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        38 Permanent API jobs in Mayfair + 20 miles

        166 exact matches jobs are outside your preferred location

        Senior Backend Engineer

        Onetrace
        London
        Competitive
        From refining API design to optimising performance and observability, youll be the driving force behind the systems that keep Onetrace running smoothly and growing fast. * RESTful API design and implementation
        From refining API design to optimising performance and observability, youll be the driving force behind the systems that keep Onetrace running smoothly and growing fast. * RESTful API design and implementation
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        Balance roadmap and service levels: Prioritise platform improvements, API consistency, reliability SLAs, and technical documentation to ensure smooth usage by other teams. * 4+ years in product management with a strong technical focus-ideally in infrastructure, platform, or API products.
        Balance roadmap and service levels: Prioritise platform improvements, API consistency, reliability SLAs, and technical documentation to ensure smooth usage by other teams. * 4+ years in product management with a strong technical focus-ideally in infrastructure, platform, or API products.
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        We are seeking an Agentic AI Engineer to join our growing AI & Data Science team. This role focuses on building, deploying, and scaling agentic AI systems autonomous, goal-driven AI agents that augment decision-making, automate complex workflows, and deliver actionable insights across Exiger's risk and compliance platforms. You will work closely with data scientists, software engineers, and product leaders to push the boundaries of applied AI in high-stakes environments. Key Responsibilities * Design, develop, and deploy agentic AI systems capable of reasoning, planning, and autonomously executing multi-step tasks. * Integrate large language models (LLMs) , vector databases, and external APIs into dynamic agent frameworks. * Collaborate with product teams to translate compliance, risk, and supply chain use cases into scalable AI-driven workflows.
        We are seeking an Agentic AI Engineer to join our growing AI & Data Science team. This role focuses on building, deploying, and scaling agentic AI systems autonomous, goal-driven AI agents that augment decision-making, automate complex workflows, and deliver actionable insights across Exiger's risk and compliance platforms. You will work closely with data scientists, software engineers, and product leaders to push the boundaries of applied AI in high-stakes environments. Key Responsibilities * Design, develop, and deploy agentic AI systems capable of reasoning, planning, and autonomously executing multi-step tasks. * Integrate large language models (LLMs) , vector databases, and external APIs into dynamic agent frameworks. * Collaborate with product teams to translate compliance, risk, and supply chain use cases into scalable AI-driven workflows.
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        Location: London, UK (Hybrid Working) Department: Investment Operations, Fund Services - Reports to: Manager, Data Production UK - Employment Type: Full-Time - We are a global investment leader committed to delivering better outcomes for millions of members. If youre passionate about data, thrive in a collaborative environment, and want to play a key role in shaping the future of investment data services in our growing London office, this is your opportunity. At AustralianSuper , were more than a super fundwere a purpose-driven organisation focused on helping members achieve their best financial position in retirement. As we continue to expand our global footprint, were looking for a dedicated Data Analyst to join our Investment Data Services team. This is a unique opportunity to support data transformation initiatives that directly impact investment decision-making a
        Location: London, UK (Hybrid Working) Department: Investment Operations, Fund Services - Reports to: Manager, Data Production UK - Employment Type: Full-Time - We are a global investment leader committed to delivering better outcomes for millions of members. If youre passionate about data, thrive in a collaborative environment, and want to play a key role in shaping the future of investment data services in our growing London office, this is your opportunity. At AustralianSuper , were more than a super fundwere a purpose-driven organisation focused on helping members achieve their best financial position in retirement. As we continue to expand our global footprint, were looking for a dedicated Data Analyst to join our Investment Data Services team. This is a unique opportunity to support data transformation initiatives that directly impact investment decision-making a
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        About AppyWay - AppyWay helps cities reduce carbon emissions by making it easier to manage and find parking. The company started with a simple parking app called AppyParking because street parking data wasnt easy to access or understand. This led them to create the largest database of standardized parking data in the UK. Our Traffic Suite platform empowers local authorities with best-in-class kerbside data, APIs, and tools to manage traffic orders, parking, and street space more efficiently. Now, AppyWays platform is used by cities across Europe and even in New York City. It provides parking maps, real-time availability, and cashless payment options to help drivers and delivery fleets find parking more efficiently. Theyve raised over £20 million from investors like Hyundai and Mastercard to continue growing.
        About AppyWay - AppyWay helps cities reduce carbon emissions by making it easier to manage and find parking. The company started with a simple parking app called AppyParking because street parking data wasnt easy to access or understand. This led them to create the largest database of standardized parking data in the UK. Our Traffic Suite platform empowers local authorities with best-in-class kerbside data, APIs, and tools to manage traffic orders, parking, and street space more efficiently. Now, AppyWays platform is used by cities across Europe and even in New York City. It provides parking maps, real-time availability, and cashless payment options to help drivers and delivery fleets find parking more efficiently. Theyve raised over £20 million from investors like Hyundai and Mastercard to continue growing.
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        About iProov - iProov provides science-based biometric solutions that enable the worlds most security-conscious organizations to streamline secure remote onboarding and authentication for digital and physical access. Our award-winning liveness technology and iSOC offer unmatched resilience against deepfakes and generative AI threats while ensuring effortless, scalable user experiences. Trusted by leading governments and enterprises, including the U.S. Department of Homeland Security, U.K. Home Office, GovTech Singapore, ING, and UBS, iProov sets the standard in biometric identity assurance. This global trust is built not only on our technology but on the strength of the people behind it. For us, diversity at iProov is about reflecting the customers we serve, holding the principles of equality and inclusion at the heart of everything we do and all that we stand for, ..
        About iProov - iProov provides science-based biometric solutions that enable the worlds most security-conscious organizations to streamline secure remote onboarding and authentication for digital and physical access. Our award-winning liveness technology and iSOC offer unmatched resilience against deepfakes and generative AI threats while ensuring effortless, scalable user experiences. Trusted by leading governments and enterprises, including the U.S. Department of Homeland Security, U.K. Home Office, GovTech Singapore, ING, and UBS, iProov sets the standard in biometric identity assurance. This global trust is built not only on our technology but on the strength of the people behind it. For us, diversity at iProov is about reflecting the customers we serve, holding the principles of equality and inclusion at the heart of everything we do and all that we stand for, ..
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        Contract / FTC / Perm | Remote (UK) with occasional client site visits | Competitive - About BaseOne - At BaseOne, we design and deliver human-centric data solutions for some of the worlds most complex projects from major infrastructure to energy and banking. Our team blends deep domain expertise in project controls with modern tools like Power BI, Microsoft Fabric, and AI-driven analytics , helping clients make better decisions with confidence. Were now looking for a Power BI & Fabric Developer with hands-on experience in Primavera P6 project controls data to join our delivery team. This is a chance to work on high-impact projects across the UK and internationally, building reporting solutions that simplify complexity for decision makers. The Role - Youll be part of a multidisciplinary team working directly with project controls, PMO, and client stakeholders.
        Contract / FTC / Perm | Remote (UK) with occasional client site visits | Competitive - About BaseOne - At BaseOne, we design and deliver human-centric data solutions for some of the worlds most complex projects from major infrastructure to energy and banking. Our team blends deep domain expertise in project controls with modern tools like Power BI, Microsoft Fabric, and AI-driven analytics , helping clients make better decisions with confidence. Were now looking for a Power BI & Fabric Developer with hands-on experience in Primavera P6 project controls data to join our delivery team. This is a chance to work on high-impact projects across the UK and internationally, building reporting solutions that simplify complexity for decision makers. The Role - Youll be part of a multidisciplinary team working directly with project controls, PMO, and client stakeholders.
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        Job Description - Purpose of the role - To manage and develop existing and new products and/or services; and where applicable, ownership of related customer and colleague journeys, develops the product strategy, drive change through Barclays execution teams, make key decisions in the product lifecycle and own associated outcomes for customers, colleagues and the bank, achieved through appropriate service level agreements, regulatory compliance, risk management and controls. Accountabilities * Development of customer level strategies & solutions that are tailored to customers needs. * Subject Matter Expert in the applicable Product/Proposition team and be able to confidently guide and advise stakeholders at all levels in the Bank on the application of existing and new products/propositions and related customer and colleague journeys.
        Job Description - Purpose of the role - To manage and develop existing and new products and/or services; and where applicable, ownership of related customer and colleague journeys, develops the product strategy, drive change through Barclays execution teams, make key decisions in the product lifecycle and own associated outcomes for customers, colleagues and the bank, achieved through appropriate service level agreements, regulatory compliance, risk management and controls. Accountabilities * Development of customer level strategies & solutions that are tailored to customers needs. * Subject Matter Expert in the applicable Product/Proposition team and be able to confidently guide and advise stakeholders at all levels in the Bank on the application of existing and new products/propositions and related customer and colleague journeys.
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        81357 - Power System & Product Development Engineer - This Power System & Product Development Engineer will report to the Network Access Manager and will work within DSO directorate based in our London office. You will be a permanent employee. You will attract a salary of £80,574.00 and a bonus of 3%. This role can also offer blended working after probationary period (6 months) - 3 days in the office and 2 remote - Close Date: 14/09/2025 - We also provide the following additional benefits * 25 Days Annual Leave plus bank holidays. * Reservist Leave Additional 18 days full pay and 22 unpaid * Personal Pension Plan Personal contribution rates of 4% or 5% (UK Power Networks will make a corresponding contribution of 8% or 10%) * Tenancy Loan Deposit Scheme, Season Ticket Loan * Tax efficient benefits: Cycle to Work, Home & Tech, and Green Car Leasing Schemes * Occupationa
        81357 - Power System & Product Development Engineer - This Power System & Product Development Engineer will report to the Network Access Manager and will work within DSO directorate based in our London office. You will be a permanent employee. You will attract a salary of £80,574.00 and a bonus of 3%. This role can also offer blended working after probationary period (6 months) - 3 days in the office and 2 remote - Close Date: 14/09/2025 - We also provide the following additional benefits * 25 Days Annual Leave plus bank holidays. * Reservist Leave Additional 18 days full pay and 22 unpaid * Personal Pension Plan Personal contribution rates of 4% or 5% (UK Power Networks will make a corresponding contribution of 8% or 10%) * Tenancy Loan Deposit Scheme, Season Ticket Loan * Tax efficient benefits: Cycle to Work, Home & Tech, and Green Car Leasing Schemes * Occupationa
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        Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
        Mastercard Developers ( is the primary API platform for Mastercard partners to access a diverse range of payment, data, loyalty, and security APIs. The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Act as subject matter expert for Mastercard Developers API Platform and services to support customer integrations on occasion - Proven track record in API based products
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        Define and maintain API specifications. You understand and have implemented Application Programming Interface (API) standards and cataloguing to drive API/service adoption and commercialization.
        Define and maintain API specifications. You understand and have implemented Application Programming Interface (API) standards and cataloguing to drive API/service adoption and commercialization.
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        LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. Its how weve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services and our open-access model we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.LSEG is headquartered in the United Kingdom, with significant ...
        LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. Its how weve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services and our open-access model we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.LSEG is headquartered in the United Kingdom, with significant ...
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        Security Architecture Secure Design Team - Role: Manager Principal Security Architect: Secure Design (Individual Contributor) Grade: GG14 - The Security Architecture Design team is responsible for developing Security Architecture patterns, developing security controls needed for new technology, promoting the use of the architectural patterns into development projects, leading the Security Architecture Design Forum, Evaluating architectural security risks in existing systems, consulting with system development teams and architects on building security into their design. This key task of this role is accelerating the delivery of secure design artefacts and leading secure design interventions - by adding capacity and capability to the team. Reports to: Senior Manager Secure Design - Key Relationships * Business Aligned Principal Security Architects * CyberSecurity Engine
        Security Architecture Secure Design Team - Role: Manager Principal Security Architect: Secure Design (Individual Contributor) Grade: GG14 - The Security Architecture Design team is responsible for developing Security Architecture patterns, developing security controls needed for new technology, promoting the use of the architectural patterns into development projects, leading the Security Architecture Design Forum, Evaluating architectural security risks in existing systems, consulting with system development teams and architects on building security into their design. This key task of this role is accelerating the delivery of secure design artefacts and leading secure design interventions - by adding capacity and capability to the team. Reports to: Senior Manager Secure Design - Key Relationships * Business Aligned Principal Security Architects * CyberSecurity Engine
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        The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Continually ideate, scope, develop, deliver, test and iterate features for the constantly evolving and growing API Platform. Act as subject matter expert for API Platform and services to support customer integrations on occasion
        The team is responsible for delivering an experience that ensures developers can quickly find the right API, assess its technical capabilities and integrate it into new and innovative solutions. Continually ideate, scope, develop, deliver, test and iterate features for the constantly evolving and growing API Platform. Act as subject matter expert for API Platform and services to support customer integrations on occasion
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        The primary responsibility of the CI group is to work with broker-dealers and institutional clients to help them integrate their systems to the MarketAxess Fixed Income trading system via Application Programming Interfaces (API). * FIX API integration for various fixed income products as well as Post-Trade and Data API products. * Work closely with Product Owners and customers on the deployment of new API functionality and workflows and implement features with client requirements/needs in mind
        The primary responsibility of the CI group is to work with broker-dealers and institutional clients to help them integrate their systems to the MarketAxess Fixed Income trading system via Application Programming Interfaces (API). * FIX API integration for various fixed income products as well as Post-Trade and Data API products. * Work closely with Product Owners and customers on the deployment of new API functionality and workflows and implement features with client requirements/needs in mind
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        Introduction - Together, were working to welcome millions more passengers, while ensuring aviation can continue to be a force for good by leading global efforts in sustainability. At Heathrow, you can be part of this providing solutions that make every journey better for millions each year. That means ensuring we meet the changing needs of the passengers, colleagues and partners who use our airport to work, travel, trade, shop, eat, explore and connect. Our Solutions team covers project management, process improvement, business change, technology, cyber defence, masterplanning, infrastructure and procurement. It brings together people with the skills to deliver prestigious and often large-scale projects, from transforming terminals to making big reductions in our carbon emissions. Every day will test your skills and give you the opportunity to make your mark.
        Introduction - Together, were working to welcome millions more passengers, while ensuring aviation can continue to be a force for good by leading global efforts in sustainability. At Heathrow, you can be part of this providing solutions that make every journey better for millions each year. That means ensuring we meet the changing needs of the passengers, colleagues and partners who use our airport to work, travel, trade, shop, eat, explore and connect. Our Solutions team covers project management, process improvement, business change, technology, cyber defence, masterplanning, infrastructure and procurement. It brings together people with the skills to deliver prestigious and often large-scale projects, from transforming terminals to making big reductions in our carbon emissions. Every day will test your skills and give you the opportunity to make your mark.
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        Frequently Asked Questions

        How many permanent API jobs are there in Mayfair?
        There are 38 permanent API jobs within 20 miles of Mayfair available on CWJobs right now.

        Where in Mayfair are these permanent jobs?
        You can find permanent jobs in Frimley, Millwall, Shadwell.

        What other similar jobs are there to permanent API jobs in Mayfair?
        As well as permanent API jobs in Mayfair, you can find permanent IT, Software Development, Management, amongst many others.