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10 Contract API jobs in Harmondsworth + 20 miles
102 exact matches jobs are outside your preferred location
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Day Rate: Circa £500 per day (Outside IR35) Location: Hybrid/London - Contract: Initial 3 month contract - About the Role - A major UK public sector organisation is seeking an experienced Technical Business Analyst to support a high-profile digital transformation programme delivering fixed outcomes to challenging timelines. This role is ideal for a detail-driven analyst with strong technical capability, excellent stakeholder management, and a passion for data-led problem-solving. Key Responsibilities * Gather, validate, and document detailed business and technical requirements * Translate business objectives into technical specifications aligned with fixed deliverables and fixed outcomes * Conduct in-depth analysis of existing systems, data flows, integrations, and processes * Work closely with engineering, product, architecture, and delivery teams to shape solution o
Day Rate: Circa £500 per day (Outside IR35) Location: Hybrid/London - Contract: Initial 3 month contract - About the Role - A major UK public sector organisation is seeking an experienced Technical Business Analyst to support a high-profile digital transformation programme delivering fixed outcomes to challenging timelines. This role is ideal for a detail-driven analyst with strong technical capability, excellent stakeholder management, and a passion for data-led problem-solving. Key Responsibilities * Gather, validate, and document detailed business and technical requirements * Translate business objectives into technical specifications aligned with fixed deliverables and fixed outcomes * Conduct in-depth analysis of existing systems, data flows, integrations, and processes * Work closely with engineering, product, architecture, and delivery teams to shape solution o
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6 Month Contract - Reading (Hybrid) £500-525/day (Outside IR35) Start ideally in Dec 2025 / Jan 2026. A chance to work with a global IT Consultancy on a ServiceNow design + integration project for an external client. Hybrid Working - 2 days/week working remotely (WFH) + 3 days/week working from the office in Reading. Paying up to £525/day (Outside IR35). * In-depth hands-on ServiceNow Architecture expertise including design, configuration + implementation. * Deep ServiceNow modules + workflows experience including: ITSM, ITOM, Discovery, ITAM, CSM, HRSD, SecOps, GRC). * Managing integrations between ServiceNow and other systems (via REST, SOAP APIs, IntegrationHub, MID Server, custom integrations), ensuring reliability, security, latency, error handling, monitoring. * Defining + implementing technical governance, architecture operating models, and instance strategy.
6 Month Contract - Reading (Hybrid) £500-525/day (Outside IR35) Start ideally in Dec 2025 / Jan 2026. A chance to work with a global IT Consultancy on a ServiceNow design + integration project for an external client. Hybrid Working - 2 days/week working remotely (WFH) + 3 days/week working from the office in Reading. Paying up to £525/day (Outside IR35). * In-depth hands-on ServiceNow Architecture expertise including design, configuration + implementation. * Deep ServiceNow modules + workflows experience including: ITSM, ITOM, Discovery, ITAM, CSM, HRSD, SecOps, GRC). * Managing integrations between ServiceNow and other systems (via REST, SOAP APIs, IntegrationHub, MID Server, custom integrations), ensuring reliability, security, latency, error handling, monitoring. * Defining + implementing technical governance, architecture operating models, and instance strategy.
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Skilled in API development and microservices architecture
Skilled in API development and microservices architecture
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Deep knowledge of REST API design, scalability, fault tolerance, and performance optimization.
Deep knowledge of REST API design, scalability, fault tolerance, and performance optimization.
Define and document integration standards, including API strategies, event schemas, and interface contracts to enable decoupled, reusable services * Strong proficiency in API design (REST/GraphQL), microservices architecture, and middleware solution
Define and document integration standards, including API strategies, event schemas, and interface contracts to enable decoupled, reusable services * Strong proficiency in API design (REST/GraphQL), microservices architecture, and middleware solution
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Background in developing with C#, .NET, Web Services, Web Forms, MVC, JavaScript, jQuery, CSS, HTML, React, Web APIs and Visual Studio, API integrations
Background in developing with C#, .NET, Web Services, Web Forms, MVC, JavaScript, jQuery, CSS, HTML, React, Web APIs and Visual Studio, API integrations
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Experience with cloud integration services such as Azure API Management, Service Bus, Event Grid, and Functions.
Experience with cloud integration services such as Azure API Management, Service Bus, Event Grid, and Functions.
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Optimise page load speed, rendering performance, and API response times. * Familiarity with RESTful API design and backend performance considerations.
Optimise page load speed, rendering performance, and API response times. * Familiarity with RESTful API design and backend performance considerations.
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Experience with cloud-based data storage solutions and building efficient API routes in Node.js.
Experience with cloud-based data storage solutions and building efficient API routes in Node.js.
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Familiarity with the WebGL API and rendering pipelines is a plus. * Strong knowledge of the HTML5 Canvas API.
Familiarity with the WebGL API and rendering pipelines is a plus. * Strong knowledge of the HTML5 Canvas API.
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Familiarity with the WebGL API and rendering pipelines is a plus. * Strong knowledge of the HTML5 Canvas API.
Familiarity with the WebGL API and rendering pipelines is a plus. * Strong knowledge of the HTML5 Canvas API.
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You will be able to understand and reason about a complex distributed system with a comprehensive data processing API, the ability to process a wide range of complex input data types, and the capability to query that data with a SQL-like query engine.
You will be able to understand and reason about a complex distributed system with a comprehensive data processing API, the ability to process a wide range of complex input data types, and the capability to query that data with a SQL-like query engine.
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Strong understanding of API design
Strong understanding of API design
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Strong analytical thinking, communication skills, and experience with API-driven or extensible products are essential. * 5+ years as a Product Owner, Technical Product Manager, or similar role in SaaS, platform, API/SDK, or developer-focused products. * Deep knowledge of API-driven development and integration models. * Understanding of versioning, CI/CD pipelines, and open-API ecosystems.
Strong analytical thinking, communication skills, and experience with API-driven or extensible products are essential. * 5+ years as a Product Owner, Technical Product Manager, or similar role in SaaS, platform, API/SDK, or developer-focused products. * Deep knowledge of API-driven development and integration models. * Understanding of versioning, CI/CD pipelines, and open-API ecosystems.
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Implementation of Salesforce Flows to a high standard (e.g. screen flows, triggered flows, API flows)
Implementation of Salesforce Flows to a high standard (e.g. screen flows, triggered flows, API flows)
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Delivering security automation (scripting, API integration and via the Power Platform) * Experience of using and configuring API integrations
Delivering security automation (scripting, API integration and via the Power Platform) * Experience of using and configuring API integrations
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The ideal candidate has prior experience solving complex forms of scaled abuse, building sophisticated protections across multiple parts of OpenAIs product suite (ChatGPT, API, Sora).
The ideal candidate has prior experience solving complex forms of scaled abuse, building sophisticated protections across multiple parts of OpenAIs product suite (ChatGPT, API, Sora).
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Help drive decisions on API design, synchronous vs. asynchronous processing, consistency models, and service boundaries for the broader platform. * AWS Cloud Expertise: Deep architectural knowledge of the AWS ecosystem, such as Lambda, API Gateway, S3, DynamoDB, IAM, and container orchestration (EKS/ECS).
Help drive decisions on API design, synchronous vs. asynchronous processing, consistency models, and service boundaries for the broader platform. * AWS Cloud Expertise: Deep architectural knowledge of the AWS ecosystem, such as Lambda, API Gateway, S3, DynamoDB, IAM, and container orchestration (EKS/ECS).
This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI and new ways of working.
This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI and new ways of working.
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Must have experience with .NET and C#, SDLC (Software Development Life Cycle), Database (SQL, Azure Data Store) and API/REST
Must have experience with .NET and C#, SDLC (Software Development Life Cycle), Database (SQL, Azure Data Store) and API/REST
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Senior Machine Learning Operations Engineer
Senior Machine Learning Operations Engineer
FIRST CENTRAL SERVICES (UK) LIMITED
Haywards Heath, West Sussex
£65,000 - £75,000 a year
Understanding of microservices architecture, RESTful API design, development, and integration
Understanding of microservices architecture, RESTful API design, development, and integration
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You understand the patterns (e.g., webhooks, polling, message queues, event-driven architectures), the challenges of API versioning, and the principles of building a scalable, multi-tenant integrations platform. * Systems Thinking: Strong understanding of modern backend building blocks: API best practices; message queues (RabbitMQ, SNS/SQS or similar); relational data stores (PostgreSQL or similar); and cloud services (AWS or similar).
You understand the patterns (e.g., webhooks, polling, message queues, event-driven architectures), the challenges of API versioning, and the principles of building a scalable, multi-tenant integrations platform. * Systems Thinking: Strong understanding of modern backend building blocks: API best practices; message queues (RabbitMQ, SNS/SQS or similar); relational data stores (PostgreSQL or similar); and cloud services (AWS or similar).
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This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI to pioneer of AI-first development practices. * Design and implement scalable microservices with API-first mindset API-First & Microservices Excellence * Create comprehensive API documentation and developer guides API-First & Microservices Architecture * Deep knowledge of API design principles and RESTful/GraphQL patterns * Understanding of service mesh, API gateways, and inter-service communication * API design and documentation tools (Swagger/OpenAPI, Postman)
This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI to pioneer of AI-first development practices. * Design and implement scalable microservices with API-first mindset API-First & Microservices Excellence * Create comprehensive API documentation and developer guides API-First & Microservices Architecture * Deep knowledge of API design principles and RESTful/GraphQL patterns * Understanding of service mesh, API gateways, and inter-service communication * API design and documentation tools (Swagger/OpenAPI, Postman)
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The Developer Platform team supports 75B+ API calls and a growing marketplace with 300+ partner applications.
The Developer Platform team supports 75B+ API calls and a growing marketplace with 300+ partner applications.
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Work closely with IT teams to support data integration initiatives, with our customers & brokers to leverage our API capabilities to streamline processes and enable seamless data exchange across platforms.
Work closely with IT teams to support data integration initiatives, with our customers & brokers to leverage our API capabilities to streamline processes and enable seamless data exchange across platforms.
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