01
TRCI-26-04530
Java Spring Boot Developer (Domain Services, API, Kafka, GraphQL)
Contract Java Developer (3–5 years) needed in Brussels to help deliver API-enabled Domain Services that meet business objectives. The role focuses on building and integrating services using Java and Spring Boot, exposing APIs via GraphQL/REST/SOAP, and implementing asynchronous/event-driven integration patterns with Apache Kafka and message queues. Bonus points for AWS (EKS/SQS/S3), Kubernetes, PostgreSQL, and cloud-native CI/CD, monitoring, and logging.
Position summary
- Location
- Belgium
- Workplace
- Hybrid
- Employment
- Contract
- Experience
- Minimum 3 years and Maximum 5 years
Role overview
Why This Role Matters.
Contract Java Developer (3–5 years) needed in Brussels to help deliver API-enabled Domain Services that meet business objectives. The role focuses on building and integrating services using Java and Spring Boot, exposing APIs via GraphQL/REST/SOAP, and implementing asynchronous/event-driven integration patterns with Apache Kafka and message queues. Bonus points for AWS (EKS/SQS/S3), Kubernetes, PostgreSQL, and cloud-native CI/CD, monitoring, and logging.
Your Impact
Deliver Enterprise Value
Help organisations solve complex business problems through modern technology, consulting expertise and measurable outcomes.
Collaboration
Work Across Teams
Collaborate with consultants, architects, engineers and client stakeholders throughout the project lifecycle.
Growth
Learn Continuously
Gain exposure to enterprise technologies, certifications, mentoring and real-world project experience.
Career Path
Grow With Ubique
Build a long-term consulting career with opportunities to take on greater responsibility and leadership over time.
Responsibilities
What You'll Be Doing.
Every role at Ubique contributes directly to solving meaningful business challenges for our clients.
02
Asynchronous integration patterns (e.g., event-driven architecture, message queues)
Technology stack
Tools & Technologies.
The platforms and technologies you'll use to build modern, enterprise-grade solutions.
01
Java
Required
02
Spring Boot
Required
03
GraphQL
Required
04
Apache Kafka
Required
05
REST
Required
06
SOAP
Required
07
API
Required
08
Domain Services
Required
09
Asynchronous integration
Required
10
Event-driven architecture
Required
11
Message queues
Required
12
AWS
Required
13
EKS
Required
14
SQS
Required
15
S3
Required
16
Kubernetes
Required
17
PostgreSQL
Required
18
CI/CD
Required
19
Monitoring
Required
20
Logging
Required
Requirements
Skills & Experience.
We value curiosity, collaboration and continuous learning. If you don't meet every requirement but believe you can make an impact, we'd still love to hear from you.
Essential
Required Qualifications
Java
Spring Boot
GraphQL
Apache Kafka
REST API development
SOAP service development
Asynchronous integration patterns
Event-driven architecture
Message queues
Preferred
Nice to Have
AWS EKS
AWS SQS
AWS S3
PostgreSQL
CI/CD pipelines
Monitoring in cloud-native environments
Logging in cloud-native environments
Kubernetes
Git
Azure DevOps (VSTS/Azure DevOps)
What you'll gain
More Than Just A Job.
We're committed to helping every team member grow professionally, personally and technically while working on meaningful projects.
Global Exposure
Collaborate with international clients and multicultural teams on enterprise programmes.
Continuous Learning
Expand your expertise through mentoring, certifications and hands-on project experience.
Career Growth
Take ownership, develop leadership skills and grow your consulting career over time.
Flexible Working
Hybrid and remote collaboration designed around trust and delivering exceptional outcomes.
People First
Join a supportive culture where collaboration, respect and long-term relationships come first.
Enterprise Projects
Work on meaningful technology initiatives for leading organisations across industries.
Apply
Apply for Java Spring Boot Developer (Domain Services, API, Kafka, GraphQL)
One page, about two minutes. We only ask for what we actually need to have a first conversation.