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HHussain C

IndexWork

Six open files, and a lot more under NDA.

Most of what I build ends up inside someone else's product. Six I can show you, four of them only here and never on a search page. The rest is listed by role and stack only.

Private work

Most of my best work belongs to someone else.

Products under NDA, and crypto projects that have since closed. Here's the shape of it. Names and details stay private, but I'm happy to walk you through the engineering on a call.

Private work under NDA: year, role, stack, scope and complexity. Client names are withheld.
2025Name withheld under NDAAILead AI engineer
  • Python
  • OpenAI
  • RAG
  • PostgreSQL
Multi-step agent · 3 integrations · eval suiteComplexity 5 of 5
2025Name withheld under NDAAIAI engineer
  • Claude
  • Tool calling
  • Node.js
Agent with typed tools · human review stepComplexity 4 of 5
2024Name withheld under NDAAILead engineer
  • Next.js
  • OpenAI
  • pgvector
Search over private documents · cited answersComplexity 4 of 5
2024Name withheld under NDAProductFull-stack engineer
  • Laravel
  • React
  • Stripe
Multi-tenant dashboard · role-based accessComplexity 3 of 5
2023Name withheld under NDAProductMobile lead
  • React Native
  • Node.js
  • AWS
iOS and Android · offline syncComplexity 3 of 5
2019Name withheld under NDAWeb3Lead blockchain developer
  • Solidity
  • Node.js
  • Bitcoin Core
Multi-chain integrations · key managementComplexity 5 of 5
2018Name withheld under NDAWeb3Lead smart contract developer
  • Solidity
  • Ethereum
  • Truffle
Upgradeable contracts · public verificationComplexity 4 of 5
2017Name withheld under NDAWeb3Lead blockchain developer
  • QTUM
  • Solidity
  • Node.js
Token contracts · REST API over the chainComplexity 3 of 5

+ 120+ more engagements, all private

Under NDA

Contact

Tell me what you're trying to fix.

I read every message myself and usually reply the same day. A rough idea is enough to start.

Or send a short brief

Hours

Your hours work for me.

  • San Francisco

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  • New York

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  • London

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  • Berlin

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  • Dubai

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  • Singapore

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  • Sydney

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  • Surat

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    Me

I keep flexible hours and move my day to overlap with yours, whether that's a morning standup in New York or a late release in Sydney.