Principal Mobile Apps Platform Engineer

Overview

As Principal Software Engineer, you will lead the Server-driven UI platform powering Autotrader’s UK #1 car buying app. You’ll steer architectural scalability, performance, and long-term maintainability across mobile apps, while mentoring engineers and guiding cross-team decisions. You’ll help evolve our backend Kotlin services and the client-side framework to enable online vehicle purchasing at scale. Join a collaborative tech community shaping a high-impact, consumer-focused product.

Pay / Benefits

• 60,000–80,000 salary
• annual 10% equity in shares
• 28 days holiday + bank holidays
• private medical cover
• pension scheme (7% employer, 5% employee)
• car salary sacrifice

Responsibilities

• Provide technical leadership for the mobile platform and Server-driven UI framework
• Drive architectural scalability, performance, and maintainability across mobile apps
• Guide system design and architecture decisions
• Mentor and coach engineers, promoting best practices across teams
• Develop and evolve backend Kotlin services to support the UI framework
• Support high-quality, scalable delivery by engineering teams

Key requirements

• Kotlin Multiplatform (KMP), Gradle, Spring Boot
• Extensive experience building iOS and/or Android apps (Swift, Xcode, Instruments or Kotlin, Jetpack, Android Studio)
• Strong understanding of unit testing, RESTful API design, and regression test automation
• Experience mentoring engineers and advocating best practices across a team

• collaboration
• knowledge sharing
• mentoring and coaching
• Kotlin Multiplatform (KMP)
• Gradle
• Spring Boot