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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