Freelance - C Full Stack Developer

Job Overview

We are looking for a Senior C# Full Stack Developer / Technical Lead with 10+ years of experience to enhance and support an internal AI-enabled RFP/DDQ platform built using .NET, Angular, Azure AI Search, Azure SQL, and Azure services.

The ideal candidate should be strong in both full-stack development and AI-powered document processing, with hands-on experience building scalable APIs, enterprise UIs, search solutions, document parsing pipelines, embeddings, and Azure-based applications.

Key Responsibilities

• Develop, enhance, and support enterprise applications using .NET 9 Web API, C#, Angular 21, and Azure.
• Work with business and investment/credit teams to define requirements, execution plans, testing, troubleshooting, and releases.
• Design and maintain Azure AI Search solutions using vector and hybrid search.
• Build document processing pipelines for PDF, DOCX, and XLSX files, including parsing, extraction, chunking, metadata processing, and indexing.
• Work with embeddings and Azure OpenAI/LLM integrations for AI-powered search and document retrieval.
• Develop and optimize EF Core 9, Azure SQL, migrations, complex LINQ queries, and database schemas.
• Implement Microsoft Entra ID/Azure AD authentication and role-based authorization using MSAL, App Roles, and Microsoft Graph.
• Build responsive enterprise UIs using Angular, PrimeNG, and AG Grid Enterprise.
• Implement background and asynchronous processing using Azure Functions, hosted services, and queued workloads.
• Monitor and troubleshoot applications using Application Insights.
• Manage SDLC activities through Azure DevOps, Git, and GitHub.
• Work independently as well as within an Agile development team with minimal supervision.
• Utilize modern AI-assisted development tools such as Claude Code, GitHub Copilot, and DevBox.

Required Skills

• Experience in C# / .NET full-stack development or technical leadership.
• Strong hands-on experience with .NET 9 Web API and C#.
• Strong Angular 21 experience, including standalone components and signals.
• Strong understanding of async/await and dependency injection.
• EF Core 9 and Azure SQL.
• Azure AI Search – vector/hybrid search and indexing.
• Experience with document parsing, extraction, chunking, embeddings, and document indexing.
• Experience with Azure Functions and Azure App Service.
• Microsoft Entra ID/Azure AD, MSAL, App Roles, and Microsoft Graph.
• PrimeNG and AG Grid Enterprise.
• Application Insights and application troubleshooting.
• Azure DevOps and Git/GitHub.
• Experience working with AI coding/development tools and DevBox.

Nice to Have

• Financial services or credit-domain experience.
• Experience with Azure OpenAI and LLM-based applications.
• Experience developing RFP, DDQ, proposal, or document-management platforms.
• Experience processing PDF, DOCX, and XLSX documents.
• Experience with RAG, vector databases, embeddings, and semantic search.