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76 Contract API jobs in South East + 20 miles
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A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. * Axway's core products: Policy Studio, API Gateway, and API Manager. If you are an experienced professional with a background in API, MFT, or secure file transfers, this could be the perfect opportunity for you.
A top-tier defense organization is looking for an experienced Axway API Developer / Administrator to join their team on a 6-month contract. * Axway's core products: Policy Studio, API Gateway, and API Manager. If you are an experienced professional with a background in API, MFT, or secure file transfers, this could be the perfect opportunity for you.
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Up to £515 per day (Inside IR35) Remote / must be UK based - 3 months initially (open to extension) My client is an instantly recognisable consultancy who seek a - to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics. * Industry experience within financial services * Experience with Microsoft Power Platform (Power Automate, Powe
Up to £515 per day (Inside IR35) Remote / must be UK based - 3 months initially (open to extension) My client is an instantly recognisable consultancy who seek a - to lead the design and implementation of robust, secure, and scalable integrations for an end client. * Hands-on experience as a Senior Integration Developer, with D365 Finance integrations. * Deep knowledge of REST APIs, OData, DMF packages, and data mapping (XSLT, XML, JSON, CSV). * Proficiency in tools like Postman, Azure Logic Apps, PowerShell, and C#. * Experience with ETL processes, error handling, idempotency, and throttling. * Strong understanding of secure data handling, encryption, and compliance standards. * Familiarity with monitoring tools like Application Insights and Log Analytics. * Industry experience within financial services * Experience with Microsoft Power Platform (Power Automate, Powe
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Strong knowledge of the API/integration lifecycle, including design, deployment, and enhancement. * Expertise in RESTful & SOAP API design, APIM policy, and transformations. * Skilled in API/Integration security protocols & best practices. * Practical experience with Postman, API monitoring, and documentation tools. * Knowledge of Open API Specification, WSDL, SOAP, XSLT. * Application Insight proficiency in .NET and .NET Core (Web, API) and working knowledge of VS Code with Azure.
Strong knowledge of the API/integration lifecycle, including design, deployment, and enhancement. * Expertise in RESTful & SOAP API design, APIM policy, and transformations. * Skilled in API/Integration security protocols & best practices. * Practical experience with Postman, API monitoring, and documentation tools. * Knowledge of Open API Specification, WSDL, SOAP, XSLT. * Application Insight proficiency in .NET and .NET Core (Web, API) and working knowledge of VS Code with Azure.
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Previous work in API integration
Previous work in API integration
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We're looking for a Senior AWS Platform Engineer to play a hands-on role in a major API infrastructure migration project. * Kong API Gateway (hybrid model) * Strong understanding of API gateways (Kong)
We're looking for a Senior AWS Platform Engineer to play a hands-on role in a major API infrastructure migration project. * Kong API Gateway (hybrid model) * Strong understanding of API gateways (Kong)
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Software Developer - Active SC, Python, AWS
Software Developer - Active SC, Python, AWS
Hays
London
£400.0 - £425.0 per day + up to £425 per day (InsideIR35)
Proven experience as a software developer with data integration experience (API)
Proven experience as a software developer with data integration experience (API)
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Python Backend Developer - AWS
Python Backend Developer - AWS
Infoplus Technologies UK Ltd
London
From £300 to £350 per day Max GBP 350/day Inside IR35
GraphQL, API authentication, performance management, and internationalization
GraphQL, API authentication, performance management, and internationalization
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Strong experience with RESTful API development in microservice environments
Strong experience with RESTful API development in microservice environments
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Proficiency in JavaScript, Glide API, and ServiceNow development tools.
Proficiency in JavaScript, Glide API, and ServiceNow development tools.
D365 Finance Senior Integration Developer (remote)
D365 Finance Senior Integration Developer (remote)
Hays
London
£500.0 - £550.0 per day + c£510 per day (inside IR35)
We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Proficiency in tools like Postman, Azure Logic Apps, and scripting (e.g., C#, PowerShell) for API orchestration, along with ETL processes.
We are currently seeking a D365 Senior Integration Developer (finance) to design and implement integrations using D365 API's (e.g. Data Management Package, REST API, OData) You will develop automation processes for data transformation, upload, import and error handling in batch or near real-time modes. Proficiency in tools like Postman, Azure Logic Apps, and scripting (e.g., C#, PowerShell) for API orchestration, along with ETL processes.
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Expert-level knowledge of IAM, network security, encryption, API and application security, container security, and SIEM strategies.
Expert-level knowledge of IAM, network security, encryption, API and application security, container security, and SIEM strategies.
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Lead integration of data from SAP (e.g., S/4HANA, BW/4HANA) and external platforms using cloud and API technologies.
Lead integration of data from SAP (e.g., S/4HANA, BW/4HANA) and external platforms using cloud and API technologies.
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Loan IQ Technical Consultant - inside IR35
Loan IQ Technical Consultant - inside IR35
LA International Computer Consultants Ltd
London
£800 - £850 per day
oKnowledge of event management frameworks and API integrations.
oKnowledge of event management frameworks and API integrations.
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My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
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REST/SOAP API Integration: Building and consuming APIs for third-party integrations.
REST/SOAP API Integration: Building and consuming APIs for third-party integrations.
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API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
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Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a classified, com
Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a classified, com
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Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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Job Title: Web Solutions Engineer/Full Stack Engineer - Location: Address: 1-13 St Giles High St, London WC2H 8AG - Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially - As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
Job Title: Web Solutions Engineer/Full Stack Engineer - Location: Address: 1-13 St Giles High St, London WC2H 8AG - Mode of working: Hybrid (3 Days in the Office) Duration: 6+ Months contract initially - As a Web Solutions Engineer (WSE) you are responsible for building, designing, and deploying scalable, modern, web applications. You deliver full pieces of functionality on moderately complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. * Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL * Test, debug, maintain and/or update full-stack web applications. * Write and review technical documents, including design, development, and revision documents. * Collaborate with Product, UX, QA, and engineering teams, to deliver new features
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eSC Cleared Data Engineer - Bristol or London (Mostly working from home) Up to £745 per day (Umbrella, Inside IR35) Must hold live and transferrable Enhanced SC Security Clearance - About the Role - We're seeking an experienced Data Engineer to join a high-profile programme, working with cutting-edge cloud and data technologies. You'll be instrumental in building, optimising, and maintaining scalable data pipelines and platforms that underpin mission-critical systems. If you thrive on solving complex data challenges, working with modern orchestration tools, and applying best practices in security and compliance, this role offers both technical depth and impact. Key Responsibilities * Design & Optimise Pipelines - Build and refine ETL/ELT workflows using Apache Airflow for orchestration. * Data Ingestion - Create reliable ingestion processes from APIs and internal syst
eSC Cleared Data Engineer - Bristol or London (Mostly working from home) Up to £745 per day (Umbrella, Inside IR35) Must hold live and transferrable Enhanced SC Security Clearance - About the Role - We're seeking an experienced Data Engineer to join a high-profile programme, working with cutting-edge cloud and data technologies. You'll be instrumental in building, optimising, and maintaining scalable data pipelines and platforms that underpin mission-critical systems. If you thrive on solving complex data challenges, working with modern orchestration tools, and applying best practices in security and compliance, this role offers both technical depth and impact. Key Responsibilities * Design & Optimise Pipelines - Build and refine ETL/ELT workflows using Apache Airflow for orchestration. * Data Ingestion - Create reliable ingestion processes from APIs and internal syst
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We're looking for an experienced Engineering Manager to oversee the technical migration of a Product Information Management (PIM) system - namely STIBO STEP - from an on-premise setup to a SaaS solution. This role requires close collaboration with internal product and engineering teams, as well as with external partners. * 10+ years in software engineering and delivery, with at least 5 years in leadership, principal, or managerial roles. * Strong expertise in PIM/MDM platforms, with hands-on experience in STIBO STEP essential. * Proven track record migrating enterprise applications to SaaS, ideally within large-scale, complex environments. * Languages: Java 17+ (Java 21 preferred) * Frameworks: Micronaut (preferred), Spring Boot * Testing: JUnit, Mockito * Build Tools: Gradle * Data & Messaging: Kafka, MongoDB * APIs: GraphQL Federation, REST
We're looking for an experienced Engineering Manager to oversee the technical migration of a Product Information Management (PIM) system - namely STIBO STEP - from an on-premise setup to a SaaS solution. This role requires close collaboration with internal product and engineering teams, as well as with external partners. * 10+ years in software engineering and delivery, with at least 5 years in leadership, principal, or managerial roles. * Strong expertise in PIM/MDM platforms, with hands-on experience in STIBO STEP essential. * Proven track record migrating enterprise applications to SaaS, ideally within large-scale, complex environments. * Languages: Java 17+ (Java 21 preferred) * Frameworks: Micronaut (preferred), Spring Boot * Testing: JUnit, Mockito * Build Tools: Gradle * Data & Messaging: Kafka, MongoDB * APIs: GraphQL Federation, REST
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Our Client are looking for an SC cleared Frontend Engineer who thrives in environments where information is dense, the interface is critical, and the work matters. You excel at building responsive, intuitive UIs that surface complex machine learning insights to end users with clarity and usability. You care about the user journey as much as the underlying data, and you are motivated by delivering real-world impact in demanding operational settings. * Design and implement frontend interfaces that support live and retrospective exploration of data from complex systems * Build and iterate on React-based UIs for transcription review, dynamic querying, and data visualisation * Integrate user-facing features with backend APIs and machine learning services, including LLM outputs, NLP pipelines and structured data stores
Our Client are looking for an SC cleared Frontend Engineer who thrives in environments where information is dense, the interface is critical, and the work matters. You excel at building responsive, intuitive UIs that surface complex machine learning insights to end users with clarity and usability. You care about the user journey as much as the underlying data, and you are motivated by delivering real-world impact in demanding operational settings. * Design and implement frontend interfaces that support live and retrospective exploration of data from complex systems * Build and iterate on React-based UIs for transcription review, dynamic querying, and data visualisation * Integrate user-facing features with backend APIs and machine learning services, including LLM outputs, NLP pipelines and structured data stores
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Job Title: Firewall Engineer - Location: London or Gloucester (Hybrid) Contract Type: 6 months, Inside IR35 - Day Rate:£360 - The Role - Were looking for a skilled Firewall Engineer with active UK SC Clearance to join on a 6-month contract. Youll be responsible for firewall rule optimisation, configuration, and transformation activities across complex IT and OT environments. This role requires strong experience across multiple vendors (Palo Alto, Fortinet, Cisco ASA, Check Point) and the ability to collaborate with technical and non-technical stakeholders to maintain compliance and security best practice. Key Responsibilities * Configure, implement, and manage firewall solutions across multi-vendor environments * Review, optimise, and enforce firewall rules and policies * Support migrations and replacement projects for firewall infrastructure
Job Title: Firewall Engineer - Location: London or Gloucester (Hybrid) Contract Type: 6 months, Inside IR35 - Day Rate:£360 - The Role - Were looking for a skilled Firewall Engineer with active UK SC Clearance to join on a 6-month contract. Youll be responsible for firewall rule optimisation, configuration, and transformation activities across complex IT and OT environments. This role requires strong experience across multiple vendors (Palo Alto, Fortinet, Cisco ASA, Check Point) and the ability to collaborate with technical and non-technical stakeholders to maintain compliance and security best practice. Key Responsibilities * Configure, implement, and manage firewall solutions across multi-vendor environments * Review, optimise, and enforce firewall rules and policies * Support migrations and replacement projects for firewall infrastructure
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AI/ML engineer - SC clearance
AI/ML engineer - SC clearance
LA International Computer Consultants Ltd
EC1, City of London
£500 - £550 per day
Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London or Corsham - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a clas
Role: Backend engineer - Rate: IR35 Status yet to be determined - Location: Remote with occasional travel to London or Corsham - Duration: 6-month initial contract - SC clearance required. About the Role - You are a systems thinker with deep experience in backend engineering and distributed - data infrastructure. You thrive in high-stakes environments, know how to ship reliable - code fast, and are pragmatic about trade-o=s. You understand the unique constraints of - experimental, edge-deployable systems, especially in air-gapped environments where - resilience and autonomy matter most. This role focuses on building and adapting backend services to support experimental AI - systems deployed in sensitive Defence contexts. You will help create and manage - robust, portable pipelines for data ingestion, orchestration, model interaction, and - querying - all within a clas
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Locations
- London
- Surrey
- South East London
- City of London
- Watford
- Isleworth
- West End
- North West London
- Woking
- Central London
- Scotland
- Birmingham
- Wales
- Eastleigh
- Livingston
- Yorkshire
- Southampton
- Brighton
- North West
- Manchester
- Colchester
- Chester
- Essex
- Hampshire
- Lancashire
- Slough
- North East
- Midlothian
- Norwich
- Nottinghamshire
- Bristol
- Lee Bank
- Reading
- Leeds
- Midlands
- Rhiwderyn
- Milton Keynes
- Fareham
- Liverpool
- Swindon
- Stevenage
- Solihull
- East Anglia
- Dundee
- County Antrim
- Luton
- Blackpool
- Cambridge
- Glasgow
- West Midlands