Senior .NET Backend Developer

RDT is looking for a Senior .NET Backend Developer to work on a secure certificate provisioning solution supporting device onboarding and certificate lifecycle management. The role combines hands‑on backend development with .NET, ASP.NET Core, Azure, X.509 certificates, Windows Services and DevOps. Following an initial onsite introduction, remote work is possible.

QUALIFICATIONS & COMPETENCIES Strong hands‑on experience with C#/.NET and ASP.NET Core

Experience with Azure Blob Storage, Key Vault and Application Insights

Hands‑on experience with X.509 certificates or certificate lifecycle management

Experience with Windows Services

Experience with Azure DevOps, Git and CI/CD

Good understanding of async programming, dependency injection and file handling

Experience troubleshooting applications in production / Windows Server environments

Nice to have:

Experience with OpenSSL and certificate automation

Experience with production monitoring and observability

Experience with enterprise integrations and secure credential management

AREA OF RESPONSIBILITY Develop and maintain backend services using C#, .NET 8/10 and ASP.NET Core

Develop and maintain Windows Services

Work with X.509 certificates, including generation, validation, storage and lifecycle management

Maintain integrations with Azure Blob Storage, Key Vault and Application Insights

Troubleshoot application, infrastructure and certificate-related production issues

Maintain CI/CD pipelines and deployment processes using Azure DevOps

Contribute to testing, code reviews and engineering best practices

Support requirements clarification, stakeholder coordination and production rollouts

At RDT we develop global engineering and information technology solutions that allow our clients to gain a competitive advantage in the development of projects with advanced technological components. We offer our clients agility, flexibility, excellence and a cutting‑edge approach from a sustainable and lasting perspective, positioning ourselves as a trusted strategic partner. We work in sectors such as Aeronautics, Aerospace, Automotive, Energy, Industrial, Petrochemical, Capital Goods, Consumer Goods and many more.

Our trajectory is marked by a passion for engineering in whose positive impact we believe for the resolution of our clients' and society's challenges, starting from a close reality towards an international vision.

RDT has offices in Spain, France, United Kingdom, Denmark, Portugal, Sweden, Mexico and Morocco, having carried out projects all over the world and with a global projection. We currently have a team of 1800 people, and we have an average annual growth of 18% in turnover since RDT was founded in 2006, reaching 120 million euros by 2024.

If you have questions about the position, please contact us on:

START DATE ASAP

Read what our employees think The company prioritizes the employees and creates a good, stable and healthy work environment. You are a person, not only a resource. This focus on the employees, the work-life balance and the possibilities to learn new things are great.

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