Tejinder S.

I am a Senior Software Engineer and AI Solutions Architect — Top Rated on Upwork — with 12+ years of experience engineering high-impact digital products for startups and enterprises worldwide. I specialize in transforming complex business challenges into intelligent, production-grade software that drives real, measurable growth. AI & Machine Learning Development:- I build cutting-edge AI applications powered by OpenAI (GPT models), Retrieval-Augmented Generation (RAG), LangChain, vector databases, and custom LLM integrations. From AI chatbots and voice assistants to intelligent automation and knowledge-base systems, I deliver AI that works in production — not just in demos. Recent AI Products I Built & Launched:- Fari AI — an AI-powered receptionist that answers calls 24/7 with natural voice, routes customers intelligently, captures messages, and books meetings automatically. Ash AI — a voice-powered business assistant that converts leads, answers complex questions from company knowledge bases, and delivers round-the-clock customer support across web, Slack, WhatsApp, and phone. Backend & API Engineering:- Deep expertise in Python, FastAPI, Django, and Flask for building high-performance, scalable REST APIs and microservices — with PostgreSQL, MySQL, MongoDB, and Redis for data, and Docker, AWS, and CI/CD pipelines for deployment at scale. Mobile & Web Applications:- Full-stack development of modern, responsive web and mobile apps using React, Next.js, React Native, and Flutter — delivering seamless user experiences backed by robust architecture. SaaS Platform Development :- End-to-end SaaS engineering: multi-tenant architecture, subscription billing (Stripe), authentication, admin dashboards, analytics, and everything needed to take a product from concept to paying customers. Blockchain Services:- Secure blockchain development including smart contracts (Solidity), Web3 integrations, wallet connectivity, and decentralized application (dApp) architecture. E-commerce Solutions:- Revenue-driving online stores on Shopify (custom themes, apps, and API integrations), WooCommerce, and fully custom e-commerce stacks — optimized for conversion, performance, and growth. My work spans the full product lifecycle — from system architecture and API design to deployment, scaling, and ongoing optimization — with a consistent focus on performance, reliability, and business outcomes. When you hire me, you're not just getting a developer — you're getting a proven, Top Rated technical partner who delivers on time, communicates clearly, and treats your business like his own. Hire me with confidence, and I'll take your business to the next level.