Blockchain Software Developer - Digital Assets Platform

26983955 Blockchain Software Developer - Digital Assets Platform (Open)

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Job Overview

Citi is seeking a passionate and skilled Digital Assets Blockchain Web3 Engineer to join the Citi Integrated Digital Assets Platform (CIDAP) engineering team. This is a hands-on engineering role for a developer who is deeply enthusiastic about the intersection of decentralized technologies and institutional finance.

The successful candidate will contribute to the design, development, and deployment of Web3-native components and integrations that power Citi's digital asset infrastructure — spanning tokenization, smart contracts, on-chain settlement, and blockchain protocol integrations. You will work within a collaborative, globally distributed team of engineers, architects, and business technologists who are building the next generation of institutional digital finance capabilities.

We are looking for someone who brings strong Web3 engineering fundamentals, a curiosity for emerging blockchain ecosystems, and the ability to bridge decentralized technology patterns with enterprise-grade software standards.

Key Responsibilities

Design, develop, and deploy Web3 components and integrations for Citi's Digital Asset Platform, including smart contracts, on-chain event listeners, wallet integrations, and blockchain protocol connectors

Build and maintain backend services that interface with public and permissioned blockchain networks (e.g., Ethereum, Hyperledger Besu, Canton, Solana, or equivalent)

Develop, test, and audit smart contracts written in Solidity or equivalent languages, ensuring security, correctness, and gas efficiency

Integrate Web3 libraries and SDKs (e.g., Web3J, Web3JS, Ethers.js, Viem) into enterprise Java and/or Node.js backend services

Implement asynchronous, event-driven architectures to handle on-chain events, transaction lifecycle management, and blockchain state synchronization

Collaborate with architects and senior engineers to contribute to the design of scalable, secure, and resilient Web3 infrastructure

Participate in code reviews, providing and receiving constructive technical feedback to maintain high engineering standards

Support the integration of digital asset custody solutions, tokenization frameworks, and DeFi/TradFi bridging components

Contribute to technical documentation, including smart contract specifications, integration guides, and architecture notes

Stay current with the rapidly evolving Web3 ecosystem — tracking protocol upgrades, new token standards, Layer 2 solutions, and emerging tooling relevant to institutional use cases

Work within Agile/Scrum frameworks, participating in sprint planning, stand-ups, and retrospectives within a distributed global team

Help identify and resolve technical issues across the Web3 stack, escalating where appropriate to ensure delivery quality and timelines

Qualifications / Experience

Bachelor's degree in Computer Science, Engineering, or a related discipline; MS is a plus

Extensive overall software engineering experience, with a strong backend development foundation

Proven hands-on experience in Web3 and blockchain application development, including smart contract development and blockchain protocol integration

Solid experience with backend development using Java/Spring, Node.js, or equivalent enterprise frameworks

Proficiency in Solidity smart contract development, including testing frameworks (Hardhat, Foundry, Truffle) and security best practices

Hands-on experience with Web3 libraries such as Web3J, Web3JS, Ethers.js, or Viem

Solid understanding of blockchain fundamentals — consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, and key management

Experience with token standards (ERC-20, ERC-721, ERC-1155, ERC-3525, or equivalent) and tokenization patterns

Familiarity with blockchain networks (Hyperledger Besu, Solana, Canton) is a strong plus

Experience with asynchronous programming, event-driven systems, and message queuing (Kafka, RabbitMQ, or equivalent)

Familiarity with DevOps practices, containerization (Docker, Kubernetes), and CI/CD pipelines

Understanding of cryptographic concepts — digital signatures, hashing, PKI, and secure key management — as applied to blockchain systems

Exposure to Layer 2 scaling solutions (Polygon, Optimism, zkSync, etc.) and cross-chain interoperability protocols is a plus

Experience in financial services or regulated industries is a plus

Familiarity with Agile/Scrum methodologies and distributed team collaboration tools

Competencies / Skills

Web3 Engineering Depth: Strong command of the Web3 technology stack — from smart contract development to on-chain/off-chain integration patterns and blockchain node interaction

Backend Engineering Fundamentals: Solid grounding in enterprise software engineering — API design, microservices, data structures, algorithms, and design patterns

Security Mindset: Awareness of common smart contract vulnerabilities (reentrancy, front-running, integer overflow, etc.) and best practices for secure on-chain development

Curiosity & Adaptability: Genuine enthusiasm for the Web3 ecosystem and the ability to rapidly learn and apply new protocols, standards, and tooling

Collaborative Spirit: Strong team player who communicates clearly and constructively with engineers, architects, and non-technical stakeholders

Delivery Orientation: Ability to manage personal delivery commitments, prioritize effectively, and produce high-quality output within sprint cycles

Attention to Detail: Rigorous approach to testing, code quality, and documentation — particularly important given the immutable nature of on-chain deployments

Tooling Proficiency: Working knowledge of engineering tools including Git, Jira, Jenkins, Hardhat/Foundry, Docker, Helm, and observability platforms

Development Value

As a Blockchain Software Developer at Citi, you will be at the forefront of one of the most exciting and strategically significant technology domains in institutional finance. You will:

Work on real-world, production-grade Web3 infrastructure at the scale and complexity of a global systemically important bank

Gain deep exposure to institutional digital asset use cases — including tokenized securities, digital cash, on-chain settlement, and programmable finance

Collaborate with world-class engineers, architects, and business leaders who are defining the future of digital finance at Citi

Build expertise across both Web3-native and enterprise technology stacks, making you a uniquely versatile engineer in a rapidly growing field

Access continuous learning opportunities, including emerging protocol research, industry conferences, and internal innovation programs

Contribute to a platform with global reach and real commercial impact, with visibility across Citi's technology and business leadership

Citi is an equal opportunity and affirmative action employer. Qualified applicants will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.

What we’ll provide you

By joining Citi London, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:

27 days annual leave (plus bank holidays)

A discretional annual performance related bonus

Private Medical Care & Life Insurance

Employee Assistance Program

Pension Plan

Paid Parental Leave

Special discounts for employees, family, and friends

Access to an array of learning and development resources

Visit our Global Benefits page to learn more.

Alongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.

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Job Family Group:

Technology------------------------------------------------------

Job Family:

Applications Development------------------------------------------------------

Time Type:

Full time------------------------------------------------------

Most Relevant Skills

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Other Relevant Skills

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Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.

If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.

View Citi’s EEO Policy Statement and the Know Your Rights poster.