Senior Fullstack Developer, Brussels

Job role

Senior Fullstack Developer.

Minimum experience

Minimum of 14 years of professional experience.

Language

English (C1) Mandatory.

Location

Brussels (on-site).

Key responsibilities

• Software Development: Design and develop high-performance, scalable applications using Java and Quarkus, ensuring that code is maintainable, efficient, and aligned with best practices.
• Database Optimization: Architect and optimize MongoDB and PostgreSQL schemas, queries, and indexing strategies to achieve high performance and scalability.
• Microservices & Messaging: Develop and scale microservices using Kafka for messaging, integrating with the ELK stack for logging, monitoring, and troubleshooting.
• Performance Engineering: Identify, analyze, and optimize system performance bottlenecks in both code and infrastructure. Ensure optimal performance through rigorous profiling, testing, and fine-tuning.
• DevOps: Expertise with DevOps and CI/CD principles, use pipelines with Jenkins, SonarQube, and Nexus, focusing on security, automation, and deployment efficiency.
• Security: Implement secure coding practices throughout the development lifecycle.
• Mentorship: Provide guidance to junior developers, sharing knowledge and fostering a culture of continuous improvement.
• Stakeholder Interaction: Work closely with product owners, architects, and other stakeholders to understand requirements, provide technical insights, and deliver effective solutions.
• End-to-End Ownership: Take full ownership of tasks from analysis through design to implementation and deployment. Be proactive in driving solutions independently, ensuring high-quality and timely delivery.
• Storage: Experience with bucket-based storage solutions, like MinIO.
• Authentication & Authorization: Knowledge of RBAC and JWT.
• Frontend: proven experience with core technologies – React (with TypeScript), webpack, modern JavaScript (ES6+); UI & Styling – Ant Design; Testing – Jest (unit/integration) and React Testing Library.

Technical skills & qualifications

• Proven experience with Java, Maven and Quarkus/Spring in building large-scale applications.
• Strong experience with Git, ideally Bitbucket.
• Strong background in MongoDB and PostgreSQL, with a focus on optimizing data access and ensuring scalability.
• Expertise in Kafka for building event-driven systems and integrating with the ELK stack for monitoring and troubleshooting.
• Deep understanding of performance optimization and profiling techniques for both code and database layers.
• Strong experience with Docker, Kubernetes, Jenkins, SonarQube, and Nexus for DevOps and CI/CD pipelines.
• Ability to implement security best practices, including secure coding, vulnerability management, and compliance.
• Solid experience in Agile methodologies with a focus on delivering high-quality software in iterative cycles.
• Exposure to performance profiling tools and security tools (e.g., Snyk, OWASP).

Interpersonal skills & proven maturity

• Excellent soft skills, including the ability to analyze requirements, communicate effectively with cross-functional teams, and take initiative and drive tasks to completion.
• A proactive and independent mindset, with the ability to work with minimal supervision and take full responsibility for end-to-end delivery.
• Not afraid to completely take over a codebase without proper handover by a previous team of developers.

Rate

505-525€/day.