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14 Contract API jobs in Croxley Green + 20 miles
66 exact matches jobs are outside your preferred location
Since being founded in 2018, Copper has been building the standard for institutional digital asset infrastructure with a focus on custody, collateral management, and prime services. Led by Amar Kuchinad, Copper's Global CEO, the firm provides a comprehensive suite of custody, trading and settlement solutions that reduce counterparty risk and bring greater capital and operational efficiency to digital asset markets. At the heart of Copper's offering is Multi-Party Computation (MPC) technology the gold standard in secure custody. Coppers multi-award winning custody system is unique in that it can be connected to centralised exchanges, DeFi applications and even staking pools without the assets leaving the custody. Built on top of this state-of-the-art custody, ClearLoop is the first solution in the market that overcomes a growing industry challenge; counterparty risk wi
Since being founded in 2018, Copper has been building the standard for institutional digital asset infrastructure with a focus on custody, collateral management, and prime services. Led by Amar Kuchinad, Copper's Global CEO, the firm provides a comprehensive suite of custody, trading and settlement solutions that reduce counterparty risk and bring greater capital and operational efficiency to digital asset markets. At the heart of Copper's offering is Multi-Party Computation (MPC) technology the gold standard in secure custody. Coppers multi-award winning custody system is unique in that it can be connected to centralised exchanges, DeFi applications and even staking pools without the assets leaving the custody. Built on top of this state-of-the-art custody, ClearLoop is the first solution in the market that overcomes a growing industry challenge; counterparty risk wi
Castleton Commodities International ( is a global leader in energy commodity trading and asset investment. Our Data Science & Technology team is central to our success, engineering the high-performance data, systems and innovative tools that power our commercial decision-making. We build platforms and forecasts that help our front-office teams understand market behavior, forecast price movements, and manage risk. Our team solves complex, high-impact challenges using a modern technology stack, including the latest in GenAI and the latest technologies. We develop everything in cloud-native infrastructure from structured data and real-time analytics to back testing engines, third party integrations, and internal libraries, all designed to give CCI a competitive edge in global commodities markets.
Castleton Commodities International ( is a global leader in energy commodity trading and asset investment. Our Data Science & Technology team is central to our success, engineering the high-performance data, systems and innovative tools that power our commercial decision-making. We build platforms and forecasts that help our front-office teams understand market behavior, forecast price movements, and manage risk. Our team solves complex, high-impact challenges using a modern technology stack, including the latest in GenAI and the latest technologies. We develop everything in cloud-native infrastructure from structured data and real-time analytics to back testing engines, third party integrations, and internal libraries, all designed to give CCI a competitive edge in global commodities markets.
Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive infor
Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive infor
About us - Were an early-stage company operating in stealth, and while were not publicly sharing full details just yet, we can assure you the work ahead is ambitious, meaningful and exciting. As you progress through the hiring process, well share more about our mission, our technology and the team youll be joining. For now, what matters most is finding people who are energised by the pace and possibility of an emerging company and who want to help shape something from the ground up. What We Offer * High-impact environment: Join a company shaping the future of software, working with a team thats redefining how AI meets real-world business needs * Ownership and visibility: In a small, high-performing team, the impact of your work isnt theoretical, it actively shapes the companys direction * Empowerment through innovation: Use cutting-edge AI tools internally.
About us - Were an early-stage company operating in stealth, and while were not publicly sharing full details just yet, we can assure you the work ahead is ambitious, meaningful and exciting. As you progress through the hiring process, well share more about our mission, our technology and the team youll be joining. For now, what matters most is finding people who are energised by the pace and possibility of an emerging company and who want to help shape something from the ground up. What We Offer * High-impact environment: Join a company shaping the future of software, working with a team thats redefining how AI meets real-world business needs * Ownership and visibility: In a small, high-performing team, the impact of your work isnt theoretical, it actively shapes the companys direction * Empowerment through innovation: Use cutting-edge AI tools internally.
Waracle are looking for a Senior Full Stack Developer for an exciting new role joining our world-class digital technology consultancy and home to a diverse, smart, curious and ambitious community of specialists in technology-driven transformation. We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business-critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations. This is a Hybrid role working from our Dundee, Glasgow, Edinburgh, or London offices. As a Senior Fullstack Developer at Waracle, you will be a pivotal technical leader, using your expertise across both frontend and backend technologies.
Waracle are looking for a Senior Full Stack Developer for an exciting new role joining our world-class digital technology consultancy and home to a diverse, smart, curious and ambitious community of specialists in technology-driven transformation. We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business-critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations. This is a Hybrid role working from our Dundee, Glasgow, Edinburgh, or London offices. As a Senior Fullstack Developer at Waracle, you will be a pivotal technical leader, using your expertise across both frontend and backend technologies.
RealVNC is the remote access platform for engineers looking for the most reliable and the most secure solution built by the creators of VNC technology. Over the last 25 years, as the inventors of VNC, we've enabled a global workforce to work wherever works and created the remote access market. Our software is used by hundreds of millions of users worldwide including IT professionals from global companies, such as Intel, IBM, NASA, Shell, DreamWorks and Philips. Our lead product, VNC Connect, allows users to connect securely to a remote device anywhere in the world, see its screen in real-time, and take control as though sitting in front of it. The product has been deployed across a myriad of use cases, from remote support through to deploying the software onto connected devices such as medical ventilators, set-top boxes, heavy industrial machinery and more.
RealVNC is the remote access platform for engineers looking for the most reliable and the most secure solution built by the creators of VNC technology. Over the last 25 years, as the inventors of VNC, we've enabled a global workforce to work wherever works and created the remote access market. Our software is used by hundreds of millions of users worldwide including IT professionals from global companies, such as Intel, IBM, NASA, Shell, DreamWorks and Philips. Our lead product, VNC Connect, allows users to connect securely to a remote device anywhere in the world, see its screen in real-time, and take control as though sitting in front of it. The product has been deployed across a myriad of use cases, from remote support through to deploying the software onto connected devices such as medical ventilators, set-top boxes, heavy industrial machinery and more.
About the Opportunity - We are looking for an experienced Partner Marketing Manager to help disrupt the DXP category as we enter an ambitious new phase of growth. Contentful is a composable digital experience platform designed for structured content, personalization at scale, powerful AI orchestration and management capabilities, along with the best in class APIs, allowing digital teams and developers to ship personalized, content-driven experiences faster, to any type of digital endpoint. Companies, including Spotify, Sephora, Harley Davidson, Kraft Heinz, Red Bull, WeWork, Lyft, Peloton, and Urban Outfitters, rely on Contentful to manage digital experiences as part of their modern web stack. Reporting to the Global Head of Partner Marketing, you will be responsible for driving growth through our global partner ecosystem, with a focus on Americas and EMEA System ...
About the Opportunity - We are looking for an experienced Partner Marketing Manager to help disrupt the DXP category as we enter an ambitious new phase of growth. Contentful is a composable digital experience platform designed for structured content, personalization at scale, powerful AI orchestration and management capabilities, along with the best in class APIs, allowing digital teams and developers to ship personalized, content-driven experiences faster, to any type of digital endpoint. Companies, including Spotify, Sephora, Harley Davidson, Kraft Heinz, Red Bull, WeWork, Lyft, Peloton, and Urban Outfitters, rely on Contentful to manage digital experiences as part of their modern web stack. Reporting to the Global Head of Partner Marketing, you will be responsible for driving growth through our global partner ecosystem, with a focus on Americas and EMEA System ...
We are a global healthcare communications agency with deep therapeutic expertise that traverses the asset lifecycle, delivering transformative outcomes for healthcare brands for over 20 years. Our more than 500 highly trained professionals work with speed and agility to craft and execute breakthrough strategies that maximise performance and unlock a brand's full potential. Lucid Global works with global brand teams at big and mid-tier pharmaceuticals and biotech clients to deliver powerful medical communications solutions across the asset lifecycle. Lucid Consulting brings depth of expertise in the research, development and commercialisation of solutions across therapeutic areas and modalities by streamlining product development, building operational capabilities, innovating, and supporting execution to create value for patients, clients and shareholders.
We are a global healthcare communications agency with deep therapeutic expertise that traverses the asset lifecycle, delivering transformative outcomes for healthcare brands for over 20 years. Our more than 500 highly trained professionals work with speed and agility to craft and execute breakthrough strategies that maximise performance and unlock a brand's full potential. Lucid Global works with global brand teams at big and mid-tier pharmaceuticals and biotech clients to deliver powerful medical communications solutions across the asset lifecycle. Lucid Consulting brings depth of expertise in the research, development and commercialisation of solutions across therapeutic areas and modalities by streamlining product development, building operational capabilities, innovating, and supporting execution to create value for patients, clients and shareholders.
Experience with API design and implementing authentication/authorisation flows
Experience with API design and implementing authentication/authorisation flows
Web API Services
Web API Services
You understand how customer data moves through CRM systems, including events and API-driven attributes
You understand how customer data moves through CRM systems, including events and API-driven attributes
Experience with Iron Python and the API-Rest Framework.
Experience with Iron Python and the API-Rest Framework.
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
Manager, Lead Research Scientist, Training Data (Foundational Research)
Manager, Lead Research Scientist, Training Data (Foundational Research)
Thomson Reuters
London
Competitive
Post-training techniques for planning, reasoning & complex workflows (e.g., Reasoning Models, LLMs + Knowledge Graphs, Test time compute, CoT pipelines, Tool use & API calling, etc.)
Post-training techniques for planning, reasoning & complex workflows (e.g., Reasoning Models, LLMs + Knowledge Graphs, Test time compute, CoT pipelines, Tool use & API calling, etc.)
AI Engineer, Software Engineer, Machine Learning Engineer, LLM, GenAI, Agentic, LangChain, LangGraph, Langfuse, Python, Backend, API, MLflow, W&B, DVC, Evaluation, RAG, Retrieval, Semantic Search, Multimodal, Computer Vision, Speech-to-Text, Cloud, AWS, Azure, Model Deployment, UK Remote, Contractor, EdTech, Assessment Systems, Automated Scoring, Git, GitHub, UK Hours
AI Engineer, Software Engineer, Machine Learning Engineer, LLM, GenAI, Agentic, LangChain, LangGraph, Langfuse, Python, Backend, API, MLflow, W&B, DVC, Evaluation, RAG, Retrieval, Semantic Search, Multimodal, Computer Vision, Speech-to-Text, Cloud, AWS, Azure, Model Deployment, UK Remote, Contractor, EdTech, Assessment Systems, Automated Scoring, Git, GitHub, UK Hours
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Integrate automated API security testing workflows into the platform, ensuring reliability and accuracy of results.
Integrate automated API security testing workflows into the platform, ensuring reliability and accuracy of results.
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We are looking for a highly skilled Lead Business Analyst / Product Owner to lead the design, development, and delivery of API solutions that enable seamless integration across our digital ecosystem. This hybrid role combines strategic product ownership with hands-on business analysis to ensure our API platform meets business needs, enhances interoperability, and supports scalable growth. * Define and own the API product backlog, aligning with business objectives and technology strategy. * Act as the voice of the customer for API consumers, ensuring usability and developer experience. * Gather, analyze, and document functional and non-functional requirements for API development. * Collaborate with architects and engineering teams to design API specifications, JSON, XM
We are looking for a highly skilled Lead Business Analyst / Product Owner to lead the design, development, and delivery of API solutions that enable seamless integration across our digital ecosystem. This hybrid role combines strategic product ownership with hands-on business analysis to ensure our API platform meets business needs, enhances interoperability, and supports scalable growth. * Define and own the API product backlog, aligning with business objectives and technology strategy. * Act as the voice of the customer for API consumers, ensuring usability and developer experience. * Gather, analyze, and document functional and non-functional requirements for API development. * Collaborate with architects and engineering teams to design API specifications, JSON, XM
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Your role as a GCP APIGEE specialist involves supporting teams with modern DevOps solutions, curating scalable GCP Cloud Products as IaaC, and building APIGEE/API solutions while modernising the APIGEE gateway. * Hands-on development and management of Google Apigee API Management Platform * Design, build, and deploy API proxies, policies, and configurations in Apigee * Implement CI/CD pipelines for API lifecycle management using tools like Jenkins, GitHub Actions, or Harness * Develop and maintain API security policies (OAuth, JWT, mTLS, rate limiting, threat protection) * Build automated workflows and scripts for API operations using Python * Manage API analytics, monitoring, and logging for performance and compliance * Enforce GCP Organization Polic
Your role as a GCP APIGEE specialist involves supporting teams with modern DevOps solutions, curating scalable GCP Cloud Products as IaaC, and building APIGEE/API solutions while modernising the APIGEE gateway. * Hands-on development and management of Google Apigee API Management Platform * Design, build, and deploy API proxies, policies, and configurations in Apigee * Implement CI/CD pipelines for API lifecycle management using tools like Jenkins, GitHub Actions, or Harness * Develop and maintain API security policies (OAuth, JWT, mTLS, rate limiting, threat protection) * Build automated workflows and scripts for API operations using Python * Manage API analytics, monitoring, and logging for performance and compliance * Enforce GCP Organization Polic
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Strong background in system/API design.
Strong background in system/API design.
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Contract: Automation Architect - Start Date: ASAP - Duration: 6 months - Location: Remote - UK - Rate: circa £550 - £590 per day outside of IR35 - This role is for a highly skilled and experienced Automation Architect responsible for the end-to-end delivery of on-premise private cloud infrastructure automation solutions. The ideal person will bridge the gap between architectural design, process analysis, and hands-on implementation, ensuring that infrastructure is provisioned and managed efficiently via Infrastructure as Code (IaC) principles utilizing a robust CI/CD pipeline orchestrated by Git runner technology. This automation will specifically target the deployment and management of environments hosting Containers (e.g., Kubernetes, OpenShift) and traditional Virtual Machines (VMs). Responsibilities - Strategy and Analysis
Contract: Automation Architect - Start Date: ASAP - Duration: 6 months - Location: Remote - UK - Rate: circa £550 - £590 per day outside of IR35 - This role is for a highly skilled and experienced Automation Architect responsible for the end-to-end delivery of on-premise private cloud infrastructure automation solutions. The ideal person will bridge the gap between architectural design, process analysis, and hands-on implementation, ensuring that infrastructure is provisioned and managed efficiently via Infrastructure as Code (IaC) principles utilizing a robust CI/CD pipeline orchestrated by Git runner technology. This automation will specifically target the deployment and management of environments hosting Containers (e.g., Kubernetes, OpenShift) and traditional Virtual Machines (VMs). Responsibilities - Strategy and Analysis
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Familiarity with API testing, SQL queries, and data migration testing.
Familiarity with API testing, SQL queries, and data migration testing.
Deep expertise integrating with Nutanix Prism v4 API and advanced proficiency coding in C# is required. The ideal candidate will also have strong expertise integrating with VMware vCenter API. * Deep expertise of Nutanix Prism v4 API and Nutanix AHV operations. * Strong expertise with VMware vCenter API and VMware ESXi operations.
Deep expertise integrating with Nutanix Prism v4 API and advanced proficiency coding in C# is required. The ideal candidate will also have strong expertise integrating with VMware vCenter API. * Deep expertise of Nutanix Prism v4 API and Nutanix AHV operations. * Strong expertise with VMware vCenter API and VMware ESXi operations.
API Interaction: Familiarity with APIs, particularly in Python
API Interaction: Familiarity with APIs, particularly in Python
Understanding of DevOps practices , cloud infrastructure automation (Terraform, Ansible), and scalable API architectures.
Understanding of DevOps practices , cloud infrastructure automation (Terraform, Ansible), and scalable API architectures.
Troubleshoot API connections, reviewing payloads, authentication, and performance to maintain stability.
Troubleshoot API connections, reviewing payloads, authentication, and performance to maintain stability.