Senior Backend Java Engineer

## About the role
As a Senior Java Developer, you will help build reliable, scalable software that directly supports the quality and continuity of digital services. You will work on complex backend solutions, contribute to technical decisions, and help the team deliver resilient systems.
This role combines hands-on development with senior-level input in collaboration, quality, and technical direction. In this part-time position, you will make an impact on architecture, performance, and maintainability, while also supporting the growth of other developers.
## What we offer
- A salary range aligned with seniority and part-time availability; competitive employment conditions
- A flexible part-time schedule of 32 hours per week
- Room for professional development and knowledge sharing
- A challenging environment with complex technical problems
- A competitive benefits package
## Responsibilities
- Develop and maintain backend functionality in Java, with an emphasis on scalability and reliability
- Translate functional requirements into technical solutions and safeguard technical quality
- Improve the performance, security, and maintainability of existing applications
- Collaborate with product, QA, and other developers to deliver solutions on time and with care
- Review colleagues’ code and coach team members on best practices
- Identify technical risks and actively contribute to architecture decisions
## Requirements
- At least 5 years of experience as a Java Developer or in a similar backend role
- Strong knowledge of Java and common backend principles
- Experience with REST APIs, data modelling, and relational databases
- Familiarity with software testing, code reviews, and CI/CD practices
- Good command of the Dutch language, both spoken and written
- HBO or WO level of thinking, preferably in Computer Science or a comparable field
## Nice to have
- Experience with Spring Boot
- Knowledge of cloud environments such as AWS, Azure, or GCP
- Experience with microser.