Application Architect – Public Sector Digital Services

HumanInTech; Brussel Hoofdstad; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

HumanInTech is seeking an experienced Java software specialist with a strong background in application architecture to join delivery teams supporting public administrations in Brussels.

The role covers development, integration, and evolution of critical digital services, focusing on interoperable, secure solutions and scalable architectures. The assignment runs for 4 months, with a hybrid on-site presence in Brussels and potential continued engagement.

Qualifications

• Minimum 7 years of professional experience in Java software development.
• Minimum 5 years of professional experience in application architecture.
• Experience in complex multi-system environments and large-scale digital transformation projects.
• Proven experience in Agile delivery environments.
• Experience in public sector environments is considered an asset.

Responsibilities

• Contribute to the design of application architecture and technical building blocks in collaboration with technical leads and solution architects.
• Develop and maintain business applications and shared digital services.
• Develop application components, APIs, and web services.
• Participate in technical workshops, Agile/Scrum ceremonies, and stakeholder meetings.
• Support testing activities, technical documentation, deployments, quality assurance, monitoring, reporting, and continuous improvement initiatives.
• Collaborate with multidisciplinary teams to ensure alignment with business and technical requirements.
• Ensure adherence to security, performance, interoperability, and quality standards.
• Conduct code reviews.

Skills

Java

Spring Framework

RESTful Web Services

OpenAPI / Swagger

Keycloak

SOA

CQRS

JUnit

Mockito

Angular 20

Maven

Docker

OpenShift / Kubernetes

GitLab CI/CD

SonarQube

OAuth 2.0

Flyway / Liquibase

PostgreSQL

SQL Server

Jira

Confluence

CI/CD

Agile/Scrum

Education

Bachelor's degree

Tools

JPA / Hibernate

Job description

What you will do

You will join delivery teams working on the development, integration, and evolution of critical digital services supporting public administrations. The initiative aims to enable digital transformation through interoperable, secure, and scalable solutions that facilitate collaboration and information exchange between organisations.

Your responsibilities include:

• Contribute to the design of application architecture and technical building blocks in collaboration with technical leads and solution architects
• Develop and maintain business applications and shared digital services
• Develop application components, APIs, and web services
• Participate in technical workshops, Agile/Scrum ceremonies, and stakeholder meetings
• Support testing activities, technical documentation, deployments, quality assurance, monitoring, reporting, and continuous improvement initiatives
• Collaborate with multidisciplinary teams to ensure alignment with business and technical requirements
• Ensure adherence to security, performance, interoperability, and quality standards
• Conduct code reviews

What we are looking for

Experience:

• Minimum 7 years of professional experience in Java software development
• Minimum 5 years of professional experience in application architecture
• Experience working in complex multi-system environments and large-scale digital transformation projects
• Proven experience in Agile delivery environments
• Experience in public sector environments is considered an asset

Technical skills:

• Java >= 21 and Spring Framework (Core, JDBC, Data, Security, AOP)
• JPA / Hibernate
• RESTful Web Services
• OpenAPI / Swagger
• Keycloak, Lombok, MapStruct
• SOA, Backend-for-Frontend, CQRS
• Test-driven development (JUnit, Mockito, Spring Test, Cypress)
• Angular 20
• Maven
• Docker
• OpenShift / Kubernetes
• Git and GitLab CI/CD
• SonarQube
• NPM
• OAuth 2.0
• Flyway or Liquibase
• PostgreSQL, SQL Server and relational databases
• BPMN and UML
• Jira and Confluence
• Agile/Scrum methodologies
• Continuous Integration and Continuous Delivery (CI/CD)

Soft skills:

• Strong analytical and problem-solving skills
• Ability to quickly understand and maintain existing codebases
• Customer and solution-oriented mindset
• Team player with strong communication skills
• Autonomous, proactive, and quality-focused

The setting

This assignment runs for 4 months, starting as soon as possible and ending at the end of January 2027.

You will work in a hybrid environment in Brussels. Regular presence on site may be required depending on project needs and team activities.

You will collaborate with multidisciplinary teams across different public sector organisations.

Languages: French at expert level and English at working proficiency are required.

You can join us for this assignment as a freelancer or as an employee of HumanInTech. Same role, same team. If you join as an employee, your employment continues beyond this assignment. When it ends, we’ll work together to find your next assignment.

Location: Brussels, hybrid

Work address: Belgium

Employer / contracting party: HumanInTech

Applications close (Brussels time): October 31, 2026 at 1:00 AM

Engagement: Freelance or employed by HumanInTech

Working hours: Full-time

Experience: 6–10 years or more

Education: Bachelor's or more

Published: October 2026