Senior C# / .NET Developer – API Specialist

Description

Job Summary: We are seeking a Senior Developer with experience in designing, developing, and maintaining C# and .NET backend applications, specializing in RESTful APIs, code quality, and clean architecture. Key Highlights: 1. Design, development, and maintenance of C# and .NET backend applications 2. Creation of robust, scalable, and secure RESTful APIs 3. Focused on code quality, best practices, and clean architecture We seek a Senior Developer with extensive experience in designing, developing, and maintaining C# and .NET-based backend applications, specializing in building robust, scalable, and secure RESTful APIs. A professional focused on code quality, best practices, and clean architecture, with a strong business results orientation. Experience and Specializations More than 3 years in enterprise software development. Design and implementation of REST APIs and Web Services using ASP.NET Core. Implementation of clean architectures, Domain-Driven Design (DDD), SOLID principles, and design patterns. Integration with external systems and microservices. Performance, scalability, and security optimization. Key Technologies Language: C# Frameworks: .NET, .NET Core, ASP.NET Core APIs: REST, OpenAPI/Swagger, JWT, OAuth2 Architecture: Microservices, Clean Architecture, Hexagonal ORM: Entity Framework / EF Core, Dapper Databases: SQL Server, PostgreSQL, MySQL, MongoDB Testing: NUnit, Moq DevOps: Azure DevOps / GitHub Actions, CI/CD Cloud: Azure (App Services, Functions, Storage, Service Bus) Typical Responsibilities Technical analysis and design of backend solutions. Development of secure, high-performance APIs. Code reviews and mentoring of junior and semi-senior developers. Collaboration with frontend, QA, and DevOps teams. Implementation of unit and integration tests. Technical documentation and production support. Working in agile teams (Scrum / Kanban). Monday to Friday, on-site, 8 AM to 6 PM Indefinite-term contract Workplace: KM2 Medellín Highway, 10 minutes from Guadua Bridge Employment Type: Full-time, Indefinite Workplace: On-site employment Salary Range: COP 4,500,000 to 5,000,000, depending on experience. -Requirements- Minimum Education: University Degree / Professional Program 3 years of experience Skills: .NET, API, Backend, Database, C#, Frontend Development, Programming Keywords: developer, programmer, senior, sr, dotnet, net, net, specialist, especialista