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108 Permanent API jobs in South East + 5 miles
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Our Purpose - Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary - As a Lead AI Engineer at Mastercard, you will be instrumental in designing, building, and scaling AI microservices that transform PoC notebooks into robust, production-ready components. You will play a pivotal role in creating the foundational AI services that power our next-generation solutions, ensuring they are scalable, efficient, and seamlessly
Our Purpose - Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, were helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary - As a Lead AI Engineer at Mastercard, you will be instrumental in designing, building, and scaling AI microservices that transform PoC notebooks into robust, production-ready components. You will play a pivotal role in creating the foundational AI services that power our next-generation solutions, ensuring they are scalable, efficient, and seamlessly
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Senior Backend Engineer - Data Pipelines - £600.day
Senior Backend Engineer - Data Pipelines - £600.day
Wilson Brown Limited
EC1, City of London
Up to £600 per day Outside IR35 & Fully Remote (UK)
Senior Software Engineer - Data & Backend - Up to £600.day outside IR35 - LegalTech | Remote (UK) | Python | GCP | Data Pipelines | Event-Based Solutions - Were helping a seed-funded LegalTech startup build their MVP. They need a Data-Focused Senior Software Engineer with a passion for building data pipelines and backend engineering using Python. If you crave a role where you can build 0-1 and have big impact then look no further! * Location: Remote (UK Only) * Outside IR35 * Up to £600.day * 3 months (possible extension) As the Software Engineer on this project, youll design and build data pipelines in Python and GCP, deliver high-performance backend systems, and implement IaC to ensure everything scales. * Build backend services and data pipelines from scratch * Architect event-driven solutions in GCP with Pub/Sub & Cloud Run
Senior Software Engineer - Data & Backend - Up to £600.day outside IR35 - LegalTech | Remote (UK) | Python | GCP | Data Pipelines | Event-Based Solutions - Were helping a seed-funded LegalTech startup build their MVP. They need a Data-Focused Senior Software Engineer with a passion for building data pipelines and backend engineering using Python. If you crave a role where you can build 0-1 and have big impact then look no further! * Location: Remote (UK Only) * Outside IR35 * Up to £600.day * 3 months (possible extension) As the Software Engineer on this project, youll design and build data pipelines in Python and GCP, deliver high-performance backend systems, and implement IaC to ensure everything scales. * Build backend services and data pipelines from scratch * Architect event-driven solutions in GCP with Pub/Sub & Cloud Run
Have the digital world at your feet - As an Engineering Technical Lead at the FA, you will be responsible for leading the software engineers within your Pod (Team/Value stream). You will be key in ensuring your Pod builds the right thing in the right way. This is a technical leadership role responsible for the end-to-end development of a suite of FA applications. Working primarily within a Microsoft-based technology stack, the role serves as the central point for all development activities. Key responsibilities include establishing coding standards, implementing quality assurance processes, and overseeing the work of developers. The ideal candidate will wear multiple hats-acting as an architect, delivery manager, engineer, quality assurance, mentor, problem solver, and collaborative team member-ensuring both technical excellence and alignment with business goals.
Have the digital world at your feet - As an Engineering Technical Lead at the FA, you will be responsible for leading the software engineers within your Pod (Team/Value stream). You will be key in ensuring your Pod builds the right thing in the right way. This is a technical leadership role responsible for the end-to-end development of a suite of FA applications. Working primarily within a Microsoft-based technology stack, the role serves as the central point for all development activities. Key responsibilities include establishing coding standards, implementing quality assurance processes, and overseeing the work of developers. The ideal candidate will wear multiple hats-acting as an architect, delivery manager, engineer, quality assurance, mentor, problem solver, and collaborative team member-ensuring both technical excellence and alignment with business goals.
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API authentication (OAuth 2.0, Azure AD).
API authentication (OAuth 2.0, Azure AD).
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Ensure engineering design complies with API, EN, EEMUA, ASME standards.
Ensure engineering design complies with API, EN, EEMUA, ASME standards.
Junior Presales Engineer, UK (German & English)
Junior Presales Engineer, UK (German & English)
Optibus Transportation Limited
The City, EC2M 5TQ
From £39,000 to £45,000 per annum Salary displays OTE, which is 80% &
Optibusis a unified software platform revolutionizing public transportation planning, scheduling, and operations in over 7,000 cities worldwide. Using AI, ML, and optimization algorithms, it empowers agencies to design more efficient, equitable, and sustainable transit networks, enhancing passenger access, reducing emissions, and improving driver conditions. With offices globally and a team of 350+ employees, Optibus fosters a collaborative culture centered on innovation, determination, and impact. As the first unicorn in public transportation technology, Optibus is driving the modernization of mass transit to make it the preferred choice for cities and passengers alike. We are looking for a Junior Presales Engineer to join our global Revenue team! Based in London, this individual will play a crucial role in supporting core presales engineering activities in showcasin
Optibusis a unified software platform revolutionizing public transportation planning, scheduling, and operations in over 7,000 cities worldwide. Using AI, ML, and optimization algorithms, it empowers agencies to design more efficient, equitable, and sustainable transit networks, enhancing passenger access, reducing emissions, and improving driver conditions. With offices globally and a team of 350+ employees, Optibus fosters a collaborative culture centered on innovation, determination, and impact. As the first unicorn in public transportation technology, Optibus is driving the modernization of mass transit to make it the preferred choice for cities and passengers alike. We are looking for a Junior Presales Engineer to join our global Revenue team! Based in London, this individual will play a crucial role in supporting core presales engineering activities in showcasin
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They're after a Principal Infrastructure Engineer who’s as comfortable scripting against an API as they are deep-diving into Nutanix clusters. * Automate everything – Terraform, PowerShell, Python, REST APIs (Nutanix CLI/API experience a big plus)
They're after a Principal Infrastructure Engineer who’s as comfortable scripting against an API as they are deep-diving into Nutanix clusters. * Automate everything – Terraform, PowerShell, Python, REST APIs (Nutanix CLI/API experience a big plus)
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Proficient in hands-on development, coding, and API design.
Proficient in hands-on development, coding, and API design.
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They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team members come with varying levels of experience and backgrounds. Relevant industry experience is important (Software Engineer, Site Reliability Engineer (SRE), Systems Engineer, DevOps Engineer, Network Engineer, Database Administrator or similar role), but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Meta in Production Engineering, and we are always learning. This position is full-time. * Own the end-to-end reliability and scalability of the platforms, services, and products built on top of Metas underlying infrastructure and network * Write and review code, develop documentation and capacity plans, and debug the hardest problems
They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team members come with varying levels of experience and backgrounds. Relevant industry experience is important (Software Engineer, Site Reliability Engineer (SRE), Systems Engineer, DevOps Engineer, Network Engineer, Database Administrator or similar role), but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Meta in Production Engineering, and we are always learning. This position is full-time. * Own the end-to-end reliability and scalability of the platforms, services, and products built on top of Metas underlying infrastructure and network * Write and review code, develop documentation and capacity plans, and debug the hardest problems
They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team is comprised of varying levels of experience and backgrounds, from new grads to industry veterans. Relevant industry experience is important (Site Reliability Engineer (SRE), Systems Engineer, Software Engineer, DevOps Engineer, Network Engineer, Systems Administrator, Linux Administrator, Database Administrator or similar role), but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Meta in Production Engineering, and we are always learning. * Own back-end services like our container fleet management systems, front-end services like Chat and Newsfeed, infrastructure components like our Memcache infrastructure, and everything in betwee
They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team is comprised of varying levels of experience and backgrounds, from new grads to industry veterans. Relevant industry experience is important (Site Reliability Engineer (SRE), Systems Engineer, Software Engineer, DevOps Engineer, Network Engineer, Systems Administrator, Linux Administrator, Database Administrator or similar role), but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Meta in Production Engineering, and we are always learning. * Own back-end services like our container fleet management systems, front-end services like Chat and Newsfeed, infrastructure components like our Memcache infrastructure, and everything in betwee
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At Burberry, we believe creativity opens spaces. Our purpose is to unlock the power of imagination to push boundaries and open new possibilities for our people, our customers and our communities. This is the core belief that has guided Burberry since it was founded in 1856 and is central to how we operate as a company today. We aim to provide an environment for creative minds from different backgrounds to thrive, bringing a wide range of skills and experiences to everything we do. As a purposeful, values-driven brand, we are committed to being a force for good in the world as well, creating the next generation of sustainable luxury for customers, driving industry change and championing our communities. The Principal Engineer will act as a technical thought partner and knowledge anchor for platform engineering across our Digital ecosystem.
At Burberry, we believe creativity opens spaces. Our purpose is to unlock the power of imagination to push boundaries and open new possibilities for our people, our customers and our communities. This is the core belief that has guided Burberry since it was founded in 1856 and is central to how we operate as a company today. We aim to provide an environment for creative minds from different backgrounds to thrive, bringing a wide range of skills and experiences to everything we do. As a purposeful, values-driven brand, we are committed to being a force for good in the world as well, creating the next generation of sustainable luxury for customers, driving industry change and championing our communities. The Principal Engineer will act as a technical thought partner and knowledge anchor for platform engineering across our Digital ecosystem.
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They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team is comprised of varying levels of experience and backgrounds, from new grads to industry. Relevant industry experience is important, but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Facebook in Production Engineering, and we are always learning. This position is full-time. * Own back-end services like our Hadoop data warehouses, front-end services like Messenger and Newsfeed, infrastructure components like our Memcache infrastructure, and everything in between * Write and review code, develop documentation and capacity plans, and debug the hardest problems, live, on some of the largest and most complex systems in the world
They are embedded in every one of Facebook's product and infrastructure teams, and are core participants in every significant engineering effort underway in the company. Our team is comprised of varying levels of experience and backgrounds, from new grads to industry. Relevant industry experience is important, but ultimately less so than your demonstrated abilities and attitude. We sail into uncharted waters every day at Facebook in Production Engineering, and we are always learning. This position is full-time. * Own back-end services like our Hadoop data warehouses, front-end services like Messenger and Newsfeed, infrastructure components like our Memcache infrastructure, and everything in between * Write and review code, develop documentation and capacity plans, and debug the hardest problems, live, on some of the largest and most complex systems in the world
You will be joining the team that is responsible for the design and implementation of Meta's global core IP networks (Express Backbone). The team is responsible for the routing platforms, protocols, and architecture that connect Meta's data centers to each other as well as to the networks that connect them to the internet. Our backbones continue to rapidly expand globally, based on the, most recently, network demands that our AGI journey brings. One of them, 'Express Backbone', handles machine to machine traffic between our Data Centers. You are an experienced network engineers with demonstrated experience in software engineering, who regularly perform analytical and data-driven dives into the workings of the backbone but also hold manufacturers to deliver and scale their products and work in cross functional environment.
You will be joining the team that is responsible for the design and implementation of Meta's global core IP networks (Express Backbone). The team is responsible for the routing platforms, protocols, and architecture that connect Meta's data centers to each other as well as to the networks that connect them to the internet. Our backbones continue to rapidly expand globally, based on the, most recently, network demands that our AGI journey brings. One of them, 'Express Backbone', handles machine to machine traffic between our Data Centers. You are an experienced network engineers with demonstrated experience in software engineering, who regularly perform analytical and data-driven dives into the workings of the backbone but also hold manufacturers to deliver and scale their products and work in cross functional environment.
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Contract Golang Engineer AI for Defence £700800/day | Inside IR35 | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Initial 3-month contract (extensions expected up to 12 months) Join a ground-breaking AI programme delivering national security impact. Were working with a leading UK AI firm on a mission-critical Defence deployment. This greenfield build calls for a Golang specialist to help deliver backend systems that support real-time inference, transcription pipelines, and natural language interaction all under tight performance and security constraints. * Build high-performance services using Golang in secure environments * Develop ingestion and processing pipelines for transcription and structured/unstructured data * Contribute to intelligent data flows including graph-based and RAG inference pipelines
Contract Golang Engineer AI for Defence £700800/day | Inside IR35 | Hybrid / Secure Site | SC/DV Cleared | UK Nationals Only - Initial 3-month contract (extensions expected up to 12 months) Join a ground-breaking AI programme delivering national security impact. Were working with a leading UK AI firm on a mission-critical Defence deployment. This greenfield build calls for a Golang specialist to help deliver backend systems that support real-time inference, transcription pipelines, and natural language interaction all under tight performance and security constraints. * Build high-performance services using Golang in secure environments * Develop ingestion and processing pipelines for transcription and structured/unstructured data * Contribute to intelligent data flows including graph-based and RAG inference pipelines
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Lead Engineer
Lead Engineer
GH Engage Limited
The City, EC3
£55000 - £57500 per annum + 9% Pension, Medical, 25 days annual leave
Maintenance | Fit Outs | Permits to Work £55,000/annum + bonus | Exceptional client-side benefits | Client Side - 13 Month Fixed-Term-Contract - GH Engage are currently seeking an experienced Lead Engineer with a background in electrical / mechanical engineering maintenance for a role in the City of London. As a Lead Engineer, you will support the maintenance team and Fit-Out Supervisor in managing tenant and landlord fit-out projects, as well as performing maintenance, diagnostics, and fault finding on HVAC and electrical plant. * You will work closely with tenants, contractors, and consultants to monitor maintenance works on landlord plant and equipment, including electrical, mechanical, water treatment, and HVAC systems. * Review contractor and tenant risk assessments and method statements, monitor permits to work, and control access to plant areas.
Maintenance | Fit Outs | Permits to Work £55,000/annum + bonus | Exceptional client-side benefits | Client Side - 13 Month Fixed-Term-Contract - GH Engage are currently seeking an experienced Lead Engineer with a background in electrical / mechanical engineering maintenance for a role in the City of London. As a Lead Engineer, you will support the maintenance team and Fit-Out Supervisor in managing tenant and landlord fit-out projects, as well as performing maintenance, diagnostics, and fault finding on HVAC and electrical plant. * You will work closely with tenants, contractors, and consultants to monitor maintenance works on landlord plant and equipment, including electrical, mechanical, water treatment, and HVAC systems. * Review contractor and tenant risk assessments and method statements, monitor permits to work, and control access to plant areas.
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Senior Account Partner/Account Partner Director, Services Sales, Energy and Utilities UKI
Senior Account Partner/Account Partner Director, Services Sales, Energy and Utilities UKI
Salesforce
South East
Competitive
To get the best candidate experience, please consider applying for a maximum of 3 roles within 12 months to ensure you are not duplicating efforts. Job Category - Customer Success - Job Details - About Salesforce - Were Salesforce, the Customer Company, inspiring the future of business with AI+ Data +CRM. Leading with our core values, we help companies across every industry blaze new trails and connect with customers in a whole new way. And, we empower you to be a Trailblazer, too driving your performance and career growth, charting new paths, and improving the state of the world. If you believe in business as the greatest platform for change and in companies doing well and doing good youve come to the right place. Senior Account Partner/Account Partner Director, Services Sales - Industry: Energy & Utilities - Location: London, UK
To get the best candidate experience, please consider applying for a maximum of 3 roles within 12 months to ensure you are not duplicating efforts. Job Category - Customer Success - Job Details - About Salesforce - Were Salesforce, the Customer Company, inspiring the future of business with AI+ Data +CRM. Leading with our core values, we help companies across every industry blaze new trails and connect with customers in a whole new way. And, we empower you to be a Trailblazer, too driving your performance and career growth, charting new paths, and improving the state of the world. If you believe in business as the greatest platform for change and in companies doing well and doing good youve come to the right place. Senior Account Partner/Account Partner Director, Services Sales - Industry: Energy & Utilities - Location: London, UK
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Our client, a respected UK leader in mission-critical software and systems, is seeking a capable contractor to assist with API development and systems integration involving Oracle and internal platforms. * Familiarity with API development and integration
Our client, a respected UK leader in mission-critical software and systems, is seeking a capable contractor to assist with API development and systems integration involving Oracle and internal platforms. * Familiarity with API development and integration
We are a fast-growing data-as-a-service provider helping businesses access high-quality business data via a robust REST API. As a Sales Engineer, you will work closely with our sales team to identify customer needs, explore potential solutions using our API, and ensure a smooth technical onboarding experience. * Explain API capabilities, data models, and integration workflows in a clear, customer-centric way * Evaluate customer challenges and propose tailored solutions using our REST API and MCP * Deliver demos, proof-of-concept support, and API walkthroughs * Solid understanding of APIs, REST, JSON, authentication (OAuth, API keys), and data workflows * Comfortable debugging basic integration issues (e.g., API calls, response errors, authentication p
We are a fast-growing data-as-a-service provider helping businesses access high-quality business data via a robust REST API. As a Sales Engineer, you will work closely with our sales team to identify customer needs, explore potential solutions using our API, and ensure a smooth technical onboarding experience. * Explain API capabilities, data models, and integration workflows in a clear, customer-centric way * Evaluate customer challenges and propose tailored solutions using our REST API and MCP * Deliver demos, proof-of-concept support, and API walkthroughs * Solid understanding of APIs, REST, JSON, authentication (OAuth, API keys), and data workflows * Comfortable debugging basic integration issues (e.g., API calls, response errors, authentication p
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Staff Back End Engineer
Staff Back End Engineer
John Lewis & Partners
SW1V, South West London, SW1V 2QQ
From £75,000 to £92,000 per annum
REST API development and/or consumption.
REST API development and/or consumption.
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Based in Northamptonshire, our Rushden site is a centre of excellence for Radiolabelled Sciences incorporating both Metabolism (which includes Clinical Metabolism, Pre-clinical ADME, In vitro and DDI services, Large Molecule Metabolism, Environmental Fate, Plant Metabolism and Metabolite Identification) in addition to Chemistry (which includes API and IMP manufacture).
Based in Northamptonshire, our Rushden site is a centre of excellence for Radiolabelled Sciences incorporating both Metabolism (which includes Clinical Metabolism, Pre-clinical ADME, In vitro and DDI services, Large Molecule Metabolism, Environmental Fate, Plant Metabolism and Metabolite Identification) in addition to Chemistry (which includes API and IMP manufacture).
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Experience of configuring API-driven workflows and third-party system integrations
Experience of configuring API-driven workflows and third-party system integrations
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API development using technologies and standards like REST/GraphQL/gRPC or similar.
API development using technologies and standards like REST/GraphQL/gRPC or similar.
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Senior Java Engineering Lead - Digital Markets Infrastructure
Senior Java Engineering Lead - Digital Markets Infrastructure
London Stock Exchange
South East
Competitive
Solid understanding of REST API design principles.
Solid understanding of REST API design principles.
Proficient in API design, development & production operation
Proficient in API design, development & production operation
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As part of the global API Group, we join a family of organisations where leadership, and leadership development is our most powerful strategic advantage and the best way to invest in our people.
As part of the global API Group, we join a family of organisations where leadership, and leadership development is our most powerful strategic advantage and the best way to invest in our people.
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