Company Description We're partnering with Quant, a global leader in digital transformation and technology solutions, seeking a Senior Protocol Engineer to join their team. About Quant: Almost all the money in the economy is commercial bank money, and almost none of it moves on chain. Quant is a leading provider of programmable money infrastructure, and our technology changes that: it lets banks issue, move and settle tokenized deposits around the clock, automatically and securely, while staying connected to the systems they already run on. It is already deployed in regulated environments with central and commercial banks in the UK and around the world, including work on the digital pound and the digital euro. The Clearing House, whose networks clear and settle more than $2 trillion a day, has now selected Quant to power its On-Chain Money Initiative: a new interoperable payments network that will let financial institutions of all sizes clear and settle tokenized deposits, with connectivity to the RTP® and CHIPS® networks. Our technology provides the network's interoperability, orchestration and transaction-management layer, enabling payments that settle immediately and transactions that trigger automatically once agreed conditions are met. Through our Tokenized Deposits-as-a-Service solution, banks of any size can join without building new infrastructure themselves. The network is expected to become available to participating institutions in the first half of 2027, with use cases across corporate treasury, liquidity management, cross-border payments and digital asset settlement. We are building the New York team that will run it. Job Description Senior Protocol Engineer Role summary Owns significant workstreams within the smart-contract release train (TD Coin, Settlement Orchestrator, Fiat Relay, Fusion Root, Orchestrator Factory) and contributes to maintaining the Fusion-specific upstream diff against Optimism, guiding Protocol Engineers through implementation. Key responsibilities • Design and build components within the smart-contract release train. • Contribute to maintaining and testing the Fusion-specific upstream diff against Optimism. • Guide Protocol Engineers through implementation and review their work. • Carry the on-call escalation rotation and join incident bridges for protocol-behavior issues. • Support external audit preparation and remediation for assigned components. Qualifications Required experience & qualifications • 5+ years in blockchain/DLT, smart-contract engineering or backend distributed systems. • Strong Solidity/EVM (or equivalent) and integration skills. • Experience with rollup/upstream-diff maintenance (Optimism stack or comparable) an advantage. • Comfort carrying production on-call responsibility. Success measures • On-spec, on-time delivery within the release train. • Post-release defect and rework rate. • On-call response within target.