Lead/Senior .Net Engineer

We are looking for an experienced Lead/Senior .NET Engineer to join a long-term modernization initiative focused on transforming a large-scale enterprise platform from .NET Framework 4.8 to .NET 10. This is a hands-on engineering role where you'll work on modernizing backend architecture, migrating legacy components, improving code quality, and preparing the platform for cloud-native deployment on AWS. You'll collaborate with experienced engineers in an Agile environment while helping shape the future architecture of a mission-critical system.

Responsibilities:

• Drive the migration of a large enterprise application from .NET Framework 4.8 to .NET 10.
• Modernize backend services and replace legacy Windows-specific dependencies with cross-platform solutions.
• Migrate a large Entity Framework 6 data model to EF Core 8, one bounded context at a time.
• Refactor legacy code following modern architecture principles and best engineering practices.
• Improve automated testing by introducing unit test coverage and quality gates.
• Collaborate with DevOps engineers on containerization, Docker configuration, and AWS deployment.
• Participate in architecture discussions, code reviews, technical planning, and Agile ceremonies.

Requirements:

• 5+ years of commercial experience with C#/.NET backend development.
• Strong expertise with ASP.NET, ASP.NET Core, and modern .NET.
• Proven commercial experience migrating applications from .NET Framework to .NET Core / .NET 8+.
• Strong experience with Entity Framework Core.
• Good understanding of DDD, CQRS, and layered architecture.
• Experience building containerized applications using Docker.
• Solid knowledge of xUnit, Moq, and automated testing practices.
• Experience deploying .NET applications to AWS ECS/Fargate and working with ECR.
• Experience with RabbitMQ, MassTransit, or similar messaging technologies.
• Experience with Hangfire or other background job processing frameworks.
• Strong Git workflow and experience working in Agile teams.

Nice to have:

• Experience designing and maintaining CI/CD pipelines.
• Familiarity with Angular applications or micro-frontend architecture.
• Experience implementing automated code coverage in CI.
• Knowledge of performance optimization and scalable distributed systems.