search Browse Jobs
[Job-32156] Senior .NET Backend DeveloperCI&T · Brazil
CI&T logo

CI&T

company page ↗

[Job-32156] Senior .NET Backend Developer

🗓️ Posted 2026-10-06 Brazil Homeoffice Hybrid ICT
💰 Salary Not shared 📊 Market US$10,000–US$20,000/mo

About the Company

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. At CI&T, we are looking for a skilled and motivated Senior .NET Backend Developer to join one of our delivery teams.

Responsibilities

  • ● ices using a modern .NET stack, working closely with Product, Architecture, QA and Frontend colleagues in a collaborative, multicultural and fast-moving environment.
  • ● Design, develop and maintain RESTful APIs and backend services using C and .NET 8+.
  • ● Apply Clean Architecture, SOLID and KISS principles to keep code modular, reusable and simple.
  • ● Build event-driven and asynchronous integrations using messaging platforms such as Azure Service Bus, RabbitMQ or Kafka.
  • ● Model, query and optimize relational databases such as PostgreSQL and SQL Server, using Entity Framework Core.
  • ● Work with document databases such as MongoDB, when needed.
  • ● Implement secure authentication and authorization using OAuth2/OIDC and JWT.
  • ● Write and maintain automated unit and integration tests using tools such as xUnit, NSubstitute and Bogus.
  • ● Contribute to CI/CD pipelines, including Azure DevOps and YAML pipelines, and follow agreed branching strategies such as GitFlow.
  • ● Instrument services for observability, including structured logging, metrics and tracing, and help diagnose production issues.
  • ● Critically read, validate and review code, including code generated by AI tools, to uphold quality, security and performance standards.
  • ● Take part in code reviews, technical refinement and estimation, and help mentor less experienced developers.
  • ● Work with technical and non-technical stakeholders to turn requirements into pragmatic, maintainable solutions.

Requirements

  • ● Solid experience as a backend developer working with C and .NET, ideally .NET 8+, including production-grade RESTful APIs.
  • ● Strong knowledge of object-oriented design, SOLID principles, design patterns and Clean Architecture.
  • ● Hands-on experience with MediatR, AutoMapper and Entity Framework Core.
  • ● Practical use of AI tools in software development, such as GitHub Copilot, Claude, OpenAI APIs or similar, including AI-assisted code generation, testing and refactoring.
  • ● Working knowledge of Docker and Docker Compose.
  • ● Familiarity with observability tools such as Datadog, Grafana, Application Insights or the ELK Stack.
  • ● Good communication skills and a collaborative, ownership-driven mindset.
  • ● Good spoken and written English (upper-intermediate or above).
  • ● Nice to have
  • ● Knowledge of CQRS and Domain-Driven Design (DDD).
  • ● Knowledge of Infrastructure as Code, using technologies such as Terraform, Bicep or ARM.
  • ● Exposure to a frontend framework such as React, Angular or Vue, including API integration from the client side.