Harjot P.

Full stack developer and AI developer who builds SaaS products, REST APIs, AI features and automation end to end. 10 years, 45 jobs and $500K+ earned on Upwork. Web apps in React, Next.js, TypeScript, Node.js and Python, plus native iOS, Android, Flutter and React Native apps. I use Codex, Claude Code, Cursor and DeepSeek Harness daily, so you get a working MVP in week two, not week eight.

🤖 AI Developer | LLM and AI Agent Development
• LLM integration: OpenAI API (GPT-4, GPT-4o, GPT-5), Claude API (Anthropic), Gemini, DeepSeek, Llama and Hugging Face
• RAG (retrieval augmented generation), embeddings, semantic search, vector databases (Pinecone, Qdrant, pgvector), LangChain, LangGraph, LlamaIndex, Vercel AI SDK
• AI agents and agentic workflows: function calling, tool use, structured outputs, multi agent systems, MCP servers, OpenAI Agents SDK
• AI chatbots and assistants, customer support bots, conversational AI, voice AI (Whisper, ElevenLabs, speech to text), document processing, AI summarization, content and image generation, NLP
• Prompt engineering, prompt caching, streaming, evals, guardrails and token cost control
• Machine learning with Python, TensorFlow, PyTorch, scikit-learn, fine tuning, on device Core ML and Apple Intelligence

🚀 SaaS Developer | Full Stack Web Apps
• MVP to paying product in React, Next.js, Vue.js, Angular, Node.js, Express, NestJS, Python, Django, FastAPI, PHP, Laravel, Tailwind CSS, Redux, tRPC, GraphQL and WebSockets
• Databases: PostgreSQL, MySQL, MongoDB, Firestore, Redis, SQLite, Prisma, Supabase
• Cloud and DevOps: Firebase, AWS (Lambda, S3, Cognito), Google Cloud (Cloud Run, Cloud Functions), Azure, Vercel, Docker, Kubernetes, CI/CD, GitHub Actions, serverless, microservices
• Billing: Stripe (Checkout, Billing, Connect), Paddle, Lemon Squeezy, PayPal, Apple Pay, in app purchases, StoreKit 2, RevenueCat, paywalls, freemium, usage based billing
• Multi tenant architecture, authentication (Auth0, Clerk, NextAuth, OAuth, SSO, SAML, 2FA), RBAC, admin dashboards, admin panels, customer portals, CRM, ecommerce
• Landing pages, onboarding, analytics (Google Analytics, Mixpanel, PostHog), SEO, Figma to code, WordPress, Shopify, Webflow, headless CMS, GDPR, HIPAA

🔌 API Developer | Backend and Integrations
• REST API and RESTful API design, GraphQL, gRPC, WebSockets, webhooks, OpenAPI, Swagger, Postman, JWT, OAuth 2.0, API keys, rate limits, caching, versioning
• Third party API integration: Stripe, PayPal, Twilio (SMS, WhatsApp, voice), SendGrid, Google Maps, Google Sheets and Gmail APIs, Slack, WhatsApp Business API, Shopify, WooCommerce, HubSpot, Salesforce, Airtable, Notion, QuickBooks, App Store Connect API • SOAP and XML to REST and JSON migrations, CRM and ERP integration