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        34 Contract API jobs in Essex + 20 miles

        94 exact matches jobs are outside your preferred location

        Endur Solution Architect

        Hays
        London
        £1000.0 - £1200.0 per day + Flexible
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
        My client is a high-profile consultancy who require an Endur Solution Architect, with experience in Endur and in Energy Trading and Risk Management (ETRM) systems, to work closely with an end customer. * Proven expertise as a Subject Matter Expert (SME) in Energy Trading and Risk Management (ETRM) systems, with deep specialization in Endur. * Ability to deliver strategic guidance and solutions for complex trading and risk management scenarios. * Strong capability to optimize Endur functionalities across front-office, middle-office, and back-office operations. * Demonstrated technical leadership in Endur-related projects, ensuring alignment with business goals and industry standards. * Solid understanding of system integration principles, including APIs, middleware, and data interfaces for seamless enterprise connectivity.
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        Senior MVC Developer

        Southern Communications Ltd
        HP2, Hemel Hempstead
        £75,000 per annum
        Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
        Take a lead role in the development and support ofMicrosoft MVC and .NET web applications and C# Console and API solutions, ensuring best practices are followed throughout the software lifecycle. * Proficient in.NET (C#), JavaScript, Web API, SQL Server, and working knowledge ofHTML, CSS, XML, JSON.
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        Senior Digital Developer (Vue/React, .Net Core, Azure)

        Stott & May Professional Search Limited
        London
        £70000 - £80000 per annum + Benefits
        Strong experience in API design and development, including RESTful APIs and OpenAPI/Swagger standards, using tools like Postman for testing and documentation.
        Strong experience in API design and development, including RESTful APIs and OpenAPI/Swagger standards, using tools like Postman for testing and documentation.
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        API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
        API Integration Experience:Proven track record of consuming and building APIs for data exchange * Strong understanding of API development and integration (REST, GraphQL)
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        Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
        Build cloud-native applications using AWS services such as Lambda, API Gateway, DynamoDB, SQS, and EventBridge * Solid experience with AWS application services (Lambda, API Gateway, Step Functions, DynamoDB, etc.) * Proven ability to design and build modern, API-driven systems in a scalable resilient cloud-based platform * Experience with modern front-end frameworks and API integration (React, Vue, Angular)
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        Rate - £500 per day Inside IR35 - Duration - 1 month initial - Location - Remote with occasional visits into London - We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
        Rate - £500 per day Inside IR35 - Duration - 1 month initial - Location - Remote with occasional visits into London - We are looking for an experienced Siebel Developer to join our client's technology team and play a pivotal role in the design, development and migration of Siebel CRM solutions. You will be responsible for enhancing existing systems, delivering robust integrations with external applications and supporting large-scale migration projects as part of digital transformation initiatives. * Design, configure and develop Siebel CRM applications to meet evolving business requirements. * Support migration projects, including data migration, environment upgrades and platform transitions. * Deliver robust integrations between Siebel and third-party systems using Siebel EAI, web services, APIs and middleware.
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        FEATURED
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months - Security Clearance: NPPV2 / NPPV3 - We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks. * Mentor and support less experienced test en
        Contract: Automated Test Engineer (SFIA 5) Rate: £400/day | Outside IR35 | Duration: 12 months - Security Clearance: NPPV2 / NPPV3 - We are seeking an experienced Automated Test Engineer to design and implement automated testing frameworks for complex systems. You will ensure both functional and non-functional requirements are met, working closely with stakeholders to deliver high-quality solutions in a fully remote, agile environment. * Develop and enhance automated testing across all stages of product, system, and service development. * Collaborate with stakeholders to define requirements, acceptance criteria, and ensure robust test coverage. * Implement automation-first strategies and best practices for repeatable, efficient testing. * Identify and adopt tools, techniques, and processes to strengthen testing frameworks. * Mentor and support less experienced test en
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        PowerBI Specialist (Contract) | £350-£450 p/day (Outside IR35) | 3 Months (strong possibility of extension) | ASAP - We're hiring on behalf of a fast-growing SaaS company that's looking for an experienced Power BI Specialist to take ownership of their reporting environment. This is a fully remote contract role, starting immediately. The client has a strong BI foundation in place, but they're now looking for someone who can streamline reporting, reduce maintenance, and optimise their use of Power BI at scale. Right now, customer-specific reports are managed individually (e.g. 45+ reports needing updates when a change is made). They want to consolidate, automate, and improve efficiency across their reporting suite. This is not a 'start from scratch' build - instead, you'll be reviewing what's already in place, identifying improvements, and implementing changes to drive
        PowerBI Specialist (Contract) | £350-£450 p/day (Outside IR35) | 3 Months (strong possibility of extension) | ASAP - We're hiring on behalf of a fast-growing SaaS company that's looking for an experienced Power BI Specialist to take ownership of their reporting environment. This is a fully remote contract role, starting immediately. The client has a strong BI foundation in place, but they're now looking for someone who can streamline reporting, reduce maintenance, and optimise their use of Power BI at scale. Right now, customer-specific reports are managed individually (e.g. 45+ reports needing updates when a change is made). They want to consolidate, automate, and improve efficiency across their reporting suite. This is not a 'start from scratch' build - instead, you'll be reviewing what's already in place, identifying improvements, and implementing changes to drive
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        NEWFEATURED
        We're looking for an experienced Engineering Manager to oversee the technical migration of a Product Information Management (PIM) system - namely STIBO STEP - from an on-premise setup to a SaaS solution. This role requires close collaboration with internal product and engineering teams, as well as with external partners. * 10+ years in software engineering and delivery, with at least 5 years in leadership, principal, or managerial roles. * Strong expertise in PIM/MDM platforms, with hands-on experience in STIBO STEP essential. * Proven track record migrating enterprise applications to SaaS, ideally within large-scale, complex environments. * Languages: Java 17+ (Java 21 preferred) * Frameworks: Micronaut (preferred), Spring Boot * Testing: JUnit, Mockito * Build Tools: Gradle * Data & Messaging: Kafka, MongoDB * APIs: GraphQL Federation, REST
        We're looking for an experienced Engineering Manager to oversee the technical migration of a Product Information Management (PIM) system - namely STIBO STEP - from an on-premise setup to a SaaS solution. This role requires close collaboration with internal product and engineering teams, as well as with external partners. * 10+ years in software engineering and delivery, with at least 5 years in leadership, principal, or managerial roles. * Strong expertise in PIM/MDM platforms, with hands-on experience in STIBO STEP essential. * Proven track record migrating enterprise applications to SaaS, ideally within large-scale, complex environments. * Languages: Java 17+ (Java 21 preferred) * Frameworks: Micronaut (preferred), Spring Boot * Testing: JUnit, Mockito * Build Tools: Gradle * Data & Messaging: Kafka, MongoDB * APIs: GraphQL Federation, REST
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        Dynamics 365 CRM Product Manager

        Southern Communications Ltd
        HP2, Hemel Hempstead
        £70,000 per annum
        Office Location: Hemel Hempstead - Hybrid Working - Salary: £70,000 - We are seeking a capable and business-savvyDynamics 365 CRM Product Managerto lead the strategy, design, and evolution of our CRM platform. This is a hybrid role that blends traditional product ownership responsibilities with deep platform expertiseincluding hands-on configuration, role management, and solution optimisation across the Dynamics 365 environment. You will act as the central point of contact for CRM functionality, ensuring alignment with business processes and championing continuous improvement through well-informed design and feature decisions. Product Ownership * Serve as the primary owner of the Dynamics 365 CRM product roadmap, prioritising features and enhancements in line with business goals. * Work closely with stakeholders across departments to understand process needs, pain poi
        Office Location: Hemel Hempstead - Hybrid Working - Salary: £70,000 - We are seeking a capable and business-savvyDynamics 365 CRM Product Managerto lead the strategy, design, and evolution of our CRM platform. This is a hybrid role that blends traditional product ownership responsibilities with deep platform expertiseincluding hands-on configuration, role management, and solution optimisation across the Dynamics 365 environment. You will act as the central point of contact for CRM functionality, ensuring alignment with business processes and championing continuous improvement through well-informed design and feature decisions. Product Ownership * Serve as the primary owner of the Dynamics 365 CRM product roadmap, prioritising features and enhancements in line with business goals. * Work closely with stakeholders across departments to understand process needs, pain poi
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        Android Mobile Engineer - Remote

        Halian Technology Limited
        London
        From £82,000 to £92,000 per annum
        Halian Technology are searching for an Android Mobile Engineer to join our clients forward-thinking mobile team. Our client is one of the UKs most trusted and innovative omni-channel retailers, where technology and customer experience go hand in hand. If youre passionate about delivering high-quality mobile experiences and want to work with modern tools, great people, and at a company where learning and development are core valuesthis is the role for you. * Lead Android engineering efforts on customer-facing apps used by millions across the UK. * Influence architecture and development strategy within a high-performing Agile squad. * Provide technical assurance and guidance across complex, high-impact projects. * Collaborate cross-functionally with iOS Engineers, BAs, QAs, Designers, and UX Specialists.
        Halian Technology are searching for an Android Mobile Engineer to join our clients forward-thinking mobile team. Our client is one of the UKs most trusted and innovative omni-channel retailers, where technology and customer experience go hand in hand. If youre passionate about delivering high-quality mobile experiences and want to work with modern tools, great people, and at a company where learning and development are core valuesthis is the role for you. * Lead Android engineering efforts on customer-facing apps used by millions across the UK. * Influence architecture and development strategy within a high-performing Agile squad. * Provide technical assurance and guidance across complex, high-impact projects. * Collaborate cross-functionally with iOS Engineers, BAs, QAs, Designers, and UX Specialists.
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        ServiceNow Developer

        Sopra Steria Limited
        HP2, Hemel Hempstead
        Up to £90,000 per annum
        We're on the lookout for a passionate Lead ServiceNow Developer to stimulate innovation, lead a hard-working team, and craft the future of digital transformation! Sopra Steria's Strategic Digital Services are once again growing their ServiceNow capability and are in the market for Lead ServiceNow Developers! We are seeking an experiencedLead ServiceNow Developerto drive the design, development, and implementation of ServiceNow solutions. In this role, you will direct a team of developers, collaborate with key stakeholders, and drive the successful delivery of scalable and efficient ServiceNow applications. You will be responsible for technical strategy, best practices, and innovative solutions to enhance business processes. We can offer great career progression opportunities, benefits which you can flex to meet your needs and training and development opportunities.
        We're on the lookout for a passionate Lead ServiceNow Developer to stimulate innovation, lead a hard-working team, and craft the future of digital transformation! Sopra Steria's Strategic Digital Services are once again growing their ServiceNow capability and are in the market for Lead ServiceNow Developers! We are seeking an experiencedLead ServiceNow Developerto drive the design, development, and implementation of ServiceNow solutions. In this role, you will direct a team of developers, collaborate with key stakeholders, and drive the successful delivery of scalable and efficient ServiceNow applications. You will be responsible for technical strategy, best practices, and innovative solutions to enhance business processes. We can offer great career progression opportunities, benefits which you can flex to meet your needs and training and development opportunities.
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        NEWFEATURED
        Location: Melton (Hybrid Role) Salary: £65,000 - The purpose of this role is to solve complex business problems and technical challenges through the design and development of software applications and services. This role will contribute directly towards exciting technology opportunities in the public health sector; specifically in general practice. You will be responsible for building and maintaining critical components of our software infrastructure, ensuring high performance, reliability, and security. This role sits within the platform team. Key Responsibilities - Design and Development * Design, develop and implement high-performance, scalable and maintainable backend systems * Develop APIs and other web services * Work with databases (relational and NoSQL) to design and implement dara models * Participate in all phases of the software development lifecycle, from
        Location: Melton (Hybrid Role) Salary: £65,000 - The purpose of this role is to solve complex business problems and technical challenges through the design and development of software applications and services. This role will contribute directly towards exciting technology opportunities in the public health sector; specifically in general practice. You will be responsible for building and maintaining critical components of our software infrastructure, ensuring high performance, reliability, and security. This role sits within the platform team. Key Responsibilities - Design and Development * Design, develop and implement high-performance, scalable and maintainable backend systems * Develop APIs and other web services * Work with databases (relational and NoSQL) to design and implement dara models * Participate in all phases of the software development lifecycle, from
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        Dynatrace Engineer - SC Cleared

        Stott & May Professional Search Limited
        London
        £350 - £425 per day
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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        6 Month contract initially - Based: Hybrid/London (Max - 3 days p/w onsite) Rate: £600 - £650 p/d (via Umbrella company) We have a great opportunity with a world leading organisation where you will be provided with all of the support and development to succeed. A progressive organisation where you can really make a difference. We have a great opportunity for a Lead SAP Analytics Cloud (SAC) Consultant to join the team. We are seeking an experienced and strategic SAP Professional to lead the design, implementation, and optimization of solutions using SAP Analytics Cloud (SAC). This role will be responsible for managing and implementing cloud data integration, analytics strategy, and ensuring business insights are delivered effectively across the organization. It is also expected the candidate should have fair knowledge of SAP S4/HANNA Professional Services processes.
        6 Month contract initially - Based: Hybrid/London (Max - 3 days p/w onsite) Rate: £600 - £650 p/d (via Umbrella company) We have a great opportunity with a world leading organisation where you will be provided with all of the support and development to succeed. A progressive organisation where you can really make a difference. We have a great opportunity for a Lead SAP Analytics Cloud (SAC) Consultant to join the team. We are seeking an experienced and strategic SAP Professional to lead the design, implementation, and optimization of solutions using SAP Analytics Cloud (SAC). This role will be responsible for managing and implementing cloud data integration, analytics strategy, and ensuring business insights are delivered effectively across the organization. It is also expected the candidate should have fair knowledge of SAP S4/HANNA Professional Services processes.
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        Our Client are looking for an SC cleared Frontend Engineer who thrives in environments where information is dense, the interface is critical, and the work matters. You excel at building responsive, intuitive UIs that surface complex machine learning insights to end users with clarity and usability. You care about the user journey as much as the underlying data, and you are motivated by delivering real-world impact in demanding operational settings. * Design and implement frontend interfaces that support live and retrospective exploration of data from complex systems * Build and iterate on React-based UIs for transcription review, dynamic querying, and data visualisation * Integrate user-facing features with backend APIs and machine learning services, including LLM outputs, NLP pipelines and structured data stores
        Our Client are looking for an SC cleared Frontend Engineer who thrives in environments where information is dense, the interface is critical, and the work matters. You excel at building responsive, intuitive UIs that surface complex machine learning insights to end users with clarity and usability. You care about the user journey as much as the underlying data, and you are motivated by delivering real-world impact in demanding operational settings. * Design and implement frontend interfaces that support live and retrospective exploration of data from complex systems * Build and iterate on React-based UIs for transcription review, dynamic querying, and data visualisation * Integrate user-facing features with backend APIs and machine learning services, including LLM outputs, NLP pipelines and structured data stores
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        Job Title: Firewall Engineer - Location: London or Gloucester (Hybrid) Contract Type: 6 months, Inside IR35 - Day Rate:£360 - The Role - Were looking for a skilled Firewall Engineer with active UK SC Clearance to join on a 6-month contract. Youll be responsible for firewall rule optimisation, configuration, and transformation activities across complex IT and OT environments. This role requires strong experience across multiple vendors (Palo Alto, Fortinet, Cisco ASA, Check Point) and the ability to collaborate with technical and non-technical stakeholders to maintain compliance and security best practice. Key Responsibilities * Configure, implement, and manage firewall solutions across multi-vendor environments * Review, optimise, and enforce firewall rules and policies * Support migrations and replacement projects for firewall infrastructure
        Job Title: Firewall Engineer - Location: London or Gloucester (Hybrid) Contract Type: 6 months, Inside IR35 - Day Rate:£360 - The Role - Were looking for a skilled Firewall Engineer with active UK SC Clearance to join on a 6-month contract. Youll be responsible for firewall rule optimisation, configuration, and transformation activities across complex IT and OT environments. This role requires strong experience across multiple vendors (Palo Alto, Fortinet, Cisco ASA, Check Point) and the ability to collaborate with technical and non-technical stakeholders to maintain compliance and security best practice. Key Responsibilities * Configure, implement, and manage firewall solutions across multi-vendor environments * Review, optimise, and enforce firewall rules and policies * Support migrations and replacement projects for firewall infrastructure
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        Python Developer

        McGregor Boyall Associates Limited
        London
        £600 - £700 per day
        Join a global financial services leader at the forefront of electronic trading infrastructure. They are looking for a skilled Python Software Engineer to contribute to cutting-edge automation tools powering low-latency trading systems. This is a Senior engineering role within a high-impact team shaping infrastructure for global markets. What You'll Do * Design, build, and maintain automation tools supporting electronic trading infrastructure * Take ownership of components from design to deployment * Collaborate across teams in a fast-paced, regulated environment?? Tech You'll Work With * Core Python with OOP, data structures, and regex * Linux CLI, debugging with tcpdump, strace, etc. * Git, Jenkins, TDD, and CI pipelines * RESTful APIs, Ansible (bonus), and even Golang (bonus)? What We're Looking For * Strong Python development skills and testing experience
        Join a global financial services leader at the forefront of electronic trading infrastructure. They are looking for a skilled Python Software Engineer to contribute to cutting-edge automation tools powering low-latency trading systems. This is a Senior engineering role within a high-impact team shaping infrastructure for global markets. What You'll Do * Design, build, and maintain automation tools supporting electronic trading infrastructure * Take ownership of components from design to deployment * Collaborate across teams in a fast-paced, regulated environment?? Tech You'll Work With * Core Python with OOP, data structures, and regex * Linux CLI, debugging with tcpdump, strace, etc. * Git, Jenkins, TDD, and CI pipelines * RESTful APIs, Ansible (bonus), and even Golang (bonus)? What We're Looking For * Strong Python development skills and testing experience
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        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
        Location: London OR Gloucester OR Warrington (Hybrid) Contract Duration: 6 months (starting ASAP) Security Clearance: UK SC Cleared (Mandatory) We are looking for an experienced Dynatrace Engineer to join an established IT Infrastructure team on a 6-month contract. This is a high-impact role focused on building scalable observability solutions using Dynatrace across multi-cloud environments (AWS & Azure), with a strong emphasis on automation and Infrastructure-as-Code using Terraform. You'll work cross-functionally with engineering, platform, and operations teams to enhance monitoring, improve performance visibility, and drive proactive incident management. This role can be based out of London, Gloucester, or Warrington, with some flexibility on hybrid working arrangements. Occasional on-call and out-of-hours work may be required, depending on project needs.
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        Work closely with the team to develop new features, such as better interpretation layers, enhanced data decoding, and improved API coverage for various blockchain data.
        Work closely with the team to develop new features, such as better interpretation layers, enhanced data decoding, and improved API coverage for various blockchain data.
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        What is the average salary for API in Essex?

        Average salary per year
        £47,499

        The average salary for a API in Essex is £47,499. API in Essex salaries range from £37,499 to £47,499.

        Frequently Asked Questions

        How many contract API jobs are there in Essex?
        There are 34 contract API jobs within 20 miles of Essex available on CWJobs right now.

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