Senior Java Software Engineer

About Brainsquare

Brainsquare is an engineering-driven IT service company active in enterprise application development, integration and delivery governance.

We design, build and maintain business-critical applications for large organizations in Belgium. Our teams combine strong technical expertise with ownership and pragmatic delivery.

For a mission in Brussels, we are looking for a Senior Java Software Engineer (5+ years experience) to strengthen an enterprise application landscape.

Senior Java Software Engineer

Your mission:

As a Senior Java Software Engineer, you contribute to both project delivery and application maintenance within a business-critical environment.

You take ownership from analysis support to implementation, testing, documentation and operational follow-up.

Responsibilities

Development & Delivery

• Contribute to and validate functional analysis and specifications.

• Deliver IT changes and projects within scope, budget and planning.

• Develop new components and enhance existing applications in line with standards.

• Perform code reviews and support release management.

• Test developments before handover to key users.

• Document technical implementations and user guidelines.

Application Maintenance & Support

• Handle application tickets for owned systems.

• Perform bug fixing and root cause analysis.

• Propose structural improvements.

• Maintain documentation and implement approved enhancements.

• Support business users and define response/availability agreements.

• Participate in support rotations if required.

Collaboration

• Work closely with IT colleagues and business stakeholders.

• Report progress transparently.

• Contribute actively to team meetings.

• Propose improvements that reduce Total Cost of Ownership (TCO).

Requirements (Senior Profile)

• 5+ years of experience as Java Software Engineer

• Degree in IT or equivalent experience

• Experience working in Agile/Scrum environments

• Strong ownership mindset

• Comfortable working under deadlines

• Languages: English + Dutch or French

Technical Stack

Core

• Java (7/8/11/17)

• Spring Framework

• Microsoft SQL Server

• Glassfish 3.1 / Wildfly

• ActiveMQ / OpenMQ

• Montova ESB

• SOAP / RMI / REST

• RESTful web services

• Concurrency & multithreading

Frontend / Additional Exposure

• ReactJS, Redux, ES6

• C#

• JSON / XML

• Linux / Unix basics

Toolchain

• Maven, Jenkins

• Git / Bitbucket, Jira

• BuildMaster / Octopus

• Eclipse / IntelliJ

• SoapUI, ReadyAPI, SSMS

Nice to Have

• Kubernetes, Docker, containerization

• Cloud platforms (AWS / Azure / GCP)

• Security best practices and protocols

Security Mindset

You write clean, secure code and understand topics such as:

• OWASP vulnerabilities

• Authentication & authorization (OAuth, JWT, SAML)

• Encryption (at rest & in transit)

• API security

• Dependency and vulnerability management

Why Choose Brainsquare

• Work in a mature enterprise environment with real ownership.

• Clear scope and responsibilities.

• Professional and efficient decision-making process.

• Collaboration with experienced engineers.

• Contract options: employee or freelance.

• Start date: ASAP.

Our Selection Process

Our selection process consists of a maximum of three interviews (technical and team discussions).
After that, a decision is taken promptly. If you are ready to step into a senior role with immediate impact and clear ownership, we encourage you to apply today.