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42 Contract API jobs in Charing Cross, Central London + 20 miles
321 exact matches jobs are outside your preferred location
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
Papaya Global is reinventing global payroll, payments, and workforce management by delivering a unified platform that simplifies and automates workforce operations in over 160 countries. Our mission is to modernize global payroll and payments, empowering companies to scale with confidence while ensuring compliance, security, and speed. As we continue our rapid growth, we are looking for a Product Manager with expertise in global payments and financial infrastructure to drive the next generation of Papayas payment products. The Role - This is a critical role focused on building and scaling Papayas payments network and infrastructure at a global level. You will be responsible for defining strategy, roadmap, and execution of products that enable compliant, secure, and efficient cross-border workforce payments.
Papaya Global is reinventing global payroll, payments, and workforce management by delivering a unified platform that simplifies and automates workforce operations in over 160 countries. Our mission is to modernize global payroll and payments, empowering companies to scale with confidence while ensuring compliance, security, and speed. As we continue our rapid growth, we are looking for a Product Manager with expertise in global payments and financial infrastructure to drive the next generation of Papayas payment products. The Role - This is a critical role focused on building and scaling Papayas payments network and infrastructure at a global level. You will be responsible for defining strategy, roadmap, and execution of products that enable compliant, secure, and efficient cross-border workforce payments.
At Lunar Energy, we're on a mission to transform the way we power our homes by building an ecosystem of all-electric products, starting with a next-generation home battery system and a cloud PaaS to manage large fleets of Distributed Energy Resources (DER) assets. Comprising a team of visionary entrepreneurs and dedicated technology and industry experts, we're united by our shared vision of deploying and building products to electrify homes that are connected through an integrated software platform. We're looking for a Staff Software Engineer to join our talented team of Software Engineers in the UK. * Building the required platform infrastructure to ingest and process big streams of data in real time, using AWS primitives * Solving complex optimisation problems, using machine learning and other often bespoke algorithms
At Lunar Energy, we're on a mission to transform the way we power our homes by building an ecosystem of all-electric products, starting with a next-generation home battery system and a cloud PaaS to manage large fleets of Distributed Energy Resources (DER) assets. Comprising a team of visionary entrepreneurs and dedicated technology and industry experts, we're united by our shared vision of deploying and building products to electrify homes that are connected through an integrated software platform. We're looking for a Staff Software Engineer to join our talented team of Software Engineers in the UK. * Building the required platform infrastructure to ingest and process big streams of data in real time, using AWS primitives * Solving complex optimisation problems, using machine learning and other often bespoke algorithms
We are seeking a Developer to join one of Millenniums long standing & successful Trading teams, currently comprising of 18. This role will design, develop and support a strategic set of applications for data collection, analytics and trading for this systematic team. Principal Responsibilities * Work directly with PMs, traders and quants to support and enhance system * Load data from multiple external and internal sources * Build monitoring system to proactively spot any data issues * Create APIs for the business to access data * Develop streaming analytics and real-time monitoring * Develop testing framework * Continual improvement of existing codebase - Main technologies: KDB+/Q, Git, Gradle, Linux. Qualifications/Skills Required * Master or Bachelor Degree in Computer Science, Mathematics or related area * Knowledge of Q/KDB+ is an advantage * Familiarity with Linu
We are seeking a Developer to join one of Millenniums long standing & successful Trading teams, currently comprising of 18. This role will design, develop and support a strategic set of applications for data collection, analytics and trading for this systematic team. Principal Responsibilities * Work directly with PMs, traders and quants to support and enhance system * Load data from multiple external and internal sources * Build monitoring system to proactively spot any data issues * Create APIs for the business to access data * Develop streaming analytics and real-time monitoring * Develop testing framework * Continual improvement of existing codebase - Main technologies: KDB+/Q, Git, Gradle, Linux. Qualifications/Skills Required * Master or Bachelor Degree in Computer Science, Mathematics or related area * Knowledge of Q/KDB+ is an advantage * Familiarity with Linu
Title: Mid- Senior Frontend Developer - Location: UK Remote - Salary: 55k - 60k plus bonus - Position: Perm - About PetLabCo. PetLab Co. is the worlds fastest-growing pet supplement business. Launching in 2018, we successfully achieved a 9-figure revenue last year without any external funding. We have a loyal community of loving pet parents and over 1.5 million happy dogs whose lives have been positively impacted by our innovative products. Our team is vibrant, fast-moving, and customer-driven where high-performers are valued and rewarded. And it is the ideal place for an ambitious, hardworking, animal lover who wants to progress their career rapidly. A Day In The Life... Reporting to our Principal Frontend Developer youll join a growing agile team of highly talented engineers working on building scalable solutions for our ecommerce platform.
Title: Mid- Senior Frontend Developer - Location: UK Remote - Salary: 55k - 60k plus bonus - Position: Perm - About PetLabCo. PetLab Co. is the worlds fastest-growing pet supplement business. Launching in 2018, we successfully achieved a 9-figure revenue last year without any external funding. We have a loyal community of loving pet parents and over 1.5 million happy dogs whose lives have been positively impacted by our innovative products. Our team is vibrant, fast-moving, and customer-driven where high-performers are valued and rewarded. And it is the ideal place for an ambitious, hardworking, animal lover who wants to progress their career rapidly. A Day In The Life... Reporting to our Principal Frontend Developer youll join a growing agile team of highly talented engineers working on building scalable solutions for our ecommerce platform.
Job no: 528019 - Brand: Scott Dunn - Work type: Hybrid - Location: London - Categories: Leisure Travel & Retail - Scott Dunn is an award-winning luxury tour operator creating tailor-made vacations to destinations all over the world. With offices in the UK, US and Singapore, we pride ourselves on providing outstanding service to all our guests from the moment they begin their research online, right the way through to post-vacation evaluations. Role Purpose - We are looking for a supportive and inclusive Engineering Manager to guide and grow a team of engineers. This role blends technical expertise with empathetic leadership, helping individuals succeed while ensuring the team delivers meaningful outcomes. * Coaching & Growth: Nurture the development of each engineer through regular 1:1s, encouragement, and personalised career support.
Job no: 528019 - Brand: Scott Dunn - Work type: Hybrid - Location: London - Categories: Leisure Travel & Retail - Scott Dunn is an award-winning luxury tour operator creating tailor-made vacations to destinations all over the world. With offices in the UK, US and Singapore, we pride ourselves on providing outstanding service to all our guests from the moment they begin their research online, right the way through to post-vacation evaluations. Role Purpose - We are looking for a supportive and inclusive Engineering Manager to guide and grow a team of engineers. This role blends technical expertise with empathetic leadership, helping individuals succeed while ensuring the team delivers meaningful outcomes. * Coaching & Growth: Nurture the development of each engineer through regular 1:1s, encouragement, and personalised career support.
6 month outside IR35 contract - As part of our exciting growth journey, were expanding our Mobile Engineering team and are on the lookout for a talented Android Engineer to join us on a hybrid basis at our London office. This is a rare chance to work on high impact greenfield products for some of the biggest and most iconic sports brands in the world. Youll be at the forefront of building modern, scalable apps from the ground up, helping shape the future of fan engagement across global sport. Youll bring technical expertise and strong delivery focus. Contributing high-quality code, collaborating closely with our in-house teams, and helping us hit key milestones. Youll be embedded in a passionate, cross-functional team and supported to do your best work while working on fast-moving, purpose-driven projects that reach millions of fans worldwide. Requirements
6 month outside IR35 contract - As part of our exciting growth journey, were expanding our Mobile Engineering team and are on the lookout for a talented Android Engineer to join us on a hybrid basis at our London office. This is a rare chance to work on high impact greenfield products for some of the biggest and most iconic sports brands in the world. Youll be at the forefront of building modern, scalable apps from the ground up, helping shape the future of fan engagement across global sport. Youll bring technical expertise and strong delivery focus. Contributing high-quality code, collaborating closely with our in-house teams, and helping us hit key milestones. Youll be embedded in a passionate, cross-functional team and supported to do your best work while working on fast-moving, purpose-driven projects that reach millions of fans worldwide. Requirements
About Lendable - Lendable is on a mission to make consumer finance amazing: faster, cheaper, and friendlier. * One of the UKs newest unicorns with a team of just over 600 people * Among the fastest-growing tech companies in the UK * Profitable since 2017 * Backed by top investors including Balderton Capital and Goldman Sachs * Loved by customers with the best reviews in the market (4.9 across 10,000s of reviews on Trustpilot) So far, weve rebuilt the Big Three consumer finance products from scratch: loans, credit cards and car finance . We get money into our customers hands in minutes instead of days. Were growing fast, and theres a lot more to do: were going after the two biggest Western markets (UK and US) where trillions worth of financial products are held by big banks with dated systems and painful processes. Join us if you want to * Take ownership across a broad
About Lendable - Lendable is on a mission to make consumer finance amazing: faster, cheaper, and friendlier. * One of the UKs newest unicorns with a team of just over 600 people * Among the fastest-growing tech companies in the UK * Profitable since 2017 * Backed by top investors including Balderton Capital and Goldman Sachs * Loved by customers with the best reviews in the market (4.9 across 10,000s of reviews on Trustpilot) So far, weve rebuilt the Big Three consumer finance products from scratch: loans, credit cards and car finance . We get money into our customers hands in minutes instead of days. Were growing fast, and theres a lot more to do: were going after the two biggest Western markets (UK and US) where trillions worth of financial products are held by big banks with dated systems and painful processes. Join us if you want to * Take ownership across a broad
Strong understanding of data integration concepts, file formats (CSV, Excel), and API-based workflows. * Hands-on experience with Postman for API testing, plus ability to read and analyze technical logs.
Strong understanding of data integration concepts, file formats (CSV, Excel), and API-based workflows. * Hands-on experience with Postman for API testing, plus ability to read and analyze technical logs.
Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
You will specialise in designing web applications, middleware/API layer and AWS Cloud environments and develop proof of concepts whilst taking ownership for end-to-end technical project delivery.
You will specialise in designing web applications, middleware/API layer and AWS Cloud environments and develop proof of concepts whilst taking ownership for end-to-end technical project delivery.
Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
Deep knowledge of enterprise architecture patterns, public cloud services (Azure, AWS), application design, integration patterns (API, event-driven), and data platforms.
Lead API design, integration strategies, and legacy modernization to microservices. * Integration - API Design & Management, CMS, Legacy Migration
Lead API design, integration strategies, and legacy modernization to microservices. * Integration - API Design & Management, CMS, Legacy Migration
Hands-on .NET experience, including C# and ASP.NET WEB API.
Hands-on .NET experience, including C# and ASP.NET WEB API.
Full Stack Engineer (Product Data Compliance) - 12 month FTC- Remote
Full Stack Engineer (Product Data Compliance) - 12 month FTC- Remote
Abcam PLC
Amersham, Buckinghamshire
Competitive
Proficiency in AWS services and serverless architecture including Lambda, API gateway, Elastic Beanstalk, EC2, S3, Aurora, Security Groups, and CloudWatch.
Proficiency in AWS services and serverless architecture including Lambda, API gateway, Elastic Beanstalk, EC2, S3, Aurora, Security Groups, and CloudWatch.
Experience with API design (REST, GraphQL), service-oriented architecture, and event-driven systems is a major plus.
Experience with API design (REST, GraphQL), service-oriented architecture, and event-driven systems is a major plus.
Dynamics 365 Customer Service, Dynamics 365 Web API
Dynamics 365 Customer Service, Dynamics 365 Web API
You will lead four teams: Platform Engineering (cloud, data platforms, developer tooling), Backstage (internal developer portal), API Developer Portal (external partner integrations), and QA Engineering (central QA strategy). What youll be doing In this role, you will provide strategic leadership for our Platform Engineering, Backstage, API Developer Portal, and QA Engineering teams, setting the vision and direction while aligning emerging industry trends with business priorities across IAG Loyalty and BA Holidays.
You will lead four teams: Platform Engineering (cloud, data platforms, developer tooling), Backstage (internal developer portal), API Developer Portal (external partner integrations), and QA Engineering (central QA strategy). What youll be doing In this role, you will provide strategic leadership for our Platform Engineering, Backstage, API Developer Portal, and QA Engineering teams, setting the vision and direction while aligning emerging industry trends with business priorities across IAG Loyalty and BA Holidays.
Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Experience in Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus
Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Experience in Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus
Solid understanding of RESTful web services and API design principles
Solid understanding of RESTful web services and API design principles
Azure API Management for rate limiting and security policies * SharePoint via Graph API (policy documents, QMS)
Azure API Management for rate limiting and security policies * SharePoint via Graph API (policy documents, QMS)
Experience of RESTful API design
Experience of RESTful API design
Own end-to-end API and IDoc integration strategy and execution through go-live.
Own end-to-end API and IDoc integration strategy and execution through go-live.
M365/Azure API integrations.
M365/Azure API integrations.
NEW
Implement data solutions leveraging AWS services such as EMR, AWS Glue, AWS Lambda, Athena, API Gateway and AWS Step Functions * Hands-on experience with AWS data services such as EMR, AWS Glue, AWS Lambda, Athena, API Gateway and AWS Step Functions
Implement data solutions leveraging AWS services such as EMR, AWS Glue, AWS Lambda, Athena, API Gateway and AWS Step Functions * Hands-on experience with AWS data services such as EMR, AWS Glue, AWS Lambda, Athena, API Gateway and AWS Step Functions
Related Jobs
Locations
- Southwark
- The City, City (EC4)
- West Fields
- Charing Cross
- Euston
- Frimley
- Holborn
- Ireland
- The City, City (EC2)
- The City, City (EC3)
- City of London
- Reading
- South East London
- Central London
- West End
- Camberley
- Cambridge
- Farnborough
- Newbury
- North West London
- London
- Berkshire
- Surrey
- Hampshire
- Oxfordshire
- Buckinghamshire
- Cambridgeshire
- Bedfordshire
- East Sussex
- West Sussex
- South East
- East Anglia