We're seeking a hands‐on API Developer to join our API Team in Valencia, Spain, working within the Labs Domain or another internal domain depending on the assignment. Reporting to the Platform Engineering Manager or equivalent, the role follows a hybrid working model aligned with the needs of the team. You'll turn product goals into robust technical solutions, craft high‐quality .NET APIs, champion API‐first practices, and collaborate closely with Product Owners, Architects, Security, and Platform teams to deliver reliable, scalable services.
Location
Parque Tecnológico, Paterna, Valencia, Spain
Your Mission
Your mission will be to develop and take ownership of the API surface supporting the domain's applications, enabling the team to deliver efficiently, safely, and sustainably. You will balance the need for rapid delivery with the long‐term health, scalability, and maintainability of the APIs.
What You'll Do
Design and evolve the API architecture; define contracts, versioning, security, and observability
Break down features into technical tasks and actionable work




Implement REST and/or gRPC APIs; ensure thorough testing (unit, integration, contract)
Lead or contribute to sprint planning and technical refinement
Maintain DevOps pipelines, CI/CD, monitoring, and operational readiness
Collaborate with Platform, Security, and Enterprise Architecture teams
Mentor peers and raise the technical bar across the team
Identify and mitigate technical risks, dependencies, and debt
Support incident resolution and root cause analysis
What You Bring
Strong hands‐on experience as a .NET API developer
Proven expertise designing, building, and consuming APIs (REST and/or gRPC)
Deep knowledge of API tooling: OpenAPI/Swagger, contract testing, API gateways, security best practices
Cloud experience with Azure or AWS
Experience with DevOps, CI/CD, automated testing, and observability
Strong collaboration and communication skills; able to work with DPO/EA/security teams
Awareness of secu

📌 API Developer – .NET (Paterna)
🏢 Vitrolife Group
📍 Paterna