Rizwan Ansar

Built production AI features in .NET products, including RAG pipelines over company documents and integrations with OpenAI and Gemini. Integrated Shopify, Salla, and Zid APIs into internal systems and performed data imports. Integrated Stripe and Bank payment merchants with webhook-based payment handling and reconciliation, plus Noon Payments integration. Deployed production and staging releases daily to Linux VPS servers using systemd services, publishing .NET APIs and Next.js apps, restarting services, and validating releases via logs. Developed RESTful APIs with ASP.NET Core and modular monolith architecture, tested before QA handover, resolved production defects, and documented integrations and configurations. Led frontend-to-backend integration and automated document generation using iText7 (PDF) and ClosedXML (Excel).

Delivered and operated a live marketplace platform for 10,000+ users, covering the ASP.NET Core API, a React admin panel, and a React Native consumer app. Integrated Stripe payments with secure checkout, push notifications, and PDF invoice generation for orders. Rebuilt the backend as data volume grew by optimizing queries and improving response times to keep the platform fast and reliable.

Built a meeting intelligence platform that records, transcribes, and answers questions about meetings using FastAPI, Gemini embeddings, and Pinecone, with isolated Docker bots per meeting. Developed Flutter mobile apps including a buyer/seller marketplace with Stripe payments, real-time bid/order updates via SignalR, offline storage, map routes, and signature capture for proof of delivery. Contributed to a credit assessment platform using Java microservices, with a Python data layer for cross-source identity resolution, AWS Cognito sign-in, and infrastructure provisioned via Terraform.