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- The City, City (EC3)
- Southwark
- The City, City (EC4)
- West Fields
- Euston
- White Hill
- Canary Wharf
- Datchet Common
- Frimley
- Holborn
- City of London
- South East London
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- Reading
- Cambridge
- South West London
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- Berkshire
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86 API jobs in Charing Cross, Central London + 20 miles
232 exact matches jobs are outside your preferred location
Were Gravita: the accountants fuelling ambitious businesses. Were a full service, tech-enabled firm, working with entrepreneurs and businesses to help them achieve their goals, and make an impact in the world. Were growing fast and are bringing like-minded advisors together to form a full-service tech-enabled accounting partner for thousands of SMEs. Our team use their incredible expertise alongside intuitive technology to help businesses and entrepreneurs plan better and grow faster. Our mission is to become the UKs leading tech-enabled accounting firm for SMEs. We have ambitious goals and our high-calibre team work hard to achieve them. We are one team with one agenda, working collaboratively in a respectful environment to deliver a great service to our clients. So if you join us, youll not only be working on exciting client challenges, youll also be helping us shap
Were Gravita: the accountants fuelling ambitious businesses. Were a full service, tech-enabled firm, working with entrepreneurs and businesses to help them achieve their goals, and make an impact in the world. Were growing fast and are bringing like-minded advisors together to form a full-service tech-enabled accounting partner for thousands of SMEs. Our team use their incredible expertise alongside intuitive technology to help businesses and entrepreneurs plan better and grow faster. Our mission is to become the UKs leading tech-enabled accounting firm for SMEs. We have ambitious goals and our high-calibre team work hard to achieve them. We are one team with one agenda, working collaboratively in a respectful environment to deliver a great service to our clients. So if you join us, youll not only be working on exciting client challenges, youll also be helping us shap
As a Data Analyst, specialising in Marketing you will be responsible for collecting, analysing, and interpreting marketing data to support decision-making across campaigns, channels, and customer segments. This role requires strong technical skills in Python and SQL to automate data pipelines, build analytical models, and generate actionable insights that drive growth, optimize ROI, and improve marketing performance. While the role is primarily focused around Marketing Data, there will be scope for involvement in wider Data Projects around Trading, Client Analytics, Sales, Compliance, Risk. Who we are - We are Trade Nation. We help our customers power up their trading through killer insights, transparent costs, and fairer ways to trade. Were innovators, and proud of it. And weve grown a lot in our decade as a market-leading low-cost trading powerhouse.
As a Data Analyst, specialising in Marketing you will be responsible for collecting, analysing, and interpreting marketing data to support decision-making across campaigns, channels, and customer segments. This role requires strong technical skills in Python and SQL to automate data pipelines, build analytical models, and generate actionable insights that drive growth, optimize ROI, and improve marketing performance. While the role is primarily focused around Marketing Data, there will be scope for involvement in wider Data Projects around Trading, Client Analytics, Sales, Compliance, Risk. Who we are - We are Trade Nation. We help our customers power up their trading through killer insights, transparent costs, and fairer ways to trade. Were innovators, and proud of it. And weve grown a lot in our decade as a market-leading low-cost trading powerhouse.
At Bluecrest, were more than a health assessment provider - were the health intelligence company. Since our founding in 2012, weve been on a mission to make high-quality, affordable health monitoring accessible to everyone across the UK and Ireland. Serving both individual customers and businesses, we empower people to take control of their wellbeing through early detection and long-term health insights. Our purpose is simple yet powerful: to give everyone confidence in their health. By 2028, our vision is to be the UKs leading health intelligence company, delivering vital health insights to over a million people every single day. Were proud to help people live healthier for longer, and we do it by making personal health monitoring easy, affordable, and impactful. Join us in shaping the future of health intelligence, where your work makes a real difference, every day.
At Bluecrest, were more than a health assessment provider - were the health intelligence company. Since our founding in 2012, weve been on a mission to make high-quality, affordable health monitoring accessible to everyone across the UK and Ireland. Serving both individual customers and businesses, we empower people to take control of their wellbeing through early detection and long-term health insights. Our purpose is simple yet powerful: to give everyone confidence in their health. By 2028, our vision is to be the UKs leading health intelligence company, delivering vital health insights to over a million people every single day. Were proud to help people live healthier for longer, and we do it by making personal health monitoring easy, affordable, and impactful. Join us in shaping the future of health intelligence, where your work makes a real difference, every day.
Job title: Senior Oracle Fusion Analyst - Location: London, Manchester, or Dublin - hybrid working arrangements with 2/3 days per week in the office. Package: Base salary, Company Bonus Plan, Pension plan, Private Medical, Generous leave allowance, Life Insurance, Income Protection. About iNIZIO - At Inizio, we're a global team driven by a shared purpose: to reimagine health. Formed in 2022 through the coming together of Ashfield and Huntsworth, we unite decades of experience with cutting-edge capabilities to deliver impactful solutions across the commercialization journey - from discovery to post-launch. Our global network of over 10,000 experts operates across 50 countries, supporting clients with strategic insight, medical excellence, creative engagement, and real-world delivery. We work with the world's leading health and life sciences businesses to solve complex
Job title: Senior Oracle Fusion Analyst - Location: London, Manchester, or Dublin - hybrid working arrangements with 2/3 days per week in the office. Package: Base salary, Company Bonus Plan, Pension plan, Private Medical, Generous leave allowance, Life Insurance, Income Protection. About iNIZIO - At Inizio, we're a global team driven by a shared purpose: to reimagine health. Formed in 2022 through the coming together of Ashfield and Huntsworth, we unite decades of experience with cutting-edge capabilities to deliver impactful solutions across the commercialization journey - from discovery to post-launch. Our global network of over 10,000 experts operates across 50 countries, supporting clients with strategic insight, medical excellence, creative engagement, and real-world delivery. We work with the world's leading health and life sciences businesses to solve complex
About us - At Xelix, we work with some of the worlds largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows. Xelix is a fast-paced scale-up - things move fast and expectations are high. We raised our Series B with Insight Partners in June 2025 and are expanding aggressively, whilst remaining profitable. We have over 100 talented people pulling together to achieve our goals. Everyone is trusted to take ownership, move fast and have a meaningful impact. We prioritise personal and professional growth, keep things fun & we love to celebrate a milestone together. In this role youll grow, be challenged and help shape the future of Xelix. If youre excited about building something special with us, wed love to hear from you. About the
About us - At Xelix, we work with some of the worlds largest companies to automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate - moving from manual processes to automated, intelligent workflows. Xelix is a fast-paced scale-up - things move fast and expectations are high. We raised our Series B with Insight Partners in June 2025 and are expanding aggressively, whilst remaining profitable. We have over 100 talented people pulling together to achieve our goals. Everyone is trusted to take ownership, move fast and have a meaningful impact. We prioritise personal and professional growth, keep things fun & we love to celebrate a milestone together. In this role youll grow, be challenged and help shape the future of Xelix. If youre excited about building something special with us, wed love to hear from you. About the
Department: Technology Team: AI Location: London with hybrid ways of working Position type: Short Term Contract (Inside IR35) until the end of Dec 2026 What the hiring manager says - As an AI Data Engineer, youll be at the heart of our efforts to build open telco models and advance AI in the telecom sector. This is a unique opportunity to work with cutting-edge data engineering pipelines, collaborate with academic and industry partners, and contribute to the development of synthetic data and knowledge resources that will shape the future of telecom AI. About the Team Youll join a dynamic, cross-functional team dedicated to advancing AI capabilities in the telecom sector. Our team is growing rapidly, with a culture of collaboration and technical excellence. We value curiosity, initiative, and a drive to set new benchmarks for the industry.
Department: Technology Team: AI Location: London with hybrid ways of working Position type: Short Term Contract (Inside IR35) until the end of Dec 2026 What the hiring manager says - As an AI Data Engineer, youll be at the heart of our efforts to build open telco models and advance AI in the telecom sector. This is a unique opportunity to work with cutting-edge data engineering pipelines, collaborate with academic and industry partners, and contribute to the development of synthetic data and knowledge resources that will shape the future of telecom AI. About the Team Youll join a dynamic, cross-functional team dedicated to advancing AI capabilities in the telecom sector. Our team is growing rapidly, with a culture of collaboration and technical excellence. We value curiosity, initiative, and a drive to set new benchmarks for the industry.
Provide expertise in the planning, constructing and execution of test scripts from the initial stages of the project until the implementation of the product (Web, Mobile, and API)
Provide expertise in the planning, constructing and execution of test scripts from the initial stages of the project until the implementation of the product (Web, Mobile, and API)
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SharePoint CSOM API
SharePoint CSOM API
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At least 2 years as an SA or at least 4 years in a similar customer-facing role, for example as a technical consultant, solution engineer or implementation engineer at an API-first (REST, GraphQL) SaaS company.
At least 2 years as an SA or at least 4 years in a similar customer-facing role, for example as a technical consultant, solution engineer or implementation engineer at an API-first (REST, GraphQL) SaaS company.
Familiarity with API testing and integration diagnostics
Familiarity with API testing and integration diagnostics
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M365/Azure API integrations.
M365/Azure API integrations.
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Oversee API and UI automation using tools like ReadyAPI, SpecFlow, and TestComplete. * Expertise with ReadAPI, SpecFlow, and TestComplete for API automation.
Oversee API and UI automation using tools like ReadyAPI, SpecFlow, and TestComplete. * Expertise with ReadAPI, SpecFlow, and TestComplete for API automation.
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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.
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.
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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
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
You possess a strong understanding of cloud computing, microservices, API design, and event-driven architectures.
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Modern tech stack experience - Demonstrable experience with cloud platforms (preferably AWS), containerisation (Docker, Kubernetes), and API design (gRPC, REST).
Modern tech stack experience - Demonstrable experience with cloud platforms (preferably AWS), containerisation (Docker, Kubernetes), and API design (gRPC, REST).
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Join NVIDIA's DGX Cloud Kubernetes API Services team and be at the forefront of building GPU-accelerated Kubernetes clusters supporting NVIDIA AI, robotics, and scientific computing projects. As an API Services Software Engineer, you will work across the stack with partner teams to bring NVIDIA's GPUs to life in a cloud or on-prem environment, ensuring end-to-end performance across compute, storage, and networking. An API Services engineer is above all responsible for ensuring a good customer and developer experience on the DGX Cloud Kubernetes Platform, working with our Runtime and Cluster Architecture teams and more to be the voice of the customer. We serve both customers looking to access their GPU compute via Kubernetes for whatever workloads they wish, as well as developers looking to use our API
Join NVIDIA's DGX Cloud Kubernetes API Services team and be at the forefront of building GPU-accelerated Kubernetes clusters supporting NVIDIA AI, robotics, and scientific computing projects. As an API Services Software Engineer, you will work across the stack with partner teams to bring NVIDIA's GPUs to life in a cloud or on-prem environment, ensuring end-to-end performance across compute, storage, and networking. An API Services engineer is above all responsible for ensuring a good customer and developer experience on the DGX Cloud Kubernetes Platform, working with our Runtime and Cluster Architecture teams and more to be the voice of the customer. We serve both customers looking to access their GPU compute via Kubernetes for whatever workloads they wish, as well as developers looking to use our API
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Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
Technical knowledge and experience in producing testable, scalable, reusable and resilient services to provide API services to front end systems.
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Design, build and maintain data-intensive web applications and API-driven systems
Design, build and maintain data-intensive web applications and API-driven systems
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Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
Strong technical skills: HTML, CSS, basic JavaScript, API integrations, Workato and troubleshooting.
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Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
Code quality and API-First principles are at the heart of all our development. * Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * An interest in setting strategy and direction, backed by real-work experience, ideally in an API-First setting. * Experience designing, building, and deploying scalable micro-services using API-First principles using at least one of REST/gRPC. * Strong understanding of RESTful API design principles and best practices. * Experience with API authentication and authorization mechanisms (e.g., OAuth, JWT). * Experience with API gateway technologies (e.g., Apigee, Kong) is beneficial.
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Performing automation and API testing when required. * API automation testing using JavaScript * Experience in API and integration testing
Performing automation and API testing when required. * API automation testing using JavaScript * Experience in API and integration testing
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Thales people architect identity management and data protection solutions at the heart of digital security. Business and governments rely on us to bring trust to the billons of digital interactions they have with people. Our technologies and services help banks exchange funds, people cross borders, energy become smarter and much more. More than 30,000 organizations already rely on us to verify the identities of people and things, grant access to digital services, analyze vast quantities of information and encrypt data to make the connected world more secure. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer.
Thales people architect identity management and data protection solutions at the heart of digital security. Business and governments rely on us to bring trust to the billons of digital interactions they have with people. Our technologies and services help banks exchange funds, people cross borders, energy become smarter and much more. More than 30,000 organizations already rely on us to verify the identities of people and things, grant access to digital services, analyze vast quantities of information and encrypt data to make the connected world more secure. Together we offer fantastic opportunities for committed employees to learn and develop their career with us. At Thales UK, we research, develop, and supply technology and services that impact the lives of millions of people each day to make life better, and keep us safer.
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Expertise in JavaScript and/or TypeScript and modern React, including Hooks, Context API, Server and Client Components
Expertise in JavaScript and/or TypeScript and modern React, including Hooks, Context API, Server and Client Components
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Related Jobs
Locations
- The City, City (EC3)
- Southwark
- The City, City (EC4)
- West Fields
- Euston
- White Hill
- Canary Wharf
- Datchet Common
- Frimley
- Holborn
- City of London
- South East London
- Central London
- West End
- Reading
- Cambridge
- South West London
- Milton Keynes
- Newbury
- North West London
- London
- Berkshire
- Surrey
- Cambridgeshire
- Buckinghamshire
- East Sussex
- Hampshire
- Oxfordshire
- Bedfordshire
- Essex
- South East
- East Anglia