.Net Developer

Engineering & Development
|
Senior
Senior
Brazil
Colombia
|
Brazil
Colombia
open
August 14, 2025

About the company

At First Line Software, we design and deliver custom software solutions that help global 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.

The project and your 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.

What You'll 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 pipelines and maintain deployment workflows
  • Write clean, testable, and maintainable code following SOLID principles
  • Participate in code reviews and agile ceremonies
  • Stay updated with the latest trends in .NET and Azure technologies

Responsibilities

  • Design, develop, and maintain robust Web APIs using .NET technologies
  • Build scalable backend services within a cloud-native architecture
  • Collaborate with frontend developers and DevOps engineers to deliver end-to-end solutions
  • Optimize application performance and database queries
  • Ensure code quality through testing, code reviews, and clean architecture principles
  • Contribute to CI/CD workflows and participate in deployment processes
  • Document APIs using OpenAPI/Swagger standards
  • Monitor, debug, and improve system performance and reliability

Your skills

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:

  • .NET Aspire experience
  • Knowledge of Microsoft Fabric and Dapr
  • Understanding of database administration and migrations (Code-first & DB-first)

What we can offer

  • Our modern stack projects are the right mix of exciting and challenging
  • Gain access to our diverse range of training programs, courses, and certifications
  • Choose your work style - remote, on-site or hybrid in one of our stunning offices. We offer the freedom of flexible working hours
  • Enhance your language skills with our corporate English classes
  • Work from anywhere and explore the world with our Workation program
Start Application

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Our Hiring Process

Getting started with us

Here's what you can expect when you send us your application

Step 0

Tech Talent Hunt

Be scouted or apply for your role

Step 1

Meeting & Connecting

Our first step to building lasting relationships

Step 2

Uncovering Potential

Your HR interview

Step 3

The Code Challenge or Technical Interview

It's time to show what you can do best!

Step 4

Client’s Interview

Demonstrating expertise to our future partners

Final

The Last Piece of the Puzzle

Job offer to finalize our tech team

Join our team of innovative thinkers

Let’s talk!

Have any questions? Fill out the form and our team will be in touch!

Let’s talk!

Have any questions? Fill out the form and our team will be in touch!