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1,217 API jobs in South East + 10 miles
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C# Developer .Net Azure API
C# Developer .Net Azure API
Client Server
The City, City of London (EC4), EC4N
£80000 - £95000 per annum + benefits
C# Developer / Backend Software Engineer (.Net Azure API) London / WFH to £90k * You have strong REST API and integration experience - Apply now to find out more about this C# Developer / Backend Software Engineer (.Net Azure API) opportunity.
C# Developer / Backend Software Engineer (.Net Azure API) London / WFH to £90k * You have strong REST API and integration experience - Apply now to find out more about this C# Developer / Backend Software Engineer (.Net Azure API) opportunity.
PREMIUM
Software Engineer Java API SpringBoot AWS
Software Engineer Java API SpringBoot AWS
Client Server
City of London (EC2A), EC2A
£80000 - £90000 per annum
Software Engineer / Developer (Java SpringBoot AWS) London / WFH to £90k - Are you a Java technologist seeking a role where you can work on ground breaking technology, continually learning and progressing your career? You could be joining a global technology consultancy. As a Software Engineer you will design, develop and deliver a range of transformational projects for clients, mainly within the financial services sector and with a focus on migrating legacy systems to AWS and introducing CI/CD pipelines and cloud deployments. You'll join a collaborative team with a focus on engineering best practice and continuous improvement of client systems; you will have lots of business and client exposure and continual learning and development opportunities. There's a hybrid work from home policy with three days a week in the London, City office (or at client sites), you'll join a ...
Software Engineer / Developer (Java SpringBoot AWS) London / WFH to £90k - Are you a Java technologist seeking a role where you can work on ground breaking technology, continually learning and progressing your career? You could be joining a global technology consultancy. As a Software Engineer you will design, develop and deliver a range of transformational projects for clients, mainly within the financial services sector and with a focus on migrating legacy systems to AWS and introducing CI/CD pipelines and cloud deployments. You'll join a collaborative team with a focus on engineering best practice and continuous improvement of client systems; you will have lots of business and client exposure and continual learning and development opportunities. There's a hybrid work from home policy with three days a week in the London, City office (or at client sites), you'll join a ...
PREMIUM
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Principal Software Engineer
Principal Software Engineer
Spectrum It Recruitment Limited
Southampton (SO14)
£70000.00 - £75000.00 per annum
Southampton (Onsite) * £75,000 + generous pension & benefits - Are you a Principal Engineer who thrives on solving real-world problems with cutting-edge technology? This is an opportunity to join a talented engineering team building advanced, real-time software systems used in safety-critical environments worldwide. You'll be working at the intersection of enterprise software, IoT, and data-driven decision-making; developing solutions that genuinely make a difference. Why this role is exciting - This isn't just another enterprise software role. You'll be working on a sophisticated platform that connects physical devices (IoT) with real-time data processing, delivering actionable insights through modern web applications. The systems you help build are deployed globally and play a vital role in protecting people, infrastructure, and national security.
Southampton (Onsite) * £75,000 + generous pension & benefits - Are you a Principal Engineer who thrives on solving real-world problems with cutting-edge technology? This is an opportunity to join a talented engineering team building advanced, real-time software systems used in safety-critical environments worldwide. You'll be working at the intersection of enterprise software, IoT, and data-driven decision-making; developing solutions that genuinely make a difference. Why this role is exciting - This isn't just another enterprise software role. You'll be working on a sophisticated platform that connects physical devices (IoT) with real-time data processing, delivering actionable insights through modern web applications. The systems you help build are deployed globally and play a vital role in protecting people, infrastructure, and national security.
NEW
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We are seeking a Java API Developer to join our Digital Asset development team. * Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable. * Collaborate with business and technology stakeholders to understand requirements, clarify edge cases, and deliver well-scoped API changes in an Agile sprint model. * Hands-on experience developing Java backend applications, including REST API development in production or near-production environments. * Familiarity with common Java API frameworks and patterns (e.g., Spring Boot / Spring MVC-style services) and building maintainable service layers. * Understanding of secure API fundamentals (authentication/authorization concepts, safe handling of sensitive data) and willingness to follow enterprise standards.
We are seeking a Java API Developer to join our Digital Asset development team. * Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable. * Collaborate with business and technology stakeholders to understand requirements, clarify edge cases, and deliver well-scoped API changes in an Agile sprint model. * Hands-on experience developing Java backend applications, including REST API development in production or near-production environments. * Familiarity with common Java API frameworks and patterns (e.g., Spring Boot / Spring MVC-style services) and building maintainable service layers. * Understanding of secure API fundamentals (authentication/authorization concepts, safe handling of sensitive data) and willingness to follow enterprise standards.
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
C# Software Engineer Azure - Fitness
C# Software Engineer Azure - Fitness
Client Server
The City, City of London (EC4), EC4N
£80000 - £90000 per annum + benefits
C# Software Engineer / Developer (Azure API) London / WFH to £90k * You have strong REST API and integration experience - Apply now to find out more about this C# Software Engineer / Developer (Azure API) opportunity.
C# Software Engineer / Developer (Azure API) London / WFH to £90k * You have strong REST API and integration experience - Apply now to find out more about this C# Software Engineer / Developer (Azure API) opportunity.
PREMIUM
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands-on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilitiesspanning digital custody, tokenization enablement, digital transfer agency, and digital cash/settlement workflows. * Build API services that participate in the platforms centralized integration approachsupporting client/app onboarding and app-to-service integrations via an Integration Hub and secure gateways. * Implement APIs that align to enterprise API design/security/publishing requirements, ensuring designs are review-ready and compliant with internal standards (security, documentation, and platform requirements). * Collaborate across teams to drive clear API contracts and dependencies for integrations to traditional ...
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Full Stack Developer (FinTech/ Insurance)
Full Stack Developer (FinTech/ Insurance)
Ernest Gordon Recruitment
Basildon (SS13)
£45000 - £55000 per annum + Training, Progression, Company Benefit,
Basildon - Hybrid £45,000 - £55,000 + Training + Progression + Healthcare Coverage + Benefits - Are you a Full Stack Developer with a strong front-end focus, looking to join a talented team building cutting-edge websites for global FinTech clients, using modern technologies and receiving great training to support your progression into a senior role? Are you looking to join a company that genuinely invests in your future, with unlimited training opportunities and a best-in-class e-learning platform designed to keep you ahead of the curve in a fast-evolving tech landscape? This company have become a true disruptor in the insurance industry, seamlessly blending cutting-edge technology with every aspect of the sector. Their intelligent automation solutions are helping insurance firms stay agile, competitive, and efficient by streamlining traditionally time-consuming processes.
Basildon - Hybrid £45,000 - £55,000 + Training + Progression + Healthcare Coverage + Benefits - Are you a Full Stack Developer with a strong front-end focus, looking to join a talented team building cutting-edge websites for global FinTech clients, using modern technologies and receiving great training to support your progression into a senior role? Are you looking to join a company that genuinely invests in your future, with unlimited training opportunities and a best-in-class e-learning platform designed to keep you ahead of the curve in a fast-evolving tech landscape? This company have become a true disruptor in the insurance industry, seamlessly blending cutting-edge technology with every aspect of the sector. Their intelligent automation solutions are helping insurance firms stay agile, competitive, and efficient by streamlining traditionally time-consuming processes.
FEATURED
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Define API usage, events, payloads, and sequencing
Define API usage, events, payloads, and sequencing
Formal training or certification on API Management Platform concepts and proficient advanced experience * Professional experience in API management technology e.g APIGEE, Kong, Mulesoft * Kong API Gateway
Formal training or certification on API Management Platform concepts and proficient advanced experience * Professional experience in API management technology e.g APIGEE, Kong, Mulesoft * Kong API Gateway
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Senior Data Scientist - 12 Month FTC
Senior Data Scientist - 12 Month FTC
Vitality Corporate Services Limited
Charing Cross, Central London (WC2), WC2R
£Competitive + Bonus + Benefits
Strong understanding of API development, microservices, and containerization (Docker, Kubernetes)
Strong understanding of API development, microservices, and containerization (Docker, Kubernetes)
PREMIUM
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The postholder will utilise skills in Microsoft Fabric, ETL pipeline development, API integration and data orchestration to ensure interoperability and efficient access to data from a wide variety of internal and external sources. Identify, design and deliver secure and reliable API integrations to enable efficient data exchange between systems and services, supporting improved accessibility, automation and interoperability across the Force. Apply expert knowledge of API standards, authentication protocols and data sharing practices to ensure integrations adhere to Information Security requirements, organisational policies and national policing frameworks. Engage in regular contact with senior business leaders, data owners and technical stakeholders to understand their requirements, advising on how API driven solutions can enhance operational capability and service delivery.
The postholder will utilise skills in Microsoft Fabric, ETL pipeline development, API integration and data orchestration to ensure interoperability and efficient access to data from a wide variety of internal and external sources. Identify, design and deliver secure and reliable API integrations to enable efficient data exchange between systems and services, supporting improved accessibility, automation and interoperability across the Force. Apply expert knowledge of API standards, authentication protocols and data sharing practices to ensure integrations adhere to Information Security requirements, organisational policies and national policing frameworks. Engage in regular contact with senior business leaders, data owners and technical stakeholders to understand their requirements, advising on how API driven solutions can enhance operational capability and service delivery.
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Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
Manage and optimize Akamai security suites including: WAF, L7 Anti DDoS, Bot Manager Premier, API Security, Site Shield, API Acceleration. Akamai certifications (WAF, DDoS, Bot Manager, API Protector, Site Shield) are a strong plus.
Full Stack Software Developer
Full Stack Software Developer
Spectrum It Recruitment Limited
Portsmouth (PO1)
£45000 - £50000 per annum + Benefits
They want to take an API first approach and build this out in .NET. and new front ends in Vue.
They want to take an API first approach and build this out in .NET. and new front ends in Vue.
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Microservices architecture and REST API development
Microservices architecture and REST API development
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Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * Experience with API authentication and authorization mechanisms (e.g. OAuth, JWT).
Deliver high efficiency, high availability, concurrent and fault tolerant software systems using API-First principles. * Experience with API authentication and authorization mechanisms (e.g. OAuth, JWT).
NEW
About this role - You will be at the heart of BlackRock's Aladdin, building the platform that drives our and our clients investment and trading operations. Each day, you will design, develop, and maintain scalable web applications and high-performance APIs, collaborating closely with traders, product managers, and fellow engineers to define requirements and deliver impactful solutions. Your role will involve troubleshooting technical challenges, optimizing microservices and data pipelines, and continuously researching new technologies to enhance system performance. By mentoring junior engineers and contributing to our team culture, youll help ensure the reliability, security, and efficiency of mission-critical trading systems in a dynamic, fast-paced environment. About the role * Design, develop, and maintain scalable web applications and backend services to support trading ...
About this role - You will be at the heart of BlackRock's Aladdin, building the platform that drives our and our clients investment and trading operations. Each day, you will design, develop, and maintain scalable web applications and high-performance APIs, collaborating closely with traders, product managers, and fellow engineers to define requirements and deliver impactful solutions. Your role will involve troubleshooting technical challenges, optimizing microservices and data pipelines, and continuously researching new technologies to enhance system performance. By mentoring junior engineers and contributing to our team culture, youll help ensure the reliability, security, and efficiency of mission-critical trading systems in a dynamic, fast-paced environment. About the role * Design, develop, and maintain scalable web applications and backend services to support trading ...
NEW
Backend Developer
Backend Developer
Spectrum It Recruitment Limited
Romsey (SO51)
£45000 - £50000 per annum + plus hybrid working and benefits
Romsey, Hampshire (Hybrid - 3 days office / 2 remote, flexible) * £45,000 - £50,000 + Benefits * OOP, PHP, Laravel - My client build innovative SaaS solutions that help organisations monitor, manage, and optimise critical infrastructure. Following recent growth and their migration to AWS, they're investing heavily in modernising their platform and building new products. I'm now looking for a Backend Developer to join their agile team and play a key role in shaping the future of their technology. The Role - This is a hands-on backend role with real ownership. * Stabilising and improving existing Laravel-based systems * Designing and building new SaaS products using a modern tech stack - You'll act as the backend authority within a small, collaborative team, working closely with a Frontend Developer and Senior UX/UI Designer. What You'll Be Doing - Design & Development
Romsey, Hampshire (Hybrid - 3 days office / 2 remote, flexible) * £45,000 - £50,000 + Benefits * OOP, PHP, Laravel - My client build innovative SaaS solutions that help organisations monitor, manage, and optimise critical infrastructure. Following recent growth and their migration to AWS, they're investing heavily in modernising their platform and building new products. I'm now looking for a Backend Developer to join their agile team and play a key role in shaping the future of their technology. The Role - This is a hands-on backend role with real ownership. * Stabilising and improving existing Laravel-based systems * Designing and building new SaaS products using a modern tech stack - You'll act as the backend authority within a small, collaborative team, working closely with a Frontend Developer and Senior UX/UI Designer. What You'll Be Doing - Design & Development
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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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Systems Developer / Technical Support Engineer
Systems Developer / Technical Support Engineer
DGH Recruitment
Littlehampton (BN16)
£35000 - £40000 per annum
A fantastic opportunity has arisen for a Systems Developer / Technical Support Engineer to join our Littlehampton based law firm on an initial 6 Month Fixed Team Contract. * Work directly with internal stakeholders to understand business processes, operational requirements, and system needs. * Translate business requirements into system workflows, configurations, and functional implementations. * Configure and implement software platforms, integrations, and operational tools. * Support the setup, maintenance, and optimisation of system environments. * Develop and document workflows, automation processes, and configuration standards. * Provide technical support and troubleshooting for system-related issues. * Assist with testing, implementation, and rollout of new features or system updates. * Identify opportunities to improve operational efficiency through better system ...
A fantastic opportunity has arisen for a Systems Developer / Technical Support Engineer to join our Littlehampton based law firm on an initial 6 Month Fixed Team Contract. * Work directly with internal stakeholders to understand business processes, operational requirements, and system needs. * Translate business requirements into system workflows, configurations, and functional implementations. * Configure and implement software platforms, integrations, and operational tools. * Support the setup, maintenance, and optimisation of system environments. * Develop and document workflows, automation processes, and configuration standards. * Provide technical support and troubleshooting for system-related issues. * Assist with testing, implementation, and rollout of new features or system updates. * Identify opportunities to improve operational efficiency through better system ...
NEW
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Date Posted: 31/03/2026 - Location: London - Job Type: Full time - Location: London - hybrid 50% Contract: Permanent - Hours: Full time- 35 hours - Purpose - Were looking for a Senior Full Stack Software Engineer to join a cross-functional squad focused on delivering meaningful customer value across our mobile app and website. Youll bring strong, varied engineering experience and a drive to keep learningwhether thats new languages, technologies or delivery practices. Youre comfortable shaping solutions, working closely with product managers, and making sure we build the right thing in the right way. You lead by example: hands-on with the code, supportive of your peers, and able to guide stakeholders. You care about building high-quality, pragmatic software and contribute to discussions that shape our product and technical direction.
Date Posted: 31/03/2026 - Location: London - Job Type: Full time - Location: London - hybrid 50% Contract: Permanent - Hours: Full time- 35 hours - Purpose - Were looking for a Senior Full Stack Software Engineer to join a cross-functional squad focused on delivering meaningful customer value across our mobile app and website. Youll bring strong, varied engineering experience and a drive to keep learningwhether thats new languages, technologies or delivery practices. Youre comfortable shaping solutions, working closely with product managers, and making sure we build the right thing in the right way. You lead by example: hands-on with the code, supportive of your peers, and able to guide stakeholders. You care about building high-quality, pragmatic software and contribute to discussions that shape our product and technical direction.
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We are working with an engineering led organisation delivering specialist technology solutions across infrastructure environments. They are seeking a Contract Software Engineer to take ownership of a live device configuration tool and deliver it through to completion, based at their head office in Chandlers Ford. This is a hands on delivery role focused on stabilising and enhancing an existing application, followed by contributing to a wider Azure based IoT platform. You will work closely with internal stakeholders to solve technical challenges and deliver robust, production ready solutions. Key Responsibilities * Take ownership of an in progress configuration tool and deliver to production. * Extend and improve an existing .NET WinForms application. * Integrate device APIs to automate provisioning and configuration workflows.
We are working with an engineering led organisation delivering specialist technology solutions across infrastructure environments. They are seeking a Contract Software Engineer to take ownership of a live device configuration tool and deliver it through to completion, based at their head office in Chandlers Ford. This is a hands on delivery role focused on stabilising and enhancing an existing application, followed by contributing to a wider Azure based IoT platform. You will work closely with internal stakeholders to solve technical challenges and deliver robust, production ready solutions. Key Responsibilities * Take ownership of an in progress configuration tool and deliver to production. * Extend and improve an existing .NET WinForms application. * Integrate device APIs to automate provisioning and configuration workflows.
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Full Stack Web Developer
Full Stack Web Developer
EMBL-EBI
Hinxton, Saffron Walden (CB10), CB10 1SD
From £43,015 to £79,798 per annum based on experience and family
Join the Molecular Networks team at EMBL-EBI and help build the next generation of biological knowledge resources used by researchers worldwide. Our team develops and operates internationally recognised data resources including IntAct and Complex Portal, which provide expertly curated information on molecular interactions and macromolecular complexes. These resources support systems biology, drug discovery, and biomedical research by making complex biological knowledge accessible through high-quality curation, modern data services, and programmatic APIs. We are seeking a Full Stack Web Application Developer to contribute to the development of software and infrastructure supporting these resources and their associated curation workflows. In this role, you will work at the intersection of biocuration, bioinformatics, and AI-enabled data integration, helping to build tools ...
Join the Molecular Networks team at EMBL-EBI and help build the next generation of biological knowledge resources used by researchers worldwide. Our team develops and operates internationally recognised data resources including IntAct and Complex Portal, which provide expertly curated information on molecular interactions and macromolecular complexes. These resources support systems biology, drug discovery, and biomedical research by making complex biological knowledge accessible through high-quality curation, modern data services, and programmatic APIs. We are seeking a Full Stack Web Application Developer to contribute to the development of software and infrastructure supporting these resources and their associated curation workflows. In this role, you will work at the intersection of biocuration, bioinformatics, and AI-enabled data integration, helping to build tools ...
PREMIUM
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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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Experience with Microsoft Graph API and app registrations
Experience with Microsoft Graph API and app registrations
Related Jobs
Locations
- The City, City (EC4)
- The City, City (EC2)
- The City, City (EC3)
- Southwark
- Moorgate
- St James
- Charing Cross
- Hinxton
- Pentonville
- Winnersh
- City of London
- Central London
- West End
- South East London
- Milton Keynes
- Reading
- South West London
- Bracknell
- Loughton
- Oxford
- London
- Berkshire
- Hampshire
- Surrey
- Essex
- Oxfordshire
- Buckinghamshire
- Hertfordshire
- Kent
- West Sussex
- South East