Khurram S.

If you are looking for a developer who can take complete technical ownership of your system—from database architecture to secure AI integration—I am here to help. I specialize in building multi-tenant SaaS platforms, modernizing backend codebases, and safely integrating AI/LLM agents into existing databases. On Upwork, my business is built on long-term trust. My average client relationship lasts 2 to 4 years because I focus on writing clean, scalable code that reduces your API bills and technical debt. --- ### 🚀 RECENT HIGH-IMPACT DELIVERABLES 1. Secure Text-to-SQL AI Assistant - Built a secure Text-to-SQL query generation engine using LangChain Expression Language (LCEL) and PyMySQL deployed on AWS Lambda. - Hardened security by implementing dynamic query parsing to prevent SQL injection and cross-tenant data leaks. - Synchronized AI logic with enterprise backend constants (Java constants for open/closed invoices, freight logic, and cost analysis). 2. SaaS Architecture & Multi-Tenancy - Refactored a monolithic backend into a multi-tenant SaaS platform with shared-database partitioning. - Implemented dynamic host/subdomain routing middleware using AsyncLocalStorage for thread-scoped tenant isolation. - Built dynamic frontend branding injection systems and administrative super-consoles. 3. Resilient API & Batch Processing Pipelines - Engineered a local OCR (Tesseract) + Groq LLM pipeline to process thousands of book pages, bypassing expensive cloud APIs. - Built rate-limiting guardrails (TPM/RPM pacing) and a stateful auto-resume CSV engine to prevent data loss on API crashes. - Integrated eBay SDK & Polk SOAP APIs with self-healing OAuth token renewal loops. --- ### 🛠️ TECHNICAL MATRIX - Languages: Java (Spring Boot 3, Hibernate), C#/.NET, Kotlin, Node.js, Python - AI/Data: LangChain (LCEL), OpenAI/Gemini APIs, PyMySQL, Vector DBs, Elasticsearch - Frontend: React (Redux, Vite), Vue.js, WPF/XAML, Bootstrap 5 (RTL layout) - Cloud & DevOps: AWS (Lambda, S3, EC2, SQS), Docker, CI/CD, Nginx reverse proxy --- If you have a complex system that needs stabilization, or a database you want to supercharge with safe, production-ready AI tools, click the "Invite" button to start a conversation.