About this role
Salary: £62,000 - 102,000 per year
Requirements: Bachelors degree in Computer Science, Engineering, or a related discipline; a masters degree is a plusExtensive overall software engineering experience with a strong backend development foundationProven hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integrationSolid experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworksProficiency in Solidity smart contract development, including testing frameworks such as Hardhat, Foundry, or Truffle, and security best practicesHands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or ViemSolid understanding of blockchain fundamentals, including consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key managementExperience with token standards such as ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent, and tokenization patternsFamiliarity with blockchain networks such as Hyperledger Besu, Solana, or Canton is a strong plusExperience with asynchronous programming, event-driven systems, and message queuing such as Kafka or RabbitMQFamiliarity with DevOps practices, containerization such as Docker and Kubernetes, and CI/CD pipelinesUnderstanding of cryptographic concepts such as digital signatures, hashing, PKI, and secure key management as applied to blockchain systemsExposure to Layer 2 scaling solutions and cross-chain interoperability protocols is a plusExperience in financial services or regulated industries is a plusFamiliarity with Agile/Scrum methodologies and distributed team collaboration toolsStrong command of the Web3 technology stack, from smart contract development to on-chain/off-chain integration patterns and blockchain node interactionSolid grounding in enterprise software engineering, including API design, microservices, data structures, algorithms, and design patternsAwareness of common smart contract vulnerabilities and best practices for secure on-chain developmentGenuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and toolingStrong team player who communicates clearly and constructively with engineers, architects, and non-technical stakeholdersAbility to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cyclesRigorous approach to testing, code quality, and documentationWorking knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms Responsibilities: Design, develop, and deploy Web3 components and integrations for our Digital Asset Platform, including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connectorsBuild and maintain backend services that interface with public and permissioned blockchain networksDevelop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiencyIntegrate Web3 libraries and SDKs into our enterprise Java and/or Node.js backend servicesImplement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronizationCollaborate with architects and senior engineers to design scalable, secure, and resilient Web3 infrastructureParticipate in code reviews and provide constructive technical feedbackSupport the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging componentsContribute to technical documentation, including smart contract specifications, integration guides, and architecture notesStay current with the evolving Web3 ecosystem, including protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use casesWork within Agile/Scrum frameworks and participate in sprint planning, stand-ups, and retrospectives within a distributed global teamHelp identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines Technologies: APIBackendBlockchainCI/CDDevOpsDockerGitHelmSupportJIRAJavaJenkinsKafkaKubernetesRabbitMQSecuritySoliditySpringWeb3microservicesNodeJSEthereum More:
We are Citi, a global organization of more than 230,000 people, and we are building our Citi Integrated Digital Assets Platform engineering team in London. This is a hands-on role focused on the intersection of decentralized technologies and institutional finance, where you will help us design and deliver production-grade Web3 infrastructure for tokenization, smart contracts, on-chain settlement, and blockchain integrations. You will join a collaborative, globally distributed team of engineers, architects, and business technologists, with access to continuous learning, internal innovation programs, and the opportunity to make a real impact on the future of digital finance. In London, we offer a business casual workplace with a hybrid working model of up to 2 days working from home per week, a competitive base salary reviewed annually, 27 days of annual leave plus bank holidays, discretionary performance bonus, private medical care and life insurance, an employee assistance program, pension plan, paid parental leave, employee discounts, and learning and development resources. We are committed to an inclusive workplace where everyone can thrive.
last updated 36 week of 2026