Himanshu Pandey

React, Node.js, Express, MongoDB, Zod, Cloudinary

• Hardened API surface with runtime Zod payload validation eliminating NoSQL injection vectors, Helmet security headers, and modular IP rate-limiters; sustained zero security incidents across 500+ course enrollments.
• Built a stateless media pipeline (Multer → Cloudinary CDN) and sandboxed YouTube Player iframes to neutralize digital piracy; structured Winston rolling logs for real-time audit trails.

React 19, TypeScript, Node.js, MongoDB, Redis, BullMQ, Groq/OpenAI

• Automated ingestion of articles and YouTube transcripts into a MongoDB Atlas vector index; RAG pipeline via Groq and OpenAI APIs delivers sub-2s context-grounded responses across 1,000+ stored knowledge chunks.
• Architected a Redis + BullMQ async queue with freemium billing gates; engineered oEmbed fallback orchestration to bypass data-center IP blocks and streaming 429 rate errors with 100% ingestion success.
• Secured multi-tenant data with JWT + Google OAuth 2.0, bcrypt hashing, and Zod schema validation; cross-layer deduplication in the OAuth callback eliminated duplicate account creation entirely.

Next.js, Node.js, Redis, BullMQ, PostgreSQL, Docker

• Engineered a four-tier decoupled webhook delivery system routing 10,000+ payloads/min from serverless Next.js ingestion to stateful Node.js workers via Redis, eliminating cold-start timeout failures entirely.
• Guaranteed zero data loss via exponential backoff retries and a PostgreSQL Dead Letter Queue (DLQ); HMAC SHA-256 signature verification and idempotency keys enforced end-to-end payload integrity.
• Deployed containerized workers via Docker with token-bucket rate limiters controlling ingestion velocity; architecture sustained sub-200ms delivery p99 under sustained load.

React 19, Node.js, Python, FastAPI, SQLite, Groq

• Architected a decoupled three-tier microservice ecosystem featuring a Dual-Agent triage system that actively intercepts LLM responses to screen for medical emergencies.
• Engineered a clinical memory store in SQLite that injects historical user context alongside RAG-driven PubMed citations and USDA nutritional facts.
• Ensured Zero-Data-Retention compliance by building a Node.js proxy that dynamically scrubs PII before routing sanitized prompts to the external Python Groq AI engine.

• Completed a rigorous 5-course curriculum covering advanced prompt engineering frameworks, productivity optimization, and responsible AI architectures.
• Mastered practical generative AI strategies to accelerate software development workflows, automate data-driven problem solving, and mitigate algorithmic bias.