Senior/Principal Fullstack Engineer (m/f/d)

A career driven by you. Join AutoScout24 Group and experience life in the fast lane. We’re not just leading the market; we’re creating it. We’re constantly innovating, evolving and transforming things for our customers. We’re driven, ambitious and determined to do our best work, together. For a career that doesn’t stand still, where you can put your ideas in the driving seat and change the way the world moves, join our global community. 

We're hiring a Senior or Principal Fullstack Engineer to join our Search Funnel team at AutoScout24 – the team behind the core buyer journey. This role is about real ownership: you’ll work on high-traffic systems, shape key parts of our user experience, and contribute to critical business outcomes. 

You’ll be deeply involved in architecture, implementation, and mentorship – all while driving quality, performance, and scalability across the stack. 

What you’ll do

• Lead the development of fullstack features using React, TypeScript, Node.js, Java, Next.
• Architect and maintain a modular monolith that’s clean, scalable, and built to last.
• Optimize frontend performance with a strong focus on Core Web Vitals and usability.
• Design backend services that are efficient, observable, and production-ready. 
• Drive A/B experimentation, performance measurement, and data-informed decisions.
• Contribute to strategic technical decisions, clean code standards, and long-term system health.
• Mentor engineers across the team and foster a high-performance engineering culture. 

Our Tech Stack 

• Frontend: React, TypeScript, Zustand…
• Backend: Node.js, Java, REST APIs
• Infrastructure: AWS (EC2, S3, SQS, etc.), CI/CD via GitHub Actions
• Observability: Datadog
• Other: Internal experimentation platform, analytics tooling, feature flag systems 

What you should bring

• 8+ years of hands-on software development experience with production systems.
• Deep expertise in JavaScript/TypeScript, React, and Node.js.
• Solid backend knowledge in Java and distributed systems (Scala is a plus).
• Experience building and running high-traffic applications in a product-focused environment.
• Strong understanding of frontend performance, SEO, and Core Web Vitals.
• Proven experience working with modular monoliths.
• Comfortable working with experimentation, feature flags, and data-driven iteration.
• Clear communicator and natural mentor, capable of guiding technical decisions and team growth.
• Experience leveraging AI, Generative AI (GenAI) to enhance engineering productivity, automate repetitive tasks, and optimize workflows. Candidates should demonstrate the ability to integrate AI-driven solutions into their daily work — such as code generation, debugging, reviews, documentation, and decision support—to improve efficiency for themselves and their teams. A proactive approach to exploring and implementing AI tools that drive innovation and streamline development processes is highly valued. 

Nice to Have

• Experience in marketplace platforms or high-visibility consumer-facing products.
• Familiarity with frontend architecture at scale: routing, state, modular UI design.
• Contributions to frontend or backend tooling, testing strategies, or performance profiling. 

A culture of growth  

With over 50 nationalities represented, we’re proud to welcome people of all backgrounds to our growing community, and we’re always finding new ways to help people feel welcomed and included. Here, you’ll have the tools, training and support you need to work in a way that suits you, learn new skills and reach your potential.  

For a career where you can drive our business and shape your future, apply now.