Senior .NET Backend Developer (C#)

? Remote ? Colombia

About the Role

We’re looking for a Senior .NET Backend Developer to join a team in the financial services industry. You’ll work hands-on in the middle layer and backend, building Web APIs with C# and .NET, working with SQL Server, and integrating messaging and Azure PaaS services. We’re looking for a strong backend developer who is comfortable with database queries and optimization, and who is proactive, learns on their own and works with AI.

What You’ll Do

- Develop middle-layer and backend services with C#, .NET / .NET Core and Web API.
- Write, troubleshoot and optimize SQL Server queries, stored procedures and indexes.
- Work with Entity Framework and LINQ for data access.
- Implement messaging and queue mechanisms with RabbitMQ and Azure Service Bus.
- Build and deploy on Azure PaaS services such as Azure Web Apps and Azure Functions.
- Write unit tests, including mocks, to keep the code reliable.
- Implement logging and monitoring to keep services observable.
- Apply design patterns to build maintainable solutions.

Required Qualifications

- 3–5 years of experience with .NET or .NET Core.
- 3+ years of experience with C#.
- 1+ year of Web API experience.
- 2+ years of SQL Server experience,



including queries and optimization (backend focus, not a DBA role).
- Hands-on experience troubleshooting and debugging existing stored procedures and indexes.
- Hands-on middle-layer and backend development experience.
- Entity Framework and LINQ.
- RabbitMQ or other queue mechanisms.
- Azure PaaS services (Azure Web Apps, Azure Functions) and Azure Service Bus.
- Unit testing, including writing mocks.
- Logging and monitoring.
- A basic understanding of design patterns.

Preferred Qualifications

- Hands-on work with AI (strongly preferred).
- An understanding of Docker and Kubernetes.

Technical Environment C# · .NET / .NET Core · ASP.NET Web API · SQL Server · Entity Framework · LINQ · RabbitMQ · Azure Service Bus · Azure Web Apps · Azure Functions · Unit testing & mocking · Docker · Kubernetes

Core Competencies

Self-learner · Self-starter · Proactive · Strong backend problem solving · Performance-minded with data · Ownership of code quality

Why Join Us

At Unosquare you’ll build backend services for a financial services platform with a modern .NET and Azure stack, working with a team that values proactive engineers who keep learning, including in AI.

📌 Sr C# Developer (Colombia)
🏢 .Net Unicorns
📍 Colombia