Date posted
Commute time
Locations
Type of Company
Job types
Salaries
Locations
Locations
Salaries
Date posted
Type of Company
Job types
Locations
29 Contract API jobs in Welwyn Garden City + 20 miles
318 exact matches jobs are outside your preferred location
The responsibilities are cross-functional, ranging from infrastructure, API design & coding all the way to client-side integration(we are using Golang).
The responsibilities are cross-functional, ranging from infrastructure, API design & coding all the way to client-side integration(we are using Golang).
Have experience in the related technologies demanded by and commonly implemented with Oracle solutions including major cloud platforms IaaS & PaaS, Identity and Access Management, data platforms, Service Management, automation solutions, IoT, Operational Technology, API management.
Have experience in the related technologies demanded by and commonly implemented with Oracle solutions including major cloud platforms IaaS & PaaS, Identity and Access Management, data platforms, Service Management, automation solutions, IoT, Operational Technology, API management.
Experience in the related technologies demanded by and commonly implemented with Oracle solutions including major cloud platforms IaaS & PaaS, Identity and Access Management, data platforms, Service Management, automation solutions, IoT, Operational Technology, API management.
Experience in the related technologies demanded by and commonly implemented with Oracle solutions including major cloud platforms IaaS & PaaS, Identity and Access Management, data platforms, Service Management, automation solutions, IoT, Operational Technology, API management.
3+ years of full-time work experience in API development.
3+ years of full-time work experience in API development.
NEW
Familiarity with API-based integrations and middleware platforms including SFTP file transfers.
Familiarity with API-based integrations and middleware platforms including SFTP file transfers.
NEW
Experienced in managing complex databases and developing API interfaces
Experienced in managing complex databases and developing API interfaces
NEW
M365/Azure API integrations.
M365/Azure API integrations.
Experience with REST API development and microservices architectures
Experience with REST API development and microservices architectures
Upvests Investment API is easy to integrate so that fintechs and enterprises alike can save resources and fully focus on their core business.? Our Marketing team ensures Upvests Investment API is widely recognised as the best on the market. * 5+ years of product marketing experience in B2B SaaS, ideally within fintech, investments, or API-driven infrastructure.
Upvests Investment API is easy to integrate so that fintechs and enterprises alike can save resources and fully focus on their core business.? Our Marketing team ensures Upvests Investment API is widely recognised as the best on the market. * 5+ years of product marketing experience in B2B SaaS, ideally within fintech, investments, or API-driven infrastructure.
Technology Stack Proficiency : Experienced in Microsoft technologies (C#, ASP.NET Core, Web API), JavaScript (AngularJS or React), and Azure Microservices.
Technology Stack Proficiency : Experienced in Microsoft technologies (C#, ASP.NET Core, Web API), JavaScript (AngularJS or React), and Azure Microservices.
NEW
Implement and maintain Azure Firewall, API Management (APIM), Databases, Service Bus, and Event Grid.
Implement and maintain Azure Firewall, API Management (APIM), Databases, Service Bus, and Event Grid.
Understanding and/or experience in managing API-based software businesses
Understanding and/or experience in managing API-based software businesses
Youll join the team responsible for running the core infrastructure that supports products like ChatGPT and the API.
Youll join the team responsible for running the core infrastructure that supports products like ChatGPT and the API.
Design, build, and operate Python/FastAPI-based API services deployed on AWS ECS * Own API design, performance optimization, security, and observability * APIs: REST API design, performance optimization, security, observability
Design, build, and operate Python/FastAPI-based API services deployed on AWS ECS * Own API design, performance optimization, security, and observability * APIs: REST API design, performance optimization, security, observability
Extensive ability to read and understand and compile technical documentation (API documentation, ERD, functional specifications etc).
Extensive ability to read and understand and compile technical documentation (API documentation, ERD, functional specifications etc).
NEW
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
The Runa API empowers thousands of businesses to make payments to 5 billion+ consumers in 190+ countries instantly to cards, wallets, bank accounts and gift cards.
NEW
Software Engineer - (Machine Learning Experience a plus) - hybrid
Software Engineer - (Machine Learning Experience a plus) - hybrid
FactSet Europe Ltd
London
Competitive
Proficiency with API design
Proficiency with API design
Uphold high standards for our uptime and latency requirements while not sacrificing the veracity of API responses
Uphold high standards for our uptime and latency requirements while not sacrificing the veracity of API responses
We are building the first European Investment API that empowers businesses to offer seamless investment experiences to their users. We are looking for a full-time Head of Engineering to help us build a securities API for financial institutions, the first API of that kind in Europe. These teams are responsible for critical domains such as Orders, Trading Partner integrations, Position, and Wealth Management, all of which are essential for Upvests Investment API. The Brokerage Tribe plays a crucial role in the Investment API Platform, overseeing a wide range of user journey aspects. * Assume ownership of business-critical components within the Investment API, influencing its roadmap and delivering strategic impact to establish Upvest as a reliable partner. * Experience
We are building the first European Investment API that empowers businesses to offer seamless investment experiences to their users. We are looking for a full-time Head of Engineering to help us build a securities API for financial institutions, the first API of that kind in Europe. These teams are responsible for critical domains such as Orders, Trading Partner integrations, Position, and Wealth Management, all of which are essential for Upvests Investment API. The Brokerage Tribe plays a crucial role in the Investment API Platform, overseeing a wide range of user journey aspects. * Assume ownership of business-critical components within the Investment API, influencing its roadmap and delivering strategic impact to establish Upvest as a reliable partner. * Experience
NEW
Collaborate with ML Engineering to enhance model sophistication, ensuring seamless integration with Radar API and establishing robust MLOps pipelines for scalable deployment.
Collaborate with ML Engineering to enhance model sophistication, ensuring seamless integration with Radar API and establishing robust MLOps pipelines for scalable deployment.
Frontend and API testing,
Frontend and API testing,
Date: 30 Sept 2025 - Location: London, GB, EC2V 7AD - Company: Paysafe - Paysafe is a leading payments platform with an extensive track record of serving merchants and consumers in the global entertainment sectors. Its core purpose is to enable businesses and consumers to connect and transact seamlessly through industry-leading capabilities in payment processing, digital wallet, and online cash solutions. With 29 years of online payment experience, an annualized transactional volume of $152 billion in 2024, and approximately 3,300 employees located in 12+ countries, Paysafe connects businesses and consumers across 260 payment types in 48 currencies around the world. Delivered through an integrated platform, Paysafe solutions are geared toward mobile-initiated transactions, real-time analytics and the convergence between brick-and-mortar and online payments.
Date: 30 Sept 2025 - Location: London, GB, EC2V 7AD - Company: Paysafe - Paysafe is a leading payments platform with an extensive track record of serving merchants and consumers in the global entertainment sectors. Its core purpose is to enable businesses and consumers to connect and transact seamlessly through industry-leading capabilities in payment processing, digital wallet, and online cash solutions. With 29 years of online payment experience, an annualized transactional volume of $152 billion in 2024, and approximately 3,300 employees located in 12+ countries, Paysafe connects businesses and consumers across 260 payment types in 48 currencies around the world. Delivered through an integrated platform, Paysafe solutions are geared toward mobile-initiated transactions, real-time analytics and the convergence between brick-and-mortar and online payments.
Manager Data Engineering
Manager Data Engineering
LEXISNEXIS RISK SOLUTIONS UK LIMITED T/a LexisNexis Risk Solutions Group
London
Competitive
Experience with API design, integration, and management.
Experience with API design, integration, and management.
AWS API Gateway
AWS API Gateway
Capable of diagnosing and resolving tracking, data, and audience issues, including pixel implementation, UTM structure, and conversion API setup.
Capable of diagnosing and resolving tracking, data, and audience issues, including pixel implementation, UTM structure, and conversion API setup.