Principal Mobile Apps Platform Engineer

Autotrader

About us You've probably heard of Autotrader, but do you know what we're all about? We're the most trusted, most visited automotive marketplace in the UK. A heritage brand and a tech innovator. We bring together vehicle buyers and sellers to give them real choices. 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.    At our core, we’re all about people. We go our own way while embracing diversity and celebrating our differences. We dedicate ourselves to the idea that we work better together.  Autotrader is a beautiful, surprising and vibrant place to work. We might not be for everyone, but we could be perfect for you.  About the job We’re looking for Principal Full Stack Engineers to join us! Our technology teams combine a diverse set of technologies to meet the needs of our users, handling millions of requests a day across over 600 systems. 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. All of this runs on our cutting edge cloud delivery platform, facilitating over 60k releases to production a year. We’re a close-knit tech community where collaboration and knowledge sharing are at the core of what we do. Regular pair programming, code reviews, and stand-ups ensure that our engineers stay connected and aligned. 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. We’re looking for people who are passionate about technology, thrive in a collaborative environment, and have a genuine curiosity about solving complex problems. What we’re looking for: * 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 * Ability to architect and design complex, distributed systems that are scalable, maintainable, and performant * Experience with modern front-end technologies (e.g., React or Angular, TypeScript/Modern JavaScript), along with proficiency in building RESTful APIs and web services. * Strong knowledge of relational databases (SQL), along with experience working with document-based storage solutions (e.g., MongoDB) * Experience with Kafka or other event-driven architectures * 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. These will be used as part of our selection criteria, to determine if we progress your application further Benefits We’re offering a salary of £60,000 – £80,000, plus an additional 10% of your salary awarded to you in shares each year. These awarded shares will become yours in yearly instalments over the next three years, and you can choose to either sell them or keep them as shares. And you'll receive 28 days holiday, plus bank holidays and comprehensive private medical cover.  That’s not all. 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 spend a minimum of 3 days a week in the office with your team, focused on collaboration and connection. 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. #LI-CI1 #LI-Hybrid

Autotrader

About Autotrader You’ve probably heard of Autotrader, but do you know what we’re all about?   We’re the UK’s leading automotive marketplace, a heritage brand, and a tech darling of the stock market. We bring together vehicle buyers and sellers to give them real choices. 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.    At our core, we’re all about people. We go our own way while embracing diversity and celebrating our differences. We dedicate ourselves to the idea that we work better together.  Autotrader is a beautiful, surprising and vibrant place to work. We might not be for everyone, but we could be perfect for you.  About the role We're looking for Principal Software Engineers to help us build a technology platform for more than just the needs of Autotrader.co.uk. Utilising our public-facing web services and additional external data sources means that we'll be able to power businesses across the automotive industry. Spring Boot, Apache Solr, Cloud SQL and Apache Kafka power our platform and process millions of events per day. As a team, our software developers are responsible for ensuring service availability and responsiveness continue to improve. They work on systems that handle thousands of requests per second, with sub-100 millisecond response times, servicing requests from over 50 client applications. Our tech community value collaboration and teamwork. Interactions such as pairing, code reviews and regular stand-ups mean our software developers stay connected. Our principal engineers play a visible and vital role, are comfortable talking about system design and architecture, and know how to get the best out of our teams and our technology platforms. You might assume that our name, "Autotrader," means you need to be a car enthusiast to work here. But that's not the case. We're looking for people who are passionate about their work and thrive in a collaborative environment. WHAT WE'RE LOOKING FOR * A thorough understanding of Java and the JVM  * Knowledge of server-side frameworks such as Spring * Web application design and RESTful API know-how * A structured approach to programming and testing, such as TDD * Proven experience mentoring, coaching and sharing technical expertise  * Architectural and system design knowledge   * Experience leading and delivering technical projects * SQL/Relational databases * Document/Map based storage (eg: MongoDB) * Working with Kafka messaging/streaming BENEFITS AND MORE We’re offering a salary of £60,000 – £80,000, plus an additional 10% of your salary awarded to you in shares each year. These awarded shares will become yours in yearly instalments over the next three years, and you can choose to either sell them or keep them as shares. And you'll receive 28 days holiday, plus bank holidays and comprehensive private medical cover.  That’s not all. 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 spend a minimum of 3 days a week in the office with your team, focused on collaboration and connection. 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. #LI-EC1 #LI-Hybrid

Tripadvisor

About Tripadvisor  The Tripadvisor Group connects people to experiences worth sharing, and aims to be the world’s most trusted source for travel and experiences. We leverage our brands, technology, and capabilities to connect our global audience with partners through rich content, travel guidance, and two-sided marketplaces for experiences, accommodations, restaurants, and other travel categories. The subsidiaries of Tripadvisor, Inc. (Nasdaq: TRIP), include a portfolio of travel brands and businesses, including Tripadvisor, Viator, and TheFork. The Tripadvisor Experiences Engineering team is distributed across Europe and is responsible for the platform, mobile apps and all their supporting infrastructure. We run the systems that help operators build their businesses and those which enable third parties to utilise our inventory. We provide the tools which help our customer services team provide world class service to travellers and operators internationally. About the role We're looking for a Principal Product Engineer who pairs deep engineering craft with strong product instincts. You'll work across the stack - mobile, web, backend - wherever the highest-leverage problem happens to live that quarter. You don't wait for a perfectly scoped ticket; you partner with product, design, and data to figure out what's worth building, then ship it end-to-end. We expect breadth. We also expect real depth in the mobile app ecosystem - our customer-facing experiences live there. But we're not hiring a mobile only specialist. We're hiring a generalist with mobile chops who can lead an iOS architecture review on Tuesday and untangle a backend latency regression on Wednesday.   What you'll do * Identify, scope, and ship the changes that move business metrics - across mobile, web, services, and data layers * Architect long-lasting systems that hold up under real production conditions: performance, reliability, scalability, offline behavior, consistency * Lead technical design reviews across teams, weighing trade-offs not just in code but in product impact, time-to-ship, and operational cost * Drive operational maturity wherever it's weakest - release management, observability, incident response, performance monitoring - including in the mobile apps * Partner with PMs, designers, and engineering leaders to shape what we build, why, and in what order; you're a peer in those conversations, not a downstream implementer * Set the technical bar for the org by example: write the prototype, prove the pattern, then teach it * Communicate trade-offs clearly to engineers, product partners, and senior stakeholders   What we're looking for * 10+ years of software experience, with significant time still spent hands-on in code - track record of shipping product-impacting work end-to-end, not just owning a layer * Real depth in the mobile app ecosystem (iOS and/or Android, with strong fluency in Swift and/or Kotlin and the surrounding ecosystem - offline sync, push, auth, persistence, networking, REST/GraphQL) - and credible breadth beyond it * Demonstrated breadth: you've worked seriously in at least one of {web frontend, backend services, data/infra, platform tooling} alongside mobile, and can hold your own in code review there * Strong product judgment: you've made calls about what not to build, and can defend them with evidence * Comfort troubleshooting in production across stacks - crash analysis, latency tracing, release-health debugging * Excellent cross-functional collaboration; you make the people around you better   Nice to have * Background in marketplaces, bookings, or other transactional consumer products * Time spent close to data - experimentation, analytics instrumentation, or ML-adjacent work   Our Cultural Pillars: Traveler first We exist to create value for our customer, the traveler. We enable our suppliers and partners to unlock this value. Their collective behaviors and insights are what drives us.  Execution is our edge We act fast, experiment, learn from failure, iterate, and improve the solutions of tomorrow across every aspect of our business. Our execution is agile, data-driven, prioritised, and built to scale. We assume no problem is someone else’s problem and finish what can be done today, knowing tomorrow will bring fresh challenges.  We succeed together The best outcomes are driven by empathic, humble, and diverse subject matter experts working toward shared goals. We collaborate relentlessly, challenge assumptions, give actionable feedback, and set each other up for success through empowered teams with a clear charter. We transparently take ownership of our growth, individually and as a team. We celebrate the quality of our effort, our learnings, and our collective achievements.     We strive to create an accessible and inclusive experience for all candidates. If you need a reasonable accommodation during the application or the recruiting process, please make sure to reach out to your individual recruiter or our team at AccessibleRecruiting@tripadvisor.com. If you have any additional questions about careers at Tripadvisor you can email us at recruitment@tripadvisor.com. We have all the answers!   #LI-SM1 #LI-Remote #LI-Hybrid