Senior Smart Contract Engineer

strong>About CoinList br> br> /strong>CoinList is building the distribution network for onchain capital markets. Through its Passage platform, CoinList provides the infrastructure that lets any wallet, app, or platform embed access to tokenized assets, from equities and funds to token sales and other real-world assets, through a single integration. With a network of over 12M investors and more than $1.2B in transactions, CoinList connects asset issuers with the platforms and investors who want access to them. br> br>Today, CoinList is scaling two core businesses: br> br> ul> li>Passage (B2B Infrastructure) (passage.coinlist.co): Onchain Infrastructure for Capital Markets. Passage allows issuers to run compliant raises on our platform or embed CoinList s deal flow into their own products via APIs and SDKs /li> li>The Consumer Marketplace (coinlist.co): The world s leading destination to invest in token sales, pre-IPO stocks, tokenized equities, and on-chain funds. Through its token sale platform, CoinList has launched many of the leading crypto protocols including Solana, Near, USD.AI, and Ondo. br> br> /li> /ul> strong>About This Role br> br> /strong>We have a strong engineering team with deep expertise in infrastructure, blockchain, and specialized domains. We are looking for a smart contract engineer who can strong>build smart contracts /strong> to integrate with different asset providers (Ondo, Centrifuge, etc.). Those smart contracts act as a proxy between our users and the underlying assets. They offer a common interface so we can build similar products on top of them. br> br>You d be joining a small engineering team and directly reporting to the CTO in a greenfield-heavy environment where your work directly affects velocity, company direction, and revenue. br> br> strong>What You ll Do br> br> /strong> ul> li>You ll ship contracts to mainnet. We are investing in Solidity on EVM chains. This is where most of your work will live, reviewed by external auditors, deployed, and holding user funds. We move fast while keeping the technical bar as high as possible /li> li>You ll design contract systems, not just functions. As a senior engineer, we expect you to design systems from the ground up, including boundaries, interfaces, storage layout, upgrade strategy, access control, and emergency paths. You ll also help decide what even belongs onchain at all /li> li>You ll be an owner. As part of a small team, everyone owns meaningful work, whether it s the contracts behind a critical token sale or leading our onchain work on a new product /li> li>You ll treat security as the job. Adversarial review of your colleagues contracts and of external audit findings, fuzzing and invariant tests, deployment rehearsals on testnets, and monitoring and incident response are all expected /li> li>You ll rapidly grow and improve. You ll be working with incredibly smart engineers who love to learn and teach each other. And if you want to extend your craft to Rust and the Solana runtime, we ll invest in that with you br> br> /li> /ul> strong>Requirements br> br> /strong> strong>What We re Looking For br> br> /strong> ul> li>You bring over 7 years of professional working experience, including at least 2 years of writing Solidity that reached production /li> li>You know the EVM from the inside. Storage layout and packing, gas mechanics, memory versus calldata versus storage, ABI encoding, events and indexing, contract size limits, and the tradeoffs hiding inside each one /li> li>You know the modern Solidity patterns. Proxies and upgradeability, role-based access control, signature verification and replay protection (EIP-712), reentrancy and oracle or price-manipulation defenses /li> li>You have real tooling and testing discipline. Foundry (preferred) or Hardhat, fork tests, fuzzing and invariants, and a testing workflow you can justify from first principles rather than because it s what the tutorial did /li> li>You think like an attacker before you ship. You ask what a flash loan, an MEV bot, or a malicious token does to your code, and you write down what you find /li> li>You like to ship high-quality code. You make deadlines for yourself, and you move fast. You focus on the things that matter and push back on things that don t. People know they can count on you to get things done br> br> /li> /ul> strong>How You Work br> br> /strong> ul> li>You re AI-fluent. You integrate AI tools into your daily workflow naturally (not for token-burning, just for moving faster) /li> li>You re product-minded. You care about what you re building and why, not just how /li> li>You re independent but collaborative. You can move fast on your own and know when to loop others in /li> li>You re comfortable with ambiguity. You don t need perfect requirements to start building /li> li>You have strong written communication, which is especially important in a distributed, remote-first team br> br> /li> /ul> strong>Other Preferred Qualifications br> br> /strong> ul> li>Rust and Anchor, or Solana programs in production: SPL tokens, program-derived addresses, token extensions, compute-unit optimization /li> li>DeFi protocol depth: lending, AMMs, vaults (ERC-4626), staking and reward accounting /li> li>Account abstraction (ERC-4337): smart accounts, paymasters, bundlers br> br> /li> /ul> strong>Benefits br> br> /strong>Remote Work & Time Zones br> br> ul> li>Fully remote, U.S. based /li> li>We re primarily based on the US East and West Coasts, but you should be comfortable overlapping some hours with non-US time zones to work with employees abroad. br> br> /li> /ul> strong>Compensation & Benefits br> br> /strong> ul> li>Base Salary: $170,000 - $190,000 (based on experience and jurisdiction) /li> li>Equity: CoinList is a high-growth startup, and equity is a significant part of your total compensation /li> li>Benefits: /li> ul> li>Medical, dental, and vision at no monthly cost (US only) /li> li>Unlimited PTO /li> li>Monthly AI tool budget br> /li> /ul> /ul>At CoinList, we are proud to be an Equal Opportunity Employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.