Senior Engineer, Custody Engineering – Tokenization

Bullish

Senior Engineer at Bullish developing and managing tokenization features for secure digital asset architecture. Leading design, implementation, and auditing of smart contracts.

Posted 5/22/2026full-timeLondon • 🇬🇧 United KingdomSeniorWebsite

Tech Stack

Tools & technologies

JavaScriptOracleSolidityTypeScriptWeb3

About the role

Key responsibilities & impact

Drive tokenization features from concept through deployment, scaling the digital asset architecture against established industry standards.
Own the technical execution for the digital asset lifecycle, including issuance, controlled transfer, and on-chain verification.
Lead the design, implementation, and testing of the smart contracts that hold customer assets, and coordinate the audit process end-to-end.
Build and maintain the off-chain integration layer, with secure, reliable communication between the blockchain and internal systems.
Partner with product and operational compliance teams to translate cryptographic and security requirements into engineering solutions.

Requirements

What you’ll need

5+ years of software engineering experience delivering complex systems in production
Expert-level fluency in secure public chain smart contract development, such as Solidity and the Ethereum Virtual Machine (EVM), with command of industry-standard security frameworks and libraries such as OpenZeppelin.
Strong command of TypeScript for backend development, API integration, and building off-chain indexing services.
Hands-on experience with modern Web3 development tooling such as Foundry or Hardhat, and integration libraries such as Viem or Ethers.js.
Expert-level knowledge of smart contract token standards and the surrounding ecosystem's intricacies.
A paranoid security mindset, with proven expertise preventing and mitigating common smart contract vulnerability patterns (re-entrancy, oracle manipulation, access control flaws) and managing the audit process.
The ability to communicate protocol logic and security trade-offs to both technical and non-technical stakeholders across global teams.
Degree in Computer Science, Engineering, or a related technical field (or equivalent professional experience).

Benefits

Comp & perks

Competitive salary
Flexible working hours
Professional development budget
Home office setup allowance
Global team events

ATS Keywords

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Hard Skills & Tools

smart contract developmentSolidityEthereum Virtual Machine (EVM)TypeScriptAPI integrationoff-chain indexing servicessmart contract token standardssecurity frameworksOpenZeppelinsmart contract vulnerability patterns

Soft Skills

communicationcollaborationproblem-solvingtechnical leadershipsecurity mindset