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12 Contract API jobs in The City, City of London + 20 miles
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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).
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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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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
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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AI Automation Developer Consultant - London, £550pd
AI Automation Developer Consultant - London, £550pd
Langley James Limited
St James, South West London (SW1), WC2N 5HS
£525 - £550 per day
AI Automation Developer Consultant for 6 months to design, develop, and maintain intelligent automation solutions across an Insurance Firm based in the City of London paying upto £550 per day, inside IR35 in a Hybrid role (Predominantly Office based initially and then 3/4 Office Days) . The AI Automation Developer must have a proven track record of actually implementing/delivering AI Automations. The role focuses on leveraging the Microsoft technology stack, including Copilot Enterprise, Power Apps, Azure services, Python, and OpenAI technologies, to streamline workflows, enhance operational efficiency, and support data-driven decision making. The successful candidate will work closely with the Innovations Team, Data, IT, operations, and business stakeholders to identify automation opportunities, implement scalable AI solutions, and ensure strong governance, security, ...
AI Automation Developer Consultant for 6 months to design, develop, and maintain intelligent automation solutions across an Insurance Firm based in the City of London paying upto £550 per day, inside IR35 in a Hybrid role (Predominantly Office based initially and then 3/4 Office Days) . The AI Automation Developer must have a proven track record of actually implementing/delivering AI Automations. The role focuses on leveraging the Microsoft technology stack, including Copilot Enterprise, Power Apps, Azure services, Python, and OpenAI technologies, to streamline workflows, enhance operational efficiency, and support data-driven decision making. The successful candidate will work closely with the Innovations Team, Data, IT, operations, and business stakeholders to identify automation opportunities, implement scalable AI solutions, and ensure strong governance, security, ...
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Senior VMware Engineer SC Cleared
Senior VMware Engineer SC Cleared
Sanderson Government and Defence
City of London (EC1), EC1
£450 - £513 per day
Position: Senior VMware Engineer - Location: Hybrid / London - Day Rate: £500 p.d inside IR35 - SC Clearance Required - A leading consultancy is supporting a flagship central-government transformation and is looking for a Senior VMware & Automation Engineer to help modernise and automate a large, secure virtual infrastructure estate. This role is ideal for someone who enjoys building reliable automation at scale and wants their work to have national impact. The role - You'll lead automated VM lifecycle management across a complex VMware environment, creating efficient provisioning pipelines and improving how the platform is delivered, secured, and operated. You'll work closely with platform SMEs and engineering teams to ensure consistent, compliant, and high-quality VM operations. Key responsibilities * Build and optimise automated VM provisioning and lifecycle workflows using PowerCLI, ...
Position: Senior VMware Engineer - Location: Hybrid / London - Day Rate: £500 p.d inside IR35 - SC Clearance Required - A leading consultancy is supporting a flagship central-government transformation and is looking for a Senior VMware & Automation Engineer to help modernise and automate a large, secure virtual infrastructure estate. This role is ideal for someone who enjoys building reliable automation at scale and wants their work to have national impact. The role - You'll lead automated VM lifecycle management across a complex VMware environment, creating efficient provisioning pipelines and improving how the platform is delivered, secured, and operated. You'll work closely with platform SMEs and engineering teams to ensure consistent, compliant, and high-quality VM operations. Key responsibilities * Build and optimise automated VM provisioning and lifecycle workflows using PowerCLI, ...
FEATURED
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Senior JavaScript Developer
Senior JavaScript Developer
SCALERS GROUP LIMITED
The City, City of London (EC4), EC4N 6AP
From £600 to £650 per day
Experience with Rest API's and GraphQL
Experience with Rest API's and GraphQL
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Senior .Net Developer - Fully Remote
Senior .Net Developer - Fully Remote
G.R.E. Recruitment Limited
City of London (EC1)
Up to £75,000 per annum - Fully Remote - Initial 6 Month FTC Role
Experience of developing REST API's and web services.
Experience of developing REST API's and web services.
Java Developer
Java Developer
Sanderson Government and Defence
City of London (EC1), EC1
Up to £550 per day + Inside IR35
The ideal candidate has strong experience in core Java, modern frameworks, API development, and cloud-based architectures.
The ideal candidate has strong experience in core Java, modern frameworks, API development, and cloud-based architectures.
FEATURED
Full stack Developer React
Full stack Developer React
SCALERS GROUP LIMITED
The City, City of London (EC2), EC3V 3LA
From £500 to £550 per day
Experience with Rest API's and GraphQL
Experience with Rest API's and GraphQL
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Experience integrating UI with RESTful API services.
Experience integrating UI with RESTful API services.
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GenAI Specialist
GenAI Specialist
Velocity Talent Ltd
Bromley (BR1)
From £500 to £550 per day £500 TO £550 A DAY inside IR35
Minimum 5 years in Python programming, including OOPs, data structures, Stacks, Queues, Scripting, Linkedlists, Arrays, and API development. Experience with API Gateway development and deployment on Azure/GCP.
Minimum 5 years in Python programming, including OOPs, data structures, Stacks, Queues, Scripting, Linkedlists, Arrays, and API development. Experience with API Gateway development and deployment on Azure/GCP.
22 exact matches jobs are outside your preferred location
Solid understanding of cloud-based architectures, especially Azure or AWS, including API
Solid understanding of cloud-based architectures, especially Azure or AWS, including API
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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.
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).
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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.
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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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Role: Backend Engineer (ATA) Location: United Kingdom (Remote work) Skills: Java, AWS, Spring Boot, REST APIs,MySQL - We are looking for a Backend Engineer to join the Core Portal team and build scalable backend services for an enterprise discovery application. You will design and develop robust APIs, integrate with search and knowledge graph platforms, and ensure high performance, reliability, and security of backend systems. * Develop and maintain backend services using Java, Spring Boot, AWS * Build and optimize REST and GraphQL APIs * Ensure code quality through testing, refactoring, and best practices * Own services end-to-end, including deployment, monitoring, and production support * Handle production incidents, perform root cause analysis, and improve system reliability * Contribute to system design, architecture discussions, and documentation
Role: Backend Engineer (ATA) Location: United Kingdom (Remote work) Skills: Java, AWS, Spring Boot, REST APIs,MySQL - We are looking for a Backend Engineer to join the Core Portal team and build scalable backend services for an enterprise discovery application. You will design and develop robust APIs, integrate with search and knowledge graph platforms, and ensure high performance, reliability, and security of backend systems. * Develop and maintain backend services using Java, Spring Boot, AWS * Build and optimize REST and GraphQL APIs * Ensure code quality through testing, refactoring, and best practices * Own services end-to-end, including deployment, monitoring, and production support * Handle production incidents, perform root cause analysis, and improve system reliability * Contribute to system design, architecture discussions, and documentation
Role: Backend Engineer (ATA) Location: United Kingdom (Remote work) Skills: Java, AWS, Spring Boot, REST APIs,MySQL - We are looking for a Backend Engineer to join the Core Portal team and build scalable backend services for an enterprise discovery application. You will design and develop robust APIs, integrate with search and knowledge graph platforms, and ensure high performance, reliability, and security of backend systems. * Develop and maintain backend services using Java, Spring Boot, AWS * Build and optimize REST and GraphQL APIs * Ensure code quality through testing, refactoring, and best practices * Own services end-to-end, including deployment, monitoring, and production support * Handle production incidents, perform root cause analysis, and improve system reliability * Contribute to system design, architecture discussions, and documentation
Role: Backend Engineer (ATA) Location: United Kingdom (Remote work) Skills: Java, AWS, Spring Boot, REST APIs,MySQL - We are looking for a Backend Engineer to join the Core Portal team and build scalable backend services for an enterprise discovery application. You will design and develop robust APIs, integrate with search and knowledge graph platforms, and ensure high performance, reliability, and security of backend systems. * Develop and maintain backend services using Java, Spring Boot, AWS * Build and optimize REST and GraphQL APIs * Ensure code quality through testing, refactoring, and best practices * Own services end-to-end, including deployment, monitoring, and production support * Handle production incidents, perform root cause analysis, and improve system reliability * Contribute to system design, architecture discussions, and documentation
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.
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
Role: Senior Backend Developer - Type:Fixed Term Employment (1year) Location: UK (Remote) Client:Tavant Technologies - Mandatory Skills - Java, Spring Boot - Experience 8+ years - Job Description - We are looking for a Senior Backend Developer with strong experience in Java, Spring Boot, microservices architecturesto design, build, and scale backend systems in a cloud-native environment. The role requires a hands-on engineer who can deliver high-quality services, collaborate across teams, and contribute to architectural and design decisions. Roles & Responsibilities * Design, develop, and maintain scalable backend servicesusing Java and Spring Boot * Build and support microservices-based architectureswith high availability and performance * Develop and consume RESTful APIsand event-driven services * Collaborate with frontend, DevOps, and product teams to deliver end-to-end solutions
Role: Senior Backend Developer - Type:Fixed Term Employment (1year) Location: UK (Remote) Client:Tavant Technologies - Mandatory Skills - Java, Spring Boot - Experience 8+ years - Job Description - We are looking for a Senior Backend Developer with strong experience in Java, Spring Boot, microservices architecturesto design, build, and scale backend systems in a cloud-native environment. The role requires a hands-on engineer who can deliver high-quality services, collaborate across teams, and contribute to architectural and design decisions. Roles & Responsibilities * Design, develop, and maintain scalable backend servicesusing Java and Spring Boot * Build and support microservices-based architectureswith high availability and performance * Develop and consume RESTful APIsand event-driven services * Collaborate with frontend, DevOps, and product teams to deliver end-to-end solutions
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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
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eDV-cleared Technical Consultants - Automation, Catalogue Migration
eDV-cleared Technical Consultants - Automation, Catalogue Migration
PS Computer Services Ltd t/a Parker Shaw
London
Unspecified Negotiable (inside IR35)
We are currently recruiting for multiple experienced Technical Consultants to fill a 6-9 month contract for our client working full-time in either London or Cheltenham. These roles will be supporting a OTSM Migration Project. This role is available in either London or Cheltenham and is 100% on-site. Enhanced DV clearance is mandatory. What The Roles Offer - Team Collaboration: Be part of a small, established team that works closely with clients and external vendors, fostering strong professional relationships. Supportive Environment: Receive supportive engagement from your manager and be part of a friendly and diverse team. Professional Growth: Access to training and opportunities to obtain and maintain appropriate certifications through training and memberships. Global Opportunities: Explore local and worldwide growth opportunities within Professional Services and the wider ...
We are currently recruiting for multiple experienced Technical Consultants to fill a 6-9 month contract for our client working full-time in either London or Cheltenham. These roles will be supporting a OTSM Migration Project. This role is available in either London or Cheltenham and is 100% on-site. Enhanced DV clearance is mandatory. What The Roles Offer - Team Collaboration: Be part of a small, established team that works closely with clients and external vendors, fostering strong professional relationships. Supportive Environment: Receive supportive engagement from your manager and be part of a friendly and diverse team. Professional Growth: Access to training and opportunities to obtain and maintain appropriate certifications through training and memberships. Global Opportunities: Explore local and worldwide growth opportunities within Professional Services and the wider ...