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At First Line Software, we design and deliver custom software solutions that help integral businesses grow, innovate, and stay ahead. Our clients span industries and continents, and our mission is simple: transform complex challenges into powerful, scalable applications.
We are a team of experts who value collaboration, curiosity, and excellence, and we are looking for professionals who share our passion for building impactful software.
About the Role
We are seeking a Senior .NET Developer to join our team and contribute to the design and development of scalable, cloud-based backend systems.
In this role, you'll:
- Build and maintain APIs and backend services that power modern web applications
- Work with a modern Microsoft stack and Azure cloud services
- Collaborate closely with other developers, architects, and product teams to ensure our solutions are high-quality, performant, and maintainable

This role is perfect for someone who thrives in fast-moving,



collaborative environments and enjoys working across different projects and industries.
Requirements
Must-Have Skills:
- Strong experience with C#, .NET Core / Framework, Entity Framework, and LINQ
- Proficiency in Web API development and RESTful services
- Solid knowledge of T-SQL and relational database design
- Hands-on experience with Azure services
- Familiarity with Swagger / OpenAPI for API documentation
- Skilled in Git version control and CI/CD using Azure DevOps or GitHub Actions
- Practical experience with Docker for containerization

Nice-to-Have Skills:
- Knowledge of Microsoft Fabric and Dapr
- Understanding of database administration and migrations (Code-first & DB-first)

What Youll Do
- Design, develop, and maintain scalable backend solutions
- Build and integrate APIs to support web and mobile applications
- Optimize SQL queries and database performance
- Implement CI/CD pipelin

📌 Senior Dotnet Developer (Colombia)
🏢 First Line Software
📍 Colombia