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Locations
Locations
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Date posted
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148 API jobs in The City, City of London + 20 miles
668 exact matches jobs are outside your preferred location
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Senior Software Developer Python (SC Cleared)
Senior Software Developer Python (SC Cleared)
Certes IT Service Solutions
London
£625 - £650 per day + Negotiable
Work within a multi-disciplinary product team and lead decisions on development and maintenance of a robust, scalable open data website (front end and back end); it's services and API's.
Work within a multi-disciplinary product team and lead decisions on development and maintenance of a robust, scalable open data website (front end and back end); it's services and API's.
NEW
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Scripting or API familiarity to support platform integrations (JSON, REST APIs).
Scripting or API familiarity to support platform integrations (JSON, REST APIs).
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Basic understanding of ServiceNow scripting (JavaScript, Glide API) to effectively debug and analyse issues.
Basic understanding of ServiceNow scripting (JavaScript, Glide API) to effectively debug and analyse issues.
FEATURED
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Experience with microservices, OAuth2/OpenID Connect, API Gateway
Experience with microservices, OAuth2/OpenID Connect, API Gateway
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Senior Software Engineer - C++
Senior Software Engineer - C++
MaxAd
Causeway, Petersfield (GU31), GU31
£58000.00 - £63000.00 per annum + Excellent Benefits
API fundamentals * Python and Bash
API fundamentals * Python and Bash
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Maintain and administer DevOps toolchain components including Git, Artifactory, SonarQube, and API-based scripting solutions. Proficiency in Git, Artifactory, SonarQube, and API scripting.
Maintain and administer DevOps toolchain components including Git, Artifactory, SonarQube, and API-based scripting solutions. Proficiency in Git, Artifactory, SonarQube, and API scripting.
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Strong focus on optimizing inference performance and cost (e.g., model compression, quantization, API optimization).
Strong focus on optimizing inference performance and cost (e.g., model compression, quantization, API optimization).
FEATURED
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Design, build and maintain data-intensive web applications and API-driven systems
Design, build and maintain data-intensive web applications and API-driven systems
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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
Intricately collaborate with technical product managers and engineering leads in driving an API-first solution focusing on ledger management, FX conversion, wallets, reconciliation and payouts - Provide track record in API and payments product management ideally within Fintech, financial services and/or related B2B sectors
Intricately collaborate with technical product managers and engineering leads in driving an API-first solution focusing on ledger management, FX conversion, wallets, reconciliation and payouts - Provide track record in API and payments product management ideally within Fintech, financial services and/or related B2B sectors
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Secure-Linux tools & API libraries.
Secure-Linux tools & API libraries.
Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
Play a significant role in the design and development of our full system with embedded HSMs, client-side tools & API libraries * Familiarity with full-stack from device drivers, to client-side tools & API libraries. (Some knowledge of hardware protocols.)
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Senior Developer SPA Web
Senior Developer SPA Web
Opus Enterprise Ltd T/A Real Recruitment
Milton Keynes (MK10)
Excellent salary and benefits package
Rest-based API interactions
Rest-based API interactions
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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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Experience with API development and integration
Experience with API development and integration
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Responsibilities include API development, system integration, dataoptimization, and performance tuning.
Responsibilities include API development, system integration, dataoptimization, and performance tuning.
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Remote Head of AI Software Development - Python, Azure, AI Platform
Remote Head of AI Software Development - Python, Azure, AI Platform
Recruitment Revolution
Reading (RG1), RG1
Competitive Salary Plus Benefits
• Shape the platform architecture, ensuring scalable, secure, cloud-native design across AI, data, and API layers.
• Shape the platform architecture, ensuring scalable, secure, cloud-native design across AI, data, and API layers.
Principal Developer C# & Azure
Principal Developer C# & Azure
Opus Enterprise Ltd T/A Real Recruitment
Milton Keynes (MK10)
Excellent salary and benefits package
Azure AI Search, using API and designing indexes - Azure AD, Enterprise apps and interactions via Graph API Data sources: via ODBC, RESTful API, Message-based Architectures
Azure AI Search, using API and designing indexes - Azure AD, Enterprise apps and interactions via Graph API Data sources: via ODBC, RESTful API, Message-based Architectures
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Lead .Net Software Developer
Lead .Net Software Developer
Hireful
Milton Keynes, Buckinghamshire, MK9
£65k - £75k base salary + bonus and great benefits
Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
Are you a hands-on Lead or Senior .Net Developer ready to shape architecture and guide talented developers? Want a hybrid role with 3 days WFH? This is your chance to stay close to the code while making key technical decisions that drive real business impact. You'll join a collaborative, forward-thinking team building cutting-edge products — with the support, tools, and flexibility to thrive. Role: Lead Software Developer, Senior .Net Developer, Software Engineering Manager, Senior Full Stack Developer, Lead .Net Developer, Lead Software Engineer, Senior C# Developer - Salary: £65k - £75k base + Bonus - Benefits: 5% pension, 25 days holiday, 2 wellbeing days, Christmas shutdown, private healthcare, life assurance, cinema tickets & more - Location: Milton Keynes – Hybrid (2 days a week in office) If you’ve got strong .Net (C#) experience and skills in GitHub, APIs, Pos
FEATURED
Familiarity with distributed systems and API design
Familiarity with distributed systems and API design
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Knowledge of automation and digital tools such as Dynamo, Power BI, Python, or Revit API is desirable.
Knowledge of automation and digital tools such as Dynamo, Power BI, Python, or Revit API is desirable.
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Principal Software Engineer - Unified Client Experience (UCX)
Principal Software Engineer - Unified Client Experience (UCX)
Hargreaves Lansdown
London
£11500 - £90000 per annum + Generous bonus, pension, PMI & more
Deep expertise in React or React Native, with hands-on experience in secure API integration, authentication flows, and frontend architecture.
Deep expertise in React or React Native, with hands-on experience in secure API integration, authentication flows, and frontend architecture.
NEWFEATURED
Software Engineering Manager - Unified Client Experience (UCX)
Software Engineering Manager - Unified Client Experience (UCX)
Hargreaves Lansdown
London
£90000 - £115000 per annum + Generous bonus, pension, PMI and more
Strong understanding of secure API integration, authentication flows, and modern UI/UX architecture.
Strong understanding of secure API integration, authentication flows, and modern UI/UX architecture.
NEWFEATURED
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.
Demonstrated technical fluency with cloud-native architectures (e.g., AWS, GCP, Azure), API design, and the infrastructure required to serve and scale LLM-based applications.