Senior/Lead .NET developer with strong Azure (freelance)

The client is building an AI-powered platform optimizing the full field-work cycle of consultants, turning dispersed data into actionable business recommendations. The solution is built on a modular Azure architecture with a controlled RAG layer, ensuring full auditability, data sovereignty, and seamless integration with the client's existing technology ecosystem.

• Very strong .NET experience (.NET 8+ and C# at senior/lead level)
• Experience with Azure cloud environments: Entra ID (SSO, MFA, RBAC), Azure SQL, App Service or Container Apps, Blob Storage, Key Vault
• Docker and Terraform experience
• Integration experience: REST API and OpenAPI (documentation, contracts, versioning)
• Strong knowledge of SQL Server and EF Core (migrations, query optimization)
• Experience with data warehouses
• Application security knowledge: data isolation, encryption, auditability
• Proficiency with AI tooling such as GitHub Copilot
• Strong communication skills and ability to clearly articulate technical ideas
• Very good English (spoken and written)

Nice to have:

• Clean Architecture / CQRS, MediatR
• Polly (retry, circuit breaker) and external API integration
• Basic understanding of RAG and LLM APIs (session context, conversation history)
• xUnit, integration testing
• Angular — sufficient proficiency to design API contracts for frontend needs

• Designing and delivering secure, scalable, and maintainable .NET 8+ / C# backend solutions within a cross-functional Agile team
• Building and maintaining REST APIs with full OpenAPI documentation, versioning, and contract-first design to support frontend and third-party integrations
• Working with Azure cloud services including Entra ID (SSO, MFA, RBAC), Azure SQL, App Service or Container Apps, Blob Storage, and Key Vault
• Implementing and maintaining data access layers using EF Core and SQL Server, including migrations, query optimization, and data warehouse integrations
• Ensuring application security best practices: data isolation, encryption, and auditability
• Contributing to infrastructure automation using Docker and Terraform
• Providing technical guidance, participating in solution design, and supporting architectural decisions across the team
• Troubleshooting and maintaining existing codebases, including components developed by other engineers
• Leveraging AI development tools (e.g. GitHub Copilot) to enhance productivity and code quality
• Documenting technical decisions, architecture, and progress in accordance with project and compliance requirements
• Preparing reliable estimates and taking full ownership of assigned deliverables
• Staying current with modern engineering practices and emerging technologies relevant to the stack