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70 Permanent API jobs in The City, City of London + 20 miles
295 exact matches jobs are outside your preferred location
Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 350,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fuelled by its market leading capabilities in AI, cloud and data, combined with its deep industry expertise and partner ecosystem. The Group reported 2024 global revenues of €22.1 billion. At Capgemini Invent, we believe difference drives change.
Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 350,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fuelled by its market leading capabilities in AI, cloud and data, combined with its deep industry expertise and partner ecosystem. The Group reported 2024 global revenues of €22.1 billion. At Capgemini Invent, we believe difference drives change.
At Barings, we are as invested in our associates as we are in our clients. We recognize those who work diligently for us and reward them for personal and professional integrity, communication skills, distinct competencies and expertise in specific strategies, ability to collaborate as a team member and true dedication to the interests of our clients. We thank you for your interest in joining the Barings team, and invite you to explore our current employment opportunities. Job Title Title: Cyber Operations - Threat Intelligence Specialist Department: Information Security Location: London, UK Barings is a leading global financial services firm dedicated to meeting the evolving investment and capital needs of our clients and customers. Through active asset management and direct origination, we provide innovative solutions and access to differentiated opportunities across
At Barings, we are as invested in our associates as we are in our clients. We recognize those who work diligently for us and reward them for personal and professional integrity, communication skills, distinct competencies and expertise in specific strategies, ability to collaborate as a team member and true dedication to the interests of our clients. We thank you for your interest in joining the Barings team, and invite you to explore our current employment opportunities. Job Title Title: Cyber Operations - Threat Intelligence Specialist Department: Information Security Location: London, UK Barings is a leading global financial services firm dedicated to meeting the evolving investment and capital needs of our clients and customers. Through active asset management and direct origination, we provide innovative solutions and access to differentiated opportunities across
Be Part of Something Real - A close-knit team with big ideas. A passion for solving complex data challenges. A leading technology company specialising in data intelligence, AI and geospatial solutions. At Envitia, we are building something special. Were thrilled to announce that Envitia has been named one of the Sunday Times Top 100 Medium-Sized Companies to Work For in 2025 a prestigious recognition that highlights our commitment to creating an outstanding workplace where innovation, collaboration, and personal growth thrive. By using the power of data to tackle real-world challenges, our teams empower organisations to make smarter, data-driven decisions. Were small enough that your ideas get heard, your impact gets noticed and your growth actually matters to us. You wont get lost in the crowd; youll shape where we go next.
Be Part of Something Real - A close-knit team with big ideas. A passion for solving complex data challenges. A leading technology company specialising in data intelligence, AI and geospatial solutions. At Envitia, we are building something special. Were thrilled to announce that Envitia has been named one of the Sunday Times Top 100 Medium-Sized Companies to Work For in 2025 a prestigious recognition that highlights our commitment to creating an outstanding workplace where innovation, collaboration, and personal growth thrive. By using the power of data to tackle real-world challenges, our teams empower organisations to make smarter, data-driven decisions. Were small enough that your ideas get heard, your impact gets noticed and your growth actually matters to us. You wont get lost in the crowd; youll shape where we go next.
About the Hiring Team - Tencent Overseas IT has the mission to empower Tencents rapid global growth with future ready, global IT platforms, applications and services. We are chartered to lead the Overseas IT strategy, architecture, roadmap and execution. Satisfying our internal/external customers and becoming a world class global IT team are our top aspirations. What the Role Entails * Designing and developing websites and applications for both PC and mobile platforms. * Implementing user interface and user experience design. * Adhering to web standards and best practices to ensure accessibility, usability, and performance of websites and applications. * Collaborating with back-end developers to ensure correct data exchange between the front-end and back-end. * Ensuring cross-browser and cross-device compatibility of websites and applications.
About the Hiring Team - Tencent Overseas IT has the mission to empower Tencents rapid global growth with future ready, global IT platforms, applications and services. We are chartered to lead the Overseas IT strategy, architecture, roadmap and execution. Satisfying our internal/external customers and becoming a world class global IT team are our top aspirations. What the Role Entails * Designing and developing websites and applications for both PC and mobile platforms. * Implementing user interface and user experience design. * Adhering to web standards and best practices to ensure accessibility, usability, and performance of websites and applications. * Collaborating with back-end developers to ensure correct data exchange between the front-end and back-end. * Ensuring cross-browser and cross-device compatibility of websites and applications.
Strong technical expertise in API design (REST, SOAP), data mapping, middleware platforms, and ETL processes.
Strong technical expertise in API design (REST, SOAP), data mapping, middleware platforms, and ETL processes.
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Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
Architect and develop scalable and performant mission critical web applications using Next.js for front-end and Node.js for API development.
Architect and develop scalable and performant mission critical web applications using Next.js for front-end and Node.js for API development.
Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Experience in Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus
Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Experience in Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus
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Understanding and/or experience in managing API-based software businesses
Understanding and/or experience in managing API-based software businesses
Familiarity with API testing and integration diagnostics
Familiarity with API testing and integration diagnostics
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Familiarity with API testing and integration diagnostics
Familiarity with API testing and integration diagnostics
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Broad Testing Experience: Experience in front-end and API testing.
Broad Testing Experience: Experience in front-end and API testing.
Strong API development and database experience (Postgres/Oracle + SQL).
Strong API development and database experience (Postgres/Oracle + SQL).
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The OpenPayd platform delivers a suite of banking and payments infrastructure: accounts in over 40 currencies, FX, on/off ramp, international and domestic payments, Open Banking services all via a single API.
The OpenPayd platform delivers a suite of banking and payments infrastructure: accounts in over 40 currencies, FX, on/off ramp, international and domestic payments, Open Banking services all via a single API.
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
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Experience in consuming a RESTful API.
Experience in consuming a RESTful API.
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.
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Provides advanced knowledge of API development, API management, and implementation strategies to enhance scalability and system efficiency.
Provides advanced knowledge of API development, API management, and implementation strategies to enhance scalability and system efficiency.
Designed robust data architectures with a strong grasp of distributed systems, API development, and the patterns that make complex data processing reliable and maintainable.
Designed robust data architectures with a strong grasp of distributed systems, API development, and the patterns that make complex data processing reliable and maintainable.
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Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
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Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
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You'll work across modern architectures, leveraging containerisation, event-driven design, and API-first principles to solve complex integration challenges. * Design and manage secure REST/GraphQL APIs via API Gateway, including authentication, throttling, and schema validation. * Apply best practices in Kubernetes and API security, including TLS, KMS, RBAC, and service-to-service authentication. * Strong API design and security expertise (OpenAPI, OAuth2, JWT).
You'll work across modern architectures, leveraging containerisation, event-driven design, and API-first principles to solve complex integration challenges. * Design and manage secure REST/GraphQL APIs via API Gateway, including authentication, throttling, and schema validation. * Apply best practices in Kubernetes and API security, including TLS, KMS, RBAC, and service-to-service authentication. * Strong API design and security expertise (OpenAPI, OAuth2, JWT).
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Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
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To complement the efficient networking architecture, you will help designing Infrastructure-as-a-Service virtual network orchestration API-driven services to support tenants workloads security and performance SLAs for BMaaS, VMaaS and Kubernetes. * Hands-on experience developing secure and performant API-driven services (gRPC, ReST with transport encryption and strong authentication)
To complement the efficient networking architecture, you will help designing Infrastructure-as-a-Service virtual network orchestration API-driven services to support tenants workloads security and performance SLAs for BMaaS, VMaaS and Kubernetes. * Hands-on experience developing secure and performant API-driven services (gRPC, ReST with transport encryption and strong authentication)
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Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
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