Senior Software Engineer - Java

Position Overview:

This is a vacancy for a hybrid or on-site role at our HQ in Tutzing (South of Munich) or Amsterdam. We encourage applications from all qualified candidates, regardless of gender identity.

As we continuously expand and improve our Data Platform, we are seeking a
Senior Software Engineer m/f/x (
Java & Networking focus
)to join our Engineering department. This department is responsible forthe design, development, and growth of our Data Platform as well asour Data Network and connected Data Products.

We are looking for key engineering talent with deep backendexpertiseand understanding of integration & transport layerstojoin our teams.

Youwillbe responsible for designing and implementing robust, high-performance backend systems, working closely with senior engineers on low-level networking infrastructure, data transport, and platform scalability. We are a team that actively embraces AI as a force multiplier - not just for writing code, but for rethinking how we work.

Ready to make an impact?

• Developing, testing, and deploying core backend components of our Data Platform, with a focus on performance, reliability, and scalability.
• Designing and implementing network-layer solutions in Java, including HTTP tunnelling, TCP/IP communication, and Netty-based pipeline architectures.
• Building and maintaining load balancing strategies and understanding their role in distributed, high-availability systems.
• Designing integrations that combine cloud systems with on-premises data sources with a seamless operations experience.
• Contributing to technical designs and actively participating in code reviews to ensure clean, maintainable, and production-grade code.
• Actively integrating AI tools into your engineering workflow-using them to accelerateengineering, automate repetitive tasks, improve code quality, and explore solutions faster. We’relooking for curiosity and initiative here - not just the ability to rely on autocomplete.
• Collaborating closely with QA and Product teams to deliver reliable, high-quality releases.

• Around 3–6 years of experience in backend development, with strong hands-on skills in Java.
• Solid understanding of Java networking internals-including NIO, sockets, HTTP/HTTPS tunnelling, and proxy protocols.
• Practical experience with Netty or similar async networking frameworks (e.g.Vert.x,gRPC); ability to reasonaboutevent loops, channel pipelines, and non-blocking I/O.
• Knowledge of load balancing concepts - L4/L7 load balancing, connection pooling, health checks, and failover strategies.
• Strong debugging skills and a structured, solution-oriented mindset - particularly when dealing with low-level networking or concurrency issues.
• Solid experience with test automation (e.g.JUnit, Mockito, or similar frameworks) and a commitment to well-tested, maintainable software.
• Hands-on experience with at least one database technology:
  PostgreSQL, Oracle, MSSQL, MySQL, or MongoDB.
• Good understanding of integration protocols: HTTP/HTTPS, REST, Web Socket, orgRPC.
• Confidence with concurrency and multithreading in Java-thread safety, executors, reactive patterns.
• Some exposure to asynchronous messaging systems (e.g.Kafka, AMQP, MQTT).
• A proactive attitude toward AI-augmented engineering-you actively use AI tools (LLM assistants, code generation, automation agents, etc.) to improve your own productivity and the quality of your output. You think about where AI can reduce friction in your workflow, and you bring that mindset to the team.
• Familiarity with Type Script is a welcome plus,but not a requirement.
• Clear communication skills in English; sufficient German for everyday collaboration is a welcome plus, but not a requirement.

• Op…