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        The City, City (EC4)
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        12 API jobs in Amersham + 20 miles

        271 exact matches jobs are outside your preferred location

        Backend Software Engineer (Mid-level)

        Entrust
        London
        Competitive
        Infrastructure: AWS (Aurora, Redis, DynamoDB, S3, SNS, SQS, CloudFront, API Gateway)
        Infrastructure: AWS (Aurora, Redis, DynamoDB, S3, SNS, SQS, CloudFront, API Gateway)
        The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
        The Hoddesdon site has state-of-the-art Good Manufacturing Practice (GMP) standard facilities for the development of Active Pharmaceutical Ingredients (API), Formulation Development (FD) and Process Chemistry (PC).
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        Front-End QA Tester

        REC SOLUTIONS LIMITED
        The City, City of London (EC4), EC4N
        Competitive base Plus Discretionary Bonus and Benefits
        API testing experience (REST/GraphQL) - both automated and manual * Python knowledge (for backend/API testing)
        API testing experience (REST/GraphQL) - both automated and manual * Python knowledge (for backend/API testing)
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        Strong analytical thinking, communication skills, and experience with API-driven or extensible products are essential. * 5+ years as a Product Owner, Technical Product Manager, or similar role in SaaS, platform, API/SDK, or developer-focused products. * Deep knowledge of API-driven development and integration models. * Understanding of versioning, CI/CD pipelines, and open-API ecosystems.
        Strong analytical thinking, communication skills, and experience with API-driven or extensible products are essential. * 5+ years as a Product Owner, Technical Product Manager, or similar role in SaaS, platform, API/SDK, or developer-focused products. * Deep knowledge of API-driven development and integration models. * Understanding of versioning, CI/CD pipelines, and open-API ecosystems.
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        NEW
        The ideal candidate has prior experience solving complex forms of scaled abuse, building sophisticated protections across multiple parts of OpenAIs product suite (ChatGPT, API, Sora).
        The ideal candidate has prior experience solving complex forms of scaled abuse, building sophisticated protections across multiple parts of OpenAIs product suite (ChatGPT, API, Sora).
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        NEW
        Help drive decisions on API design, synchronous vs. asynchronous processing, consistency models, and service boundaries for the broader platform. * AWS Cloud Expertise: Deep architectural knowledge of the AWS ecosystem, such as Lambda, API Gateway, S3, DynamoDB, IAM, and container orchestration (EKS/ECS).
        Help drive decisions on API design, synchronous vs. asynchronous processing, consistency models, and service boundaries for the broader platform. * AWS Cloud Expertise: Deep architectural knowledge of the AWS ecosystem, such as Lambda, API Gateway, S3, DynamoDB, IAM, and container orchestration (EKS/ECS).
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        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.
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        About us - Were an early-stage company operating in stealth, and while were not publicly sharing full details just yet, we can assure you the work ahead is ambitious, meaningful and exciting. As you progress through the hiring process, well share more about our mission, our technology and the team youll be joining. For now, what matters most is finding people who are energised by the pace and possibility of an emerging company and who want to help shape something from the ground up. What We Offer * High-impact environment: Join a company shaping the future of software, working with a team thats redefining how AI meets real-world business needs * Ownership and visibility: In a small, high-performing team, the impact of your work isnt theoretical, it actively shapes the companys direction * Empowerment through innovation: Use cutting-edge AI tools internally.
        About us - Were an early-stage company operating in stealth, and while were not publicly sharing full details just yet, we can assure you the work ahead is ambitious, meaningful and exciting. As you progress through the hiring process, well share more about our mission, our technology and the team youll be joining. For now, what matters most is finding people who are energised by the pace and possibility of an emerging company and who want to help shape something from the ground up. What We Offer * High-impact environment: Join a company shaping the future of software, working with a team thats redefining how AI meets real-world business needs * Ownership and visibility: In a small, high-performing team, the impact of your work isnt theoretical, it actively shapes the companys direction * Empowerment through innovation: Use cutting-edge AI tools internally.
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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
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        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
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        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.
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        Hi, were Bloom & Wild. We dont just send flowers. We help our customers to care wildly. Caring wildly is celebrating the little things we all do for each other every day. Not just the big occasions. Its being there for the highs. Stepping up for the lows. We care wildly about people and our planet. Which is why were so proud to be a certified B Corp committed to making long-term positive change for our community, and the world around us. Founded in 2013, our mission back then was to make sending and receiving flowers the joy that it should be, by harnessing technology, brand and letterbox delivery. We announced £75 million Series D funding in 2021 and that same year acquired bloomon in The Netherlands and Bergamotte in France. Together, weve fulfilled and delivered over 20 million orders (and counting!), making us the largest direct to consumer flower business in Euro
        Hi, were Bloom & Wild. We dont just send flowers. We help our customers to care wildly. Caring wildly is celebrating the little things we all do for each other every day. Not just the big occasions. Its being there for the highs. Stepping up for the lows. We care wildly about people and our planet. Which is why were so proud to be a certified B Corp committed to making long-term positive change for our community, and the world around us. Founded in 2013, our mission back then was to make sending and receiving flowers the joy that it should be, by harnessing technology, brand and letterbox delivery. We announced £75 million Series D funding in 2021 and that same year acquired bloomon in The Netherlands and Bergamotte in France. Together, weve fulfilled and delivered over 20 million orders (and counting!), making us the largest direct to consumer flower business in Euro
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        NEW
        insightsoftware is a global provider of comprehensive solutions for the Office of the CFO. We believe an actionable business strategy begins and ends with accessible financial data. With solutions across financial planning and analysis (FP&A), accounting, and operations, we transform how teams operate, empowering leaders to make timely and informed decisions. With data at the heart of everything we do, insightsoftware enables automated processes, delivers trusted insights, boosts predictability, and increases productivity. Job Description - The Senior Product Manager is the leader and end-to-end owner for a product line within our portfolio of Enterprise Performance Management solutions - and is dedicated to driving its profitable growth with a metrics-driven mindset. This role is responsible for driving the overall product vision and market strategy, business cases,
        insightsoftware is a global provider of comprehensive solutions for the Office of the CFO. We believe an actionable business strategy begins and ends with accessible financial data. With solutions across financial planning and analysis (FP&A), accounting, and operations, we transform how teams operate, empowering leaders to make timely and informed decisions. With data at the heart of everything we do, insightsoftware enables automated processes, delivers trusted insights, boosts predictability, and increases productivity. Job Description - The Senior Product Manager is the leader and end-to-end owner for a product line within our portfolio of Enterprise Performance Management solutions - and is dedicated to driving its profitable growth with a metrics-driven mindset. This role is responsible for driving the overall product vision and market strategy, business cases,
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        A newly created exciting opportunity to join the PIM (Pension Investment Management) team as the Head of PIM Engineering . This is a permanent opportunity based in our London office (hybrid working). Who we are - Railpen is responsible for the safekeeping and investment of around £34 billion in assets and the administration of several pension schemes, including the Railways Pension Scheme, one of the UK's largest and longest established pension funds. Our heritage of looking after the pension needs of the rail industry and its employees gives us our name and our unique outlook on how we serve our members. Railpen takes a holistic view, focusing on how we serve members today and how we can positively impact the communities and the world they will retire into. To learn more about Railpen including our values, culture and purpose, visit our LinkedIn Life page here. The r
        A newly created exciting opportunity to join the PIM (Pension Investment Management) team as the Head of PIM Engineering . This is a permanent opportunity based in our London office (hybrid working). Who we are - Railpen is responsible for the safekeeping and investment of around £34 billion in assets and the administration of several pension schemes, including the Railways Pension Scheme, one of the UK's largest and longest established pension funds. Our heritage of looking after the pension needs of the rail industry and its employees gives us our name and our unique outlook on how we serve our members. Railpen takes a holistic view, focusing on how we serve members today and how we can positively impact the communities and the world they will retire into. To learn more about Railpen including our values, culture and purpose, visit our LinkedIn Life page here. The r
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        Frequently Asked Questions

        How many API jobs are there in Amersham?
        There are 12 API jobs within 20 miles of Amersham available on CWJobs right now.

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