Design and develop RESTful APIs using ASP.NET Core and Web API, applying best practices and design patterns.Build modern user interfaces with React.js, using functional components, hooks, and state management (Redux, Context API).Implement data access with Entity Framework/Core, LINQ, and databases such as Azure SQL and Cosmos DB.Develop unit and integration tests using xUnit, MSTest, or NUnit to ensure code quality.Deploy and maintain applications in Azure, including App Services, Functions, Service Bus, and Azure Storage.Automate CI/CD processes using Azure DevOps, pipelines, and infrastructure-as-code tools (ARM, Bicep, Terraform).Monitor and diagnose applications with Application Insights and Azure Monitor to ensure performance and availability.Apply cloud security measures (Azure Key Vault, roles, authentication/authorization) and secure software development practices.Collaborate in agile teams (Scrum/Kanban), participating in planning, estimation, and task reviews.Conduct code reviews and mentor less experienced developers, promoting best practices and continuous improvement.