Smart Contract Developer

# Smart Contract DeveloperLondonApply for this job Permanent Experienced Professionals Products & Systems Engineering ID 479134-en\_GB Job Role: Senior DLT / Smart Contract Engineering Lead (Capital Markets & Banking) Role Summary: Lead the design and delivery of enterprise-grade blockchain solutions within regulated financial environments. This role focuses on smart contract engineering, tokenized securities, digital cash integration, and secure, compliant DLT platforms for capital markets, payments, and settlement systems. Hybrid working: The places that you work from day to day will vary according to your role, your needs, and those of the business; it will be a blend of Company offices, client sites, and your home; noting that you will be unable to work at home 100% of the time Job Role: Blockchain & Solution Delivery Design and implement distributed ledger solutions for:+ Capital markets+ Payments+ Custody and settlement systems Deliver production-grade blockchain systems for:+ Banks+ Financial Market Infrastructures (FMIs)+ Exchanges and regulated fintechs Integrate on-chain logic with off-chain enterprise systems:+ Core banking platforms+ Central Securities Depositories (CSDs)+ Payment rails+ Regulatory reporting systems Smart Contract Engineering Develop, test, audit, and deploy secure Solidity-based smart contracts Implement advanced contract logic for:+ Asset issuance, transfer, and redemption+ Lifecycle event management+ Settlement workflows (DvP, escrow, atomic swaps) Design and implement:+ Token standards (fungible, NFT, hybrid securities)+ Gas-optimized smart contract architectures+ Upgradeable contract patterns Tokenisation & Digital Cash Build and manage tokenisation frameworks for:+ Securities and financial instruments+ Tokenized assets across lifecycle stages Work with digital cash instruments:+ Stablecoins+ Tokenized bank deposits+ On-chain cash leg representations for DvP Ensure compliance with regulatory requirements for on-chain financial products Blockchain Platforms & Standards Work across both public and permissioned DLT platforms:+ Ethereum+ Hyperledger Besu+ Corda Apply enterprise blockchain standards for:+ Privacy+ Interoperability+ Tokenized securities markets Security, Custody & Cryptography Ensure secure smart contract design by addressing:+ Reentrancy attacks+ Access control vulnerabilities+ Precision/overflow issues Design custody and wallet solutions using:+ MPC (Multi-Party Computation)+ HSM-backed signing+ Policy-based wallet controls Implement privacy-preserving mechanisms:+ Permissioned access models+ Selective disclosure+ Zero-knowledge proof (ZKP) concepts Cloud, DevOps & Engineering Excellence Build and deploy cloud-native applications on:+ AWS, Azure, or GCP Operate containerized systems using:+ Kubernetes+ Microservices architectures Implement DevSecOps practices:+ CI/CD pipelines for smart contracts and backend services+ Automated testing and security scanning+ Infrastructure as Code (IaC) Ensure production reliability through:+ Monitoring (Prometheus, Grafana)+ Observability frameworks+ Secure secrets and key management Job Skills Experience 12+ years of software engineering experience 4-6+ years of hands-on smart contract development Proven experience in regulated environments (banks, FMIs, exchanges, fintechs) Strong exposure to capital markets and post-trade systems Core Technical Skills Solidity smart contract development (advanced level) Ethereum, Hyperledger Besu, Corda Token standards (ERC-20, ERC-721, ERC-1155, hybrid models) Smart contract lifecycle management Financial Domain Knowledge Securities lifecycle management Clearing and settlement processes Corporate actions and custody Delivery vs Payment (DvP) mechanisms Security & Cryptography Smart contract security best practices MPC, HSM, and wallet architecture Zero-knowledge proofs (ZKP) Selective disclosure and privacy-preserving architectures Cloud & DevOps AWS / Azure / GCP Kubernetes and containerization CI/CD pipelines Infrastructure as Code Monitoring tools (Prometheus, Grafana) System Integration Core banking integration Payment systems and rails Regulatory reporting platforms Hybrid on-chain/off-chain architectures. We are a Disability Confident Employer: Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government's Disability Confident scheme.As part of our commitment to inclusive recruitment, we will offer an interview to all candidates who: Declare they have a disability, and Meet the minimum essential criteria for the role. Please opt in during the application process. Make It Real (what does it mean for you): You'd be joining an accredited Great Place to work for Wellbeing in 2024. Employee wellbeing is vitally important to us as an organisation. We see a healthy and happy workforce a critical component for us to achieve our organisational ambitions. To help support wellbeing we have trained 'Mental Health Champions' across each of our business areas, and we have invested in wellbeing apps such as Thrive and Peppy. You will be empowered to explore, innovate, and progress. You will benefit from Capgemini's 'learning for life' mindset, meaning you will have countless training and development opportunities from thinktanks to hackathons, and access to 250,000 courses with numerous external certifications from AWS, Microsoft, Harvard ManageMentor, Cybersecurity qualifications and much more. You will be joining one of the World's Most Ethical Companies, as recognised by Ethisphere for 13 consecutive years. We live our values by making ethical business choices every day. Working ethically is at the centre of our culture at Capgemini, meaning you will be helping to create a future we can all be proud of. Why you should consider Capgemini: Growing clients' businesses while building a more sustainable, more inclusive future is a tough ask. When you join Capgemini, you'll join a thriving company and become part of a collective of free-thinkers, entrepreneurs and industry experts. We find new ways technology can help us reimagine what's possible. It's why, together, we seek out opportunities that will transform the world's leading businesses, and it's how you'll gain the experiences and connections you need to shape your future. By learning from each other every day, sharing knowledge, and always pushing yourself to do better, you'll build the skills you want. You'll use your skills to help our clients leverage technology to innovate and grow their business. So, it might not always be easy, but making the world a better place rarely is. About Capgemini: Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organisations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2024 global revenues of €22.1 billion. Make it real