Project description

Modernization as a Service (MaaS) is a cross-functional practice supporting all business verticals within the company.

We are seeking a Senior Blockchain Developer to join our project with our client, a leading financial institution in the UK.

Responsibilities

Design, build, and deploy Web3 components, including smart contracts, event listeners, wallet integrations, and protocol connectors for a digital asset platform.

Develop backend services using Java/Spring and Node.js to interface with public and permissioned blockchains through SDKs such as Web3J, Ethers.js, and Viem.

Write, test, and audit Solidity contracts to ensure security, correctness, and gas efficiency.

Implement event-driven architectures to handle on-chain events, transaction lifecycles, and state synchronization.

Support tokenization, custody, and DeFi/TradFi bridging integrations, contributing to architectural and design decisions.

Maintain engineering standards by performing code reviews, producing documentation, and participating in Agile delivery within a distributed global team.

Skills

Must have

Core / must-have:

Smart contracts: Solidity development, testing (Hardhat, Foundry, Truffle), security best practices, gas efficiency

Web3 libraries: Web3J, Web3JS, Ethers.js, Viem — integrated into enterprise backends

Backend engineering: Java/Spring and/or Node.js, API design, microservices, design patterns

Blockchain fundamentals: consensus mechanisms, transaction lifecycle, gas models, wallet infrastructure, key management

Token standards: ERC-20, ERC-721, ERC-1155, ERC-3525 and tokenization patterns

Event-driven / async architecture: on-chain event listeners, state synchronization, message queuing (Kafka, RabbitMQ)

Cryptography applied to blockchain: digital signatures, hashing, PKI, secure key management

DevOps: Docker, Kubernetes, Helm, CI/CD (Jenkins), Git, Jira, observability tooling

Education: BSc in CS/Engineering; extensive overall software engineering experience with proven hands-on Web3 delivery

Soft skills / competencies

Security mindset (reentrancy, front-running, integer overflow awareness)

Attention to detail and rigour

driven by the immutability of on-chain deployments

Curiosity and fast adaptation to a rapidly evolving ecosystem

Clear communication with engineers, architects, and non-technical stakeholders

Self-managed delivery within Agile/Scrum sprints, distributed global team collaboration

Code review participation and technical documentation

Nice to have

Permissioned/alternative networks: Hyperledger Besu, Canton, Solana

Layer 2 (Polygon, Optimism, zkSync) and cross-chain interoperability

Digital asset custody, DeFi/TradFi bridging

Financial services or other regulated-industry background

MSc

Other

Languages

English: B2 Upper Intermediate

Seniority

Senior

Related jobs

View all vacancies

Senior QA automation

Automated Testing Java

Romania

Bucharest

Senior Java Developer

Java

United States of America

Tampa

Senior Java Developer

Java

India

Pune

Remote United Kingdom, United Kingdom of Great Britain and Northern Ireland

Req. VR-124706

Java

BCM Industry

21/08/2026

Req. VR-124706

Apply for Senior Blockchain Developer in Remote United Kingdom

*Indicates a required field

First name

Last name

Your country

Your City

Phone

Specialization

Attach your resume (max file size 1MB; allowed extensions: doc, txt, pdf, docx) Upload resume

Number of years of experience in the specialization you are applying for

What are your monthly gross salary expectations?

Read Explanatory Notes

Under the terms of your specific consent or to perform our obligations under a contract with you, as applicable, we, Luxoft Holding Inc. will manually and electronically process your personal data, specifically your first name, last name, phone number, e-mail address and other data you provide us through this form.

Within this context, we process personal data only for the specific purpose(s) indicated in the individual consent language or other notices provided below.

We will – insofar as reasonably necessary for the purpose you have agreed to and within the scope of applicable laws – transfer your personal data to other entities within the Luxoft Group and to the group of third party recipients listed in our Privacy Notice. Such Recipients can be located outside the European Union (EU) and/or the European Economic Area (EEA) (“Third Countries”). The Third Countries concerned, e.g. the USA, may not have the level of data protection that you enjoy e.g. under the GDPR. This can result in disadvantages such as an impeded enforcement of data subjects’ rights, a lack of control over further processing and access by state authorities. You may only have limited legal remedies against this. Insofar our transfer of your personal data to recipients in Third Countries is not covered by an adequacy decision of the EU Commission, we achieve an adequate level of data protection as further detailed out in our Privacy Notice.

With your consent, we personalise marketing communications to you by way of carrying out marketing research analysis, analysing the surfing-behaviour of our website visitors and to adjust it to their detected tendencies, as well as to plan more efficient future marketing activities. This personalised marketing does not include any automated decision-making activities.

Further information on how we process personal data in general is available in our Privacy Notice. You may withdraw any given consent at any time. The withdrawal of your consent(s) will not affect the lawfulness of processing before its withdrawal. For any request in this context, please e-mail us at: DPO@luxoft.com.

Before uploading CV or any other information to this website, to learn more about your obligations and restrictions arising from the use of this website, please read our Terms of Use.

By clicking the Agree and Send button, you consent that Luxoft Holding Inc. can process your provided personal data for the purpose of processing your application to establish a potential employment, internship or relocation with Luxoft Holding Inc., a relevant affiliate of the Luxoft Group or Luxoft Group’s clients, as applicable. You consent to the retention of your personal data, with the purpose of contacting you for potential future employment opportunities. If you refer a friend, we will process your provided personal data of you and your referral to award you with a bonus for such recommendation. You can withdraw your consent at any time with effect for the future. Before you consent, please click on „Read these Explanatory Notes“ and view our Privacy Notice (e.g. for your data subject rights).

Note: Our system automatically converts each CV into our standardized format, enabling our HR teams to process applications more efficiently.

I consent that Luxoft Holding Inc. and the affiliates of the Luxoft Group can process my personal data for the purpose of sending me regular emails with information about Luxoft as an employer including job vacancies and (ii) marketing communications with information about recruitment-related events, organized webinars, conferences, as well as the Logeek Magazine and other similar publications. I can withdraw my consent at any time with effect for the future. These communications are personalised to my interests in accordance with our Privacy Notice.

Related Jobs

All jobs

MENU

Senior Blockchain Developer

Project description

Responsibilities

Skills

Other

Related jobs

Senior QA automation

Senior Java Developer

Senior Java Developer