Senior Java Developer

BE001 ONEPOINT SA; Brussel Hoofdstad; Sur place; EUR 70 000 - 110 000; Plein temps

Résumé du poste

Onepoint is seeking a Senior Full-Stack Java Developer to join our client’s development team in Belgium, designing, building and maintaining modern web applications across backend and frontend layers.

You will work with Spring Boot, RESTful APIs, and Angular, contributing to architecture, code quality, and CI/CD processes while mentoring junior developers and collaborating with product owners to deliver high-quality features.

Qualifications

• 5+ years of professional experience as a Java developer.
• Strong experience with Spring / Spring Boot and RESTful API development.
• Frontend experience with Angular and TypeScript/JavaScript.
• Experience with enterprise-level applications focusing on performance and security.
• Understanding of software architecture patterns (layered, microservices, etc.).
• Strong SQL and ORM knowledge.
• Experience with CI/CD, automated testing, and modern practices.
• Ability to work in Agile/Scrum teams.

Responsabilités

• Design, develop and maintain backend services using Java and related frameworks.
• Build and enhance RESTful APIs to support web and mobile applications.
• Develop responsive, user-friendly frontend interfaces using modern JavaScript frameworks (e.g. Angular).
• Participate in technical design and architecture discussions (performance, scalability, security, maintainability).
• Write clean, testable, and well‑documented code following best practices and coding standards.
• Collaborate closely with product owners, business analysts and other developers to refine requirements and deliver high‑quality features.
• Troubleshoot, debug and resolve complex technical issues across the stack.
• Contribute to code reviews, knowledge sharing and mentoring of more junior developers.
• Participate in CI/CD, release management and continuous improvement of the development lifecycle.

Connaissances

Java

Spring / Spring Boot

Angular

RESTful APIs

Microservices

SQL / ORM

CI/CD / Testing

Agile/Scrum

Architectural patterns

Outils

JPA / Hibernate

Spring Cloud

Kafka

RabbitMQ

OAuth2 / JWT

Description du poste

Contribute to the major transformations of companies and public actors by combining technological innovation and business expertise, serving our society and customers to help them move forward sustainably.

Your responsibilities for this function

We are looking for a Senior Full-Stack Java Developer to join our client’s development team and take a key role in designing, building and maintaining modern web applications.

You will work across the entire stack (backend and frontend), contribute to architecture and technical choices, and help raise the overall engineering standards within the team.

• Design, develop and maintain backend services using Java and related frameworks.
• Build and enhance RESTful APIs to support web and mobile applications.
• Develop responsive, user-friendly frontend interfaces using modern JavaScript frameworks (e.g. Angular).
• Participate in technical design and architecture discussions (performance, scalability, security, maintainability).
• Write clean, testable, and well‑documented code following best practices and coding standards.
• Collaborate closely with product owners, business analysts and other developers to refine requirements and deliver high‑quality features.
• Troubleshoot, debug and resolve complex technical issues across the stack.
• Contribute to code reviews, knowledge sharing and mentoring of more junior developers.
• Participate in CI/CD, release management and continuous improvement of the development lifecycle.

Your skills

• 5+ years of professional experience as a Java developer, including senior responsibilities.
• Strong experience with Spring / Spring Boot and RESTful API development.
• Solid experience in frontend development with Angular (or similar framework, with willingness to focus on Angular).
• Proven experience working on complex, enterprise-level applications (performance, security, maintainability).
• Good understanding of software architecture patterns (layered architecture, microservices, clean architecture, etc.).
• Strong knowledge of relational databases and ORM tools.
• Experience with CI/CD pipelines, automated testing and modern software engineering practices.
• Ability to work in an Agile/Scrum environment and collaborate with cross‑functional teams.

Core Technical Stack

Backend

• Java 8+ / 11+ Spring, Spring Boot Java EE / Jakarta EE (JPA, EJB, JMS, Servlet, etc.)
• RESTful web services (REST) API design and integration (JSON, XML)
• JPA / Hibernate or other ORM frameworks
• Microservices architectures (Spring Cloud / similar)

Frontend

• Angular (latest versions preferred)
• TypeScript / JavaScript (ES6+) HTML5, CSS3, SCSS
• Responsive design and UI frameworks (Bootstrap / Material / similar)

Integration & Data

• Relational databases (Oracle, PostgreSQL, MySQL, SQL Server) and strong SQL skills
• Messaging / event-driven architectures (JMS, Kafka, RabbitMQ or similar)
• API gateways and security (OAuth2, JWT, OpenID Connect)

Onepoint in a few words: In just over 20 years, Onepoint has become one of the major players in consulting and tech. Indeed, our collective has now more than 3,500 people around the world (France, Australia, Belgium, Canada, Malaysia, Morocco and Singapore). Our turnover has been multiplied by 10 in only 10 years, reaching more than 500 million euros, and aims to reach a billion euros within 4 years. As an architect of major transformations for companies and public sector players, Onepoint is building a direction and outlining future prospects in an uncertain world, by putting technological innovation at the service of its customers' and society's progress.