[Job - 32535] Mid-Level .NET Developer, Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.

With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.

We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.

We are hiring a Mid-Level .NET Developer to maintain and improve our web applications built with . NET and React . A key focus of this role is modernizing how the applications handle user login and security (authentication and authorization), and updating our code to use newer .NET Core versions.

You will work with a team that values clear communication and collaboration. You will talk directly with stakeholders to understand what needs to be done and help prioritize tasks.

What You Will Do

• Maintain and improve existing ASP.NET and .NET Core web applications
• Design and build modern login and security systems (OAuth2, OIDC, JWT, and identity providers)
• Plan and execute upgrades to newer .NET Core versions
• Work with AWS, MySQL, PostgreSQL, and external services
• Use Bitbucket and automated testing tools (Playwright) to deliver quality code
• Work with CI/CD pipelines to automate testing and deployment
• Communicate in English with stakeholders to discuss priorities and understand requirements

What You Need to Know

• 5+ years of professional experience with .NET (C#) and web development
• Proven experience with authentication and authorization systems
• Proven experience with upgrading .NET versions
• Experience with React in production applications
• Experience with AWS and relational databases (MySQL, PostgreSQL)
• Experience with third-party API integrations
• Comfortable with Bitbucket/Git and version control
• Experience with automated testing (Playwright is a plus)
• Advanced English proficiency and strong communication skills

#LI-THAI23

Our benefits:

-Health and dental insurance

-Meal and food allowance

-Childcare assistance

-Extended paternity leave

-Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass;

• Profit Sharing and Results Participation (PLR);

-Life insurance

• Continuous learning platform (CI&T University);

-Discount club

-Free online platform dedicated to physical, mental, and overall well-being

-Pregnancy and responsible parenting course

-Partnerships with online learning platforms

-Language learning platform

And many more!

More details about our benefits here: https://ciandt.com/br/pt-br/carreiras

At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here .

This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it.

We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.