Senior Java Backend Developer | Cologne | 40% Remote

Responsibilities

• Further development of a central data distribution platform for master data
• Implementation of data interfaces via REST APIs and Kafka
• Development of scalable backend applications according to Clean Code principles
• Conception, implementation, and documentation of technical solutions
• Support and optimization of existing applications during ongoing operation
• Execution of application migrations and ensuring stable operation
• Collaboration with interdisciplinary development teams

Requirements

Due to client requirements, project-related employment is assumed.

Do you have time and interest in an exciting project?

Then we look forward to hearing from you!

Contact:

Julia Barth

Expert Candidate Relations

_____

Constaff GmbH - 100%OpenBook. Honest. Competent. Transparent.

• Very good knowledge of Java and Spring
• Experience in backend development and design of scalable applications
• Sound knowledge of synchronous and asynchronous interfaces, especially REST APIs and Kafka
• Experience with relational databases and SQL
• Knowledge of Git, GitLab CI/CD, and Maven
• Experience with Kubernetes, Helm, and YAML/JSON
• Knowledge of IntelliJ IDEA, Mockito, Grafana, and Liquibase
• Experience with JIRA and Confluence
• Interest in AI-supported development tools such as GitHub Copilot or Claude Code
• Independent, proactive, and structured way of working
• Communication skills and team orientation
• Good German and English skills

Project details

October 2026

6 months++

Cologne / 40% Remote

Project ID: 15172

Application Deadline: 03.11.2026

Dear Network,

We are looking for a Senior Java Backend Developer (m/f/d) for our client in Cologne.

? Link: https://www.constaff.com/projektbeschreibung/?positionID=15172

• Start: 2026-12
• Duration: 6 Monate
• Remote: hybrid
• Location: Köln, Deutschland, DE
• Languages: German