CI&T

Senior C# / .NET Developer

CI&T

full-time

Posted on:

Location Type: Hybrid

Location: Brazil

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Job Level

Senior

Tech Stack

MongoDB.NETPostgres

About the role

  • Develop and evolve backend services and APIs with a focus on quality, security, and scalability.
  • Design and maintain RESTful APIs consistently and in accordance with best practices.
  • Work on system integrations, messaging, and asynchronous processing.
  • Work with relational and non-relational databases, ensuring performance and data integrity.
  • Apply clean code principles, design patterns, and architectural best practices in backend solutions.
  • Implement and maintain authentication and authorization mechanisms, including OAuth 2.0, JWT, and related standards.
  • Use productivity tools and development acceleration resources such as Copilot and AI agent frameworks.

Requirements

  • Strong experience in C# and backend development with .NET 9/10.
  • Experience building and maintaining RESTful APIs.
  • Knowledge of messaging systems and asynchronous processing.
  • Experience with databases such as PostgreSQL and MongoDB.
  • Knowledge of design patterns and clean code best practices.
  • Experience with Copilot and AI agent frameworks.
  • Experience with authentication systems such as OAuth 2.0, JWT, and similar technologies.
  • Ability to operate in distributed environments with an architectural perspective and a focus on software quality.
Benefits
  • Health and dental insurance
  • Meal and food allowance
  • Childcare assistance
  • Extended parental leave
  • Partnerships with gyms and health & wellness professionals via Wellhub (Gympass) TotalPass
  • Profit Sharing (PLR)
  • Life insurance
  • Continuous learning platform (CI&T University)
  • Employee discount club
  • Free online platform dedicated to physical and mental health and well-being
  • Pregnancy and responsible parenthood course
  • Partnerships with online course platforms
  • Language learning platform
  • And many more
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
C#.NET 9.NET 10RESTful APIsPostgreSQLMongoDBOAuth 2.0JWTclean code principlesdesign patterns
Soft Skills
quality focussecurity focusscalability focusarchitectural perspectiveinterpersonal skills