We're looking for a Full Stack Developer to join our team, with a strong emphasis on frontend development using React and TypeScript. In this role, you'll primarily focus on building high-quality user interfaces while also contributing to backend services built with .NET/C# when needed. We value engineers who enjoy solving complex problems, take ownership of their work, and dive deep into understanding the business domain. You should be comfortable designing scalable service contracts, working with clean and maintainable data structures, and collaborating across teams.Responsibilities: Develop and maintain modern, scalable frontend applications using React + TypeScript Collaborate on backend services and APIs using .NET / C# Design and consume RESTful APIs Ensure code quality through testing, code reviews, and best practices Contribute to architectural decisions and technical improvements Work closely with cross-functional teams in an Agile environmentRequirements:English: Avanced or Fluent English comunication skillsLanguages Strong proficiency in JavaScript / TypeScript (ES6+) Working knowledge of C# Solid experience with HTML, CSS, and SCSSFrontend React (v18+), including functional components and hooks State management with Redux / Redux Toolkit UI frameworks such as Bootstrap / React-Bootstrap Experience with AG Grid or similar enterprise-grade data grids Testing with Jest and React Testing Library Familiarity with Webpack or similar build toolsBackend Experience with .NET 8 / ASP.NET Core Web API Strong understanding of RESTful API design Experience with MongoDB or other NoSQL databasesTools & Practices Proficiency with Git (branching, merging, code reviews) Experience with CI/CD pipelines (e.g., GitLab CI/CD) Familiarity with Agile/Scrum methodologiesNice to have: Experience with Redux Saga or similar middleware End-to-end testing using Playwright Knowledge of MediatR / CQRS patterns Validation frameworks like FluentValidation Authentication/authorization with Auth0, OAuth 2.0, or JWT Experience with Redis or distributed caching Exposure to Kubernetes / Helm Infrastructure as Code (e.g., Terraform) Cloud experience with AWS (e.g., Lambdas, Secrets Manager) Observability tools like Datadog Real-time communication using SignalR Object mapping tools like Mapster or AutoMapperAvenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a Consultancy company, Avenue Code may share your information with its clients and other Companies from the CompassUol Group to which Avenue Code's consultants are allocated to perform its services.