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4 Contract API jobs in Hemel Hempstead + 20 miles
Strong knowledge of data modeling and API integration.
Strong knowledge of data modeling and API integration.
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Full Stack Engineer JavaScript
Full Stack Engineer JavaScript
Staffworx Limited
West London (W10)
market rates, outside IR35, 6 months initial, long term extensions
Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
Design & develop GraphQL API services from schema, supergraph, subgraph design to production integration, ensuring performance, flexibility, and maintainability. * Collaborate in Agile teams, driving API strategy, reviewing pull requests, and improving delivery processes. * Familiarity with testing frameworks (Vitest, Playwright) for both API and end-to-end testing.
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Were looking for a hands-on Python Developer to join a high-performing team delivering modern applications and migrating legacy systems into scalable, web-based solutions. This is a fast-paced, delivery-focused role where youll work alongside experienced engineers on real-world, high-impact projects across multiple customer environments. * Building and maintaining Python-based back-end services (APIs, background tasks) * Developing web applications (Flask, FastAPI, or Django) * Supporting legacy system modernisation & data migrations * Working with SQL databases (PostgreSQL/MySQL) * Writing clean, testable code and contributing to CI/CD pipelines * Collaborating in a DevOps-driven, containerised (Docker) environment * Strong Python development experience * Experience with REST APIs & web frameworks (FastAPI, Flask or Django) * Solid understanding of SQL & data handling
Were looking for a hands-on Python Developer to join a high-performing team delivering modern applications and migrating legacy systems into scalable, web-based solutions. This is a fast-paced, delivery-focused role where youll work alongside experienced engineers on real-world, high-impact projects across multiple customer environments. * Building and maintaining Python-based back-end services (APIs, background tasks) * Developing web applications (Flask, FastAPI, or Django) * Supporting legacy system modernisation & data migrations * Working with SQL databases (PostgreSQL/MySQL) * Writing clean, testable code and contributing to CI/CD pipelines * Collaborating in a DevOps-driven, containerised (Docker) environment * Strong Python development experience * Experience with REST APIs & web frameworks (FastAPI, Flask or Django) * Solid understanding of SQL & data handling
You will support their ticket handling and ongoing development work following their recent go-live. This engagement will initially run for 1 month and will involve close collaboration with their in-house NAV/BC developer. * Providing support for our Business Central helpdesk tickets * Delivering work on newfeature requests * Strong reporting expertise, including Business CentraltoBI and Excel integrations via APIs * Ability to advise on the migration path from on-premise to SaaS * Comprehensive understanding of the Business Centralon-premise infrastructure (e.g., HTTPS printing, email configurations, and related scenarios) * Knowledge of CRM platforms with the ability to guide them on the recommended approach and considerations Potential for further project work. £450-500 per day. Based Hertfordshire / Remote
You will support their ticket handling and ongoing development work following their recent go-live. This engagement will initially run for 1 month and will involve close collaboration with their in-house NAV/BC developer. * Providing support for our Business Central helpdesk tickets * Delivering work on newfeature requests * Strong reporting expertise, including Business CentraltoBI and Excel integrations via APIs * Ability to advise on the migration path from on-premise to SaaS * Comprehensive understanding of the Business Centralon-premise infrastructure (e.g., HTTPS printing, email configurations, and related scenarios) * Knowledge of CRM platforms with the ability to guide them on the recommended approach and considerations Potential for further project work. £450-500 per day. Based Hertfordshire / Remote
72 exact matches jobs are outside your preferred location
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Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
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Develop and maintain Python code for data processing, API development, and integration with the Azure Databricks environment.
Develop and maintain Python code for data processing, API development, and integration with the Azure Databricks environment.
FEATURED
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A market leading client is looking for an Integration Architect who has strong Integration experience with Boomi. As an Integration Architect you will shape, design, and deliver modern integration solutions across a diverse enterprise landscape. This is a pivotal role for someone who thrives on solving complex problems, influencing technology direction, and enabling seamless connectivity across systems, data, and business processes. Responsibilities * Analyse business needs and objectives and provide strategic guidance on integration of IT systems. * Excellent Integration experience using Boomi. * Architect and guide integration patterns across Verint, Appian, and other enterprise platforms. * Communicate and present enterprise architecture vision and recommendations to senior management and stakeholders.
A market leading client is looking for an Integration Architect who has strong Integration experience with Boomi. As an Integration Architect you will shape, design, and deliver modern integration solutions across a diverse enterprise landscape. This is a pivotal role for someone who thrives on solving complex problems, influencing technology direction, and enabling seamless connectivity across systems, data, and business processes. Responsibilities * Analyse business needs and objectives and provide strategic guidance on integration of IT systems. * Excellent Integration experience using Boomi. * Architect and guide integration patterns across Verint, Appian, and other enterprise platforms. * Communicate and present enterprise architecture vision and recommendations to senior management and stakeholders.
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Implement robust state management and API integration * Collaborate with backend teams on API contracts and integration
Implement robust state management and API integration * Collaborate with backend teams on API contracts and integration
FEATURED
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Senior Test Manager
Senior Test Manager
Infoplus Technologies UK Ltd
City of London (EC3M)
From £450 to £500 per day Depends on Experience
Cloud and API led architecture experience.
Cloud and API led architecture experience.
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API integration
API integration
PREMIUM
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Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
Lead SIT/UAT cycles, manage defects, and validate interfaces (IDoc/BAPI/OData/API).
Lead SIT/UAT cycles, manage defects, and validate interfaces (IDoc/BAPI/OData/API).
Role Details - Role / Job Title: Solution Architect - Work Location: London - Role Type: Contracting - Office Requirement: 1 day in office - Role Overview - We are seeking an experienced Solution Architect to lead the design and governance of large-scale, enterprise cloud platforms built on AWS. This role requires deep technical expertise in AWS architecture, Infrastructure as Code (Terraform), CI/CD pipelines, and Python-based automation, combined with strong enterprise architecture, security, and stakeholder leadership skills. The successful candidate will define enterprise cloud strategy, establish architectural standards, and ensure consistent, secure, and scalable solution delivery across multiple business units and delivery teams. Key Responsibilities - Enterprise Architecture & Strategy * Define and own enterprise cloud architecture strategy aligned with business and IT roadmaps
Role Details - Role / Job Title: Solution Architect - Work Location: London - Role Type: Contracting - Office Requirement: 1 day in office - Role Overview - We are seeking an experienced Solution Architect to lead the design and governance of large-scale, enterprise cloud platforms built on AWS. This role requires deep technical expertise in AWS architecture, Infrastructure as Code (Terraform), CI/CD pipelines, and Python-based automation, combined with strong enterprise architecture, security, and stakeholder leadership skills. The successful candidate will define enterprise cloud strategy, establish architectural standards, and ensure consistent, secure, and scalable solution delivery across multiple business units and delivery teams. Key Responsibilities - Enterprise Architecture & Strategy * Define and own enterprise cloud architecture strategy aligned with business and IT roadmaps
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Solution Architect - PreSales, Bids, Digital Transformation.
Solution Architect - PreSales, Bids, Digital Transformation.
Sanderson Recruitment
City of London (EC1), EC1
£700 - £800 per day
Strategic Bid Architect / Pre Sales Solution Architect / Bid Solution Architect / Bid Architect - Solutions - This is a pivotal role in shaping, validating, and presenting complex digital, data, and AI-enabled solutions that are commercially competitive, architecturally robust, and operationally deliverable. Acting as the senior solution leader, the role is accountable for designing and governing advanced, cloud-native, and data-driven architectures for strategic, complex, and high-value bids, showcasing our clients digital design ethos and technical excellence. They ensure that all proposals are aligned to customer outcomes, compliant with requirements, and consistent with enterprise standards and delivery capability - delivering winning, sustainable propositions for our client. Working closely with the Growth and Business Development teams from the earliest stages of the ...
Strategic Bid Architect / Pre Sales Solution Architect / Bid Solution Architect / Bid Architect - Solutions - This is a pivotal role in shaping, validating, and presenting complex digital, data, and AI-enabled solutions that are commercially competitive, architecturally robust, and operationally deliverable. Acting as the senior solution leader, the role is accountable for designing and governing advanced, cloud-native, and data-driven architectures for strategic, complex, and high-value bids, showcasing our clients digital design ethos and technical excellence. They ensure that all proposals are aligned to customer outcomes, compliant with requirements, and consistent with enterprise standards and delivery capability - delivering winning, sustainable propositions for our client. Working closely with the Growth and Business Development teams from the earliest stages of the ...
FEATURED
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Test & AI Evaluation Lead
Test & AI Evaluation Lead
MarkIT Placements
Chilton, Didcot (OX11), OX11
From £550 to £750 per day depending on experience
Oversee automated testing across API and service layers, UI (E2E and accessibility), and infrastructure and deployment workflows.
Oversee automated testing across API and service layers, UI (E2E and accessibility), and infrastructure and deployment workflows.
Lead React Native Engineer / Engineering manager
Lead React Native Engineer / Engineering manager
Sanderson Recruitment
City of London (EC1), EC1
£600 - £700 per day + Outside IR35
Strong API/integration experience: REST / GraphQL, auth flows, contract design and resilience patterns
Strong API/integration experience: REST / GraphQL, auth flows, contract design and resilience patterns
FEATURED
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Jersey (Relocation Required ) * 12-month contract | Outside IR35 * Public Sector / Healthcare Transformation * Flexible working available - Were recruiting an experienced Solutions Architect for a long-term Outside IR35 contract supporting a high-profile public sector healthcare transformation programme in Jersey. This is a delivery-focused architecture role offering real autonomy, clear scope, and the opportunity to shape end-to-end solutions within a regulated, high-impact environment. Relocation to Jersey is required - What Youll Be Doing * Owning end-to-end solution architecture across applications, integration, data, and infrastructure * Translating enterprise architecture into practical, deliverable solution designs * Working closely with delivery teams across Agile and Waterfall programmes * Producing clear, high-quality architecture and design documentation
Jersey (Relocation Required ) * 12-month contract | Outside IR35 * Public Sector / Healthcare Transformation * Flexible working available - Were recruiting an experienced Solutions Architect for a long-term Outside IR35 contract supporting a high-profile public sector healthcare transformation programme in Jersey. This is a delivery-focused architecture role offering real autonomy, clear scope, and the opportunity to shape end-to-end solutions within a regulated, high-impact environment. Relocation to Jersey is required - What Youll Be Doing * Owning end-to-end solution architecture across applications, integration, data, and infrastructure * Translating enterprise architecture into practical, deliverable solution designs * Working closely with delivery teams across Agile and Waterfall programmes * Producing clear, high-quality architecture and design documentation
PREMIUM
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API integrations
API integrations
PREMIUM
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Experience of API technologies and writing Restful APIs in JSON
Experience of API technologies and writing Restful APIs in JSON
FEATURED
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Senior Java Developer (Contract) Java | Spring Boot | Kafka | Microservices | Kubernetes | AWS - London (Hybrid) | 912 Months | Competitive Day Rate - We are hiring a Senior Java Developer for a long-term contract within a major financial market infrastructure organisation in London. This role is focused on event-driven microservices, Kafka-based architectures, containerised deployments, and high-performance distributed systems. If your experience is primarily CRUD REST APIs without large-scale distributed systems exposure, this role will not be the right fit. Core Requirements (Must Have) * Strong Core Java development (Java 10+) * Extensive Spring Boot experience * Proven Microservices architecture experience * Hands-on Apache Kafka (producers, consumers, topics, partitions) * Experience building event-driven systems * Docker & Kubernetes in production
Senior Java Developer (Contract) Java | Spring Boot | Kafka | Microservices | Kubernetes | AWS - London (Hybrid) | 912 Months | Competitive Day Rate - We are hiring a Senior Java Developer for a long-term contract within a major financial market infrastructure organisation in London. This role is focused on event-driven microservices, Kafka-based architectures, containerised deployments, and high-performance distributed systems. If your experience is primarily CRUD REST APIs without large-scale distributed systems exposure, this role will not be the right fit. Core Requirements (Must Have) * Strong Core Java development (Java 10+) * Extensive Spring Boot experience * Proven Microservices architecture experience * Hands-on Apache Kafka (producers, consumers, topics, partitions) * Experience building event-driven systems * Docker & Kubernetes in production
My client is seeking a Technical Architect to design scalable, secure, and resilient solutions on Microsoft Azure. This role involves defining technical standards, guiding development teams, and ensuring architectural integrity across applications and platforms. The Architect will act as thecustodian of technical vision,ensuring that solutions align with both business needs and long-term technology strategy. Key Responsibilities * Define architecture blueprints for Azure-hosted applications. * Establish coding and configuration standards. * Collaborate with developers, testers, andother rolesto ensure alignment. * Oversee CI/CD pipeline design and integration. * Ensure security and compliance with industry frameworks * Document architecture decisions in Microsoft SharePoint. * Providetechnical guidance and resolve complex design challenges.
My client is seeking a Technical Architect to design scalable, secure, and resilient solutions on Microsoft Azure. This role involves defining technical standards, guiding development teams, and ensuring architectural integrity across applications and platforms. The Architect will act as thecustodian of technical vision,ensuring that solutions align with both business needs and long-term technology strategy. Key Responsibilities * Define architecture blueprints for Azure-hosted applications. * Establish coding and configuration standards. * Collaborate with developers, testers, andother rolesto ensure alignment. * Oversee CI/CD pipeline design and integration. * Ensure security and compliance with industry frameworks * Document architecture decisions in Microsoft SharePoint. * Providetechnical guidance and resolve complex design challenges.
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NSX-T Engineer / Architect SC Cleared
NSX-T Engineer / Architect SC Cleared
Sanderson Government and Defence
Farnborough (GU14), GU14
£550 - £750 per day
Position: NSX-T Engineer / Architect - Location: Farnborough - Day Rate: Market Rate - SC Clearance Required - Our defence client is seeking a highly skilled VMware NSX-T Engineer/Architect to play a key role in designing and delivering secure, resilient, and scalable network solutions across mission-critical environments. This is an opportunity to work at the forefront of software-defined networking within a complex, high-security landscape. Key Responsibilities * Lead the design, deployment, and administration of VMware NSX-T, including logical switching, routing, distributed firewalls, and micro- * Architect robust Layer 2/3 network solutions, with deep expertise in BGP, OSPF, STP, VLANs, and trunking. * Implement advanced firewalling and security controls, including segmentation strategies, IDS/IPS, and zero-trust methodologies.
Position: NSX-T Engineer / Architect - Location: Farnborough - Day Rate: Market Rate - SC Clearance Required - Our defence client is seeking a highly skilled VMware NSX-T Engineer/Architect to play a key role in designing and delivering secure, resilient, and scalable network solutions across mission-critical environments. This is an opportunity to work at the forefront of software-defined networking within a complex, high-security landscape. Key Responsibilities * Lead the design, deployment, and administration of VMware NSX-T, including logical switching, routing, distributed firewalls, and micro- * Architect robust Layer 2/3 network solutions, with deep expertise in BGP, OSPF, STP, VLANs, and trunking. * Implement advanced firewalling and security controls, including segmentation strategies, IDS/IPS, and zero-trust methodologies.
FEATURED
Contract £800 per day, Inside IR35 - London (Hybrid - 3 days onsite) Long-term contract until 2027 - NPPV2 & CTC required - We are recruiting for an experienced System Integration Delivery Lead to join a major enterprise transformation programme replacing legacy ERP and other systems with Oracle Fusion Cloud and a modern workforce management platform. This is a senior technical leadership role responsible for ensuring robust integration between platforms within a complex multi-vendor delivery environment supporting a large workforce. Key Responsibilities * Lead the end-to-end integration between the workforce management platform and Oracle Fusion. * Provide technical assurance and oversight of APIs, data mapping, integration architecture and workflows. * Ensure Oracle Fusion remains the master source of workforce data.
Contract £800 per day, Inside IR35 - London (Hybrid - 3 days onsite) Long-term contract until 2027 - NPPV2 & CTC required - We are recruiting for an experienced System Integration Delivery Lead to join a major enterprise transformation programme replacing legacy ERP and other systems with Oracle Fusion Cloud and a modern workforce management platform. This is a senior technical leadership role responsible for ensuring robust integration between platforms within a complex multi-vendor delivery environment supporting a large workforce. Key Responsibilities * Lead the end-to-end integration between the workforce management platform and Oracle Fusion. * Provide technical assurance and oversight of APIs, data mapping, integration architecture and workflows. * Ensure Oracle Fusion remains the master source of workforce data.
FEATURED
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Role: Automation Specialist (Discovery) Location: London (Hybrid) Type: Initial 4-week contract - Status: Outside IR35 - The role - Cedar are supporting a client undertaking a focused discovery of their transactional finance environment, with the objective of reducing manual processing through targeted automation, improved data flows and system efficiency. The current landscape relies heavily on Excel-based processes, manual journal handling, and data movement between ERP, banking platforms, and reporting outputs. There is limited use of structured automation. This engagement requires a hands-on specialist who can operate at the level of process, data, and tooling. You will analyse how data moves across the finance function, identify failure points and inefficiencies, and implement practical automation using the Microsoft stack.
Role: Automation Specialist (Discovery) Location: London (Hybrid) Type: Initial 4-week contract - Status: Outside IR35 - The role - Cedar are supporting a client undertaking a focused discovery of their transactional finance environment, with the objective of reducing manual processing through targeted automation, improved data flows and system efficiency. The current landscape relies heavily on Excel-based processes, manual journal handling, and data movement between ERP, banking platforms, and reporting outputs. There is limited use of structured automation. This engagement requires a hands-on specialist who can operate at the level of process, data, and tooling. You will analyse how data moves across the finance function, identify failure points and inefficiencies, and implement practical automation using the Microsoft stack.