Expert Java Backend Developer
Optimus IT Services
| Company | Optimus IT Services |
| Category | Engineering |
| Location | BE |
| Remote | — |
| Employment | Not stated |
| Level | Senior |
| Salary | Not stated by the employer |
| First seen | 2 Aug 2026 (the employer did not state a posting date) |
| Last verified | 9 Aug 2026 |
| Source | The employer's own careers page (company_site) |
Description
Location: Brussels (Hybrid or Remote Options Available)
Job Summary:
We are looking for an Expert Java Backend Developer to join a high-performing technical squad focused on building scalable, secure, and maintainable solutions for complex loan contracting systems . This is a senior-level role where you'll contribute significantly to the future architecture of critical backend services and work with modern enterprise technologies.
Key Responsibilities:
• Design, develop, and maintain robust and scalable Java backend applications using Spring Framework and related technologies
• Lead initiatives to reduce technical debt , refactor legacy code, and define future application evolution
• Collaborate with architects, developers, and product owners to ensure technical excellence and delivery of customer value
• Analyze, refine, and implement business requirements into clean, efficient, and testable code
• Ensure code quality through best practices in design, TDD (Test-Driven Development) , CI/CD , and automation
• Support the team in overcoming technical challenges and elevating engineering standards
• Contribute to the adoption of Domain-Driven Design , hexagonal architecture , and modern DevOps tooling
Required Skills & Experience:
• 6+ years of experience in Java development, with deep expertise in enterprise-level backend systems
• Proficient in Spring/Spring Boot , object-oriented programming , and software design patterns
• Experience with relational databases (Oracle) , Kafka , and enterprise integration patterns (e.g., service buses)
• Strong knowledge of SOAP and RESTful APIs
• Hands-on experience with testing frameworks , CI/CD pipelines , and tools such as:
• Git, GitLab, Jenkins, SonarQube, Fortify, Nexus
• Familiarity with Domain-Driven Design , Hexagonal Architecture , and microservices architecture
• Knowledge of TDD , code refactoring , and clean code principles
• Excellent problem-solving, debugging, and communication skills
• Fluent in English (written and spoken)
Nice to Have:
• Experience in loan or financial services systems
• Exposure to agile development environments and Scrum methodologies