Senior .NET Core Developer Needed for Mission-Critical Microservices Refactor

CoreData Systems

Freelance · Remote · Flexible hours

About the role

CoreData Systems is modernizing a legacy production platform that must stay online 24/7. We need a .NET Core Developer to redesign core services, introduce containerization, and implement zero‑downtime deployment strategies. The project focuses on performance, scalability, and cloud‑native architecture.

Key responsibilities

• Refactor legacy .NET code to .NET 6/7 using clean architecture principles
• Design and implement Azure‑based microservices with CI/CD pipelines
• Ensure zero‑downtime releases using blue‑green or canary deployments
• Write automated tests and improve code coverage
• Collaborate with QA and Ops to monitor performance in production

Must-have skills

• 5+ years of .NET Core development
• Strong C# expertise and async programming
• Hands‑on experience with Azure services (App Service, Functions, AKS)
• Proficiency in Docker and Kubernetes for container orchestration
• Understanding of zero‑downtime deployment patterns

Nice to have

• Experience with Terraform or ARM templates
• Familiarity with RabbitMQ or Azure Service Bus
• Background in performance tuning legacy monoliths