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40 Contract API jobs in Welwyn Garden City + 20 miles
532 exact matches jobs are outside your preferred location
Experience interacting with a variety of API technologies, such as REST, JSON and XML * Experience working with AWS, using services such as ECS, S3 and API Gateway (Optional)
Experience interacting with a variety of API technologies, such as REST, JSON and XML * Experience working with AWS, using services such as ECS, S3 and API Gateway (Optional)
Knowledge of API design principles, patterns (SOAP, REST), data formats (JSON, XML), and hands-on experience executing APIs through scripting.
Knowledge of API design principles, patterns (SOAP, REST), data formats (JSON, XML), and hands-on experience executing APIs through scripting.
Implement and optimize robust API integrations (REST and GraphQL) with backend systems. * Reliable delivery of API-driven features that meet product requirements. * Demonstrated experience building and maintaining API integrations (REST, GraphQL, or gRPC).
Implement and optimize robust API integrations (REST and GraphQL) with backend systems. * Reliable delivery of API-driven features that meet product requirements. * Demonstrated experience building and maintaining API integrations (REST, GraphQL, or gRPC).
Language: Java 8/21 Frameworks: Spring Boot (Tomcat, Netty), Spring Data, Spring Cloud Architecture: Microservices, REST API, Message Queues, WebSocket Database: MySQL, MyBatis, MongoDB Caching: Redis/ValKey (AWS ElastiCache), ElasticSearch Message Queue: RocketMQ Cloud: Kubernetes, AWS Monitoring: Grafana, Prometheus, Loki, Tempo, AWS CloudWatch, OpenTelemetry CI/CD: Jenkins, ArgoCD What you'll be doing
Language: Java 8/21 Frameworks: Spring Boot (Tomcat, Netty), Spring Data, Spring Cloud Architecture: Microservices, REST API, Message Queues, WebSocket Database: MySQL, MyBatis, MongoDB Caching: Redis/ValKey (AWS ElastiCache), ElasticSearch Message Queue: RocketMQ Cloud: Kubernetes, AWS Monitoring: Grafana, Prometheus, Loki, Tempo, AWS CloudWatch, OpenTelemetry CI/CD: Jenkins, ArgoCD What you'll be doing
Advanced understanding of good practice API development, integration, and testing (e.g. RESTful services, GraphQL). * Experience with both front-end (e.g. React, TypeScript) and back-end (.NET C#, ASP.NET) development, especially related to API consumption good practices such as schema validation, or event-driven architectures (e.g. webhooks).
Advanced understanding of good practice API development, integration, and testing (e.g. RESTful services, GraphQL). * Experience with both front-end (e.g. React, TypeScript) and back-end (.NET C#, ASP.NET) development, especially related to API consumption good practices such as schema validation, or event-driven architectures (e.g. webhooks).
Develop data monetization strategies, including internal value creation (e.g., operational efficiency, personalization) and external revenue models (e.g., data-as-a-service, API products).
Develop data monetization strategies, including internal value creation (e.g., operational efficiency, personalization) and external revenue models (e.g., data-as-a-service, API products).
Ensure the quality of our web, mobile and API software * Proven, extensive experience testing web, mobile UI/UX, and API endpoints. * Practical experience in automated UI and API testing (e.g., using frameworks like Cypress, Playwright, or Postman).
Ensure the quality of our web, mobile and API software * Proven, extensive experience testing web, mobile UI/UX, and API endpoints. * Practical experience in automated UI and API testing (e.g., using frameworks like Cypress, Playwright, or Postman).
Create and maintain API and data integrations between ServiceNow and other services.
Create and maintain API and data integrations between ServiceNow and other services.
This senior role focuses on establishing and evolving best practices in QA engineering, with particular emphasis on automated testing for web, API, and desktop applications. * Lead the development and maintenance of automated tests for web, API, and desktop applications - o API: RestSharp (or similar tools)
This senior role focuses on establishing and evolving best practices in QA engineering, with particular emphasis on automated testing for web, API, and desktop applications. * Lead the development and maintenance of automated tests for web, API, and desktop applications - o API: RestSharp (or similar tools)
API & Integration Development Build secure, scalable APIs to connect EnvisionOS with platforms like ServiceNow, Snowflake, and monitoring systems. * Proven experience with API development (REST, GraphQL) and frameworks like Flask, FastAPI, or Spring.
API & Integration Development Build secure, scalable APIs to connect EnvisionOS with platforms like ServiceNow, Snowflake, and monitoring systems. * Proven experience with API development (REST, GraphQL) and frameworks like Flask, FastAPI, or Spring.
Familiarity with application programming interfaces (API)
Familiarity with application programming interfaces (API)
SharePoint CSOM API * SharePoint Rest API v1 & 2
SharePoint CSOM API * SharePoint Rest API v1 & 2
Institutional User Experience (UX/API) This includes driving excellence across both the Web UI and API architecture, ensuring resilience, scalability, and ease of integration for institutional clients. * Proven ability to translate complex financial and security requirements into intuitive, compliance-aware user journeys for web platforms and B2B API integrations.
Institutional User Experience (UX/API) This includes driving excellence across both the Web UI and API architecture, ensuring resilience, scalability, and ease of integration for institutional clients. * Proven ability to translate complex financial and security requirements into intuitive, compliance-aware user journeys for web platforms and B2B API integrations.
AWS API Gateway
AWS API Gateway
In depth experience with Vue.js, React or other modern JavaScript frameworks, with expertise in GraphQL for API integration and data management
In depth experience with Vue.js, React or other modern JavaScript frameworks, with expertise in GraphQL for API integration and data management
Want a 3D Career? Join Norgine. At Norgine, our colleagues Dare themselves to be different and try new things, Drive to achieve their goals and beyond, and Develop themselves and their community. We call it the 3D career at Norgine and it offers you a fully-rounded experience with no limits. Bring everything about yourself that youre proud of, whether thats your passion for making a difference, focus on others well-being, or intellectual curiosity to unleash in a fast-paced environment and supportive community. In return, get a sense of belonging, a long-term career with ongoing development and upskilling, and a company that cares about peoples wellness as much as you do. Norgine: Transforming Healthcare, Backed by Over a Century of Expertise. We have an exciting opportunity for an Enterprise Architect to join Norgine.
Want a 3D Career? Join Norgine. At Norgine, our colleagues Dare themselves to be different and try new things, Drive to achieve their goals and beyond, and Develop themselves and their community. We call it the 3D career at Norgine and it offers you a fully-rounded experience with no limits. Bring everything about yourself that youre proud of, whether thats your passion for making a difference, focus on others well-being, or intellectual curiosity to unleash in a fast-paced environment and supportive community. In return, get a sense of belonging, a long-term career with ongoing development and upskilling, and a company that cares about peoples wellness as much as you do. Norgine: Transforming Healthcare, Backed by Over a Century of Expertise. We have an exciting opportunity for an Enterprise Architect to join Norgine.
Crawley, United Kingdom - We dont just build technology. We build hope f or everyone dealing with cancer. Are you passionate about building software that makes a real difference? At Elekta, were looking for a Senior Software Development Engineer to help drive innovation in our Radiation Therapy Treatment systems. Youll be developing cutting-edge workflow, delivery, and imaging software for medical devicesworking within a safety-critical environment where software quality is paramount and embedded into our CI/CD pipelines. Guided by system architecture and technical leadership, youll collaborate in agile teams to deliver impactful solutions that improve patient outcomes worldwide. * Define, design, develop and maintain application components, services and APIs on the Elekta Domain-based service-oriented platform, hosted on containers.
Crawley, United Kingdom - We dont just build technology. We build hope f or everyone dealing with cancer. Are you passionate about building software that makes a real difference? At Elekta, were looking for a Senior Software Development Engineer to help drive innovation in our Radiation Therapy Treatment systems. Youll be developing cutting-edge workflow, delivery, and imaging software for medical devicesworking within a safety-critical environment where software quality is paramount and embedded into our CI/CD pipelines. Guided by system architecture and technical leadership, youll collaborate in agile teams to deliver impactful solutions that improve patient outcomes worldwide. * Define, design, develop and maintain application components, services and APIs on the Elekta Domain-based service-oriented platform, hosted on containers.
Company Description - Bicycle Therapeutics is a clinical-stage pharmaceutical company developing a novel class of medicines, referred to as Bicycle molecules, for diseases that are underserved by existing therapeutics. Bicycle molecules are fully synthetic short peptides constrained with small molecule scaffolds to form two loops that stabilize their structural geometry. This constraint facilitates target binding with high affinity and selectivity, making Bicycle molecules attractive candidates for drug development. The company is evaluating zelenectide pevedotin (formerly BT8009), a Bicycle Drug Conjugate (BDC) targeting Nectin-4, a well-validated tumor antigen; BT5528, a BDC molecule targeting EphA2, a historically undruggable target; and BT7480, a Bicycle Tumor-Targeted Immune Cell Agonist (Bicycle TICA) targeting Nectin-4 and agonizing CD137, in company-sponsored
Company Description - Bicycle Therapeutics is a clinical-stage pharmaceutical company developing a novel class of medicines, referred to as Bicycle molecules, for diseases that are underserved by existing therapeutics. Bicycle molecules are fully synthetic short peptides constrained with small molecule scaffolds to form two loops that stabilize their structural geometry. This constraint facilitates target binding with high affinity and selectivity, making Bicycle molecules attractive candidates for drug development. The company is evaluating zelenectide pevedotin (formerly BT8009), a Bicycle Drug Conjugate (BDC) targeting Nectin-4, a well-validated tumor antigen; BT5528, a BDC molecule targeting EphA2, a historically undruggable target; and BT7480, a Bicycle Tumor-Targeted Immune Cell Agonist (Bicycle TICA) targeting Nectin-4 and agonizing CD137, in company-sponsored
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Role: Java Engineer - Native Apps - Location: London office / Hybrid (2 days per week in the office) Reporting to: Engineering Manager - Rightmoves Native Apps are central to how millions of people find their next home. We are investing in creating faster, smarter, and more personalised mobile experiences, built on modern technology, powered by data, and driven by teams who care deeply about quality and collaboration. As part of this transformation, the Native Apps engineering group is becoming a space for experimentation and innovation, where backend systems and mobile experiences come together more seamlessly than ever before. Joining now means helping to shape how we design, build, and scale the technology that powers the UKs most trusted property platform, while contributing to an inclusive engineering culture that values learning, creativity, and impact. The Role
Role: Java Engineer - Native Apps - Location: London office / Hybrid (2 days per week in the office) Reporting to: Engineering Manager - Rightmoves Native Apps are central to how millions of people find their next home. We are investing in creating faster, smarter, and more personalised mobile experiences, built on modern technology, powered by data, and driven by teams who care deeply about quality and collaboration. As part of this transformation, the Native Apps engineering group is becoming a space for experimentation and innovation, where backend systems and mobile experiences come together more seamlessly than ever before. Joining now means helping to shape how we design, build, and scale the technology that powers the UKs most trusted property platform, while contributing to an inclusive engineering culture that values learning, creativity, and impact. The Role
Remote (UK, Netherlands, Germany) About Us - Studio 397 and Motorsport Games are the video game developer and publishers of Le Mans Ultimate the Official Video Game of the FIA World Endurance Championship and 24 Hours of Le Mans available now on Steam. We also run the popular rFactor 2 simulation title and have created an online matchmaking and player management system for racing games called RaceControl. We are a close-knit, passionate team committed to creating the most realistic motorsport simulations in the world. Our team works remotely, primarily across Europe, and we pride ourselves on technical excellence, collaboration, and innovation. The Role - We are seeking a Senior Console Developer to play a key role in developing the next generation of our technology for modern console platforms (PlayStation, Xbox).
Remote (UK, Netherlands, Germany) About Us - Studio 397 and Motorsport Games are the video game developer and publishers of Le Mans Ultimate the Official Video Game of the FIA World Endurance Championship and 24 Hours of Le Mans available now on Steam. We also run the popular rFactor 2 simulation title and have created an online matchmaking and player management system for racing games called RaceControl. We are a close-knit, passionate team committed to creating the most realistic motorsport simulations in the world. Our team works remotely, primarily across Europe, and we pride ourselves on technical excellence, collaboration, and innovation. The Role - We are seeking a Senior Console Developer to play a key role in developing the next generation of our technology for modern console platforms (PlayStation, Xbox).
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Our world is transforming, and PTC is leading the way. Our software brings the physical and digital worlds together, enabling companies to improve operations, create better products, and empower people in all aspects of their business. Our people make all the difference in our success. Today, we are a global team of nearly 7,000 and our main objective is to create opportunities for our team members to explore, learn, and grow all while seeing their ideas come to life and celebrating the differences that make us who we are and the work we do possible. Job Description - Position Summary - The Principal Software Engineer is a senior technical engineer who blends architectural ownership with direct engineering. They drive the design and optimization of complex CAD subsystems, act as a mentor to peers, and ensure solutions scale and meet customer needs.
Our world is transforming, and PTC is leading the way. Our software brings the physical and digital worlds together, enabling companies to improve operations, create better products, and empower people in all aspects of their business. Our people make all the difference in our success. Today, we are a global team of nearly 7,000 and our main objective is to create opportunities for our team members to explore, learn, and grow all while seeing their ideas come to life and celebrating the differences that make us who we are and the work we do possible. Job Description - Position Summary - The Principal Software Engineer is a senior technical engineer who blends architectural ownership with direct engineering. They drive the design and optimization of complex CAD subsystems, act as a mentor to peers, and ensure solutions scale and meet customer needs.
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Discipline: Standard - Job type: Fixed Term - Correla are looking for a **Software Engineer FTC for 12 months** to work as part of the SaaS team. Salary: circa £60,000 (advertised salary achievable for a candidate fulfilling all role criteria) Job Type: 12-month Fixed Term Contract - About us - In March 2021, Correla was created, as an independently owned business to bring in private investment to fuel innovation in the centre of the energy market and beyond. Correla is derived from correlation, because were all about exploring and enhancing relationships between data, people, and processes . Our SaaS products and Managed Service solutions combine to power industry innovation, simplify an increasingly complex market, and deliver cost and operational efficiencies. Our goal is to support industry transformation, to move to a net-zero future and to positively impact the
Discipline: Standard - Job type: Fixed Term - Correla are looking for a **Software Engineer FTC for 12 months** to work as part of the SaaS team. Salary: circa £60,000 (advertised salary achievable for a candidate fulfilling all role criteria) Job Type: 12-month Fixed Term Contract - About us - In March 2021, Correla was created, as an independently owned business to bring in private investment to fuel innovation in the centre of the energy market and beyond. Correla is derived from correlation, because were all about exploring and enhancing relationships between data, people, and processes . Our SaaS products and Managed Service solutions combine to power industry innovation, simplify an increasingly complex market, and deliver cost and operational efficiencies. Our goal is to support industry transformation, to move to a net-zero future and to positively impact the
Description - Location: Hybrid (minimum 3 days per week required in either our Poole or London office). Diversity matters We are building a brand that represents the people of the world. Its what you do that counts, and we are always looking to expand perspectives and voices to shape our future. We see you, we celebrate you, we want you! Who we are - You might know us as the inventors of the bath bomb, but theres more to this great-smelling, partly employee-owned, family-run company than pioneering cosmetics. We believe our business should put more back into the world than it takes and demonstrate that capitalism can be a force for good. The Living Wage Foundations statement 'a hard day's work deserves a fair day's pay' is one that we are proud to commit to in the UK. As an accredited Living Wage employer, we put our people first and fight cruel practices like animal
Description - Location: Hybrid (minimum 3 days per week required in either our Poole or London office). Diversity matters We are building a brand that represents the people of the world. Its what you do that counts, and we are always looking to expand perspectives and voices to shape our future. We see you, we celebrate you, we want you! Who we are - You might know us as the inventors of the bath bomb, but theres more to this great-smelling, partly employee-owned, family-run company than pioneering cosmetics. We believe our business should put more back into the world than it takes and demonstrate that capitalism can be a force for good. The Living Wage Foundations statement 'a hard day's work deserves a fair day's pay' is one that we are proud to commit to in the UK. As an accredited Living Wage employer, we put our people first and fight cruel practices like animal
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving.
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving.
Dataiku is The Universal AI Platform, giving organizations control over their AI talent, processes, and technologies to unleash the creation of analytics, models, and agents. Providing no-, low-, and full-code capabilities, Dataiku meets teams where they are today, allowing them to begin building with AI using their existing skills and knowledge. Why Engineering at Dataiku? Dataikus on-premise, cloud, or SaaS-deployed platform connects many data science technologies, and our technology stack reflects our commitment to quality and innovation. We integrate the best of data and AI tech, selecting tools that truly enhance our product. From the latest LLMs to our dedication to open source communities, you'll work with a dynamic range of technologies and contribute to the collective knowledge of global tech innovators.
Dataiku is The Universal AI Platform, giving organizations control over their AI talent, processes, and technologies to unleash the creation of analytics, models, and agents. Providing no-, low-, and full-code capabilities, Dataiku meets teams where they are today, allowing them to begin building with AI using their existing skills and knowledge. Why Engineering at Dataiku? Dataikus on-premise, cloud, or SaaS-deployed platform connects many data science technologies, and our technology stack reflects our commitment to quality and innovation. We integrate the best of data and AI tech, selecting tools that truly enhance our product. From the latest LLMs to our dedication to open source communities, you'll work with a dynamic range of technologies and contribute to the collective knowledge of global tech innovators.