Back End Engineer - Core Java

Stellenbeschreibung:

Senior Software Engineer – Java (Networking Focus)

About the company

A data integration platform provider connecting supply chain partners and systems across formats and technologies, serving thousands of customers across Europe. The platform combines real-time integration, automation, and data quality control to support AI-driven and cross-company data flows.

Role overview

The Engineering department is expanding its data platform, data network, and connected data products. This role sits within backend engineering, focused on network-layer and integration systems, working alongside senior engineers on low-level networking infrastructure, data transport, and platform scalability. The team actively uses AI as a force multiplier, both for coding and for rethinking engineering workflows.

What you'll do

Develop, test, and deploy core backend components of the data platform, with a focus on performance, reliability, and scalability
Design and implement network-layer solutions in Java, including HTTP tunnelling, TCP/IP communication, and Netty-based pipeline architectures
Build and maintain load balancing strategies for distributed, high-availability systems
Design integrations combining cloud systems with on-premises data sources
Contribute to technical designs and participate in code reviews
Integrate AI tools into the engineering workflow to accelerate development, automate repetitive tasks, and improve code quality
Collaborate with QA and product teams on reliable, high-quality releases

What you bring

Around 3-6 years of backend development experience with strong hands-on Java skills
Solid understanding of Java networking internals, including NIO, sockets, HTTP/HTTPS tunnelling, and proxy protocols
Practical experience with Netty or similar async frameworks (Vert.x, gRPC), with ability to reason about event loops, channel pipelines, and non-blocking I/O
Knowledge of load balancing concepts: L4/L7, connection pooling, health checks, failover strategies
Strong debugging skills, particularly with low-level networking or concurrency issues
Experience with test automation (JUnit, Mockito or similar)
Hands-on experience with at least one database (PostgreSQL, Oracle, MSSQL, MySQL, or MongoDB)
Understanding of integration protocols: HTTP/HTTPS, REST, WebSocket, or gRPC
Confidence with concurrency and multithreading in Java
Some exposure to asynchronous messaging (Kafka, AMQP, MQTT)
Proactive attitude toward AI-augmented engineering
TypeScript familiarity is a plus but not required
Clear English communication; German is a welcome plus but not required

What's on offer