Keyur S.

I build and improve business applications, API integrations and AI automation systems. My work covers backend architecture, web interfaces, databases, cloud deployment and production support, with hands-on experience in .NET/C#, Python, React and TypeScript. My project experience includes email automation across Gmail and Outlook, financial data processing and reporting, legal AI with source citations, enterprise operations software, GIS integrations and database cloning. I also develop Office add-ins and desktop applications, and maintain existing systems where changes must preserve established business rules. The work I can help with includes: - Full-stack development: ASP.NET Core, Python/FastAPI, React, TypeScript, Angular and Blazor. - AI and automation: OpenAI integration, document processing, RAG, hybrid retrieval, reranking and vector databases. - Databases and reporting: SQL Server, PostgreSQL, MongoDB, stored procedures, query optimization and reporting workflows. - APIs and integrations: REST APIs, OAuth/JWT, Microsoft Graph, Gmail, background jobs and data synchronization. - Deployment and maintenance: Azure, AWS, Docker, CI/CD, production debugging and legacy modernization. - Office and desktop software: Outlook, Excel and Word add-ins, VSTO, Office.js, WPF and Windows applications. My completed engagements include 1,730 hours on a database cloning system and 467 hours on AI and vector database development, both with 5-star client reviews. I also spent a year in Japan working with client teams on requirements and specifications. I start by understanding your workflows, requirements and existing code. I explain the technical choices, make changes in manageable steps and test the affected areas before delivery. You work directly with me, with clear documentation, regular progress updates and early communication about blockers.