Senior .NET developer

Engineering & Development
|
Senior
Senior
Brazil
Colombia
Montenegro
Serbia
|
Brazil
Colombia
Montenegro
Serbia
open
March 25, 2026

About the company

First Line Software works with some of the worlds top businesses and organisations in industries like healthcare, real estate, data engineering, warehouse automation, retail digitalisation, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come.

We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.

Lets see what we can create together!

‍

The project and your role

We are looking for a Senior .NET Developer to join our team in the real estate industry. You will help build the next generation of our client’s website, making it faster and more powerful for users.

In this role, you will focus on building modern web services and cloud-based features. You will work on a "greenfield" style project, meaning you get to create new systems from the ground up using the latest technology to ensure the website can handle many users and provide a great experience.

Key Responsibilities

  • Design, develop, and maintain high-quality Web APIs using modern .NET technologies.
  • Build backend services that are designed to grow and scale within a cloud-native environment.
  • Work closely with frontend developers and DevOps engineers to provide complete, end-to-end software solutions.
  • Improve how the application runs by optimizing database queries and overall system performance.
  • Keep code quality high by using clean architecture principles, writing tests, and participating in code reviews.
  • Support automated build and deployment processes by contributing to CI/CD workflows.
  • Create clear and useful documentation for APIs using OpenAPI and Swagger standards.
  • Monitor the system to find and fix bugs, ensuring the platform remains reliable for all users.

‍

Your skills

Essential Qualifications (Must Haves):

  • Strong professional experience working with C#, .NET Core, .NET Framework, Entity Framework, and LINQ.
  • High level of skill in developing robust Web APIs and working with RESTful services.
  • Solid knowledge of T-SQL and the ability to design relational databases effectively.
  • Hands-on experience using Microsoft Azure cloud services to support web applications.
  • Proficiency in using Swagger or OpenAPI to document and share API details with the team.
  • Practical skills with Git for version control and CI/CD tools like Azure DevOps or GitHub Actions.
  • Direct experience using Docker to package and run applications in containers.

Desired Skills & Knowledge (Nice to Haves):

  • Familiarity with .NET Aspire or Dapr for building and managing distributed applications.
  • Experience managing database migrations using both Code-first and Database-first approaches.

‍

What we can offer

The FLS difference

  • 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
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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

Apply now!

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First Line Software, 2025

Let’s talk!

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