Staff Protocol Engineer

New York City. Posted 2 days ago

The role

You will own the smart contracts that settle trades and the offchain services that route, trigger and track them. The work covers execution, cross-chain routing and indexing of onchain data for millions of users.

What you will do

Design and ship smart contracts for trade execution, focused on security, simplicity and gas efficiency
Build cross-chain execution, including solver and intent-based routing
Own trigger execution for limit orders, stop losses and other automated trades
Design indexing and serving of onchain data for portfolios, PnL and the social feed
Debug production issues at the EVM level, including reverted transactions, gas spikes and chain reorgs
Set the bar for protocol security through design reviews, testing and work with external auditors

Required qualifications

Staff+ level engineer with 6+ years of experience, able to plan and execute autonomously
Deep understanding of the EVM
Production experience writing and shipping smart contracts in Solidity
Experience building offchain systems that interact with contracts at scale (execution bots, relayers, solvers, keepers or indexers)
Strong grasp of DeFi primitives: AMMs, aggregators, MEV and how transactions land onchain

Nice to have

Experience with cross-chain infrastructure such as bridges, intents or solver networks
Experience with Solana or other non-EVM chains
Familiarity with Foundry, Slither, Echidna or formal verification, and experience working through external audits
Rust or Go experience, or familiarity with client internals (geth, reth)
An active onchain trader

Benefits

Competitive cash compensation and equity
Comprehensive health insurance: medical, dental and vision for you and your dependents
Tax savings benefits such as HSAs and FSAs
401(k) with match
Group term life insurance
Flexible time off
Annual company offsites

Before you apply

Everyone on the team uses the app to understand what to improve

About the company

fomo is a trading app that has onboarded over 3.4 million users and made over $100M in revenue since launching in May 2025. It has raised about $100M from investors including Benchmark, Index Ventures and Union Square Ventures.