Brainsquare is a solution provider specialized in designing, building and managing enterprise application landscapes. We operate at the intersection of application development, integration and collaboration platforms, combining hands-on engineering with structured delivery.
Our teams work in long-term environments where we take ownership in scaling, stabilizing and evolving complex systems
Within one of our dedicated enterprise environments in Brussels, where we are actively scaling and evolving the application landscape, we are looking for a Senior Java Software Engineer to strengthen our team.
This is a long-term setup where we operate as part of a broader ecosystem, combining development with ongoing ownership of the applications.
You will contribute to both the development of new capabilities and the continuous improvement of existing applications
This role goes beyond pure development - it requires someone who is comfortable working in a build & run environment, with a strong sense of ownership.
You will:
Contribute to and challenge functional analysis and specifications
Design, develop, and maintain Java-based applications
Ensure code quality through reviews and structured delivery practices
Test and validate developments before user acceptance
Analyze incidents, identify root causes, and implement sustainable solutions
Maintain and improve existing systems and documentation
Support business users and ensure application continuity
Contribute to support processes, reporting and availability monitoring
Collaborate closely with both IT and business stakeholders
Participate in support rotations when required
We are looking for a senior profile who combines technical depth with autonomy and reliability.
5+ years of experience in Java backend development
Strong experience with Java and Spring ecosystem
Experience with relational databases (e.g. SQL Server)
Familiar with application servers (WildFly, Glassfish, …)
Experience with integration patterns and technologies (REST, SOAP, messaging such as ActiveMQ)
Experience with build & deployment tooling (Maven, Jenkins, Git)
Comfortable working in Agile environments
Experience in support-driven contexts (incident handling, bug fixing, improvements)
Understanding of security best practices (OWASP, OAuth, JWT, …) is a plus
Exposure to Docker, Kubernetes, or cloud platforms is a plus
English (mandatory)
Dutch or French (at least one)
Ownership and accountability
Pragmatic and solution-oriented thinking
Ability to operate independently within a team setup
Clear communication with both technical and non-technical stakeholders
Structured way of working under pressure
Long-term involvement in complex enterprise environments
Work within a team that combines development, integration and operational ownership
Direct impact on how applications evolve and scale
A straightforward and transparent way of working
If you are looking for a role where you can combine technical depth with real ownership, we would be happy to connect.
Empowering partnerships in times of constant technological evolution.
As a Managed Services Partner in Application Development & Integration, we design, develop and manage complex and critical application landscapes.
No matter where you are in your journey, as strategic problem solvers, we’ll partner with you to provide the expertise and practical plans you need to successfully navigate the now and move your business forward.
Our approach combines the best of both worlds: proximity through on-site support that is integrated with in customer’s team, complemented by global resources. To deliver tomorrow’s advantage today, by being fully committed to everything we do.
