Full-Stack + Blockchain Engineer — Next.js, Express, Solidity (RWA)

APAX is an EVM platform for tokenizing precious metals (gold, silver, platinum) with a strong focus on compliance and governed asset transfer. We are developing a demo. The Next.js UI is largely built (landing, login, dashboard views) but runs on mocked Zustand data. The Express + Mongo backend is partially scaffolded but not production-ready (auth and DB wiring incomplete). There is a basic ERC-20 style token on Sepolia; we still need real wallet integration, on-chain reads/writes, and a compliance-oriented contract path (ERC-3643 style identity / transfer restrictions). We are hiring for FULL end-to-end delivery by the same engineer (or a small team you lead), not frontend-only or backend-only work. What you will deliver 1) Frontend: replace mocked dashboard data with live APIs; proper loading/error states; auth-aware routes; registration if needed 2) Backend: Express + MongoDB + JWT (prefer HttpOnly cookies), protected routes, stable REST APIs, persist balance/activity (currently in-memory) 3) Blockchain: Solidity + Hardhat/Foundry, ethers.js or wagmi/viem wallet connect, on-chain balance/holder flows, extend beyond basic ERC-20 toward compliance/tokenization needs 4) Quality: clean feature-branch delivery, tests where it matters, security-minded code (no shortcuts on auth or contracts) Stack Next.js, React, TypeScript, Tailwind/shadcn, Zustand (to be replaced), Node.js, Express, MongoDB/Mongoose, JWT, Solidity, Hardhat, OpenZeppelin, ethers.js / viem / wagmi, Chainlink awareness a plus To apply, please include - GitHub username - 1–2 links showing Next.js + Express/Mongo (or very close) AND Solidity/web3 work - Hourly rate or fixed quote for full delivery - Hours per week - Realistic timeline for end-to-end delivery