[Job-32156] Senior .NET Backend Developer

Ciandt

Job details

  • REMOTE
  • UNKNOWN
  • Brazil
  • Brazil
  • Verified 2026-10-06
  • Source: Ciandt public LEVER source

Original job description

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.

You will design, build and evolve scalable, secure and maintainable backend services using a modern .NET stack, working closely with Product, Architecture, QA and Frontend colleagues in a collaborative, multicultural and fast-moving environment.

Your 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.

Requirements for this challenge

  • 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).

Nice to have

  • Knowledge of CQRS and Domain-Driven Design (DDD).

  • Experience with MongoDB, including document modelling and aggregation.

  • 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.

  • Experience working in polyglot environments, such as Node.js, Python or Java.

#midsenior #Li-MG04

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