About the role: As a Senior Smart Contract Developer / Blockchain Engineer with expertise in enterprise blockchain platforms, you will collaborate with our client's blockchain and cloud infrastructure teams, architects, product owners, and external partners in multi-organisation blockchain networks. You will be responsible for designing, developing, testing, and deploying smart contracts and blockchain solutions for enterprise environments. J ob Details: Location: London Duration: 04/12/2026 Days on site: 2 Roles and Responsibilities: Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, GoQuorum, Hyperledger Besu, Corda). Implement asset tokenization, on-chain/off-chain data models, and blockchain transaction workflows. Develop and integrate RESTful APIs and microservices (Node.js / Java) to interact with smart contracts. Ensure security, performance, and scalability of smart contracts and blockchain applications. Collaborate with architects, product owners, and external partners in multi-organization blockchain networks. Lead or mentor development teams, enforcing coding standards, testing, and best practices. Work closely with cloud infrastructure teams to deploy blockchain solutions using Azure/AWS services. Support POCs, innovation initiatives, and exploration of Layer 2 scaling solutions. Participate in design reviews, audits, and governance processes related to blockchain systems. Other stuff we're potentially looking for: 8+ years of experience in software engineering with strong blockchain focus. Hands-on experience with Solidity smart contract development. Strong understanding of Ethereum-compatible platforms (GoQuorum, Hyperledger Besu). Experience with enterprise blockchain frameworks such as R3 Corda and Ripple. Proficiency in Node.js, TypeScript, and/or Java (Spring Boot). Strong knowledge of microservices architecture and asynchronous processing patterns. Experience designing on-chain vs off-chain data models. Familiarity with REST APIs, event-driven systems, and message queues. Solid understanding of blockchain security concepts (permissions, key management, transaction integrity). What's in it for you? Our client loves to reward their people for doing a great job. This is a contract role until 2/2026. A daily rate, in-scope IR35, of £535 (via a Hays Approved Umbrella Company). This role provides a hybrid working access in London (2 days onsite). Next Steps: Once you've applied, one of our friendly recruitment consultants will give you a call and talk you through the screening process.If your application is successful, you'll be involved in a live virtual interview with one of our client's hiring managers to get to know you better. We look forward to speaking to you! Hays Talent Solutions is a trading division of Hays Specialist Recruitment Limited and acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk
May 20, 2026
Contractor
About the role: As a Senior Smart Contract Developer / Blockchain Engineer with expertise in enterprise blockchain platforms, you will collaborate with our client's blockchain and cloud infrastructure teams, architects, product owners, and external partners in multi-organisation blockchain networks. You will be responsible for designing, developing, testing, and deploying smart contracts and blockchain solutions for enterprise environments. J ob Details: Location: London Duration: 04/12/2026 Days on site: 2 Roles and Responsibilities: Design, develop, test, and deploy smart contracts for enterprise blockchain platforms (Ethereum, GoQuorum, Hyperledger Besu, Corda). Implement asset tokenization, on-chain/off-chain data models, and blockchain transaction workflows. Develop and integrate RESTful APIs and microservices (Node.js / Java) to interact with smart contracts. Ensure security, performance, and scalability of smart contracts and blockchain applications. Collaborate with architects, product owners, and external partners in multi-organization blockchain networks. Lead or mentor development teams, enforcing coding standards, testing, and best practices. Work closely with cloud infrastructure teams to deploy blockchain solutions using Azure/AWS services. Support POCs, innovation initiatives, and exploration of Layer 2 scaling solutions. Participate in design reviews, audits, and governance processes related to blockchain systems. Other stuff we're potentially looking for: 8+ years of experience in software engineering with strong blockchain focus. Hands-on experience with Solidity smart contract development. Strong understanding of Ethereum-compatible platforms (GoQuorum, Hyperledger Besu). Experience with enterprise blockchain frameworks such as R3 Corda and Ripple. Proficiency in Node.js, TypeScript, and/or Java (Spring Boot). Strong knowledge of microservices architecture and asynchronous processing patterns. Experience designing on-chain vs off-chain data models. Familiarity with REST APIs, event-driven systems, and message queues. Solid understanding of blockchain security concepts (permissions, key management, transaction integrity). What's in it for you? Our client loves to reward their people for doing a great job. This is a contract role until 2/2026. A daily rate, in-scope IR35, of £535 (via a Hays Approved Umbrella Company). This role provides a hybrid working access in London (2 days onsite). Next Steps: Once you've applied, one of our friendly recruitment consultants will give you a call and talk you through the screening process.If your application is successful, you'll be involved in a live virtual interview with one of our client's hiring managers to get to know you better. We look forward to speaking to you! Hays Talent Solutions is a trading division of Hays Specialist Recruitment Limited and acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk
Our client, a leading technology-driven Financial Services company, is seeking a talented DevOps Engineer to join their team. Specialising in fixed income securities, they have built a reputation for innovation, performance, and a highly collaborative culture. This is an exciting opportunity to play a key role in designing, customising, and deploying scalable DevOps solutions across a sophisticated infrastructure landscape. The Role You will be instrumental in building and enhancing DevOps capabilities, working across data platforms, orchestration frameworks, infrastructure automation, and cybersecurity. The position suits someone with a strong engineering mindset who thrives in high-performance environments and is passionate about scalability, resilience, and secure systems design. Key Responsibilities Develop and customise DevOps tools, leveraging open-source technologies and programming languages such as Java, Python, and/or Go Manage, optimise, and secure diverse data stores, including object storage, inverted index systems, and relational databases Deploy and maintain distributed querying engines across multiple data platforms Design and extend orchestration frameworks, including DAG-based workflows and containerised environments Configure and manage dynamic container systems across OS and application layers Implement Infrastructure as Code (IaC) to map and manage physical and virtual resources Enforce robust data governance practices, including encryption and data classification strategies Build and maintain reliable backup and archival solutions across on-premise and cloud environments Establish and manage configuration and asset management systems Key Requirements Strong software engineering background with experience in DevOps tooling and automation Proficiency in at least one of the following: Python, Java, or Go Hands-on experience with infrastructure as code and modern DevOps ecosystems Solid understanding of distributed systems, data platforms, and orchestration tools Strong focus on security, scalability, and system reliability Experience working with containerisation and cloud/on-prem hybrid environments Why Apply? Join a high-performing, technology-first trading firm Work in a collaborative, supportive environment where people genuinely enjoy working together Gain exposure to complex, large-scale infrastructure and cutting-edge technologies Competitive compensation and strong career progression opportunities Due to the volume of applications, we can only respond to those that match these requirements.
May 19, 2026
Full time
Our client, a leading technology-driven Financial Services company, is seeking a talented DevOps Engineer to join their team. Specialising in fixed income securities, they have built a reputation for innovation, performance, and a highly collaborative culture. This is an exciting opportunity to play a key role in designing, customising, and deploying scalable DevOps solutions across a sophisticated infrastructure landscape. The Role You will be instrumental in building and enhancing DevOps capabilities, working across data platforms, orchestration frameworks, infrastructure automation, and cybersecurity. The position suits someone with a strong engineering mindset who thrives in high-performance environments and is passionate about scalability, resilience, and secure systems design. Key Responsibilities Develop and customise DevOps tools, leveraging open-source technologies and programming languages such as Java, Python, and/or Go Manage, optimise, and secure diverse data stores, including object storage, inverted index systems, and relational databases Deploy and maintain distributed querying engines across multiple data platforms Design and extend orchestration frameworks, including DAG-based workflows and containerised environments Configure and manage dynamic container systems across OS and application layers Implement Infrastructure as Code (IaC) to map and manage physical and virtual resources Enforce robust data governance practices, including encryption and data classification strategies Build and maintain reliable backup and archival solutions across on-premise and cloud environments Establish and manage configuration and asset management systems Key Requirements Strong software engineering background with experience in DevOps tooling and automation Proficiency in at least one of the following: Python, Java, or Go Hands-on experience with infrastructure as code and modern DevOps ecosystems Solid understanding of distributed systems, data platforms, and orchestration tools Strong focus on security, scalability, and system reliability Experience working with containerisation and cloud/on-prem hybrid environments Why Apply? Join a high-performing, technology-first trading firm Work in a collaborative, supportive environment where people genuinely enjoy working together Gain exposure to complex, large-scale infrastructure and cutting-edge technologies Competitive compensation and strong career progression opportunities Due to the volume of applications, we can only respond to those that match these requirements.
Senior Software Engineer / Developer (Data) London / WFH to £115k Global-leading FinTech is seeking a Senior Software Engineer to take ownership of a new team responsible for data focussed strategic enhancements on their core platform. The organisation is a pioneer in the field of cross-asset securities and derivatives post-trade processing technology and have created ground-breaking, adaptable software that produces secure and scalable solutions for peak operational efficiency and optimum business performance for their clients. This is a great opportunity to accelerate your career alongside established business and technology leaders and deepen your finance experience. As a Senior Software Engineer, you'll work on strategic initiatives to develop integration and data migration strategies and tools to allow highly automated migration or integration between the PTP (Post Trade Processing) platform and legacy internal and external systems. You'll be working on Greenfield systems, using a range of technology, you will be granted a great deal of autonomy across the full development lifecycle, influencing key technical decisions and will have the opportunity to grow the team and move into a leadership role if desired. Location / WFH: You'll join colleagues in the London office three days a week with flexibility to work from home the other two days. About you: You're a data centric, Senior Software Engineer with a strong knowledge of modern software engineering best practices You have strong development experience with C#, C++ or Python You have advanced SQL database knowledge (they use Oracle), experience with data transformation technologies such as Databricks or Snowflake and data streaming technologies such as Kafka You have a good understanding of financial markets and the trade lifecycle You're keen to take ownership and enjoy working proactively with minimal supervision You have excellent collaboration and stakeholder management skills You're degree educated in a STEM discipline What's in it for you: As a Senior Software Engineer / Developer (Data) you will receive a competitive package: Salary to £115k Pension (to 9% contribution) Healthcare Volunteer / charity days Hybrid working Career development and training Apply now to find out more about this Senior Software Engineer / Developer (Data) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.
Oct 02, 2025
Full time
Senior Software Engineer / Developer (Data) London / WFH to £115k Global-leading FinTech is seeking a Senior Software Engineer to take ownership of a new team responsible for data focussed strategic enhancements on their core platform. The organisation is a pioneer in the field of cross-asset securities and derivatives post-trade processing technology and have created ground-breaking, adaptable software that produces secure and scalable solutions for peak operational efficiency and optimum business performance for their clients. This is a great opportunity to accelerate your career alongside established business and technology leaders and deepen your finance experience. As a Senior Software Engineer, you'll work on strategic initiatives to develop integration and data migration strategies and tools to allow highly automated migration or integration between the PTP (Post Trade Processing) platform and legacy internal and external systems. You'll be working on Greenfield systems, using a range of technology, you will be granted a great deal of autonomy across the full development lifecycle, influencing key technical decisions and will have the opportunity to grow the team and move into a leadership role if desired. Location / WFH: You'll join colleagues in the London office three days a week with flexibility to work from home the other two days. About you: You're a data centric, Senior Software Engineer with a strong knowledge of modern software engineering best practices You have strong development experience with C#, C++ or Python You have advanced SQL database knowledge (they use Oracle), experience with data transformation technologies such as Databricks or Snowflake and data streaming technologies such as Kafka You have a good understanding of financial markets and the trade lifecycle You're keen to take ownership and enjoy working proactively with minimal supervision You have excellent collaboration and stakeholder management skills You're degree educated in a STEM discipline What's in it for you: As a Senior Software Engineer / Developer (Data) you will receive a competitive package: Salary to £115k Pension (to 9% contribution) Healthcare Volunteer / charity days Hybrid working Career development and training Apply now to find out more about this Senior Software Engineer / Developer (Data) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.
