Vishal Sah - Backend Engineer

Skills

Languages: JavaScript/TypeScript, Solidity, C/C++, Dart, SQL, Lua, Noir
Backend: Node.js, Express.js, Spring Boot, REST API Design, Rate Limiting, Authentication
Databases: PostgreSQL, MongoDB, Firebase Firestore, Neo4j, IPFS
Web3: Ethereum/EVM, Smart Contracts, ERC-20/ERC-721, Hardhat/Foundry, Ethers.js/Web3.js, Story Protocol, Lit Protocol, OpenZeppelin
Infra: AWS, NGINX/OpenResty, SSL/TLS
Tools: Git/GitHub, VS Code, Postman, Figma

April 2025 – July 2025»Software Engineering Intern, Attenomics: RAG backend with LLMs + pgvector, Jina embeddings, LangChain memory, deployed on AWS.
April 2026 – Present»Software Development Engineer, HQPL: production backend systems, architecture, API design, database optimization, infra.

ProSound: decentralized music rental via NFTs, IP on Story Protocol, TEE-encrypted access via Lit Protocol. Solidity, Hardhat, Foundry, Node.js, IPFS, Lit Protocol, Story Protocol, ERC-721 — github / live
x402-ratelimiter: domain-aware paid-API gateway, x402 micropayments, dynamic SSL, anti-scraping via NGINX/OpenResty + Lua. Node.js, TypeScript, Express, NGINX, OpenResty, Lua, PostgreSQL, x402 — github
RAG-based AI Backend System: production RAG system, LLMs + pgvector, Jina embeddings, LangChain memory, deployed on AWS. Node.js, Express, PostgreSQL, AWS, LangChain, LLMs, Vector Databases — github
SneakerSync: mobile sneaker marketplace, real-time sync, secure auth, REST APIs backed by MongoDB. Flutter, Dart, Node.js, Express.js, MongoDB, GetX, REST API — github
Streamer: live streaming platform, RTMP broadcasting, FFmpeg encoding, large-file storage via MongoDB GridFS. Node.js, Express.js, RTMP, FFmpeg, MongoDB, GridFS, REST API — github
Attenomics: social media analytics at scale, cron pipelines, ML attention metrics, 1,000+ users on AWS. Node.js, Express.js, PostgreSQL, AWS EC2, AWS RDS, Cron, REST API — github

MetaMask × 1Shot API × Venice AI Hackathon (HackQuest) — 3rd Prize: NFT-gated music rental, TEE-encrypted access via Lit Protocol, IP on Story Protocol. github / live
Fhenix Buildathon (Fhenix) — Participant: FHE-based confidential smart contracts on Fhenix L2, encrypted on-chain computation.
HackQuest Web3 Hackathon (HackQuest) — Participant: HTTP 402 micropayment gateway, dynamic SSL, anti-scraping via NGINX/OpenResty + Lua. github