocation process
• Mobility subsidy
• State‑of‑the‑art technology
• Central location
• Flexible working hours
• Dog‑friendly office
• AY Academy
• Feedback culture
• Job bikes

Additional details

We take responsibility for creating an inclusive and exceptional environment where all genders, nationalities and ethnicities feel welcomed and accepted exactly as they are. We believe that a diverse workforce essentially contributes to the ABOUT YOU culture. In order to maintain talent and diversity, we emphasize the care for physical health, mental health and overall well‑being. Our values and work ethics essentially contribute to our brand mission: empower acceptance and shape an inclusive, fair and circular fashion culture.

We are looking forward to receiving your application – preferably via our online application portal! Thus, we can ensure a faster process and for you it is very easy to upload your application documents. :-)