Date posted
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Locations
Locations
Salaries
Date posted
Type of Company
Job types
3 Permanent API jobs in Haslemere Industrial Estate, Welwyn + 20 miles
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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
Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
Perform Dataverse customizations, SQL queries, and CRUD operations using REST/Web API calls. * JavaScript (customizations & API calls)
NEW
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JavaScript Developer - Hybrid Remote
JavaScript Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
N7, North London
From £80,000 to £100,000 per annum + Benefits
JavaScript Developer - Location: 3-4 days per wk from home / 1-2 days in London - Salary: Circa 80k 100k + Benefits - JavaScript Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4 years backend development experience * Solid expertise in Node.js * Experience integrating LLM APIs and open-source models into production systems * Hands-on work implementing Retrieval-Augmented Generation (RAG) pipelines * Experience designing and optimizing agentic AI workflows - Tremendous opportunity offering plenty of scope for career progression in a friendly, inno
JavaScript Developer - Location: 3-4 days per wk from home / 1-2 days in London - Salary: Circa 80k 100k + Benefits - JavaScript Developer required byrequired by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need to be a machine learning researcher but you do need to know how to integrate modern AI capabilities into productions * At least 4 years backend development experience * Solid expertise in Node.js * Experience integrating LLM APIs and open-source models into production systems * Hands-on work implementing Retrieval-Augmented Generation (RAG) pipelines * Experience designing and optimizing agentic AI workflows - Tremendous opportunity offering plenty of scope for career progression in a friendly, inno
66 exact matches jobs are outside your preferred location
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Senior Full Stack Developer JavaScript Python API
Senior Full Stack Developer JavaScript Python API
Client Server
W6, West London
£85000 - £100000 per annum
Senior Full Stack Developer / Engineer (JavaScript Python API) London to £100k - Apply now to find out more about this Senior Full Stack Developer / Engineer (JavaScript Python API) opportunity.
Senior Full Stack Developer / Engineer (JavaScript Python API) London to £100k - Apply now to find out more about this Senior Full Stack Developer / Engineer (JavaScript Python API) opportunity.
NEWPREMIUM
Fidessa Developer Java - Capital Markets
Fidessa Developer Java - Capital Markets
Client Server
The City, EC3
£100000 - £135000 per annum + bonus + benefits
Fidessa Developer (Java Spring Boot API) London to £135k - As a Fidessa Developer (Java Spring Boot API) you will receive a competitive - Apply now to find out more about this Fidessa Developer (Java Spring Boot API) opportunity.
Fidessa Developer (Java Spring Boot API) London to £135k - As a Fidessa Developer (Java Spring Boot API) you will receive a competitive - Apply now to find out more about this Fidessa Developer (Java Spring Boot API) opportunity.
NEWPREMIUM
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Integration Architect
Integration Architect
Lynx Recruitment Limited
SW1W, South West London
From £85,000 to £100,000 per annum
Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design - Solid understanding of SOA, REST, and API management principles - Proficient with XSD, XML, XSLT, JSON, API
Create high-level architectural assets, including API catalogues, application and connectivity models, guiding detailed design - Solid understanding of SOA, REST, and API management principles - Proficient with XSD, XML, XSLT, JSON, API
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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
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
NEW
Deep understanding of RESTful API design and integration
Deep understanding of RESTful API design and integration
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Strong knowledge of system architecture, cloud solutions, and API design
Strong knowledge of system architecture, cloud solutions, and API design
NEW
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Lead Java SDET
Lead Java SDET
Deerfoot Recruitment Solutions
The City, EC4N 6JD
£90000 - £120000 per annum + Benefits + Bonus + Hybrid Working
Lead SDET | SDET | Software Development Engineer in Test | Test Manager | Test Lead | Lead Test Engineer | Principal Test Engineer | QA Lead | Quality Assurance Lead | Software Test Lead | Automation Lead | Java | Unit Testing | Contract Testing | REST | API | Java OOP | API Testing | Cucumber | Selenium WebDriver | JSON | Performance Testing | Leadership
Lead SDET | SDET | Software Development Engineer in Test | Test Manager | Test Lead | Lead Test Engineer | Principal Test Engineer | QA Lead | Quality Assurance Lead | Software Test Lead | Automation Lead | Java | Unit Testing | Contract Testing | REST | API | Java OOP | API Testing | Cucumber | Selenium WebDriver | JSON | Performance Testing | Leadership
FEATURED
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Lead QA Engineer, Commodities Trading, London
Lead QA Engineer, Commodities Trading, London
Harvey Nash
London
£120000.00 - £135000.00 per annum + Extensive Benefits
My Leading Commodities Trading Client are looking for a Lead QA Engineer to Lead on Strategy, Focus and Delivery for a team of 8 UI, DB, API QA's working in a C# / JavaScript Technology Stack having ownership for the Oil and Gas Trading Platform. * Lead Team of 8 QA Engineers across (UI, DB and API Testing), Goal Setting, Direction, Priority / Focus, Delivery etc. * Extensive experience in Automated Testing across UI, DB and API in a Trading Environment.
My Leading Commodities Trading Client are looking for a Lead QA Engineer to Lead on Strategy, Focus and Delivery for a team of 8 UI, DB, API QA's working in a C# / JavaScript Technology Stack having ownership for the Oil and Gas Trading Platform. * Lead Team of 8 QA Engineers across (UI, DB and API Testing), Goal Setting, Direction, Priority / Focus, Delivery etc. * Extensive experience in Automated Testing across UI, DB and API in a Trading Environment.
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Lead QA Engineer, Commodities Trading, London
Lead QA Engineer, Commodities Trading, London
Harvey Nash
London
£120000.00 - £135000.00 per annum + Extensive Benefits
My Leading Commodities Trading Client are looking for a Lead QA Engineer to Lead on Strategy, Focus and Delivery for a team of 8 UI, DB, API QA's working in a C# / JavaScript Technology Stack having ownership for the Oil and Gas Trading Platform. * Lead Team of 8 QA Engineers across (UI, DB and API Testing), Goal Setting, Direction, Priority / Focus, Delivery etc. * Extensive experience in Automated Testing across UI, DB and API in a Trading Environment.
My Leading Commodities Trading Client are looking for a Lead QA Engineer to Lead on Strategy, Focus and Delivery for a team of 8 UI, DB, API QA's working in a C# / JavaScript Technology Stack having ownership for the Oil and Gas Trading Platform. * Lead Team of 8 QA Engineers across (UI, DB and API Testing), Goal Setting, Direction, Priority / Focus, Delivery etc. * Extensive experience in Automated Testing across UI, DB and API in a Trading Environment.
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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
EC1, City of London
Negotiable
API & database experience
API & database experience
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Senior Software Engineer
Senior Software Engineer
Halian Technology Limited
W1, Central London
From £90,000 to £95,000 per annum Plus bonus and benefits
Cloud experience withAWSservices (Lambda, API Gateway, S3, etc.)
Cloud experience withAWSservices (Lambda, API Gateway, S3, etc.)
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Senior Data Engineer
Senior Data Engineer
I3 Resourcing Limited
The City, EC3V 3ND
£80000 - £100000 per annum + + EXCELLENT BONUS + BENEFITS
Extensive experience in AWS services, e.g. EC2, S3, RDS, DynamoDB, Redshift, Lambda, API Gateway
Extensive experience in AWS services, e.g. EC2, S3, RDS, DynamoDB, Redshift, Lambda, API Gateway
Familiarity with workflow automation solutions (UiPath, Power Automate, Zapier, n8n) and API development
Familiarity with workflow automation solutions (UiPath, Power Automate, Zapier, n8n) and API development
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Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
NEW
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Head of Engineering (Hands on)- London Hybrid
Head of Engineering (Hands on)- London Hybrid
Develop
London
£90000 - £120000 per annum + + benefits & stocks
Deliver front-end excellence: Build fast, responsive web apps using Vite, React Query, Context API, and CSS frameworks. * Design for scale: Lead on API design, performance optimisation, and secure, cloud-ready architectures.
Deliver front-end excellence: Build fast, responsive web apps using Vite, React Query, Context API, and CSS frameworks. * Design for scale: Lead on API design, performance optimisation, and secure, cloud-ready architectures.
NEW
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Forward Deployed Engineer
Forward Deployed Engineer
McGregor Boyall Associates Limited
EC1, City of London
£70000 - £90000 per annum
Strong data modelling, pipeline development, and API design experience.
Strong data modelling, pipeline development, and API design experience.
NEW
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Strong foundation in web development, REST API design, and secure best practices
Strong foundation in web development, REST API design, and secure best practices
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Job Title: Solution Architect - Location: Windsor, UK - Work Model: Hybrid (1 day per week in office) Job Type: Contract (Inside IR35) Duration: 6 Months - We are seeking an experienced Solution Architect to join our team in Windsor. You will play a key role in defining, communicating, and implementing strategic technology standards and roadmaps, ensuring robust and scalable solutions for business transformation initiatives. This is a hybrid role requiring one day per week in the office. * Identify, publish, and communicate strategic technology standards, frameworks, principles, and roadmaps to guide technology decisions and leverage efficiency opportunities. * Analyze the impact of implementing new technologies into the IT infrastructure. * Assist Solution Architects, Product Specialists, and Project Managers in matching technology services to specific business servi
Job Title: Solution Architect - Location: Windsor, UK - Work Model: Hybrid (1 day per week in office) Job Type: Contract (Inside IR35) Duration: 6 Months - We are seeking an experienced Solution Architect to join our team in Windsor. You will play a key role in defining, communicating, and implementing strategic technology standards and roadmaps, ensuring robust and scalable solutions for business transformation initiatives. This is a hybrid role requiring one day per week in the office. * Identify, publish, and communicate strategic technology standards, frameworks, principles, and roadmaps to guide technology decisions and leverage efficiency opportunities. * Analyze the impact of implementing new technologies into the IT infrastructure. * Assist Solution Architects, Product Specialists, and Project Managers in matching technology services to specific business servi
NEW
.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
NEW
.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
NEW
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Global Claims, IT Solutions Leader
Global Claims, IT Solutions Leader
MARSH CORPORATE SERVICES LIMITED
The City, EC3R 5BU
Discretionary Bonus, Pension Scheme & Private Healthcare
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
NEWPREMIUM