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22 Contract API jobs in The City, City of London + 20 miles
352 exact matches jobs are outside your preferred location
Working knowledge of APIs, API architecture, and webhooks, with the ability to understand and troubleshoot integrations.
Working knowledge of APIs, API architecture, and webhooks, with the ability to understand and troubleshoot integrations.
Experience in API (REST, GraphQL) design and development
Experience in API (REST, GraphQL) design and development
Working with top developers from around the world, helping to implement Kong Products and Technologies, including our API Gateway, AI Gateway and ServiceMesh solutions - Kong Inc., a leading developer of cloud API technologies, is on a mission to enable companies around the world to become API-first and securely accelerate AI adoption.
Working with top developers from around the world, helping to implement Kong Products and Technologies, including our API Gateway, AI Gateway and ServiceMesh solutions - Kong Inc., a leading developer of cloud API technologies, is on a mission to enable companies around the world to become API-first and securely accelerate AI adoption.
API testing with Postman or similar tools
API testing with Postman or similar tools
API and third-party integrations experience is essential, including writing ICDs. * Integration with REST Api, ActiveMQ, Kafka, SOAP, IBM WebSphere, MSMQ and more.
API and third-party integrations experience is essential, including writing ICDs. * Integration with REST Api, ActiveMQ, Kafka, SOAP, IBM WebSphere, MSMQ and more.
Experience defining product functional specifications including API, CLI and GUI
Experience defining product functional specifications including API, CLI and GUI
You'll be joining the core backend team that underpins every Quidax product from deposits and swaps to merchant payments and our API rails.
You'll be joining the core backend team that underpins every Quidax product from deposits and swaps to merchant payments and our API rails.
Experience with microservice and API-based development, including designing and implementing REST and GraphQL APIs, and understanding API security patterns.
Experience with microservice and API-based development, including designing and implementing REST and GraphQL APIs, and understanding API security patterns.
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RESPONSABILITIES Translate business and technical needs into clear product requirements, including user stories, acceptance criteria, and data schemas; Prioritize data features and deliverables based on impact, effort, and strategic alignment; Define and enforce data quality standards (accuracy, completeness, timeliness) for published data sets; Collaborate with engineering and governance teams on lineage, metadata, access controls, and compliance (e.g., GDPR); Develop and maintain a data-product roadmap with versioning, documentation, and API endpoints; Craft external documentation such as data dictionaries, schema definitions, sample queries, and usage guides; Define and track adoption metrics (API calls, downloads, user feedback); Facilitate agile ceremonies to align teams on data-product goals; Mentor junior product team members o
RESPONSABILITIES Translate business and technical needs into clear product requirements, including user stories, acceptance criteria, and data schemas; Prioritize data features and deliverables based on impact, effort, and strategic alignment; Define and enforce data quality standards (accuracy, completeness, timeliness) for published data sets; Collaborate with engineering and governance teams on lineage, metadata, access controls, and compliance (e.g., GDPR); Develop and maintain a data-product roadmap with versioning, documentation, and API endpoints; Craft external documentation such as data dictionaries, schema definitions, sample queries, and usage guides; Define and track adoption metrics (API calls, downloads, user feedback); Facilitate agile ceremonies to align teams on data-product goals; Mentor junior product team members o
Add support for new/future API/input language features
Add support for new/future API/input language features
Company Description - Founded by experienced entrepreneurs and engineers in 2016, Pismo is a technology company that provides a comprehensive processing platform for banking, card issuing and financial market infrastructure and helps customers innovate and build the next generation of banking and payment solutions. Pismo joined Visa in 2024. Leveraging Visas solutions, our core platform, and an expanding suite of capabilities, Pismo addresses the technological challenges that large banks, marketplaces, and fintech companies face in migrating from legacy systems to more advanced technology in the market. Pismos cloud-based platform empowers firms to build and launch financial products rapidly, scaling as they grow to have a broader audience while keeping high security and availability standards. Pismos 500+ employees are located in more than 10 countries around the wor
Company Description - Founded by experienced entrepreneurs and engineers in 2016, Pismo is a technology company that provides a comprehensive processing platform for banking, card issuing and financial market infrastructure and helps customers innovate and build the next generation of banking and payment solutions. Pismo joined Visa in 2024. Leveraging Visas solutions, our core platform, and an expanding suite of capabilities, Pismo addresses the technological challenges that large banks, marketplaces, and fintech companies face in migrating from legacy systems to more advanced technology in the market. Pismos cloud-based platform empowers firms to build and launch financial products rapidly, scaling as they grow to have a broader audience while keeping high security and availability standards. Pismos 500+ employees are located in more than 10 countries around the wor
SQL, API integration skills, or experience with workflow automation.
SQL, API integration skills, or experience with workflow automation.
Working knowledge of creating data connections - e.g. SQL and relational databases, DataBricks, JSON files, API services, Data Lakes
Working knowledge of creating data connections - e.g. SQL and relational databases, DataBricks, JSON files, API services, Data Lakes
Proficiency in Python (especially API packages), SQL, Power BI, and Power Automate
Proficiency in Python (especially API packages), SQL, Power BI, and Power Automate
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
Oversee API integration strategy, including duplication checks, system alignment, and end-to-end flow * Strong business acumen with a clear understanding of technical API integration principles and tools
Oversee API integration strategy, including duplication checks, system alignment, and end-to-end flow * Strong business acumen with a clear understanding of technical API integration principles and tools
Knowledge of Salesforces API
Knowledge of Salesforces API
Iterable or similar ESP (Advantageous): Strong knowledge of data feeds, journey building, custom events, API integrations, and dynamic content blocks.
Iterable or similar ESP (Advantageous): Strong knowledge of data feeds, journey building, custom events, API integrations, and dynamic content blocks.
Expertise in React, Hooks, Context API, TypeScript, and related frontend tools.
Expertise in React, Hooks, Context API, TypeScript, and related frontend tools.
Software Engineer, Data – Query Intelligence & Infrastructure - 6 Month Contract
Software Engineer, Data – Query Intelligence & Infrastructure - 6 Month Contract
Benchsci U.K. Limited
London
Competitive
Your work will involve API development, performance optimization, and maintaining high-performance access to large, interconnected datasets.
Your work will involve API development, performance optimization, and maintaining high-performance access to large, interconnected datasets.
Play a key role in the Practice Management team contributing to frontend, API and infrastructure tasks. * You have experience building and architecting RESTful and GraphQL APIs as well as designing and implementing API integrations.
Play a key role in the Practice Management team contributing to frontend, API and infrastructure tasks. * You have experience building and architecting RESTful and GraphQL APIs as well as designing and implementing API integrations.
As a machine learning engineer, your main responsibility is to conduct the development and productionisation of ML and NLP-based features for CUBEs products - a SaaS Platform (RegPlatform) and an API (RegConnect).
As a machine learning engineer, your main responsibility is to conduct the development and productionisation of ML and NLP-based features for CUBEs products - a SaaS Platform (RegPlatform) and an API (RegConnect).
Integrate messaging campaigns into our existing lifecycle stack (e.g., Braze, WhatsApp Business API). * Technical fluency with tools such as Braze, Twilio, or WhatsApp Business API, and a working knowledge of customer data flows.
Integrate messaging campaigns into our existing lifecycle stack (e.g., Braze, WhatsApp Business API). * Technical fluency with tools such as Braze, Twilio, or WhatsApp Business API, and a working knowledge of customer data flows.
[Nice to have] Experience in fintech, payments, or API-first companies
[Nice to have] Experience in fintech, payments, or API-first companies
Data Access and Availability: Control and manage access to data for internal and external stakeholders, working with our tech and API teams to ensure seamless data transfer.
Data Access and Availability: Control and manage access to data for internal and external stakeholders, working with our tech and API teams to ensure seamless data transfer.