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Java Software Engineer

Java Software Engineer

Hybrid

Antwerp, Belgium

Freelance

07-01-2026

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Skills

Java CI/CD Organization Spring Maven Gradle CI/CD Pipelines

Job Specifications

Freelance Java Developer

For an organization in the insurance and financial services sector, we are looking for an experienced Java Developer to support a project-specific Java upgrade.

The assignment focuses on upgrading existing enterprise applications from Java 8 to Java 17 or Java 21, ensuring stability, performance, and compliance with modern Java standards.

Responsibilities

Analyse existing Java 8 applications and identify upgrade impacts
Migrate and refactor codebases to Java 17 or Java 21
Resolve compatibility issues (libraries, frameworks, deprecated APIs)
Ensure application stability through testing and bug fixing
Collaborate with architects, developers, and functional teams
Document changes and provide technical input during the upgrade process

Required Skills & Experience

Strong hands-on experience with Java (Java 8 and higher)
Proven experience with Java upgrades (8 → 17 and/or 21)
Solid understanding of JVM changes, modularity, and performance improvements
Experience with enterprise Java applications (Spring, Maven/Gradle, etc.)
Familiarity with testing frameworks and CI/CD pipelines
Experience in insurance, banking, or financial services is a strong plus

Language & Location

Dutch is mandatory (spoken and written)
Based in or able to work in Antwerp (hybrid setup possible)

About the Company

We focus on delivering high-performance and premium services to diverse organizations. ThoughtBot is a team of software engineers, programmers, technology experts and technical recruiters who work together to provide our clients with outstanding services. What we do? * IT Consultation * IT Staffing * Web Development * Mobile App Development * IT Consultation In this high-tech and digitalized world, you may be stuck in certain things. You need to analyze your current business practices, approach and standings in technologie... Know more