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65 Contract API jobs in Addlestone + 20 miles
684 exact matches jobs are outside your preferred location
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
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Experience creating RESTful APIs and ensuring API extensibility
Experience creating RESTful APIs and ensuring API extensibility
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Systems Engineer - Enterprise Technology
Systems Engineer - Enterprise Technology
Randstad Digital
EC1, City of London
£250000 - £350000 per annum
Proficiency with the administration, integration, and API capabilities of SaaS platforms such as Okta, Google Workspace, Atlassian products, and Slack. * Familiarity with authentication and provisioning methods like SAML, OIDC, SCIM, and non-standard API-based workflows.
Proficiency with the administration, integration, and API capabilities of SaaS platforms such as Okta, Google Workspace, Atlassian products, and Slack. * Familiarity with authentication and provisioning methods like SAML, OIDC, SCIM, and non-standard API-based workflows.
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Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
Large Language API's (from 2021) * Assisting with the maintenance and iteration of a FastAPI-based web API hosted on AWS.
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
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Senior Solution Architect
Senior Solution Architect
UK Health Security Agency
Canary Wharf, E14 4PU
From £54,416 to £68,344 per annum
The United Kingdom Health Security Agency (UKHSA) is a system leader for health security; taking action internationally to strengthen global health security, providing trusted advice to government and the public and reducing inequalities in the way different communities experience and are impacted by infectious disease, environmental hazards, and other threats to health. UKHSAs remit, as an agency with a global-to-local reach, is to protect the health of the nation from infectious diseases and other external threats to health. * Prevent: anticipate threats to health and help build the nations readiness, defences and health security * Detect: use cutting edge environmental and biological surveillance to proactively detect and monitor infectious diseases and threats to health * Analyse: use world-class science and data analytics to assess and continually monitor threats
The United Kingdom Health Security Agency (UKHSA) is a system leader for health security; taking action internationally to strengthen global health security, providing trusted advice to government and the public and reducing inequalities in the way different communities experience and are impacted by infectious disease, environmental hazards, and other threats to health. UKHSAs remit, as an agency with a global-to-local reach, is to protect the health of the nation from infectious diseases and other external threats to health. * Prevent: anticipate threats to health and help build the nations readiness, defences and health security * Detect: use cutting edge environmental and biological surveillance to proactively detect and monitor infectious diseases and threats to health * Analyse: use world-class science and data analytics to assess and continually monitor threats
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Lead .Net Software Developer
Lead .Net Software Developer
Hireful
Milton Keynes, Buckinghamshire
£65k - £75k base salary plus Bonus and awesome 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
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API analysis and design
API analysis and design
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Senior Android Engineer (UI/UX & Welcome Manager)
Senior Android Engineer (UI/UX & Welcome Manager)
Ventula Consulting Limited
The City, EC3V 9DU
Up to £140,000 per annum
API & Backend Integration: Partner with our backend (Application & AI Orchestration) engineers to define and integrate the client-side APIs and data models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries.
API & Backend Integration: Partner with our backend (Application & AI Orchestration) engineers to define and integrate the client-side APIs and data models required to power the Welcome Manager's features, from live transcription to post-call entity-extracted summaries.
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Job Description - Role / Job Title:GE Smallworld Solution Architect - Work Location:Dublin / Cork (preferred) * We are seeking an experienced GE Smallworld Solution Architect to lead the design and implementation of advanced GIS solutions. * This role requires deep technical expertise, a strong understanding of solution design, and the ability to collaborate across multiple functional teams. * You will play a key role in crafting integrated, future-ready solutions that empower our client's digital transformation journey. The Role - A critical position within the team, this role is instrumental in defining the asset strategy for a leading utilities customer. You will serve as the architectural backbone of GIS initiatives, ensuring every layer of design, integration, and deployment aligns seamlessly with business goals and technical best practices. Your Responsibilities
Job Description - Role / Job Title:GE Smallworld Solution Architect - Work Location:Dublin / Cork (preferred) * We are seeking an experienced GE Smallworld Solution Architect to lead the design and implementation of advanced GIS solutions. * This role requires deep technical expertise, a strong understanding of solution design, and the ability to collaborate across multiple functional teams. * You will play a key role in crafting integrated, future-ready solutions that empower our client's digital transformation journey. The Role - A critical position within the team, this role is instrumental in defining the asset strategy for a leading utilities customer. You will serve as the architectural backbone of GIS initiatives, ensuring every layer of design, integration, and deployment aligns seamlessly with business goals and technical best practices. Your Responsibilities
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Security Architecture Secure Design Team - Role: Manager Principal Security Architect: Secure Design (Individual Contributor) Grade: GG14 - The Security Architecture Design team is responsible for developing Security Architecture patterns, developing security controls needed for new technology, promoting the use of the architectural patterns into development projects, leading the Security Architecture Design Forum, Evaluating architectural security risks in existing systems, consulting with system development teams and architects on building security into their design. This key task of this role is accelerating the delivery of secure design artefacts and leading secure design interventions - by adding capacity and capability to the team. Reports to: Senior Manager Secure Design - Key Relationships * Business Aligned Principal Security Architects * CyberSecurity Engine
Security Architecture Secure Design Team - Role: Manager Principal Security Architect: Secure Design (Individual Contributor) Grade: GG14 - The Security Architecture Design team is responsible for developing Security Architecture patterns, developing security controls needed for new technology, promoting the use of the architectural patterns into development projects, leading the Security Architecture Design Forum, Evaluating architectural security risks in existing systems, consulting with system development teams and architects on building security into their design. This key task of this role is accelerating the delivery of secure design artefacts and leading secure design interventions - by adding capacity and capability to the team. Reports to: Senior Manager Secure Design - Key Relationships * Business Aligned Principal Security Architects * CyberSecurity Engine
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Senior Technical Business Analyst
Senior Technical Business Analyst
REC SOLUTIONS LIMITED
The City, EC4
Competitive base salary plus bonus and benefits
Technical documentation Produce and maintain detailed technical and functional documentation, including API specifications, configuration workflows, and integration guides. * Proven ability to produce and maintain high-quality technical documentation and API specifications suitable for both engineering and client consumption.
Technical documentation Produce and maintain detailed technical and functional documentation, including API specifications, configuration workflows, and integration guides. * Proven ability to produce and maintain high-quality technical documentation and API specifications suitable for both engineering and client consumption.
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Experience creating RESTful APIs and ensuring API extensibility.
Experience creating RESTful APIs and ensuring API extensibility.
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Experience in data engineering, modelling and API design, ensuring scalable and reusable data structures * Experience creating and contributing to key data architecture artefacts, including ERDs, semantic layer designs, data flow documentation, API specs and metadata management
Experience in data engineering, modelling and API design, ensuring scalable and reusable data structures * Experience creating and contributing to key data architecture artefacts, including ERDs, semantic layer designs, data flow documentation, API specs and metadata management
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Fullstack with C# Dot net HTML Web Software Developer
Fullstack with C# Dot net HTML Web Software Developer
Nexus Jobs
RM12, Hornchurch
From £50,000 to £70,000 per annum
Our Client is leader in the development of software for the financial sector. We are looking for a creative, detail-orientated Web Developer to join our Web Development team. You must have at least 5 years experience of working as a Fullstack Web Software Developer with C# Dot Net HTML and CSS. Within the Web Development team, you will have the opportunity to enjoy working with a range of web technology across the full stack. Our client base is growing and as part of this growth we are looking to improve and enhance our web-oriented product offerings. We are looking to recruit highly motivated and creative web developers who can be instrumental in delivering an ambitious digital roadmap. Ideally, we are looking for Web Developers with five plus years work experience. Additionally, candidates should be experienced in debugging and profiling applications associated with
Our Client is leader in the development of software for the financial sector. We are looking for a creative, detail-orientated Web Developer to join our Web Development team. You must have at least 5 years experience of working as a Fullstack Web Software Developer with C# Dot Net HTML and CSS. Within the Web Development team, you will have the opportunity to enjoy working with a range of web technology across the full stack. Our client base is growing and as part of this growth we are looking to improve and enhance our web-oriented product offerings. We are looking to recruit highly motivated and creative web developers who can be instrumental in delivering an ambitious digital roadmap. Ideally, we are looking for Web Developers with five plus years work experience. Additionally, candidates should be experienced in debugging and profiling applications associated with
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Proficient in hands-on development, coding, and API design.
Proficient in hands-on development, coding, and API design.
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Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
Job title: Lead Integration Developer - Location: London, UK - Job type: Contract (Inside IR35) About the Role As a Lead Integration Developer, you will be responsible for designing, developing, and maintaining integration solutions across various platforms, including Guidewire InsuranceSuite and other core systems. You will lead a team of developers, collaborate with stakeholders, and ensure the delivery of integration projects that meet business and technical requirements. What will you do? * Lead the design and implementation of integration solutions using APIs, web services, and messaging systems. * Collaborate with business analysts and architects to define integration requirements and strategies. * Develop and maintain integration components using technologies such as Java, REST/JSON, XML, and Enterprise Messaging Systems.
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Power Platform Developer
Power Platform Developer
Cathcart Technology
London
£65000.00 - £72500.00 per annum + Bonus & Pension etc
A well-respected consultancy is looking for a talented Power Platform Developer to join their growing Digital Services team in London (hybrid). This is a great opportunity to work across multiple sectors ranging from finance all the way to health analytics where you'll be helping to design and deliver innovative digital solutions that make a real difference. This company is known for empowering its people to explore new technologies and shape how the business works. You'll be joining a supportive, collaborative environment and tight-knit team where your ideas will be valued and your work will have real visibility. The Role - You'll play a key part in designing, building and maintaining business applications, workflows and automations using the Microsoft Power Platform. You'll work with Power Apps, Power Automate, Power BI and Dataverse to deliver scalable, data-driven
A well-respected consultancy is looking for a talented Power Platform Developer to join their growing Digital Services team in London (hybrid). This is a great opportunity to work across multiple sectors ranging from finance all the way to health analytics where you'll be helping to design and deliver innovative digital solutions that make a real difference. This company is known for empowering its people to explore new technologies and shape how the business works. You'll be joining a supportive, collaborative environment and tight-knit team where your ideas will be valued and your work will have real visibility. The Role - You'll play a key part in designing, building and maintaining business applications, workflows and automations using the Microsoft Power Platform. You'll work with Power Apps, Power Automate, Power BI and Dataverse to deliver scalable, data-driven
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About the Role. Application and Data integrations are the beating heart at the centre of all the client's applications - allowing the sharing of data between systems & interoperability of their platforms. This Integrations Analyst Developer will be working within their solution development team, working with the team to design, test and build new integrations and maintain existing integrations on their Boomi platform using a variety of integration techniques. This is a hybrid role, currently with 2 day per week onsite at their building in East London. About You. * You will need strong technical expertise in data integration using the Boomi platform within a large scale organisation, analytical and problem solving skills, the ability to collaborate effectively with cross-functional teams, and stakeholder management.
About the Role. Application and Data integrations are the beating heart at the centre of all the client's applications - allowing the sharing of data between systems & interoperability of their platforms. This Integrations Analyst Developer will be working within their solution development team, working with the team to design, test and build new integrations and maintain existing integrations on their Boomi platform using a variety of integration techniques. This is a hybrid role, currently with 2 day per week onsite at their building in East London. About You. * You will need strong technical expertise in data integration using the Boomi platform within a large scale organisation, analytical and problem solving skills, the ability to collaborate effectively with cross-functional teams, and stakeholder management.
Support an API-FIRST Analytics business strategy to design and build SaaS and PaaS solutions, including analytics data solutions, quantitative models, risk analytics and customized reporting tools, and other sophisticated analytical tools. * Experience leading/designing/delivering API service-based product solutions
Support an API-FIRST Analytics business strategy to design and build SaaS and PaaS solutions, including analytics data solutions, quantitative models, risk analytics and customized reporting tools, and other sophisticated analytical tools. * Experience leading/designing/delivering API service-based product solutions
Join Us as a Software Development Engineer in Test (SDET)! Overview - We are looking for a Software Development Engineer in Test (SDET) or automation tester who comes from a Java Software Development background. The role is to assist in the development of the new Index platform for the FTSE-Russell Index business of the London Stock Exchange Group (LSEG). The Index Platform team performs the calculation, maintenance and distribution of Index products. You will be working on innovative technologies with a team of engineers to implement solutions which support the strategic growth of the Index business. You will be involved in the development of complex test tools and solutions as well as new test frameworks, starting from a blank slate in some cases, to help ensure the quality of a greenfield application build.
Join Us as a Software Development Engineer in Test (SDET)! Overview - We are looking for a Software Development Engineer in Test (SDET) or automation tester who comes from a Java Software Development background. The role is to assist in the development of the new Index platform for the FTSE-Russell Index business of the London Stock Exchange Group (LSEG). The Index Platform team performs the calculation, maintenance and distribution of Index products. You will be working on innovative technologies with a team of engineers to implement solutions which support the strategic growth of the Index business. You will be involved in the development of complex test tools and solutions as well as new test frameworks, starting from a blank slate in some cases, to help ensure the quality of a greenfield application build.
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3 Days of work in the office - Job Summary * Migrate on-premise services to OCP in AWS. * Update pipelines to use in-house Trident solution. * Upgrade all components from Spring Boot 3.5 to 4. * Creation of new services or data sinks that are single responsibility and publish/consume from Kafka. * Service decommissions. * BAU work. Job Requirements * Java 17, 21 * Junit 5, Cucumber * Spring Boot 3, 4 * Tooling (Gradle, GitHub, Nexus, Artifactory, Sonar, Jacoco) * Kafka * Kubernetes, Helm * Databases (Preferably HBase, PostgreSQL) * Jenkins and CICD * Kafka Streams, Data sinks * OCP * RabbitMQ * Observability (Datadog, Grafana, Logging concepts and traces, Logback) * AWS * NoSQL datastores (Mongo, DynamoDB) * Security (Kerberos, JWT, Hashi Corp Vault, CVEs) * Design principles (Event Driven, testing, migrations, SOA, microservices, APIs)
3 Days of work in the office - Job Summary * Migrate on-premise services to OCP in AWS. * Update pipelines to use in-house Trident solution. * Upgrade all components from Spring Boot 3.5 to 4. * Creation of new services or data sinks that are single responsibility and publish/consume from Kafka. * Service decommissions. * BAU work. Job Requirements * Java 17, 21 * Junit 5, Cucumber * Spring Boot 3, 4 * Tooling (Gradle, GitHub, Nexus, Artifactory, Sonar, Jacoco) * Kafka * Kubernetes, Helm * Databases (Preferably HBase, PostgreSQL) * Jenkins and CICD * Kafka Streams, Data sinks * OCP * RabbitMQ * Observability (Datadog, Grafana, Logging concepts and traces, Logback) * AWS * NoSQL datastores (Mongo, DynamoDB) * Security (Kerberos, JWT, Hashi Corp Vault, CVEs) * Design principles (Event Driven, testing, migrations, SOA, microservices, APIs)
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MERITUS are working with a large consulting organisation looking for a Senior Java Developer on a project working into a UK Central Government client. You'll play a key role in designing, coding, reviewing, and testing solutions within the Java stack, collaborating with developers, testers, and DevOps engineers. The position also involves working on automated tests, infrastructure updates, and maintaining high-quality standards across all stages of development. The role is remote with monthly visits into the London office on an initial 6 Month contract. * Design, code, review, and unit test applications using the Java stack. * Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. * Support and enhance legacy systems currently in maintenance mode. * Contribute to automated testing (C#) and infrastructure improvements (Docker, Ans
MERITUS are working with a large consulting organisation looking for a Senior Java Developer on a project working into a UK Central Government client. You'll play a key role in designing, coding, reviewing, and testing solutions within the Java stack, collaborating with developers, testers, and DevOps engineers. The position also involves working on automated tests, infrastructure updates, and maintaining high-quality standards across all stages of development. The role is remote with monthly visits into the London office on an initial 6 Month contract. * Design, code, review, and unit test applications using the Java stack. * Collaborate with cross-functional teams, including developers, testers, and DevOps engineers. * Support and enhance legacy systems currently in maintenance mode. * Contribute to automated testing (C#) and infrastructure improvements (Docker, Ans
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Howdens are offering an exciting opportunity to take a leading role in our software development function as a Technical Architect. You will drive the technical vision, define architectural strategy, and guide the creation of innovative, scalable solutions that make a real impact on our business - What youll be doing * Technical Leadership: Mentor developers, guide best practices, and resolve complex technical challenges. * Architecture Ownership: Define, evolve, and document system architecture to align with business goals and technical standards. * Solution Design: Deliver secure, scalable solutions that balance speed, cost, and quality. * Standards & Governance: Uphold coding, testing, and security standards across teams. * Innovation: Evaluate new technologies, modernise systems, and reduce technical debt.
Howdens are offering an exciting opportunity to take a leading role in our software development function as a Technical Architect. You will drive the technical vision, define architectural strategy, and guide the creation of innovative, scalable solutions that make a real impact on our business - What youll be doing * Technical Leadership: Mentor developers, guide best practices, and resolve complex technical challenges. * Architecture Ownership: Define, evolve, and document system architecture to align with business goals and technical standards. * Solution Design: Deliver secure, scalable solutions that balance speed, cost, and quality. * Standards & Governance: Uphold coding, testing, and security standards across teams. * Innovation: Evaluate new technologies, modernise systems, and reduce technical debt.
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we are hiring forTechnical Data Architect - location: Central London - Type : Permanent - Hybrid role (2-3 days from client location) We are seeking a highly skilled TechnicalData Architect- with expertise in Databricks, PySpark, and modern data engineering practices. The ideal candidate will lead the design, development, and optimization of scalable data pipelines, while ensuring data accuracy, consistency, and performance across the enterprise Lakehouse platform. This role requires strong leadership, technical depth, and the ability to collaborate with cross-functional teams. Key Responsibilities - Lead the design, development, and maintenance of scalable, high-performance data pipelines on Databricks. Architect and implement data ingestion, transformation, and integration workflows using PySpark, SQL, and Delta Lake.
we are hiring forTechnical Data Architect - location: Central London - Type : Permanent - Hybrid role (2-3 days from client location) We are seeking a highly skilled TechnicalData Architect- with expertise in Databricks, PySpark, and modern data engineering practices. The ideal candidate will lead the design, development, and optimization of scalable data pipelines, while ensuring data accuracy, consistency, and performance across the enterprise Lakehouse platform. This role requires strong leadership, technical depth, and the ability to collaborate with cross-functional teams. Key Responsibilities - Lead the design, development, and maintenance of scalable, high-performance data pipelines on Databricks. Architect and implement data ingestion, transformation, and integration workflows using PySpark, SQL, and Delta Lake.
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