Software Engineer - Core Java

Doghouse Recruitment

Germany

1 day ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience level

Expert

Experience required

5 years minimum

Working hours

Regular working hours

Job source

www.jobfinder.de

Tech stack

Java (Programming Language) Artificial Intelligence Advanced Message Queuing Protocol Business Systems Software Quality Code Review Data Integration Software Debugging Distributed Systems Failover Data Intelligence Java Persistence API

+23 more

Junit PostgreSQL Microsoft SQL Server MongoDB MySQL Message Queuing Telemetry Transport (MQTT) Oracle (Applications) Performance Tuning Mockito TCP/IP WebSocket Jetty Multithreading Load Balancing System Availability Concurrency Spring-boot Vert.x Backend Apache Kafka Restful APIs Grpc Microservices

Requirements

Senior Software Engineer - Core Java - Java 21 monolith - Remote within Germany

About the Role

Our client is a data integration platform serving more than 2,000 customers, helping them connect business systems, automate workflows, and exchange data across cloud and on-premise environments. Their platform powers supply chains through real-time integration, automation, and intelligent data processing.

The codebase is a Java 21 monolith with no microservices and no Spring Boot. The team uses homegrown frameworks built on top of libraries such as Netty, Jetty, and JPA.

What You'll Do

Design, develop, test, and maintain production-grade backend software in Java
Build reliable, scalable, and maintainable platform capabilities
Contribute to technical design discussions and code reviews
Debug and optimize complex production systems
Collaborate closely with Product, QA, and fellow engineers to deliver high-quality releases
Use AI-assisted engineering tools to improve productivity, automate repetitive work, and enhance software quality
Take ownership of features from implementation through production

What We're Looking For

5+ years of backend Java development
Strong Core Java skills, including the ability to write Java without the Spring Boot framework
Experience with concurrency and multithreading
Experience with JUnit, Mockito, or similar testing frameworks
Experience with PostgreSQL, Oracle, MySQL, SQL Server, or MongoDB
Comfortable working in a monolithic codebase

Bonus Skills: Experience in one or more of the following is highly valued and maps to specific teams

Networking Netty, Java NIO, sockets, TCP/IP, HTTP/HTTPS, gRPC, Vert.x
Distributed Systems Kafka, AMQP, MQTT, REST, WebSocket
Platform Engineering High availability, load balancing, connection pooling, failover, performance optimization
AI focused

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