Hybrid Senior Principal Software Engineer

at Zalando

• Job title: Senior Principal Software Engineer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Android, Java, JavaScript, Kotlin, Objective-C, React, React Native, Swift
• Location requirements: Hybrid, Berlin, Germany

About the role

• Senior Principal Engineer handling complex challenges in Zalando's React Native migration. Leading performance optimization and mentoring engineers in mobile application development.

Responsibilities

• Solve complex engineering challenges in Zalando’s React Native migration
• Leverage expertise in React Native architecture to resolve challenges in massive-scale applications
• Diagnose critical bottlenecks across the entire stack
• Utilize proficiency with Xcode Instruments and Android Studio Profilers
• Establish and lead a culture of performance optimization
• Architect core app features and animations with performance as a primary consideration
• Elevate engineering excellence and mentorship for mobile domain engineers

Requirements

• Extensive experience developing large-scale React Native applications
• Deep architectural fluency in the new React Native architecture, including Fabric, TurboModules, and JSI
• Full-stack profiling capabilities, with proven ability to debug the entire stack from React component re-renders 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
• Proficient in advanced JS profiling using React Native DevTools and the Memory tab
• Performance-first design mindset, knowing 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 and integrating monitoring into CI/CD
• Strategic communicator and mentor, able to guide experienced engineers on complex debugging techniques and explain architectural trade-offs to both technical and non-technical stakeholders

Benefits

• 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, actual practice is up to each team to best support their collaboration
• 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