[Job-27788] Senior Fullstack Developer (.NET & React)

Description

Job Summary: At CI&T, we're seeking a skilled Full-stack Developer to join our team, specializing in creating scalable tech solutions by blending human expertise with AI for technological transformation. Key Highlights: 1. Human expertise combined with AI to build scalable tech solutions 2. Develop and maintain a receipt management platform 3. Collaborate with over 1,000 clients We are specialists in **technological transformation**, combining human expertise with AI to create scalable tech solutions. With over 8,000 CI\&Ters worldwide, we have formed partnerships with more than 1,000 clients throughout our 30-year history. Artificial Intelligence is our reality. **Important**: If you reside in the Metropolitan Region of Campinas, your physical presence at our city offices is mandatory, per our current attendance policy. **Project:** Develop and maintain the receipts management platform, automating renewable energy certificate processing across 40\+ international registries for ION Carbon Zero platform integration. **Required Technical Skills:*** 5\+ years of full\-stack development experience with .NET and React * **Backend Development:** * C\#, .NET Core/.NET 6\+, ASP.NET Core * RESTful API design and development * Microservices architecture patterns * Entity Framework Core or Dapper * LINQ and async/await patterns * Dependency injection and IoC containers * **Front\-end Development:** * React 18\+, React Hooks, Context API * TypeScript, JavaScript (ES6\+) * Modern CSS, CSS\-in\-JS, or CSS modules * State management (Redux, Zustand, or similar) * Responsive web design principles * Database: * Azure SQL Server, T\-SQL * Cosmos DB (NoSQL) * Database design, optimization, and indexing * Complex queries and stored procedures * Cloud \& DevOps: * Microsoft Azure (App Services, Function Apps, Azure Storage, Key Vault) * CI/CD pipelines (Azure Pipelines, GitHub Actions) * Git/GitHub for source control * Docker containerization (preferred) * Testing: * Unit testing (xUnit, NUnit, MSTest) * Integration testing * Front\-end testing (Jest, React Testing Library) **Preferred Qualifications:*** Experience in financial services, commodity trading, or energy/climate tech sectors* Knowledge of Azure Logic Apps and Function Apps for middleware integration * Familiarity with API integration patterns and third\-party system connectivity * Experience with RPA concepts or handling non\-API data sources * Understanding of data governance and security compliance (SOC2, GDPR) * Experience with AI\-assisted development tools (Cursor, GitHub Copilot, Claude) * Knowledge of trading platforms or registry systems * Exposure to ION platforms or similar enterprise trading systems Responsibilities:* Develop and maintain Callisto platform UI components using React/TypeScript * Build and refactor C\#/.NET Core backend APIs and microservices * Implement receipt processing workflows for API\-based and non\-API registries * Design and optimize database schemas in Azure SQL and Cosmos DB * Integrate with ION Carbon Zero platform APIs for receipt/parcel management * Connect to operational database and data warehouse for trade data synchronization* Build middleware integrations using Azure Logic Apps and Function Apps * Implement secure API authentication and authorization patterns * Participate in knowledge transfer sessions with transitioning development team * Write comprehensive unit and integration tests with high code coverage * Optimize application performance and scalability for high\-volume processing * Follow SDLC best practices, code review standards, and documentation requirements* Collaborate with trade operations stakeholders to understand business requirements* Support production deployments and troubleshoot issues as needed **Our Benefits:*** Health and dental insurance; * Meal and food allowance; * Childcare assistance; * Extended parental leave; * Partnerships with gyms and health/wellness professionals via Wellhub (Gympass) TotalPass; * Profit Sharing and Results Program (PLR); * Life insurance; * Continuous learning platform (CI\&T University); * Discount club; * Free online platform dedicated to promoting physical health, mental well-being, and overall wellness; * Pregnancy and responsible parenting course; * Partnerships with online course platforms; * Language learning platform; * And many more More details about our benefits here: https://ciandt.com/br/pt\-br/carreiras At CI\&T, inclusion begins at first contact. If you are a person with disability, it is important to **submit your medical report during the selection process.** *Check which information must be included in the report* *by clicking here.* This way, we can ensure the support and accommodations you deserve. **If you don’t yet have the official disability certification, don’t worry: we can support you in obtaining it.** We have a dedicated Health and Wellness team, inclusion specialists, and affinity groups that will accompany you at every stage. Count on us to walk this journey side by side.