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Zalando Lounge Logo Zalando Lounge · IT - Software Development

Senior Principal Software Engineer

Germany, Berlin · Job Posted January 23, 2026
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Job Description

As a Senior Principal Engineer - React Native in the Client Foundations team, you will support our technical vision and strategy for the architecture that powers our Android, iOS and Web applications for 50M+ active customers. This team is the backbone of our customers’ experience, responsible for developing and maintaining best-in-class, high-performing platform infrastructure for Android and iOS, including our underlying Rendering Engine framework. We empower developers with robust tooling, ensure smooth production operations, and establish the testing best practices that keep the Zalando Fashion Store running at scale. This is a pivotal role in Zalando’s strategic migration to React Native. You will jump into the most complex engineering challenges to ensure our transition is scalable, secure, and built for the future.

Job Responsibility

  • Solve the Most Complex Engineering Challenges in Zalando’s React Native Migration
  • Champion a Performance-First Culture
  • Deliver Best-in-Class UI Experiences
  • Elevate Engineering Excellence and Mentorship

Requirements

  • Extensive experience developing large-scale React Native applications, with deep architectural fluency in the new React Native architecture, including Fabric, TurboModules, and JSI
  • Possess 'full-stack' profiling capabilities, with the proven ability to debug the entire stack from a React component re-render down to specific C++ JSI bindings or native modules in Swift/Objective-C and Kotlin/Java
  • Expert-level proficiency with native tooling, specifically Xcode Instruments and Android Studio Profilers, to identify main thread bottlenecks and memory leaks
  • Proficient in advanced JS profiling using React Native DevTools and the Memory tab to analyze allocation timelines and detect JavaScript-based memory leaks
  • Approach engineering with a performance-first design mindset, knowing precisely when to use tools like react-native-reanimated and how to optimize feature-rich user interfaces
  • History of establishing a culture of performance optimization, including setting performance budgets, integrating monitoring into CI/CD, and spearheading internal training programs
  • Strategic communicator and mentor, able to guide experienced engineers on complex debugging techniques and clearly explain architectural trade-offs to both technical and non-technical stakeholders

What we offer

  • Employee shares program
  • 40% off fashion and beauty products sold and shipped by Zalando, 30% off Lounge by Zalando, discounts from external partners
  • 2 paid volunteering days per year
  • Hybrid working model with up to 60% remote per week
  • Work from abroad for up to 30 working days a year
  • 27 days of vacation a year to start for full-time employees
  • Relocation assistance available (subject to prior agreement)
  • Family services, including counseling and support
  • Health and wellbeing options (including Wellhub, formerly Gympass)
  • Mental health support and coaching available
  • Drive your development through our training platform and biannual peer-to-peer review
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