Full Stack Developer - Senior

Pratical information

No freelance role!
36 hours per week
Office presence (Amsterdam) is needed on 1 or 2 days per week. This is often on Donderdag but can be discussed within the team.
CV's can be submitted in Dutch.
Dutch speaking is required for this position.

If equal pay applies to the assignment, please refer to the collective bargaining agreements listed below and the corresponding pay scale applicable to this role. Suppliers must take this into account in advance when determining the rate. Retroactive rate adjustments based on these collective bargaining agreement provisions will not be accepted.
• PLB collective agreement: PLB Collective Agreement for Production and Supply Companies - FNV
• Vattenfall company collective agreement: Vattenfall Company Collective Agreement 2025-2026
• The position in this request falls within scale: 10.

Full Stack Developer - Senior

Duties:
The Full-Stack Developer is a web engineer or web developer that deals with the front-end and back-end (and everything in-between) of an application or website. The Full-Stack Developer can work with any stack—mobile, web, or native applications. The Full-Stack Developer writes both front-end and back-end code; Designs user interfaces on web pages; Creates databases and servers for functionality; Ensures cross-platform optimization (e.g., laptops, tablets, smartphones); Has a high-level understanding of the organization’s systems and processes; Detects errors in the front or back ends; Maintains good communication with the UI/UX Developer and other team members regarding matters such as user-experience issues and design rationale; Oversees a development project from start to finish.
Key Responsibilities
Design, build, and maintain backend services using .NET on Azure
Write clean, maintainable, and well-tested code with proper documentation
Make informed technical decisions (performance, scalability, cost, reliability)
Implement event-driven architectures for efficient system communication
Own features end-to-end: discovery, design, development, testing, deployment, and monitoring
Share best practices in code quality, security, and performance
Collaborate with cross-functional teams to deliver complete solutions
You’ll also contribute to architectural decisions, balancing business needs with technical excellence, and ensuring solutions are secure, scalable, and future-proof.
Skills
7+ years of development experience, focus on back-end.
Strong expertise in .NET Core and C#, knowledge of Angular or similar framework
Hands-on experience with Azure (e.g., Functions, Service Bus, Event Grid, Key Vault, App Insights, Container Apps)
Experience with event-driven architectures and messaging systems (e.g., Kafka)
Familiar with Infrastructure as Code, CI/CD pipelines, and containers (Docker/Kubernetes)

Key Strengths
Clear and proactive communication with technical/non-technical stakeholders
Strong focus on code quality, security, and performance
Collaborative mindset with DevOps and frontend teams
Curiosity and creativity in applying new technologies such as working with Copilot/Cursor and agentic AI in general
Commitment to building impactful, future-oriented solutions

Education
Work experience in the energy sector is preferred but not mandatory.