Contract Cloud Migration Specialist (Backend .NET)

Freelance Senior Backend Engineer – .NET Core & Cloud Migrations** **To apply for this job you must send your hourly rate and resume to only. About the Role We are seeking an experienced Senior Backend Engineer to support a critical application modernization initiative. This role will focus on migrating an existing .NET application to .NET Core, refactoring backend-to-data-layer logic, and transitioning infrastructure from AWS EC2 to containerized environments. This is a hands-on engineering role suited for someone who has led or executed similar migrations and is comfortable working independently while collaborating closely with QA, DevOps, and product stakeholders. Key Responsibilities Lead and execute the migration from .NET Framework to .NET Core Refactor and modernize backend logic and data access layers Refactor and update business logic across the backend layer (API services, controllers, etc.) and data layer (Entity Framework, database interactions, ORM optimizations). Proven track record in containerization and DevOps: Docker, Kubernetes, AWS ECS/EKS, or similar. Improve application performance, scalability, and maintainability Support migration from AWS EC2 to containerized infrastructure (Docker, ECS, Kubernetes, or similar) Solid understanding of RESTful APIs, microservices, and cloud-native principles. Collaborate with QA to ensure test coverage, regression stability, and data integrity Assist with CI/CD pipeline integration and deployment best practices Document architectural decisions, migration steps, and technical changes Identify risks and propose mitigation strategies during the migration process Required Qualifications 7+ years of professional backend software development experience Strong expertise in C#, .NET Framework, and .NET Core Proven experience migrating legacy applications to modern frameworks Solid understanding of backend architecture and data-layer design Experience with AWS, particularly EC2 and container services Hands-on experience with Docker and containerized deployments Strong SQL and database experience (e.G., SQL Server, PostgreSQL, or similar) Comfortable working in a freelance/contract capacity with minimal oversight Strong communication and documentation skills Nice to Have Experience with microservices architecture Familiarity with Kubernetes or AWS ECS Knowledge of front-end integration (if needed, e.G., with Angular) or full-stack capabilities. Experience with performance tuning, security best practices (e.G., OAuth, JWT), and handling large-scale data migrations. Experience supporting QA during large-scale migrations Knowledge of CI/CD tools (GitHub Actions, Azure DevOps, Jenkins, etc.) Previous work on application modernization or platform re-architecture projects Engagement Details Freelance / independent contractor role Flexible hours with some overlap with U.S. business hours How to Apply Please submit: Resume sent to Contract hourly rate • *To apply for this job you must send your hourly rate and resume to only.