Underground Administration LLC is hiring a

Web3 Solidity Engineer

Solidity Engineer – Quant Finance / Digital Assets
Hybrid | Tampa FL or Jersey City NJ
$141-160 K base + 20 % bonus | No visa sponsorship

Why this role

• Institutional scale meets Web3 – write production Solidity that underpins 9-figure derivatives and collateral flows.

• Green-field build – help architect the firm’s first cross-chain settlement layer and on-chain risk engine.

• Seat at the table – work directly with quants, traders, and the Chief Risk Officer; your code ships to mainnet, not a sandbox.

What you’ll own

• Design, test, and deploy Solidity smart contracts for swaps, repos, and collateral margining.

• Translate stochastic pricing models from the quant team into on-chain logic and oracles.

• Build cross-chain bridges (L1 ↔ L2) and contribute to the firm’s open-source libraries.

• Run threat-model workshops; drive audits, fuzzing, and automated exploits (Slither, Foundry, Mythril).

• Pair with backend (TypeScript/Node) and front-end (React/Next) teams to ship full-stack features.

• Keep a pulse on EIPs, MEV vectors, and DeFi exploits—feed lessons back into our secure-coding playbook.
  

You’ll fit if you bring

Must-have

Ideal-plus

7+ yrs hands-on software engineering, 2+ in Solidity

MSc/PhD in CS, Quant Fin, or Applied Math

Deep grasp of derivatives math, collateral flows, VaR/Greeks

Prior build for DeFi lending, DEX, or on-chain options

Hardhat / Foundry power-user; CI on GitHub Actions

Experience with Chainlink or Pyth data feeds

Strong TypeScript or Python for testing & data plumbing

Rust or Go micro-service chops

Proven secure-coding mindset; past audit or CTF participation

Published open-source Solidity package or EIP draft

Comp & logistics

Tampa, FL

Jersey City, NJ

$140 K – $150 K base

$150 K – $160 K base

Up to 20 % annual bonus · 401(k) match · full health & dental · hybrid schedule (3 days on-site).

Apply Now: