Senior .NET Backend Developer

Jelber; Bjerringbro; Hybrid; DKK 750,000 - 950,000; Full time

Job summary

Jelber in Denmark is seeking a Senior .NET Backend Developer to build and support a secure certificate provisioning solution for device onboarding and lifecycle management.

You will develop with .NET 8/10, ASP.NET Core, Windows Services, and Azure services, focusing on security, reliability, and integration. After an initial on-site introduction, remote work is possible.

Location: Bjerringbro, Denmark. Start: 01-10-2026. End: 20-03-2027.

Qualifications

• Strong experience with C#, .NET 8/10, ASP.NET Core, and Windows Services.
• Experience with Azure Blob Storage, Key Vault, Application Insights, and Azure DevOps.
• Knowledge of X.509/other certificates, and certificate lifecycle management.
• Strong understanding of async programming, dependency injection, file handling, and troubleshooting.
• Experience with Git, PowerShell, CI/CD pipelines, and Windows Server environments.

Responsibilities

• Develop and maintain .NET 8/10 backend services, Windows Services, and ASP.NET Core APIs.
• Support X.509/other certificate generation, validation, storage, and lifecycle management.
• Maintain integrations with Azure Blob Storage, Key Vault, and Application Insights.
• Troubleshoot production issues across application, infrastructure, and certificate-related workflows.
• Maintain CI/CD pipelines, deployment automation, and release processes using Azure DevOps.
• Contribute to testing, code reviews, and engineering best practices.
• Participation in clarification of requirements and coordination with stakeholders.
• Participation in production rollout.

Skills

C#

.NET 8/10

ASP.NET Core

Windows Services

Azure Blob Storage

Azure Key Vault

Application Insights

Azure DevOps

X.509 certificates

Certificate lifecycle

async programming

dependency injection

Git

PowerShell

Windows Server

Tools

Azure DevOps

Git

PowerShell

Job description

Gå til indholdet

We are looking for a Senior .NET Backend Developer for our Client in the manufacturing industry.

The consultant will be responsible for developing, maintaining and supporting a secure certificate provisioning solution, enabling secure device onboarding and certificate lifecycle management. The role involves hands-on backend development using .NET 8/10 and ASP.NET Core APIs, combined with Azure services, X.509/other certificates and Windows Services.

The ideal candidate is a Senior .NET Backend Developer who is comfortable working across application development and support, Azure cloud services, certificates, DevOps and production environments, with a strong focus on security, reliability and integration solutions. Following an initial on-site introduction, remote work is possible.

Key responsibilities

• Develop and maintain .NET 8/10 backend services, Windows Services, and ASP.NET Core APIs.
• Support X.509/other certificate generation, validation, storage, and lifecycle management.
• Maintain integrations with Azure Blob Storage, Key Vault, and Application Insights.
• Troubleshoot production issues across application, infrastructure, and certificate-related workflows.
• Maintain CI/CD pipelines, deployment automation, and release processes using Azure DevOps.
• Contribute to testing, code reviews, and engineering best practices.
• Participation in clarification of requirements and coordination with stakeholders.
• Participation in production rollout.

Qualification criteria (Must have)

• Strong experience with C#, .NET 8/10, ASP.NET Core, and Windows Services.
• Experience with Azure Blob Storage, Key Vault, Application Insights, and Azure DevOps.
• Knowledge of X.509/other certificates, and certificate lifecycle management.
• Strong understanding of async programming, dependency injection, file handling, and troubleshooting.
• Experience with Git, PowerShell, CI/CD pipelines, and Windows Server environments.

Preferred Qualifications (Nice to have)

• 5+ years of .NET backend development experience.
• Familiarity with OpenSSL, certificate automation, and secure credential management.
• Experience with production monitoring, observability, and enterprise integrations.

Påkrævede færdigheder: CI/CD, Azure DevOps, C#, .Net, Azure Application Insights, X.509, Blob Storage, Azure, Azure Key Vault

Foretrukne færdigheder: Code reviews, Backend engineering, OpenSSL, Powershell

Sprog: Engelsk (Øvet)

Start date: 01-10-2026

End date: 20-03-2027

Location: Bjerringbro, Denmark

Contact: Thomas Kragh, Jelber - [e-mail]