This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

In Argentina within the fintech industry, we are searching for a Senior .NET Developer to provide technical support and contribute to the development and evolution of backend services and distributed systems. This role involves working with modern .NET 8, applying advanced architectural patterns, and ensuring scalable, maintainable, and reliable digital solutions.

This is you

You have strong experience developing backend solutions and are comfortable working with modern .NET tools, frameworks, and architectural patterns. You enjoy solving complex problems and building scalable, maintainable systems.

You have experience with:

• .NET 8 (C# 12) for building services and applications.
• Worker Services for background or scheduled processing.
• SQL Server as a core relational database.
• Docker for containerizing and running services.
• Refit for integrating external APIs through typed HTTP clients.
• MediatR to implement clean, decoupled request/handler flows.
• FluentValidation to validate inputs cleanly and consistently.
• xUnit + Moq for unit and integration testing using builders and mocks.
• Swagger / OpenAPI to document endpoints.
• SonarQube for code quality and maintainability checks.

And solid knowledge of:

• SOLID design principles.
• Repository Pattern to abstract and organize data access.
• Specification Pattern for reusable, optimized queries.
• ErrorOr Pattern to manage results and errors consistently.
• Builder Pattern to simplify creating complex test objects.
• CQRS (Command/Query separation) for scalable architectures.
• Event-driven integration using asynchronous events and handlers.
• Dependency Injection following .NET’s conventions.
• AutoModelBinder for clean parameter binding

Nice-to-have skills:

• Experience with cloud environments (AWS / Azure / GCP).
• Knowledge of CI/CD tools and DevOps practices.
  
• Familiarity with monitoring and observability (OpenTelemetry, etc.).
  
• Experience with high-load or high-availability systems.

This is your role

• Provide support in developing and maintaining backend services using .NET 8 and associated frameworks.
• Design and implement clean, scalable, and testable architectures.
• Develop and enhance background processes using Worker Service.
• Create integrations using Refit, ensuring robust and secure API communication.
• Apply design patterns such as CQRS, Repository, Specification, and Event-Driven principles.
• Write automated tests using xUnit and Moq, ensuring high code quality and coverage.
• Participate in code reviews, promoting best practices and clean code standards.
• Document APIs with Swagger/OpenAPI and ensure alignment with project guidelines.
• Collaborate with cross-functional teams to resolve technical challenges and deliver high-quality features.
• Contribute to continuous improvement initiatives and architectural decisions.

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.