Lead Web3 Backend Engineer - Hybrid (London)

Citibank (Switzerland) AG; Greater London; Hybrid; Confidential; Full time

Benefits offered by this job

27 days annual leave

Private Medical Care

Life Insurance

Pension Plan

Parental Leave

Learning resources

Job summary

Citi London is seeking a Lead Web3 Engineer to join the Digital Assets Platform. You will develop backend components linked to blockchain networks, implement wallet interactions, and deploy smart contracts in a fast-paced, enterprise environment.

You will collaborate with senior engineers, participate in code reviews, and contribute to API and documentation efforts while staying current with Web3 tooling and standards.

Qualifications

• Bachelor’s degree in CS or Engineering; MS/PhD is a plus.
• Extensive experience in full software development and testing lifecycle.
• Proven backend web development experience with Java/Spring.
• Solid experience in web3 application development is a plus.
• Familiarity with web3 libraries like Web3J and Web3JS.

Responsibilities

• Develop, test, and maintain backend components and services that integrate with blockchain networks.
• Implement blockchain integrations including node connectivity and wallet interactions.
• Write, test, and deploy smart contracts in Solidity or equivalent.
• Build APIs and microservices exposing blockchain functionality.
• Implement asynchronous processing for transaction lifecycle and state changes.
• Participate in code reviews and maintain high code quality and test coverage.
• Collaborate with architects, engineers, and product teams to translate requirements.
• Contribute to technical documentation and integration guides.
• Support debugging and troubleshooting across the blockchain stack in dev/prod.
• Follow engineering best practices and Agile delivery processes.

Skills

Blockchain development

Java backend

Web3 libraries

Asynchronous programming

Security awareness

DevOps / containers

GIT / Jira / Jenkins

Agile / Scrum

Education

Bachelor’s degree in CS or Engineering

MS or PhD in computer science (plus)

Tools

Git

Jira

Jenkins

Docker

Hardhat/Foundry

Job description

Citi London is seeking a Lead Web3 Engineer to join the Digital Assets Platform. You will develop backend components linked to blockchain networks, implement wallet interactions, and deploy smart contracts in a fast-paced, enterprise environment.

You will collaborate with senior engineers, participate in code reviews, and contribute to API and documentation efforts while staying current with Web3 tooling and standards.