Senior Full Stack Developer (Symfony/PHP) | Brussels, Hybrid

About the Company

Our client is delivering large-scale enterprise technology solutions for a major European institutional environment. Working on secure, mission-critical platforms, they develop and maintain complex web applications that support thousands of users across Europe.

• Location: Brussels, Belgium (Hybrid)
• Employment Type: Full-time
• Level: Mid-Senior Level
• Work Authorization: EU nationality is a mandatory

About the Role

We're looking for an experienced Senior Full Stack Developer with strong backend expertise to join a long-term enterprise project based in Brussels .

You'll work on secure, enterprise-grade web applications using modern development practices while collaborating closely with architects, developers, and technical stakeholders. This is a hands-on engineering role with a strong focus on backend development, DevSecOps, and scalable application architecture.

This position requires on-site presence in Brussels three days per week . Remote work from outside Belgium is not permitted.

What You'll Do

• Design, develop, and maintain enterprise web applications with a strong backend focus.
• Build scalable solutions using Symfony, PHP, SQL, Python, JavaScript, and HTML .
• Develop and maintain secure CI/CD pipelines and DevSecOps practices.
• Deploy and manage applications within Kubernetes environments.
• Apply modern software engineering principles, including OOP, SOLID, and clean architecture.
• Collaborate with cross-functional teams throughout the full software development lifecycle.
• Contribute to application performance, reliability, security, and maintainability.

What We're Looking For

• Minimum 11 years of combined academic and professional experience .
• EU nationality .
• Strong hands-on experience with Symfony, PHP, SQL, Python, JavaScript, and HTML .
• Experience with Kubernetes , CI/CD pipelines, and DevSecOps practices.
• Solid understanding of Object-Oriented Programming (OOP) and SOLID principles .
• Experience building enterprise-scale applications.
• Excellent analytical, troubleshooting, and problem-solving skills.
• Strong communication skills and ability to work effectively in collaborative environments.
• Ability to obtain (or already hold) a Personal Security Clearance .
• At least one of the following certifications: Oracle Certified Professional, Java EE 8 / Java SE 17 or higher, PM² Agile, BPMN 2.0
• Ability to work on-site in Brussels, Belgium , 3 days per week .

Nice to Have

• Experience with API Platform and/or React .
• Advanced DevSecOps and CI/CD architecture experience.

What We Offer

• Long-term enterprise project.
• Opportunity to work within a highly secure European institutional environment.
• Challenging technical work using modern technologies.
• Collaborative international team.
• Stable full-time engagement with long-term career opportunities.

If you're an experienced engineer who enjoys building secure enterprise applications and wants to contribute to high-impact European projects, we'd love to hear from you...