Senior .NET Backend Developer

• 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 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 xUnit, NSubstitute and Bogus
• Contribute to CI/CD pipelines, including Azure DevOps and YAML pipelines, and follow branching strategies such as GitFlow
• Instrument services for observability, including structured logging, metrics and tracing, and help diagnose production issues
• Review code, including AI-generated code, to uphold quality, security and performance standards
• Participate in code reviews, technical refinement and estimation, and mentor less experienced developers
• Work with technical and non-technical stakeholders to turn requirements into pragmatic, maintainable solutions
• Collaborate closely with Product, Architecture, QA and Frontend colleagues in a multicultural, fast-moving delivery environment

• 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)
• Nice to have: Experience with MongoDB, including document modelling and aggregation
• Nice to have: Knowledge of Infrastructure as Code, using technologies such as Terraform, Bicep or ARM
• Nice to have: Exposure to a frontend framework such as React, Angular or Vue, including API integration from the client side
• Nice to have: Experience working in polyglot environments, such as Node.js, Python or Java

• 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
• Health and Well-being team, inclusion specialists, and affinity groups
• Support and accommodations for people with disabilities during the selection process