Senior .NET Backend Developer 6 Months Contract

Belmont Lavan; Viborg; Hybrid; DKK 700,000 - 900,000; Full time

Job summary

Belmont Lavan is seeking a Senior .NET Backend Developer to build, maintain, and support a secure certificate provisioning solution for device onboarding and certificate lifecycle management. The role combines hands-on development with .NET 8/10, ASP.NET Core, Azure services, X.509 certificates, Windows Services, DevOps, and production support.

Following an initial on-site introduction, the position offers remote work flexibility and opportunities to improve security, reliability, and automation

Qualifications

• Design, develop, maintain .NET backend services and APIs.
• Implement certificate-related workflows and lifecycle management.
• Integrate with Azure services and cloud resources.
• Ensure production readiness, security, and reliability.

Responsibilities

• Develop and maintain .NET 8/10 backend services and APIs.
• Maintain Windows Services and ASP.NET Core applications.
• Support certificate management workflows and security measures.
• Improve CI/CD pipelines and deployment automation.
• Provide production support and issue resolution.

Skills

C#

.NET 8/10

ASP.NET Core

Windows Services

Azure

Azure DevOps

CI/CD

Git

PowerShell

Tools

Azure Blob Storage

Azure Key Vault

Application Insights

Job description

We are looking for a Senior .NET Backend Developer to develop, maintain, and support a secure certificate provisioning solution that enables secure device onboarding and end-to-end certificate lifecycle management.

The role combines hands-on backend development with .NET 8/10, ASP.NET Core, Azure services, X.509 certificates, Windows Services, DevOps, and production support. You will work across application development, cloud services, security, integrations, deployment, and operational support.

The ideal candidate will have strong backend development experience and be comfortable working in production environments where security, reliability, troubleshooting, and automation are critical.

Following an initial on-site introduction, the role can be performed remotely.

Working Environment

This is a hands-on engineering role covering both development and production support. The successful candidate should be comfortable taking ownership of technical issues from investigation through to implementation, deployment, and production rollout.

Requirements

• Design, develop, maintain, and support .NET 8/10 backend services, Windows Services, and ASP.NET Core APIs
• Implement and support X.509 and other certificate-related workflows, including certificate generation, validation, storage, renewal, and lifecycle management
• Develop and maintain integrations with Azure Blob Storage, Azure Key Vault, and Application Insights
• Troubleshoot and resolve production issues across application, infrastructure, integration, and certificate-related workflows
• Maintain and improve CI/CD pipelines, deployment automation, and release processes using Azure DevOps
• Support production deployments and participate in production rollouts
• Contribute to automated and manual testing, code reviews, and software engineering best practices
• Participate in requirements clarification, technical discussions, and coordination with relevant stakeholders
• Contribute to the continuous improvement of system security, reliability, performance, and maintainability
• Provide technical support and investigation for issues across development, test, and production environments

Essential Skills & Experience

• Strong professional experience with C# and .NET 8/10
• Solid experience developing ASP.NET Core APIs and backend services
• Experience developing and maintaining Windows Services
• Hands-on experience with Microsoft Azure, particularly:
  • Azure Blob Storage
  • Azure Key Vault
  • Azure Application Insights
• Practical knowledge of X.509 certificates and certificate lifecycle management
• Strong understanding of asynchronous programming, dependency injection, file handling, and backend troubleshooting
• Experience with Git, PowerShell, CI/CD pipelines, and Azure DevOps
• Experience working with Windows Server environments
• Strong troubleshooting and problem-solving skills, with the ability to investigate issues across application and infrastructure layers
• Comfortable working with production systems and supporting releases and deployments

Desirable Skills & Experience

• 5+ years of professional .NET backend development experience
• Familiarity with OpenSSL and certificate automation
• Experience with secure credential and secret management
• Experience with production monitoring, observability, and application diagnostics
• Experience developing or maintaining enterprise integrations
• Experience working in security-focused or device onboarding environments
• Understanding of secure software development practices and enterprise deployment processes

Location: Initial on-site introduction, followed by remote working.

Role focus: .NET Backend Development | Azure | Certificate Management | DevOps | Production Support | Security