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
- £63k - £82k per annumEstimatedPosition Summary: The Senior Medical Writer/Principal Medical Writer will be responsible for leading the development of high-quality and... ..., writing, editing/formatting, and performing QC review. Develops documents in compliance with Precision MW Style Guide, Precision...SeniorFull-time
- Company: NICOLL CURTIN TECHNOLOGY Job Type: PermanentSeniorPermanent
- Company: W6 RESOURCES Job Type: ContractSenior
- Company: WE ARE ORBIS GROUP LTD Job Type: ContractSeniorHybrid working
£375 - £450 per day
...pipeline optimisation Security monitoring, threat detection and incident response Working within a security operations centre at a mid-senior level SC clearance held or ability to pass Interested? Please apply below. SOC Engineer, Senior SOC Engineer, Security...SeniorRemote£40.5k per annum
...psychologists and the wider psychological professions in the UK. As Senior Policy & Public Affairs Adviser you will have a great... ...networks, political and government stakeholders, analysing policy developments and seeking opportunities to influence national policy on behalf...Senior£65k - £75k per annum
Are you a Senior Creative who is looking for an experiential agency who doesn't do "nice ideas" ... and allows you creative flexibility? Our experiential agency client builds goosebump-inducing, jaw-dropping experiences for their global clients and they are now looking for a...SeniorPermanentImmediate startRemote£80k - £100k per annum
Looking to SCOOT up the career ladder? Or is your job not giving you the DRIVE it once was? Well one of the world’s leading micro-mobility companies is looking to build out a European team to support their US base as the company looks to expand this side of the pond. This...SeniorRemote jobPermanent- ...emerging platforms. * A strong understanding of social trends, platform behaviours and what makes audiences engage. * Experience developing social creative playbooks and guidelines that turn brand strategy into actionable creative direction. * Confidence briefing and...Senior
£65k per annum
Job Description Dynamics NAV, Dynamics 365 Business Central, Gold Partner, Senior Consultant, Lead NAV Consultant. One of the UK’s leading Microsoft Gold Partners has an exciting and challenging new role for a Senior or Lead Dynamics NAV Consultant to be involved in the...SeniorPermanentWork from home£33k - £48k per annum
...specialises in the built environment. We deliver planning communications and public relations campaigns to create positive change from new developments. The role: Meeting Place has an exciting opportunity for someone who wants to make a difference. There’s consensus that our...Senior£90k - £100k per annum
...progress your abilities. You will be building out the company's cloud infrastructure with Terraform on their AWS platform. You will be developing CICD pipelines in Gitlab/Github action and will be using your containerisation experience with Kubernetes and Docker. You will be...SeniorRemote jobPermanent- ...A client of mine in the FinTech space are on the look out for a senior 6 month contract to start in the next 4/5 weeks as they are rolling out a number of products. Main Responsibilities: Manage, maintain and support their AWS and Heroku environments Build appropriate...SeniorRemote job
£70k - £90k per annum
...to use your engineering skills? This company is looking for a Senior SRE to help build a revolutionary team of people who are passionate... ...SRE, you will work closely with engineers in different teams to develop common patterns and templates for all production teams to consume...SeniorRemote jobPermanent£70k - £80k per annum
...Develop a platform enabling positive changes to the world. This company is a scaling investment fund that has established itself for over... ..., they are looking to expand their team and are looking for a senior to come in and provide great foundational knowledge to platform the...SeniorRemote jobPermanent£100k - £120k per annum
...We have an exciting opportunity for a hands-on Senior Product Manager/ Senior Mobile App Product Manager to join a rapidly scaling AI-... ...across a fast-growing consumer app. You will play a key role in developing social and community experiences to drive engagement, retention...SeniorRemote jobPermanentVisa sponsorship£90k per annum
...in Central London) An opportunity to work at the forefront of media & campaign transformation, shaping the future of AdTech. As a Senior Project Manager, you will take full ownership of end-to-end delivery of major AdTech projects for some of the UK’s leading media...SeniorRemote jobPermanent- ...If you're looking for your next Senior DevOps contract, utilising your extensive AWS, Terraform and Kubernetes experience, this could be the contract for you! In this role you will join as a Senior DevOps Engineer, working with a fully remote team. You'll be tasked with building...SeniorRemote job
£75k - £90k per annum
...they say they have the most exciting data set in the country! As a Senior Cloud Engineer, you’ll be applying architectural and engineering principles to define and deliver technology that will improve developer efficiency. in addition, you'll own the designing, building and...SeniorRemote jobPermanent- £46k - £61k per annumEstimated...portfolio of clients. Ensure full compliance with UK tax legislation across all relevant tax areas. Mentor, support, and help develop junior team members. Contribute to the continued growth and development of the practice. About You: Qualified tax professional...SeniorPermanentHybrid workingRemote
- £76k - £99k per annumEstimated...steady stream of clients has given us the opportunity to begin developing our own original games. At the moment, we cannot offer the same... ...AAA studios. However, our team already includes many experienced Senior artists who are genuinely passionate about creating something greater...SeniorRemote jobFreelance
£70k - £90k per annum
...latest technologies like Kubernetes, Istio, Helm, and more all at an unparalleled scale. This is your chance to grow, innovate, and develop your expertise in a team that prioritises cutting-edge solutions. Here’s what sets them apart: an unlimited training budget for certifications...SeniorRemote jobPermanent- £68k - £90k per annumEstimated...other Hogan applications, specifically Hogan CIS. Experience in Hogan integration with Zafin (vendor) platform. Other Languages English: C2 Proficient Seniority Senior...SeniorRemote job
€60k per annum
...Sales Manager, Publisher Development– AdTech, #Italy An opportunity to join a thriving ‘Hyper Growth’ #AdTech company as Senior Sales Manager, Publisher Development. This is a crucial position to the current and future growth and success of the business, and we are looking...SeniorRemote jobPermanent£80k - £100k per annum
"I'm helping save the planet...", a pretty cool way to describe your day-to-day, right? If aiding in decreasing carbon footprint and tackling a major environment issue is something that resonates with you then let's have a discussion. This is your chance to become part ...SeniorRemote jobPermanentOn-siteWork from home£60k - £80k per annum
...itself. One of the originators and still remains one of the most commonly used today. I am offering an opportunity for the role of Senior Java developer to come and take charge of a team of 8 mostly populated by juniors. As the senior you’ll be there to provide clear technical...SeniorRemote jobPermanent£70k - £100k per annum
Love everything to do with Kubernetes? Want to become a Kubernetes SME? Well, this opportunity will be for you! You will be joining a tech entity who are looking to grow out their center of excellence platform engineering team, where you'll work on exciting greenfield projects...SeniorRemote jobPermanent- £66k - £85k per annumEstimated...Senior Legal Counsel Do you want to work for a leading global multi-sector brand name organisation? Client You will be working for a leading household globally recognised brand name business. Role You will undertake an extremely diverse and broad role, working principally...SeniorHybrid workingRemoteWork from home
£70k - £80k per annum
...number of tools but also know when to use them. This role as a Senior SDET would see you working in a team of test engineers, evangelizing... ...testing. Drawing on your strong ability to read, debug, and develop in Java, you can build out automation frameworks from scratch in...SeniorRemote jobPermanentOn-site- £64k - £85k per annumEstimatedComplexio's Foundational AI works to automate business activities by ingesting whole company data – both structured and unstructured – and making sense of it. Using proprietary models and algorithms Complexio forms a deep understanding of how humans are interacting and using...SeniorRemote job
Do you want to receive more vacancies?
Subscribe and receive similar vacancies to Senior Blockchain Developer. Be the first to apply!
