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715 Permanent 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.
NEWFEATURED
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Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
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Halian Technology are searching for an Interim API Integrations Specialist to join our client's forward-thinking technology team. * Design, develop, and maintain API integrations between internal systems and external SaaS platforms. * Build and maintain API documentation, providing guidance on integration best practices. * Familiarity with RESTful API design, OAuth2/API authentication, and workflow automation (Power Automate). * Familiarity with Power Apps, Power BI, Microsoft Graph API, Azure Logic Apps/Functions, and Dataverse. Apply now and help energise the future with your expertise in API integration.
Halian Technology are searching for an Interim API Integrations Specialist to join our client's forward-thinking technology team. * Design, develop, and maintain API integrations between internal systems and external SaaS platforms. * Build and maintain API documentation, providing guidance on integration best practices. * Familiarity with RESTful API design, OAuth2/API authentication, and workflow automation (Power Automate). * Familiarity with Power Apps, Power BI, Microsoft Graph API, Azure Logic Apps/Functions, and Dataverse. Apply now and help energise the future with your expertise in API integration.
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Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
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D365 Senior Developer - D365 Finance, APIS, Azure
D365 Senior Developer - D365 Finance, APIS, Azure
Hays
London
£500.0 - £515.0 per day + up to £515 pd (InsideIR35)
Up to £515 per day (Inside IR35) Remote / must be UK based - 12 months - We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * Experience in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
Up to £515 per day (Inside IR35) Remote / must be UK based - 12 months - We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * Experience in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
NEW
D365 Senior Developer - D365 Finance, APIS, Azure
D365 Senior Developer - D365 Finance, APIS, Azure
Hays
London
£500.0 - £515.0 per day + up to £515 pd (InsideIR35)
Up to £515 per day (Inside IR35) Remote / must be UK based - 12 months - We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * 5+ years in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
Up to £515 per day (Inside IR35) Remote / must be UK based - 12 months - We're looking for an experienced D365 Finance & Operations Developer to lead the development of custom journal processing extensions. This role suits someone with strong X++ skills and a deep understanding of D365 Finance, especially in high-volume, cross-functional environments. * 5+ years in D365 F&O development (X++, data entities, extensions). * Experience with general ledger, journals, financial dimensions, and intercompany transactions. * Strong knowledge of Visual Studio, LCS, Azure DevOps, and CI/CD pipelines. * Proficient in Power BI: report creation, configuration, and export. * Skilled in workflows, security roles, SSRS, and unit testing (SysTest). * Familiar with DMF, OData, batch processing, and error handling. * Ability to optimize performance for high-volume transactions.
NEW
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AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
AMS is a global workforce solutions partner committed to creating inclusive, dynamic, and future-ready workplaces. We help organisations adapt, grow, and thrive in an ever-evolving world by building, shaping, and optimising diverse talent strategies. Our Contingent Workforce Solutions (CWS) is one of our service offerings. Acting as an extension of their recruitment teams, we connect them with skilled interim and temporary professionals, fostering workplaces where everyone can contribute and succeed. Our client, a major UK retail bank, provides every day banking services to over 17 million retail customers. The banks expertise and services span across Business Services, Corporate banking, Wealth Management, Group Functions, Retail and Investment Banking. On behalf of this organisation, AMS are looking for 3 - Full Stack Developers for acontract until end of 2025 based
NEWFEATURED
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Solid background in Apex, LWC, SOQL, and REST/SOAP API integration.
Solid background in Apex, LWC, SOQL, and REST/SOAP API integration.
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Exposure to Swift Vapor for server-side API development (desirable, not essential).
Exposure to Swift Vapor for server-side API development (desirable, not essential).
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You'll work across modern architectures, leveraging containerisation, event-driven design, and API-first principles to solve complex integration challenges. * Design and manage secure REST/GraphQL APIs via API Gateway, including authentication, throttling, and schema validation. * Apply best practices in Kubernetes and API security, including TLS, KMS, RBAC, and service-to-service authentication. * Strong API design and security expertise (OpenAPI, OAuth2, JWT).
You'll work across modern architectures, leveraging containerisation, event-driven design, and API-first principles to solve complex integration challenges. * Design and manage secure REST/GraphQL APIs via API Gateway, including authentication, throttling, and schema validation. * Apply best practices in Kubernetes and API security, including TLS, KMS, RBAC, and service-to-service authentication. * Strong API design and security expertise (OpenAPI, OAuth2, JWT).
PREMIUM
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AI Solution Architect (AI Agents, Retail / eCommerce)
AI Solution Architect (AI Agents, Retail / eCommerce)
Staffworx Limited
WC1A, Central London
market rates, outside IR35 or permanent
Utilize AWS services (Lambda, S3, API Gateway, SageMaker, DynamoDB, ECS, etc.) to deploy scalable AI solutions. * Experience with AI/ML frameworks such as TensorFlow, PyTorch, OpenAI API, or LangChain. * Strong understanding of API design, including REST, GraphQL, and WebSockets.
Utilize AWS services (Lambda, S3, API Gateway, SageMaker, DynamoDB, ECS, etc.) to deploy scalable AI solutions. * Experience with AI/ML frameworks such as TensorFlow, PyTorch, OpenAI API, or LangChain. * Strong understanding of API design, including REST, GraphQL, and WebSockets.
API Integration
API Integration
NEWFEATURED
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Experience working with software systems including querying, SQL scripting, and working with API development * Technical understanding of Meta advertising products (including Ads and Pages API, Identity Platform) * Experience working with API documents, calling APIs using scripts, and testing APIs
Experience working with software systems including querying, SQL scripting, and working with API development * Technical understanding of Meta advertising products (including Ads and Pages API, Identity Platform) * Experience working with API documents, calling APIs using scripts, and testing APIs
Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
PREMIUM
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Collaborate with the Product team to understand the business requirements, and formulate design documentation, both high enterprise-level and low API levels
Collaborate with the Product team to understand the business requirements, and formulate design documentation, both high enterprise-level and low API levels
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Awareness of Dataverse API
Awareness of Dataverse API
NEW
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.NET Framework Version 4.5 or above including strong WCF\ Web API experience
.NET Framework Version 4.5 or above including strong WCF\ Web API experience
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.NET Framework Version 4.5 or above including strong WCF\ Web API experience
.NET Framework Version 4.5 or above including strong WCF\ Web API experience
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Undertake development of customising Dataverse, canvas apps, API integrations with 3rd party systems.
Undertake development of customising Dataverse, canvas apps, API integrations with 3rd party systems.
Integration Developer-Azure-Salesforce-Student records
Integration Developer-Azure-Salesforce-Student records
InterQuest Group (UK) Limited
London
£450 per day
The role will focus on building and support integrations between new and existing systems using Microsoft Azure PaaS components to develop modular, reusable, and secure integration components aligned with canonical data models and modern API-first principles. * experience with Azure PaaS integration tools: Logic Apps, Functions, API Management, Service Bus, Event Grid * Experience building and managing REST APIs and implementing API-first integration designs * Exposure to OpenAPI/Swagger, API lifecycle management, and version control best practices.
The role will focus on building and support integrations between new and existing systems using Microsoft Azure PaaS components to develop modular, reusable, and secure integration components aligned with canonical data models and modern API-first principles. * experience with Azure PaaS integration tools: Logic Apps, Functions, API Management, Service Bus, Event Grid * Experience building and managing REST APIs and implementing API-first integration designs * Exposure to OpenAPI/Swagger, API lifecycle management, and version control best practices.
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Experience with API development and Git.
Experience with API development and Git.
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Implement and manage API and UI performance testing using JMeter, ensuring scalability and responsiveness of applications. * Utilize Fetch API to automate interactions with web services and validate data flows.
Implement and manage API and UI performance testing using JMeter, ensuring scalability and responsiveness of applications. * Utilize Fetch API to automate interactions with web services and validate data flows.
FEATURED
API testing using coded frameworks and Postman.
API testing using coded frameworks and Postman.
PREMIUM
The candidate will hold specialization in designing web applications, middleware/API layer and AWS.
The candidate will hold specialization in designing web applications, middleware/API layer and AWS.
NEW
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• API Knowledge: Experience with APIs, web services, and data exchange formats.
• API Knowledge: Experience with APIs, web services, and data exchange formats.
NEW
Related Jobs
Locations
- London
- Surrey
- City of London
- Canary Wharf
- Slough
- Guildford
- South East London
- Isleworth
- Tunbridge Wells
- Central London
- Birmingham
- Scotland
- Dundee
- Plymouth
- East Anglia
- Hampshire
- Reading
- Midlands
- Manchester
- Kent
- Wales
- West Sussex
- Derby
- East Midlands
- Yorkshire
- Southampton
- Bristol
- Chester
- Milton Keynes
- Leicester
- Midlothian
- Portsmouth
- Livingston
- Lancashire
- Nottinghamshire
- Cambridgeshire
- Glasgow
- Bath
- Colchester
- Sheffield
- Nottingham
- Leeds
- North West
- Cambridge
- Exeter
- Cheltenham
- Bracknell
- Oxfordshire
- Basingstoke
- Bournemouth