Senior Back-end Developer (.NET)

Migrate complex legacy business logic to modern .NET 8+ Web APIs following Clean Architecture principles (Domain, Application, Infrastructure)
Design and implement secure, robust APIs with strict authentication flows and compliance-mandated session timeouts
Optimize MySQL data access: Dapper for performance-critical paths, EF Core for standard domain operations
Define clear API contracts for frontend integration and payment provider connectivity (Braintree/Paymentech)

5+ years of professional experience in backend development with .NET / C#
C1 English level or higher
Proven production experience with Clean Architecture and CQRS patterns (MediatR or similar)
Strong MySQL expertise with Dapper for high-performance queries and EF Core for domain management
Hands-on AWS experience: Fargate, RDS
Demonstrated focus on unit and integration testing