Job descriptionPrincipal Full Stack Engineer - Full or Part Time We’re the UK’s leading automotive marketplace, a heritage brand, and a tech darling of the stock market. Cars may be what we're best known for but we’re also the place for pretty much everything else on wheels, from e-bikes to caravans. In the automotive world, change is a constant, that’s why we take our job of untangling the complex car-buying journey very seriously. We go our own way while embracing diversity and celebrating our differences. We’re looking for Principal Full Stack Engineers to join us! We build these systems with industry standard frameworks and tools, such as React and Angular on the front end and Java, Spring Boot, Cloud SQL and Apache Kafka on the back end. We’re a close-knit tech community where collaboration and knowledge sharing are at the core of what we do. As a Principal Engineer, you’ll play a visible, strategic role in driving system design and architecture decisions, mentoring team members, and helping our teams deliver high-quality solutions at scale. You might think that "Autotrader" means we’re looking for car enthusiasts, but that’s not the case. Strong experience working across the stack, from designing scalable back-end systems to developing responsive front-end applications You should be comfortable working with Java, Spring Boot and the Java ecosystem / JVM Strong knowledge of relational databases (SQL), along with experience working with document-based storage solutions (e.g., A structured approach to development and testing (including Test-Driven Development) with a focus on continuous delivery and automation Proven experience leading and mentoring teams, helping others grow technically while delivering high-impact projects During our application process, you will be asked two questions to help us learn more about you and how you align with our values. And you'll receive 28 days holiday, plus bank holidays and comprehensive private medical cover. You'll be enrolled in our pension scheme, where our standard contributions are 7% and employee contributions are 5%. We also have comprehensive private medical cover, enhanced family leave provisions, a car salary sacrifice scheme, share-save options, and much more. We always want to give you the support you need and help prioritise your wellbeing, that’s why we provide access to 24/7 online GP and dentist, as well as specialist support for assisted fertility, gender dysphoria, menopause, period care plans and lots more. On top of all that, our hybrid model, Connected Working, combines the best of both worlds – office and home working. You’ll have two fixed weekly office days for team collaboration and one more of your choice to suit your work-life balance. Additionally, we have our remote-first periods at set times during summer and winter. During these periods, you can work remotely anywhere in the UK and from certain locations abroad. Discover more about our hiring process and explore our Engineering Blog. Our minimum part time consideration is 22.5 hours per week.