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Front-end Back-end Java Angular Developer

Keystone Solutions · Brussels, Brussels Region, Belgium

Frontend Engineering

About this role

The Fullstack Developer will join Keystone Solutions on a consultancy mission to analyze, develop, and maintain the mypension application. The role involves working across the backend with Java 24+, Spring Boot, and Project Reactor, and the frontend using TypeScript and Angular 22+. You will implement architectural patterns like Hexagonal architecture, DDD, and CQRS while ensuring security through OIDC/OAuth2 and OWASP standards. The position requires a strong focus on testing using TDD and Playwright, as well as managing delivery via GitLab CI/CD and containers. You will work in a highly Agile environment, utilizing pair programming and short feedback loops to deliver high-quality software.

Skills & technologies

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Mission Overview:

We are seeking a talented Fullstack Developer to join our team on a consultancy mission at a client site, representing Keystone Solutions. In this role, you will analyze, develop, and maintain the mypension application, aligning with departmental standards and stakeholder needs, including organizations, citizens, and political entities. You will also contribute to the training and integration of junior team members.

Technical and Generic Competencies:

As a software developer, you will take on a Fullstack role (backend, frontend, devops). For the backend of the application, you must possess the following knowledge:

  • Java 24+
  • Spring / Spring Boot
  • Reactive programming with Project Reactor
  • Enterprise Java background: JBoss / Jakarta EE
  • SQL
  • Transaction management


For the frontend of the application, you must possess the following knowledge:

  • TypeScript
  • Angular 22+: signals, signal forms
  • Designing reusable frontend libraries / shared components
  • Translating Figma designs into working UI


For our architecture and API design, you should have a solid understanding of:

  • Hexagonal architecture (ports and adapters)
  • Domain-Driven Design
  • CQRS
  • Anti-corruption layers when integrating with external systems
  • Backend-for-frontend pattern
  • API design, OpenAPI


Regarding security, it is essential to have knowledge of:

  • Privacy by design
  • OWASP top 10
  • OIDC/Oauth2


It is important to consider the accessibility of mypension. Therefore, you should have knowledge of:

  • Designing accessible interfaces, WCAG
  • Testing for accessibility


In your role as a tester, you must master the following activities:

  • Test-driven development
  • Unit testing
  • Integration testing
  • Component testing
  • End-to-end and visual regression testing with Playwright


To manage the integration and delivery of our application, you need to be proficient with the following tools and methods:

  • Git
  • Gradle
  • Maven
  • Containers
  • CI/CD pipelines on GitLab
  • Trunk-based development


Our team employs strongly Agile-oriented methods. This means you must be able to demonstrate in-depth knowledge and experience of:

  • The Agile methodology, including pair programming


You should possess excellent communication skills and be able to collaborate effectively both within and outside the team. We work with short feedback loops and frequent integration, producing highly visual work. All these aspects require proven skills and experience.

Why Join Keystone Solutions:

As a consultant at Keystone Solutions, you will enjoy the dynamic nature of consultancy work, tackling diverse challenges across various client environments. You will experience turbo-charged learning opportunities and a commitment to your career growth within our framework. Being a

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.

Duration: 01/11/2026 - 31/10/2027 12 months

  • (full time)


Skills required:

  • Agile methodologie (o.a. pair programming). Communicatie en samenwerkingsskills. - Level: Confirmed - Most recent: Any time
  • Architectuur en API design kennis: Hexagonal architecture (ports and adapters), Domain-Driven Design - Level: Junior - Most recent: Any time
  • Backend kennis: Java 24+, Spring / Spring Boot, Reactive programming with Project Reactor, Enterpris - Level: Confirmed - Most recent: Any time
  • Frontend kennis: TypeScript, Angular 22+: signals, signal forms, designing reusable frontend librari - Level: Junior - Most recent: Any time
  • Integratie en delivery: Git, Gradle, Maven, Containers, CI/CD pipelines on GitLab, Trunk-based deve - Level: Junior - Most recent: Any time
  • Security en accessibility: privacy by design, OWASP top 10, OIDC/Oauth2, Designing accessible interf - Level: Junior - Most recent: Any time
  • Testing: test-driven development, Unit testing, Integration testing, Component testing , End-to-end - Level: Junior - Most recent: Any time


Language requirements:

Dutch or French

Level Active knowledge

English

Level Active knowledge
Ready to apply?Apply now

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