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- The City, City (EC3)
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73 Contract API jobs in City of London + 20 miles
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Workplace Platform Engineer (DocuSign & 365 & API)
Workplace Platform Engineer (DocuSign & 365 & API)
Morson Edge
City of London, London, EC1A 1AA
Market related
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
PREMIUM
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Senior Full Stack Engineer
Senior Full Stack Engineer
RSMB
Covent Garden, Central London (WC2), WC2B
Up to £85k, based on experience
RSMB is seeking an experienced and highly capable Senior Full Stack Engineer to play a central role in the design, development, and evolution of our expanding product suite, including Barb Ads Hub, NMO XCM, and our Data Fusion platform. You will join the team based in London (Hybrid – 2 days per week in the office). Youwill join us on a full-time, permanent basis, and in return, you will receive a competitive salary of up to £85,000 per annum, based on experience. RSMB is a leading company specialising in media measurement solutions. We work with a wide range of clients delivering both long-term contracts like Barb (UK TV audience measurement) and RAJAR (Radio audience measurement), and ad hoc projects. We are proud that we have been a Barb TV audience measurement contractor since 1989 and a RAJAR contractor since 2007.
RSMB is seeking an experienced and highly capable Senior Full Stack Engineer to play a central role in the design, development, and evolution of our expanding product suite, including Barb Ads Hub, NMO XCM, and our Data Fusion platform. You will join the team based in London (Hybrid – 2 days per week in the office). Youwill join us on a full-time, permanent basis, and in return, you will receive a competitive salary of up to £85,000 per annum, based on experience. RSMB is a leading company specialising in media measurement solutions. We work with a wide range of clients delivering both long-term contracts like Barb (UK TV audience measurement) and RAJAR (Radio audience measurement), and ad hoc projects. We are proud that we have been a Barb TV audience measurement contractor since 1989 and a RAJAR contractor since 2007.
PREMIUM
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Contract .Net Developer – Insurance claims system
Contract .Net Developer – Insurance claims system
Hireful
Central London, London
£400 per day outside IR35
We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
FEATURED
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Digital Platform Architect (power platform)
Digital Platform Architect (power platform)
MORGAN PHILIPS UK LIMITED
City of London (EC1)
£60000 - £70000 per annum
Undertake development of customising Dataverse, canvas apps, API integrations with 3rd party systems.
Undertake development of customising Dataverse, canvas apps, API integrations with 3rd party systems.
Full Stack Engineer - Equity
Full Stack Engineer - Equity
Dental startup
Central London (W1)
Up to £60,000 per annum Equity - Founding Engineer
You'll own the full stack database architecture, API layer, and front-end, and you'll work directly with the founder on every major decision. * Architect and build the core platform from scratch schema, API, and front-end * Strong Node.js REST API development, authentication, middleware * Third-party API and webhook integration experience
You'll own the full stack database architecture, API layer, and front-end, and you'll work directly with the founder on every major decision. * Architect and build the core platform from scratch schema, API, and front-end * Strong Node.js REST API development, authentication, middleware * Third-party API and webhook integration experience
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Back End Integration Engineer - Azure
Back End Integration Engineer - Azure
I3 Resourcing Limited
The City, City of London (EC3), EC3V 3ND
£600 - £700 per day + Outside IR35
Azure API Management (APIM)
Azure API Management (APIM)
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Lead Integration Architect - 12 Months Contract Outside IR35 £600 to £650 a day - 3 days a week in Dartford Kent - A global powerhouse in the Infrastructure and Built Environment sector is urgently seeking a visionary Integration Architect to spearhead the connectivity for a multi-million-pound Digital Manufacturing Cloud (DMC) transformation. This isn't a maintenance role. You will own the entire integration architecture, acting as the master orchestrator for a complex ecosystem. You will ensure that high-level ERP and HR systems communicate perfectly with the precision-engineered data flows of PLM, MES, and QMS platforms. As an integration Architect you will have the following responsibilities * Define the integration architecture that allows disparate enterprise systems to speak a single, fluent language.
Lead Integration Architect - 12 Months Contract Outside IR35 £600 to £650 a day - 3 days a week in Dartford Kent - A global powerhouse in the Infrastructure and Built Environment sector is urgently seeking a visionary Integration Architect to spearhead the connectivity for a multi-million-pound Digital Manufacturing Cloud (DMC) transformation. This isn't a maintenance role. You will own the entire integration architecture, acting as the master orchestrator for a complex ecosystem. You will ensure that high-level ERP and HR systems communicate perfectly with the precision-engineered data flows of PLM, MES, and QMS platforms. As an integration Architect you will have the following responsibilities * Define the integration architecture that allows disparate enterprise systems to speak a single, fluent language.
FEATURED
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A strong background in API integrations and data pipelines across REST, JSON, XML and JDBC
A strong background in API integrations and data pipelines across REST, JSON, XML and JDBC
NEW
Integration and API testing across Salesforce, SAP, and downstream systems
Integration and API testing across Salesforce, SAP, and downstream systems
You’ll bring hands-on expertise in building and maintaining scalable automation frameworks at both end-to-end and API levels, ensuring high-quality delivery through risk-based testing and rapid feedback loops.
You’ll bring hands-on expertise in building and maintaining scalable automation frameworks at both end-to-end and API levels, ensuring high-quality delivery through risk-based testing and rapid feedback loops.
NEWFEATURED
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Working across API, UI, and integration testing
Working across API, UI, and integration testing
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API integration
API integration
PREMIUM
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Lead Mobile Engineer KMP - Wellness
Lead Mobile Engineer KMP - Wellness
Client Server
Shoreditch, East London (E1), EC2A
£90000 - £110000 per annum + benefits
You'll work on business logic, networking, domain layers and API integrations, collaborating closely with backend engineers, product, design and QA to deliver end-to-end features whilst mentoring more junior engineers. * You have API integration experience
You'll work on business logic, networking, domain layers and API integrations, collaborating closely with backend engineers, product, design and QA to deliver end-to-end features whilst mentoring more junior engineers. * You have API integration experience
PREMIUM
API Automation (REST Assured, Karate, Postman)
API Automation (REST Assured, Karate, Postman)
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Understanding of AI integrations including LLM services and API-driven automation * API Management, OAuth2, JWT, audit logging
Understanding of AI integrations including LLM services and API-driven automation * API Management, OAuth2, JWT, audit logging
Lead Software Engineer Ruby TypeScript React
Lead Software Engineer Ruby TypeScript React
Client Server
Shoreditch, East London (E1), EC2A
£100000 - £130000 per annum + stock options + benefits
Are you a polyglot Software Engineer with Developer Experience, API / SDK development skills? As a Lead Software Engineer you'll own the technical strategy and architecture for one or more Developer Ecosystems (iOS, Web, Infra/Automation), define and drive best practices for API and SDK design, ensuring consistency, usability and scalability and lead complex, cross-team initiatives to expand and improve client libraries.
Are you a polyglot Software Engineer with Developer Experience, API / SDK development skills? As a Lead Software Engineer you'll own the technical strategy and architecture for one or more Developer Ecosystems (iOS, Web, Infra/Automation), define and drive best practices for API and SDK design, ensuring consistency, usability and scalability and lead complex, cross-team initiatives to expand and improve client libraries.
PREMIUM
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Experience with infrastructure-as-code, production-grade Linux environments, and API services (Flask/Gunicorn).
Experience with infrastructure-as-code, production-grade Linux environments, and API services (Flask/Gunicorn).
FEATURED
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Software Automation QA
Software Automation QA
Profile 29
Loughton (IG10), IG10
From £50,000 to £60,000 per annum + benefits (see advert)
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
Conduct comprehensive testing of various API's used by affiliates and other third-party service providers
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Experience with REST or SOAP API integrations and SFTP-based data pipelines
Experience with REST or SOAP API integrations and SFTP-based data pipelines
NEW
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Backend Developer - Java
Backend Developer - Java
Infoplus Technologies UK Ltd
The City, City of London (EC3), EC4R 9AA
Unspecified
Role: Backend Developer - Java - Location: Edinburgh / London, UK - Duration: Contract - Your Profile * 510 years of overall software development experience, with minimum 4+ years of hands on Java development * Strong experience with Java 9+ * Proven expertise in Spring Framework (Spring Boot, Spring MVC, Spring Core) * Hands on experience building backend services and APIs and Microservices * Solid understanding of object oriented design, design patterns, and clean code principles * Experience working in Agile / Scrum environments * Strong problem solving and debugging skills * Ability to work effectively in distributed, multi team environments * Experience with SaaS based architectures * Exposure to event driven architecture (Kafka, JMS, or equivalent) * Experience with system integration and enterprise messaging * Knowledge of cloud platforms (GCP preferred)
Role: Backend Developer - Java - Location: Edinburgh / London, UK - Duration: Contract - Your Profile * 510 years of overall software development experience, with minimum 4+ years of hands on Java development * Strong experience with Java 9+ * Proven expertise in Spring Framework (Spring Boot, Spring MVC, Spring Core) * Hands on experience building backend services and APIs and Microservices * Solid understanding of object oriented design, design patterns, and clean code principles * Experience working in Agile / Scrum environments * Strong problem solving and debugging skills * Ability to work effectively in distributed, multi team environments * Experience with SaaS based architectures * Exposure to event driven architecture (Kafka, JMS, or equivalent) * Experience with system integration and enterprise messaging * Knowledge of cloud platforms (GCP preferred)
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Director of Technical Delivery
Director of Technical Delivery
Wilmington
City of London (EC4R)
Circa £100,000 - £110,000 (DoE) + 15% bonus
Strong expertise in composable, microservice-based architectures, including API design, event-driven integration, and service decomposition - Proven track record delivering large-scale platform integration or migration programmes across complex, multi-system and multi-vendor environments, including API integration, data migration, identity consolidation, release management, and cutover execution
Strong expertise in composable, microservice-based architectures, including API design, event-driven integration, and service decomposition - Proven track record delivering large-scale platform integration or migration programmes across complex, multi-system and multi-vendor environments, including API integration, data migration, identity consolidation, release management, and cutover execution
FEATURED
Senior Python Developer Data AWS
Senior Python Developer Data AWS
Client Server
The City, City of London (EC4), EC4R
£75000 - £90000 per annum + benefits
Senior Python Developer / Backend Software Engineer (Python Data AWS) London / WFH to £90k - Are you a Senior Python Developer with data engineering skills? You could be progressing your career in a hands-on Senior Python Developer role at a scaling Fintech who have built a highly complex, real-time energy trading platform to revolutionise energy buying for large industrial and commercial users. As a Senior Python Developer you'll help to build a seamless digital experience that makes complex energy systems simple, powerful and intuitive. You'll be building resilient, modular backend services, data models, data flows between Postgres, Redshift, analytics layers and APIs that underpin complex trading, billing and analytics platforms. There's a collaborative team environment where you'll input into technical discussions and decision making.
Senior Python Developer / Backend Software Engineer (Python Data AWS) London / WFH to £90k - Are you a Senior Python Developer with data engineering skills? You could be progressing your career in a hands-on Senior Python Developer role at a scaling Fintech who have built a highly complex, real-time energy trading platform to revolutionise energy buying for large industrial and commercial users. As a Senior Python Developer you'll help to build a seamless digital experience that makes complex energy systems simple, powerful and intuitive. You'll be building resilient, modular backend services, data models, data flows between Postgres, Redshift, analytics layers and APIs that underpin complex trading, billing and analytics platforms. There's a collaborative team environment where you'll input into technical discussions and decision making.
PREMIUM
Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
FEATURED
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Your new company - This is a globally renowned financial institution with an office based in the City of London. Your new role - You will take a leading role in developing and operating advanced network observability and telemetry solutions for high-performance financial systems. A key focus will be driving automation-led troubleshooting and analytics, turning network data into actionable insight that improves stability and reduces recovery time. Alongside this, you'll provide senior technical leadership, supporting incident response, engineering standards, and long-term resilience initiatives. What you'll need to succeed * Deep expertise in network observability and telemetry, including large-scale SNMP, NetFlow/IPFIX, syslog, and streaming/model-driven telemetry. * Strong experience designing and running enterprise observability platforms, using tools such as SevOne, ...
Your new company - This is a globally renowned financial institution with an office based in the City of London. Your new role - You will take a leading role in developing and operating advanced network observability and telemetry solutions for high-performance financial systems. A key focus will be driving automation-led troubleshooting and analytics, turning network data into actionable insight that improves stability and reduces recovery time. Alongside this, you'll provide senior technical leadership, supporting incident response, engineering standards, and long-term resilience initiatives. What you'll need to succeed * Deep expertise in network observability and telemetry, including large-scale SNMP, NetFlow/IPFIX, syslog, and streaming/model-driven telemetry. * Strong experience designing and running enterprise observability platforms, using tools such as SevOne, ...
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Front-End Developer (React and React Native)
Front-End Developer (React and React Native)
Foresters Financial
Bromley (BR2), BR2 9BF
Competitive salary
Competitive salary - Bromley, Kent - Fixed Term Contract (12 Months) Were looking for an experienced Frontend Developer (React & React Native) to join our Digital Solutions team on a 12-month fixed-term contract. In this hands-on role, youll play a key part in growing our digital platform, delivering intuitive omni-channel services for our customers, and enhancing the workflows and systems that support our customer-facing teams. Youll be involved across the full development lifecycle from collaborating with the business to understand customer needs, through design and build, to testing and release. Strong React and React Native expertise, a passion for clean, scalable front-end development, and a customer-first mindset will be critical to your success. What you will do * Design, build and maintain web applications using React
Competitive salary - Bromley, Kent - Fixed Term Contract (12 Months) Were looking for an experienced Frontend Developer (React & React Native) to join our Digital Solutions team on a 12-month fixed-term contract. In this hands-on role, youll play a key part in growing our digital platform, delivering intuitive omni-channel services for our customers, and enhancing the workflows and systems that support our customer-facing teams. Youll be involved across the full development lifecycle from collaborating with the business to understand customer needs, through design and build, to testing and release. Strong React and React Native expertise, a passion for clean, scalable front-end development, and a customer-first mindset will be critical to your success. What you will do * Design, build and maintain web applications using React
FEATURED
Related Jobs
Locations
- The City, City (EC3)
- Shoreditch
- Moorgate
- Blackfriars
- Chilton
- Covent Garden
- Euston
- Fenny Lock
- Granby Industrial Estate
- Grays Inn
- City of London
- Cambridge
- Central London
- East London
- West End
- Milton Keynes
- Dartford
- Wokingham
- Reading
- Basingstoke
- London
- Cambridgeshire
- Berkshire
- Kent
- Buckinghamshire
- Oxfordshire
- Essex
- East Sussex
- Hampshire
- Hertfordshire
- South East
- East Anglia