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[Job-32156] Senior .NET Backend Developer

CI&T· R&D / Engineering
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Hybrid (Remote)$0HomeofficePosted 2w ago

About the role

Senior .NET Backend Developer to design, build and evolve scalable, secure backend services using a modern .NET stack, collaborating with Product, Architecture, QA and Frontend teams in a fast-moving, multicultural environment.

Responsibilities

  • 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.

Qualifications

  • 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.
  • Experience with relational databases such as PostgreSQL or SQL Server, including data modelling and query optimization.
  • Experience with distributed systems and messaging, using technologies such as Azure Service Bus, Rebus, RabbitMQ, Kafka or equivalent.
  • 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.
  • Experience building autonomous or semi-autonomous agents for software development, or knowledge of prompt engineering and evaluating AI output quality.
  • Experience with automated testing, including unit and integration testing and the use of test doubles.
  • Working knowledge of Docker and Docker Compose.
  • Familiarity with observability tools such as Datadog, Grafana, Application Insights or the ELK Stack.
  • Experience with Git, CI/CD pipelines and Azure DevOps, or similar tools.
  • Good communication skills and a collaborative, ownership-driven mindset.
  • Good spoken and written English (upper-intermediate or above).

Skills

Required:C#.NET 8+RESTful APIsSOLID, Clean ArchitectureEntity Framework CoreDatabasesAzure Service Bus / RabbitMQ / KafkaDocker / Docker ComposeCI/CD (Azure DevOps)
Nice to have:MediatRAutoMapperObservability tools

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!
Last updated Oct 21, 2026. Interested? Apply on the company site.

About CI&T

Technology Transformation Specialists

A global technology consulting and digital transformation firm that combines human expertise with AI to develop innovative solutions.

Technology transformationAISoftware developmentCloud servicesDigital experienceData analyticsApplication modernizationConsulting
Company profileWebsite

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