Senior Principal Software Engineer Job at Zalando (Helsinki, Zurich, Dublin, Berlin)

Senior Principal Software Engineer

Zalando

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Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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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

Additional Information:

Job Posted:
January 02, 2026

Employment Type:

Fulltime

Work Type:

Hybrid work

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