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178 Permanent API jobs in Hertfordshire + 20 miles
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Senior API Technical Consultant (GraphQL Specialist)
Senior API Technical Consultant (GraphQL Specialist)
Staffworx Limited
Slough (SL1)
market rates, outside IR35, 2 days on site
Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Expert levelGraphQL, including advanced API design, schema evolution, performance optimisation.
Lead the designand evolution of our API schemas, ensuring they meet the complex demands of a rapidly growing platform. * Expert levelGraphQL, including advanced API design, schema evolution, performance optimisation.
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TypeScript Developer Full Stack - Fintech
TypeScript Developer Full Stack - Fintech
Client Server
Shoreditch, East London (E1), EC2A
£50000 - £60000 per annum + benefits
TypeScript Developer / Engineer (Full Stack API React) London / WFH to £60k - Apply now to find out more about this TypeScript Developer / Engineer (Full Stack API React) opportunity.
TypeScript Developer / Engineer (Full Stack API React) London / WFH to £60k - Apply now to find out more about this TypeScript Developer / Engineer (Full Stack API React) opportunity.
PREMIUM
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This role is ideal for someone who specialises in system integration, API design, and cloud-based architecture (Azure) and enjoys shaping strategy as well as guiding delivery teams. * Design and govern API-led integrations, interface specifications, message schemas, and data flows. * Hands-on knowledge of Microsoft Azure integration services (API Management, Service Bus, Logic Apps, Event Grid, etc.) * Strong understanding of enterprise integration patterns, API management platforms (Apigee/Azure API Mgmt)
This role is ideal for someone who specialises in system integration, API design, and cloud-based architecture (Azure) and enjoys shaping strategy as well as guiding delivery teams. * Design and govern API-led integrations, interface specifications, message schemas, and data flows. * Hands-on knowledge of Microsoft Azure integration services (API Management, Service Bus, Logic Apps, Event Grid, etc.) * Strong understanding of enterprise integration patterns, API management platforms (Apigee/Azure API Mgmt)
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API-first and integration platforms
API-first and integration platforms
NEW
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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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Utilise Fetch API to automate interactions with web services and validate data flows.
Utilise Fetch API to automate interactions with web services and validate data flows.
FEATURED
RESTful API design and implementation expertise
RESTful API design and implementation expertise
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Backend Engineer
Backend Engineer
Plexus Resource Solutions Ltd
City of London (EC1)
From £100,000 to £150,000 per annum
Develop an API used in the product as well as their users
Develop an API used in the product as well as their users
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Expertise on Oracle Simphony, API knowledge, Knowledge of Product Limitations
Expertise on Oracle Simphony, API knowledge, Knowledge of Product Limitations
Technical Architect (Azure) - £100,000 – £120,000 pa + Bonus + Benefit
Technical Architect (Azure) - £100,000 – £120,000 pa + Bonus + Benefit
JNC Recruitment Limited
Central London, London
From £100,000 to £120,000 per annum
JNC are working with a leading Insurance client that are looking for an established Technical Architect who specialises in integration architecture, system design and API design within the insurance market. * Extensive experience with API implementations, Message Queues and Event Driven Architecture. * Expert skills with RESTful API design and API Gateway management.
JNC are working with a leading Insurance client that are looking for an established Technical Architect who specialises in integration architecture, system design and API design within the insurance market. * Extensive experience with API implementations, Message Queues and Event Driven Architecture. * Expert skills with RESTful API design and API Gateway management.
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API and SDK automation, metadata ingestion and catalogue enrichment
API and SDK automation, metadata ingestion and catalogue enrichment
Azure Cosmos DB (SQL/Mongo API), NoSQL modelling
Azure Cosmos DB (SQL/Mongo API), NoSQL modelling
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API integrations
API integrations
FEATURED
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Martech Product Owner (iGaming)
Martech Product Owner (iGaming)
Technically Gifted Ltd
City of London (EC1V)
From £70,000 to £80,000 per annum
Ensure scalable, resilient API integration between MarTech tools, the Bonus Engine, product systems, and data warehouses - Define and manage the Bonus Engine roadmap, evolving API capabilities and reward mechanics to support campaign efficiency and player engagement.
Ensure scalable, resilient API integration between MarTech tools, the Bonus Engine, product systems, and data warehouses - Define and manage the Bonus Engine roadmap, evolving API capabilities and reward mechanics to support campaign efficiency and player engagement.
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Senior/Lead Full Stack Developer (React / Python) AI Start up!
Senior/Lead Full Stack Developer (React / Python) AI Start up!
Robert Half
City of London (EC1)
Negotiable
API & database experience
API & database experience
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Knowledge of ServiceNow scripting (JavaScript, Glide API) a plus.
Knowledge of ServiceNow scripting (JavaScript, Glide API) a plus.
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Senior/Lead Full Stack Developer (React / Python) AI Start up!
Senior/Lead Full Stack Developer (React / Python) AI Start up!
Robert Half
City of London (EC1)
Negotiable
API & database experience
API & database experience
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Senior Identity & Access Management Engineer – Typescript, C#, AWS IAM
Senior Identity & Access Management Engineer – Typescript, C#, AWS IAM
Smart Sourcer Limited
City of London (EC1)
From £85,000 to £90,000 per annum + bonus + benefits
Deliver secure login, SSO, MFA, RBAC/ABAC, and tenant isolation at scale, leveraging AWS services (Lambda, IAM, CloudFront, API Gateway, CDK) Solid AWS expertise (IAM, Lambda, API Gateway, CDK)
Deliver secure login, SSO, MFA, RBAC/ABAC, and tenant isolation at scale, leveraging AWS services (Lambda, IAM, CloudFront, API Gateway, CDK) Solid AWS expertise (IAM, Lambda, API Gateway, CDK)
NEW
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Assist with company technical direction and architecture for mobile, cloud and API platforms
Assist with company technical direction and architecture for mobile, cloud and API platforms
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Skilled in building robust, optimized API endpoints.
Skilled in building robust, optimized API endpoints.
NEW
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We are looking for a strong Full Stack Developer to deliver a short-term project involving a static website build, API scraping, and structured JSON output. * Develop API scraping scripts to extract structured data reliably * Proven experience building API scrapers (Axios, Puppeteer, BeautifulSoup, Cheerio, or similar) * Knowledge of API rate limits and bypass methods
We are looking for a strong Full Stack Developer to deliver a short-term project involving a static website build, API scraping, and structured JSON output. * Develop API scraping scripts to extract structured data reliably * Proven experience building API scrapers (Axios, Puppeteer, BeautifulSoup, Cheerio, or similar) * Knowledge of API rate limits and bypass methods
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Applications Support Analyst / Engineer
Applications Support Analyst / Engineer
Kudos Partners
Datchet Common, Slough (SL3), SL3
£75,000 per annum plus 12% bonus - generous benefits package
API support and monitoring tools (e.g., SolarWinds, AzureAppInsights)
API support and monitoring tools (e.g., SolarWinds, AzureAppInsights)
Backend Developer .NET
Backend Developer .NET
Adroit People Ltd
The City, City of London (EC2), EC2N 1HQ
From £400 to £425 per day
Work with Service Bus, Azure SQL, API Management, and Key Vault to deliver robust, secure, and scalable solutions. * Collaborate with front-end engineers to ensure efficient API design and cohesive end-to-end workflows. * Strong experience with Azure, including Container Apps, Functions, Service Bus, Networking and API Management.
Work with Service Bus, Azure SQL, API Management, and Key Vault to deliver robust, secure, and scalable solutions. * Collaborate with front-end engineers to ensure efficient API design and cohesive end-to-end workflows. * Strong experience with Azure, including Container Apps, Functions, Service Bus, Networking and API Management.
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Data Engineer
Data Engineer
McGregor Boyall Associates Limited
Turnham Green, West London (W4), W4 1SY
£30000 - £35000 per annum
Develop API integrations to connect multiple business systems
Develop API integrations to connect multiple business systems
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Azure Cosmos DB Admin and Developer
Azure Cosmos DB Admin and Developer
Vallum Associates Limited
The City, City of London (EC4), EC4M
£500 per hour
This role involves architecting cloud-native solutions using Azure Cosmos DB (SQL API and Mongo API), implementing effective partitioning strategies, indexing, and consistency models to support real-time financial data processing. Architect and develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API)
This role involves architecting cloud-native solutions using Azure Cosmos DB (SQL API and Mongo API), implementing effective partitioning strategies, indexing, and consistency models to support real-time financial data processing. Architect and develop cloud-native applications using Azure Cosmos DB (SQL API, Mongo API)