Kleinanzeigen reaches 36M+ monthly users and is Germany’s leading online classifieds market. We are a sustainability-focused platform where you won't just write code; you will power the services that bridge our high-traffic backend with seamless user experiences.

Joining the Edge team means working on the bedrock of Kleinanzeigen, dealing with high-throughput, low-latency and highly-efficient services that require a 'you build it, you run it' mindset, offering you deep exposure to modern infrastructure and platform architecture.

Job Requirements

What You’ll Own

As a Backend-Heavy Full Stack Engineer, you’ll be a central driver for the services that power user privacy and media delivery at scale.

You will own the full development lifecycle: from design and implementation to deployment and maintenance.

Your impact will include

1. Core Systems Architecture: Designing and scaling critical microservices using mostly Java and Spring Boot that support 36M+ monthly users.
2. Full Lifecycle Responsibility: Applying "build it, run it" mentality—you aren't just writing code; you’re ensuring robustness, scalability, and observability in production.
3. End-to-End Delivery: Crafting seamless user experiences by integrating our robust backend APIs with high-quality, maintainable frontends in TypeScript and React.
4. Strategic Engineering: Driving improvements in our development practices, testing standards, and CI/CD pipelines to keep our team velocity high and our systems healthy. For frontend components, you will maintain high standards using tools like Vitest and Playwright.

Our Tech Toolbox We believe in picking the right tool for the job. Our core environment is built on modern technologies, including:

- Backend: Java, Spring Boot, Golang, python
- Frontend: NextJs, React, TypeScript
- Infrastructure & Messaging: AWS, Kafka, CloudFormation, Kubernetes





We value technology-agnostic engineers who are comfortable navigating this stack and are open to learning new technologies as our systems evolve. How We Work
- Autonomy: We operate in a highly autonomous, cross-functional environment where teams own their services end-to-end.
- Methodology: We follow Agile methodologies with a focus on code quality, pair programming, and CI/CD best practices.
- Balance: We work in a hybrid configuration that values flexibility, deep focus time, and collaborative problem-solving.

Job Responsibilities Who You Are

- Architectural Mindset: You have proven experience building systems at scale (load balancing, service discovery, dynamic routing, circuit breakers). You understand not just how to build features, but how they perform under load.
- Owner’s Mentality: You seek out challenges, take the lead on troubleshooting complex production issues, and are proactive in proposing long-term technical solutions.
- Technical Mentor: You elevate the engineers around you through thoughtful code reviews, collaborative pair programming, and a commitment to sharing best practices.
- Effective Communicator: You can navigate trade-offs between speed and technical debt and explain your decisions clearly to the wider team.
- Tech Stack: You have strong experience in Java/Go, and you are comfortable balancing that deep backend work with frontend execution using React/TypeScript.

Job Benefits We believe that doing great work requires an environment that supports your professional and personal well-being. Here is what you can look forward to:

- Competitive compensation package
- A unique position in an international and dynamic environment
- Opportunity to shape the way we work. Your feedback and opinions are valued at all levels of the organization
- The chance to be a key player in a growing, highly skilled team
- Great colleagues and a healthy working environment
- Benefits like private health insurance.
- Career development, including individual training budget.
- Versátil benefits program (transport, restaurants, child-care, etc)
- 28 days of holidays

📌 Full Stack Engineer (Barcelona)
🏢 Adevinta
📍 Barcelona