Senior Full-stack Software Engineer (Freelance / Project Contract)

Would you like to help build the digital applications shaping Europe?

In this role, you will take ownership of the full development lifecycle for scalable, secure, and high-quality web applications. You will operate in a dynamic, international environment where your code directly makes an impact.

Key Responsibilities

- End-to-End Development: Design and build modern front-end interfaces alongside robust back-end services (from UI design to database interactions).
- Architecture & APIs: Architect scalable systems and develop secure RESTful APIs.
- Security & Performance: Implement data and security standards (OAuth 2.0, JWT, input validation) and optimize applications for cross-browser and cross-device performance.
- Cloud & DevOps: Deploy and manage applications on cloud platforms using CI/CD pipelines and containerization technologies.
- Quality & Optimization: Write clean, test-driven code (unit/integration testing), analyze processes to troubleshoot issues, and maintain clear technical documentation.

Profile & Technical Expertise

- Back-End: Strong experience with Java or Node.js, Spring Boot, Hibernate, and relational databases (PostgreSQL, Oracle).
- Front-End: Deep proficiency in JavaScript, HTML, CSS,



and modern frameworks (Angular, React, or Vue).
- DevOps & Cloud: Hands-on experience with Docker, Kubernetes, cloud services (AWS/Azure), and Git workflows.
- Methodology: Familiar with Agile/Scrum, Spec-Driven Development (e.g., Claude Code, Kiro CLI), and API documentation (OpenAPI/Swagger).
- Soft Skills: Self-starter who onboards quickly, communicates clearly with stakeholders, and thrives in a multicultural team environment.

Assets / Nice-to-Haves:

- Experience in public administration or the public sector.
- Good command of French (spoken and written, level C1 or higher).

Essential Eligibility & Contract Details

- Contract Type: This position is exclusively available on a freelance or project contract basis.
- Citizenship: Candidates must hold EU citizenship (national of an EU member state) to be eligible for this role at the European Commission.
- Application Requirement:Please note: Only applications submitted with an official Europass CV will be considered.

Interested?

Does your profile match this opportunity in an international high-impact environment? Send us your application along with your Europass CV, and we will get back to you shortly!

📌 Full stack-ontwikkelaar (España)
🏢 Randstad Digital Belgium
📍 España