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83 API jobs in The City, City of London + 20 miles
431 exact matches jobs are outside your preferred location
Collaborate closely on system architecture, data flows, and API structures to ensure design feasibility and coherence.
Collaborate closely on system architecture, data flows, and API structures to ensure design feasibility and coherence.
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Reporting to our CPO, you will lead the strategy and roadmap across mobile ticketing and payments, Account-Based Ticketing, EMV, our API and integration layer, and the requirements that underpin reliability, performance and service tiers. * Define and own the strategy for Masabis core platform domains, including ABT, EMV, mobile ticketing, the fare engine and our API and integration layer. * Treat our API platform and integration layer as first-class products. * Strengthen the developer and partner experience through improved API coverage, documentation and tooling.
Reporting to our CPO, you will lead the strategy and roadmap across mobile ticketing and payments, Account-Based Ticketing, EMV, our API and integration layer, and the requirements that underpin reliability, performance and service tiers. * Define and own the strategy for Masabis core platform domains, including ABT, EMV, mobile ticketing, the fare engine and our API and integration layer. * Treat our API platform and integration layer as first-class products. * Strengthen the developer and partner experience through improved API coverage, documentation and tooling.
This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI to pioneer of AI-first development practices. * Design and implement scalable microservices with API-first mindset API-First & Microservices Excellence * Create comprehensive API documentation and developer guides API-First & Microservices Architecture * Deep knowledge of API design principles and RESTful/GraphQL patterns * Understanding of service mesh, API gateways, and inter-service communication * API design and documentation tools (Swagger/OpenAPI, Postman)
This role is part of our Digital Platform Services team, who are responsible for delivering central services to the divisions in an API first way by utilising AI to pioneer of AI-first development practices. * Design and implement scalable microservices with API-first mindset API-First & Microservices Excellence * Create comprehensive API documentation and developer guides API-First & Microservices Architecture * Deep knowledge of API design principles and RESTful/GraphQL patterns * Understanding of service mesh, API gateways, and inter-service communication * API design and documentation tools (Swagger/OpenAPI, Postman)
The Developer Platform team supports 75B+ API calls and a growing marketplace with 300+ partner applications.
The Developer Platform team supports 75B+ API calls and a growing marketplace with 300+ partner applications.
Work closely with IT teams to support data integration initiatives, with our customers & brokers to leverage our API capabilities to streamline processes and enable seamless data exchange across platforms.
Work closely with IT teams to support data integration initiatives, with our customers & brokers to leverage our API capabilities to streamline processes and enable seamless data exchange across platforms.
Lead Transformation: Transition from monolithic applications to an API-first, modular platform strategy.
Lead Transformation: Transition from monolithic applications to an API-first, modular platform strategy.
Apply a core understanding of API and Webhook functionality to help customers achieve key customer use cases utilizing the Klaviyo platform.
Apply a core understanding of API and Webhook functionality to help customers achieve key customer use cases utilizing the Klaviyo platform.
Facilitate Onboarding: Youll be responsible for the technical onboarding of new clients, guiding them through API documentation, troubleshooting integration issues, and ensuring a seamless transition.
Facilitate Onboarding: Youll be responsible for the technical onboarding of new clients, guiding them through API documentation, troubleshooting integration issues, and ensuring a seamless transition.
Our API service layer is written in Go, following a documentation-first mindset. * Experience delivering cloud-based REST API solutions
Our API service layer is written in Go, following a documentation-first mindset. * Experience delivering cloud-based REST API solutions
May participate in standards development committees or task groups such as API
May participate in standards development committees or task groups such as API
Post-training techniques for planning, reasoning & complex workflows (e.g., reasoning models, LLMs + knowledge graphs, test time compute, CoT pipelines, tool use & API calling, etc.)
Post-training techniques for planning, reasoning & complex workflows (e.g., reasoning models, LLMs + knowledge graphs, test time compute, CoT pipelines, tool use & API calling, etc.)
Who are we? Look at the latest headlines and you will see something Ki insures. Think space shuttles, world tours, wind farms, and even footballers legs. Kis mission is simple. Digitally disrupt and revolutionise a 335-year-old market. Working with Google and UCL, Ki has created a platform that uses algorithms, machine learning and large language models to give insurance brokers quotes in seconds, rather than days. Ki is proudly the biggest global algorithmic insurance carrier. It is the fastest growing syndicate in the Lloyd's of London market, and the first ever to make $100m in profit in 3 years. Kis teams have varied backgrounds and work together in an agile, cross-functional way to build the very best experience for its customers. Ki has big ambitions but needs more excellent minds to challenge the status-quo and help it reach new horizons. Where you come in?
Who are we? Look at the latest headlines and you will see something Ki insures. Think space shuttles, world tours, wind farms, and even footballers legs. Kis mission is simple. Digitally disrupt and revolutionise a 335-year-old market. Working with Google and UCL, Ki has created a platform that uses algorithms, machine learning and large language models to give insurance brokers quotes in seconds, rather than days. Ki is proudly the biggest global algorithmic insurance carrier. It is the fastest growing syndicate in the Lloyd's of London market, and the first ever to make $100m in profit in 3 years. Kis teams have varied backgrounds and work together in an agile, cross-functional way to build the very best experience for its customers. Ki has big ambitions but needs more excellent minds to challenge the status-quo and help it reach new horizons. Where you come in?
nCino offers exciting career opportunities for individuals who want to join the worldwide leader in cloud banking. As a PreSales Solution Architect you will use your SaaS & Salesforce expertise and work closely with banks and financial institutions to innovate financial services. You will lead the solutioning for business challenges and present and demonstrate the value of the nCino solution. Responsibilities * Be a Trusted Advisor to prospects and clients by leading presales conversations, * presentations and solutioning around nCino-specific architectural design * Be a Thought Leader and provide guidance as it relates to SaaS, cloud infrastructure and AI, especially in relation to financial services * Be a Solution Consultant and lead deep-dive discovery sessions with prospects to identify target solution architecture and advise on best practices to meet functional
nCino offers exciting career opportunities for individuals who want to join the worldwide leader in cloud banking. As a PreSales Solution Architect you will use your SaaS & Salesforce expertise and work closely with banks and financial institutions to innovate financial services. You will lead the solutioning for business challenges and present and demonstrate the value of the nCino solution. Responsibilities * Be a Trusted Advisor to prospects and clients by leading presales conversations, * presentations and solutioning around nCino-specific architectural design * Be a Thought Leader and provide guidance as it relates to SaaS, cloud infrastructure and AI, especially in relation to financial services * Be a Solution Consultant and lead deep-dive discovery sessions with prospects to identify target solution architecture and advise on best practices to meet functional
Our engineering team is dedicated to designing and developing robust backend services and applications that support Macquaries Commodities and Global Markets operations. We work collaboratively across functions to deliver reliable, high-performance solutions, ensuring our systems remain responsive, efficient, and scalable. Our focus is on maintaining code quality, fostering innovation, and continuously improving our technology landscape. While Macquarie offers hybrid working for many of our roles, this role does require 3 days a week in the advertised location. At Macquarie, our advantage is bringing together diverse people and empowering them to shape all kinds of possibilities. We are a global financial services group operating in 31 markets and with 56 years of unbroken profitability. Youll be part of a friendly and supportive team where everyone - no matter what r
Our engineering team is dedicated to designing and developing robust backend services and applications that support Macquaries Commodities and Global Markets operations. We work collaboratively across functions to deliver reliable, high-performance solutions, ensuring our systems remain responsive, efficient, and scalable. Our focus is on maintaining code quality, fostering innovation, and continuously improving our technology landscape. While Macquarie offers hybrid working for many of our roles, this role does require 3 days a week in the advertised location. At Macquarie, our advantage is bringing together diverse people and empowering them to shape all kinds of possibilities. We are a global financial services group operating in 31 markets and with 56 years of unbroken profitability. Youll be part of a friendly and supportive team where everyone - no matter what r
Bicycle Therapeutics is a clinical-stage pharmaceutical company developing a novel class of medicines, referred to as Bicycle molecules, for diseases that are underserved by existing therapeutics. Bicycle molecules are fully synthetic short peptides constrained with small molecule scaffolds to form two loops that stabilize their structural geometry. This constraint facilitates target binding with high affinity and selectivity, making Bicycle molecules attractive candidates for drug development. The company is evaluating zelenectide pevedotin (formerly BT8009), a Bicycle Drug Conjugate (BDC) targeting Nectin-4, a well-validated tumor antigen; BT5528, a BDC molecule targeting EphA2, a historically undruggable target; and BT7480, a Bicycle Tumor-Targeted Immune Cell Agonist (Bicycle TICA) targeting Nectin-4 and agonizing CD137, in company-sponsored clinical trials.
Bicycle Therapeutics is a clinical-stage pharmaceutical company developing a novel class of medicines, referred to as Bicycle molecules, for diseases that are underserved by existing therapeutics. Bicycle molecules are fully synthetic short peptides constrained with small molecule scaffolds to form two loops that stabilize their structural geometry. This constraint facilitates target binding with high affinity and selectivity, making Bicycle molecules attractive candidates for drug development. The company is evaluating zelenectide pevedotin (formerly BT8009), a Bicycle Drug Conjugate (BDC) targeting Nectin-4, a well-validated tumor antigen; BT5528, a BDC molecule targeting EphA2, a historically undruggable target; and BT7480, a Bicycle Tumor-Targeted Immune Cell Agonist (Bicycle TICA) targeting Nectin-4 and agonizing CD137, in company-sponsored clinical trials.
Location * About the job * Benefits * Things you need to know * Apply and further information - Location Westminster, London About the job Job summary - The Digital, Data and Technology (DDAT) directorate has recently been established in UKEF, drawing together the expertise in digital currently within the organisation to provide representation of digital services, user centred design, analytics and technology at the highest levels. The areas with the directorate work closely with all areas of the business such as the Business Group, Operations and Strategy and Policy. UKEF is committed to improving as a customer focussed and led organisation, making it easier for customers to deal with us, offering improved response times, quicker decision-making and improved case-processing. To enable this, UKEF is committed to using digital as a primary means for managing relationsh
Location * About the job * Benefits * Things you need to know * Apply and further information - Location Westminster, London About the job Job summary - The Digital, Data and Technology (DDAT) directorate has recently been established in UKEF, drawing together the expertise in digital currently within the organisation to provide representation of digital services, user centred design, analytics and technology at the highest levels. The areas with the directorate work closely with all areas of the business such as the Business Group, Operations and Strategy and Policy. UKEF is committed to improving as a customer focussed and led organisation, making it easier for customers to deal with us, offering improved response times, quicker decision-making and improved case-processing. To enable this, UKEF is committed to using digital as a primary means for managing relationsh
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About Sibylline - Sibylline is a leading intelligence and strategic risk consultancy in the security sector. Since 2010 we have supported businesses, governments and NGOs by providing high-quality risk analysis, due diligence and consultancy services. The firm provides an innovative, entrepreneurial and fast-growing working environment, offering employees ever greater exposure to high-profile clients and challenges. Sibylline offers fantastic opportunities for career progression within a successful company, and we aim to help our employees build their own personal profiles as well-regarded analysts within the broader industry. * Self-motivated, and auto-improving individuals who can couple initiative and boldness with good judgement * Excellent written and spoken English * Clarity of thought and analytical flair * Strong, demonstrable interest in security and intellig
About Sibylline - Sibylline is a leading intelligence and strategic risk consultancy in the security sector. Since 2010 we have supported businesses, governments and NGOs by providing high-quality risk analysis, due diligence and consultancy services. The firm provides an innovative, entrepreneurial and fast-growing working environment, offering employees ever greater exposure to high-profile clients and challenges. Sibylline offers fantastic opportunities for career progression within a successful company, and we aim to help our employees build their own personal profiles as well-regarded analysts within the broader industry. * Self-motivated, and auto-improving individuals who can couple initiative and boldness with good judgement * Excellent written and spoken English * Clarity of thought and analytical flair * Strong, demonstrable interest in security and intellig
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Location: London - Duration: 6 months, full time - Start: As soon as possible - Why? Statkraft?has been making clean energy possible for over a century. Thats what we offer. 125 years of unrivalled expertise in supplying the world with what it needs most. We envision a world that runs entirely on renewable energy. Because in the fight against climate change, we dont see renewable energy as part of the solution we believe it must be?the?solution. With us, youll shape a career that is truly forward-facing with many amazing opportunities and offerings to match.? But theres more work to be done thats why we need you to join us. Working in Proprietary Trading - The Proprietary Trading department at Statkraft is known for its innovative and data-driven approach, and our team members are expected to have strong analytical and problem-solving skills, as well as a passion for
Location: London - Duration: 6 months, full time - Start: As soon as possible - Why? Statkraft?has been making clean energy possible for over a century. Thats what we offer. 125 years of unrivalled expertise in supplying the world with what it needs most. We envision a world that runs entirely on renewable energy. Because in the fight against climate change, we dont see renewable energy as part of the solution we believe it must be?the?solution. With us, youll shape a career that is truly forward-facing with many amazing opportunities and offerings to match.? But theres more work to be done thats why we need you to join us. Working in Proprietary Trading - The Proprietary Trading department at Statkraft is known for its innovative and data-driven approach, and our team members are expected to have strong analytical and problem-solving skills, as well as a passion for
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At Person Centred Software, were building technology that makes a real difference in the lives of those in care. As a Software Engineer, youll contribute to the design and development of innovative software solutions that improve care outcomes across the UK. If you're passionate about writing clean, scalable code and collaborating within a high-performing, agile team, this is a fantastic opportunity to grow your impact in a meaningful sector. * Write clean, efficient, and maintainable code across the full software development life cycle * Develop front-end and back-end features using Microsoft .NET technologies, including Blazor and .NET Core * Collaborate with product managers and stakeholders to define requirements, acceptance criteria, and effort estimates * Ensure quality by writing unit and behaviour-driven tests (e.g., MS Test/XUnit, Playwright, Appium) for new
At Person Centred Software, were building technology that makes a real difference in the lives of those in care. As a Software Engineer, youll contribute to the design and development of innovative software solutions that improve care outcomes across the UK. If you're passionate about writing clean, scalable code and collaborating within a high-performing, agile team, this is a fantastic opportunity to grow your impact in a meaningful sector. * Write clean, efficient, and maintainable code across the full software development life cycle * Develop front-end and back-end features using Microsoft .NET technologies, including Blazor and .NET Core * Collaborate with product managers and stakeholders to define requirements, acceptance criteria, and effort estimates * Ensure quality by writing unit and behaviour-driven tests (e.g., MS Test/XUnit, Playwright, Appium) for new
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Since being founded in 2018, Copper has been building the standard for institutional digital asset infrastructure with a focus on custody, collateral management, and prime services. Led by Amar Kuchinad, Copper's Global CEO, the firm provides a comprehensive suite of custody, trading and settlement solutions that reduce counterparty risk and bring greater capital and operational efficiency to digital asset markets. At the heart of Copper's offering is Multi-Party Computation (MPC) technology the gold standard in secure custody. Coppers multi-award winning custody system is unique in that it can be connected to centralised exchanges, DeFi applications and even staking pools without the assets leaving the custody. Built on top of this state-of-the-art custody, ClearLoop is the first solution in the market that overcomes a growing industry challenge; counterparty risk wi
Since being founded in 2018, Copper has been building the standard for institutional digital asset infrastructure with a focus on custody, collateral management, and prime services. Led by Amar Kuchinad, Copper's Global CEO, the firm provides a comprehensive suite of custody, trading and settlement solutions that reduce counterparty risk and bring greater capital and operational efficiency to digital asset markets. At the heart of Copper's offering is Multi-Party Computation (MPC) technology the gold standard in secure custody. Coppers multi-award winning custody system is unique in that it can be connected to centralised exchanges, DeFi applications and even staking pools without the assets leaving the custody. Built on top of this state-of-the-art custody, ClearLoop is the first solution in the market that overcomes a growing industry challenge; counterparty risk wi
At Person Centred Software, were building technology that makes a real difference in the lives of those in care. As a Frontend-focused Software Engineer, youll have a passion for User Interfaces and be experienced at working collaboratively with UI/UX designers, as well as Product Managers, Software Engineers, and Testers. You will contribute to the design and development of innovative software solutions that improve care outcomes across the UK. If you're passionate about writing clean, scalable code and collaborating within a high-performing, agile team, this is a fantastic opportunity to grow your impact in a meaningful sector. * Write clean, efficient, and maintainable code across the full software development life cycle * Develop front-end features using Microsoft .NET Blazor, while also contributing across the full-stack
At Person Centred Software, were building technology that makes a real difference in the lives of those in care. As a Frontend-focused Software Engineer, youll have a passion for User Interfaces and be experienced at working collaboratively with UI/UX designers, as well as Product Managers, Software Engineers, and Testers. You will contribute to the design and development of innovative software solutions that improve care outcomes across the UK. If you're passionate about writing clean, scalable code and collaborating within a high-performing, agile team, this is a fantastic opportunity to grow your impact in a meaningful sector. * Write clean, efficient, and maintainable code across the full software development life cycle * Develop front-end features using Microsoft .NET Blazor, while also contributing across the full-stack
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Are you searching for an opportunity to play a key role in driving the dramatic growth of a highly successful software company? At Poppulo, we're working on what's next in communications and workplace technology. As a pioneer in this industry, we understand that meaningfully reaching every employee is hard. And so is managing office space in a hybrid world. And so is improving the customer and guest experience. We exist to make each of these things easier. We exist to bring harmony to our customers. And we do that at enterprise scale. Our omnichannel employee communications, customer communications, and workplace experience platform is trusted by over 6,000 organizations today, reaching more than 35M employees and delivering content to 500,000+ digital signs. We know there's no such thing as a "perfect" candidate - we're all a work in progress and are growing new skil
Are you searching for an opportunity to play a key role in driving the dramatic growth of a highly successful software company? At Poppulo, we're working on what's next in communications and workplace technology. As a pioneer in this industry, we understand that meaningfully reaching every employee is hard. And so is managing office space in a hybrid world. And so is improving the customer and guest experience. We exist to make each of these things easier. We exist to bring harmony to our customers. And we do that at enterprise scale. Our omnichannel employee communications, customer communications, and workplace experience platform is trusted by over 6,000 organizations today, reaching more than 35M employees and delivering content to 500,000+ digital signs. We know there's no such thing as a "perfect" candidate - we're all a work in progress and are growing new skil
Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive infor
Join Proton and build a better internet where privacy is the default - At Proton, we believe that privacy is a fundamental human right and the cornerstone of democracy. Since our inception in 2014, founded by a team of scientists from CERN, we have dedicated ourselves to providing free and open-source technology to millions worldwide, ensuring access to privacy, security, and freedom online. Our journey began with Proton Mail, the largest secure email service globally, and has since expanded to include Proton VPN, Proton Calendar, Proton Drive, and Proton Pass. These tools empower individuals and organizations to take control of their personal data, break away from Big Tech's invasive practices, and defeat censorship. Our work impacts hundreds of millions of lives, from activists on the front lines defending freedom to leaders in governments protecting sensitive infor
Easyship is revolutionizing logistics for eCommerce. With our all-in-one cloud based shipping software, businesses of all shapes and sizes have the tools needed to scale globally. At Easyship we believe in accelerating borderless commerce. We're proud that a diversity of small business owners, crowdfunding campaigns, and global brands trust Easyship as their gateway to the world. To learn more about us click here. Job Title: Head of Product - Level: Head of Department - Location: London - Reports to: Co-Founder - Key Relationships: Product and Engineering teams - We're Easyship, a fast-growing SaaS powerhouse revolutionizing logistics. We operate globally with offices in North America, Europe and Asia. We're on the hunt for a Head of Product who's ready to dominate, hustle hard, and shape the future of global shipping. This isn't a gig for the faint-hearted. Mediocrit
Easyship is revolutionizing logistics for eCommerce. With our all-in-one cloud based shipping software, businesses of all shapes and sizes have the tools needed to scale globally. At Easyship we believe in accelerating borderless commerce. We're proud that a diversity of small business owners, crowdfunding campaigns, and global brands trust Easyship as their gateway to the world. To learn more about us click here. Job Title: Head of Product - Level: Head of Department - Location: London - Reports to: Co-Founder - Key Relationships: Product and Engineering teams - We're Easyship, a fast-growing SaaS powerhouse revolutionizing logistics. We operate globally with offices in North America, Europe and Asia. We're on the hunt for a Head of Product who's ready to dominate, hustle hard, and shape the future of global shipping. This isn't a gig for the faint-hearted. Mediocrit
Castleton Commodities International ( is a global leader in energy commodity trading and asset investment. Our Data Science & Technology team is central to our success, engineering the high-performance data, systems and innovative tools that power our commercial decision-making. We build platforms and forecasts that help our front-office teams understand market behavior, forecast price movements, and manage risk. Our team solves complex, high-impact challenges using a modern technology stack, including the latest in GenAI and the latest technologies. We develop everything in cloud-native infrastructure from structured data and real-time analytics to back testing engines, third party integrations, and internal libraries, all designed to give CCI a competitive edge in global commodities markets.
Castleton Commodities International ( is a global leader in energy commodity trading and asset investment. Our Data Science & Technology team is central to our success, engineering the high-performance data, systems and innovative tools that power our commercial decision-making. We build platforms and forecasts that help our front-office teams understand market behavior, forecast price movements, and manage risk. Our team solves complex, high-impact challenges using a modern technology stack, including the latest in GenAI and the latest technologies. We develop everything in cloud-native infrastructure from structured data and real-time analytics to back testing engines, third party integrations, and internal libraries, all designed to give CCI a competitive edge in global commodities markets.