Evolve and maintain APIs in ASP.NET Core (controllers, middleware, dependency injection, configuration, request pipeline).
Develop HTTP integrations with partners/external services (JSON contracts, error handling, resilience).
Maintain and enhance WinForms modules (UI/screens, event handling, performance, and stability).
Implement data access using Dapper / Dapper.Contrib with SQL Server and PostgreSQL.
Ensure observability and diagnostics (logging with Serilog, NLog; troubleshooting and fixes).
Write and maintain automated tests and support test quality/coverage.
Participate in code reviews, refactorings, and technical decisions (continuous improvement).

Strong knowledge and practical application of design patterns and coding best practices: DRY, SOLID, GRASP.
Experience with agile frameworks (Scrum: story points, planning, retrospectives).
Solid experience with modern C# and .NET.
Experience with ASP.NET Core Web API (Swagger/OpenAPI, health checks, authentication/authorization).
Experience with Dapper and SQL databases (SQL Server and/or PostgreSQL).
Experience with HTTP integrations and JSON serialization (Newtonsoft.Json).
Experience with logging and troubleshooting (Serilog, NLog).
Experience with automated testing: xUnit and mocks using NSubstitute.
Strong knowledge of Git and branching strategies.
Broad experience with collaborative development best practices (pull requests, code review, merging).
Experience with CI/CD pipelines using GitHub Actions.

C# Developer – .NET

Key skills