Senior .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 looking for a Senior .Net Developer to be part of our team!

Responsibilities:

Develop and maintain high-quality C# code across our microservices ecosystem

Implement complex business logic for a large company in the food market

Manage own priorities and performance to deliver high quality, highly performant solutions

Documenting your work and contribute to continuous integration/continuous delivery (CI/CD) processes

Develop APIs that facilitate communication between our microservices

Implement messaging patterns for asynchronous communication between services

Integrate with external systems and databases while maintaining system integrity

Ensure proper error handling and resilience in service communications

Write comprehensive unit and integration tests for C# components

Conduct code reviews to maintain code quality and architectural integrity

Troubleshoot and resolve complex technical issues across the service ecosystem

Mentor junior developers in C# best practices and design patterns

Contribute to technical decision-making and architectural discussions

Requirements:

Professional experience with C# and .NET development

Strong knowledge of .NET Core/5+ and ASP.NET Core Web API

Experience with microservices architecture and distributed systems

Proficiency in asynchronous programming patterns in C# (Task, async/await)

Advanced C# programming skills including LINQ, generics, and reflection

Experience with dependency injection and inversion of control patterns

Familiarity with ORM frameworks (Entity Framework Core)

Knowledge of RESTful API design and implementation

Experience with SQL Server and writing efficient queries

Understanding of data access patterns and transaction management

Knowledge of database performance optimization techniques

Experience with data serialization formats (JSON, XML)

Proficiency in unit testing frameworks (xUnit, NUnit, or MSTest)

Experience with mocking frameworks (Moq, NSubstitute)

Familiarity with containerization using Docker

Advanced/fluent English

Nice to Have:

Understanding of CI/CD pipelines for .NET applications

Knowledge of logging, monitoring, and observability in distributed systems

Experience with GraphQL in .NET applications

Knowledge of authentication/authorization frameworks (Identity Server, JWT)

Familiarity with CQRS and Mediator patterns

Experience with internationalization and localization in .NET

Understanding of domain-driven design principles

Understanding of test-driven development principles

Knowledge of continuous integration practices

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.