Senior Back-end Engineer (.NET)

Debug, maintain, and support existing C#/.NET services in production, prioritizing stability over rewrites. Translate business requirements (e.g., tax logic, compliance rules) into correct technical logicthis matters more than syntactic elegance. Work comfortably within legacy or imperfect codebases without the ability to refactor, maintaining consistency with existing patterns. Write custom C# code where needed, rather than relying solely on frameworks, the codebase is a mix of framework and custom logic. Read and work with legacy scripting (PHP-like syntax) found in some non-C# scripts within the system. Collaborate with frontend teams on API contracts and secure integrations with payment providers.

5+ years of professional experience in backend development with .NET and C# C1 English level or higher Proven production experience implementing Clean Architecture and CQRS patterns, such as MediatR Modern C#/.NET + custom code: Solid production experience with modern .NET, but also comfortable writing custom logic rather than depending entirely on frameworks (e.g., MediatR/CQRS as one part of a hybrid framework + custom-code system). Hands-on experience with AWS (ECS Fargate, RDS) Strong MySQL expertise (Dapper for performance-critical queries, EF Core for domain management) Solid unit/integration testing practices Legacy scripting exposure (plus): Familiarity with PHP or PHP-like scripting is a strong plus, given legacy scripts in the codebase outside of C# Skills .NET Clean Architecture CQRS MediatR MySQL Dapper Entity Framework Core AWS Fargate AWS RDS Unit Testing Integration Testing AWS testing

Braintree Paymentech Payment Gateways API Security