Senior Backend Engineer
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Senior Back-End Software Engineer (Java / Microservices)
Contract/freelance - hybrid in Brussels
Remit
- Develop and maintain back-end web applications, server-side modules, and core business logic
- Design, build, and secure RESTful APIs and web services (using OpenAPI/Swagger specifications)
- Design and implement relational database components, schemas, complex SQL queries, and data pipelines
- Integrate user-facing elements created by front-end developers with server-side logic
- Apply data and security best practices, including input validation, authentication/authorization, and compliant logging/monitoring
- Optimize applications for maximum speed, scalability, performance, and code integrity
- Write, execute, and maintain automated unit and integration tests (JUnit, Mockito) integrated into CI/CD pipelines
- Set up, query, and utilize Application Performance Monitoring (APM) tools to troubleshoot incidents and optimize lower environments
- Perform code reviews, technical onboarding, mentoring, and effort estimation
- Lead Agile/Scrum development teams of 5 to 10 members where required
- Author clear technical documentation and administrative progress reports
Skills
- Languages & Frameworks: Proficiency in Java (Spring Boot, Hibernate, JEE, EJB) as well as PHP, Python, or Node.js
- Application Servers & Messaging: Hands-on experience with WebLogic, EJB, and Apache Kafka
- Databases: Advanced experience with relational databases (Oracle, PostgreSQL, MySQL, PL/SQL) and NoSQL stores (MongoDB, CouchDB, CosmosDB)
- API Management: Experience with API Gateways, Postman, and RESTful web service architecture
- Containerization & Cloud: Proficiency with Docker, Kubernetes, and basic cloud back-end configurations (serverless functions, storage accounts)
- Build & CI/CD Pipelines: Practical experience using Git (GitFlow), Maven, GitLab, Jenkins, Bamboo, and Nexus
- Code Quality & ALM: Usage of SonarQube, SonarLint, HP Fortify, Jira, Bitbucket, and wikis
- Monitoring & Observability: Familiarity with APM tools (Dynatrace, Splunk, Elastic APM) and OpenTelemetry
Desirable
- Knowledge of business workflow orchestration engines (e.g., Camunda, Activiti)
- Experience applying AI tools to coding (e.g., Amazon Q, Kiro)
- Industry certifications such as AWS Certified Developer Associate, Azure Developer Associate, or CKAD
- Knowledge of public grants management, audit processes, or open-source reusable frameworks
For immediate consideration, please send me your latest CV
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