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2 Contract API jobs in Chesterfield + 20 miles
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Card Solutions Architects - Contract role - Sheffield - Immediate
Card Solutions Architects - Contract role - Sheffield - Immediate
StrategicsIQ Ltd
Sheffield (S1)
Unspecified
Promote adoption of modern engineering practices including microservices, API-first design, and domain-driven design * Channels: Experience designing across web, mobile, API gateways, and backend orchestration layers
Promote adoption of modern engineering practices including microservices, API-first design, and domain-driven design * Channels: Experience designing across web, mobile, API gateways, and backend orchestration layers
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Derbyshire | Hybrid - c£75,000 - Fixed Term Contract | for 6 months - 3 days a week - Part time - This is a hands-on consultancy role sitting at the intersection of IT and business operations, working closely with Finance, Sales, Operations and Account Management to make sure these systems are configured, stable, and embedded for the long term. * Administer and optimise NetSuite across modules including SA, GL, AR, AP, FAM, CRM, WMS, Projects and more * Conduct structured process reviews with business teams and translate requirements into system design and configuration * Build and maintain dashboards, saved searches, and reports that drive genuine business insight * Support ETL activities and oversee integrations with internal and third-party platforms * Deliver targeted training and documentation to upskill internal teams for long-term ownership
Derbyshire | Hybrid - c£75,000 - Fixed Term Contract | for 6 months - 3 days a week - Part time - This is a hands-on consultancy role sitting at the intersection of IT and business operations, working closely with Finance, Sales, Operations and Account Management to make sure these systems are configured, stable, and embedded for the long term. * Administer and optimise NetSuite across modules including SA, GL, AR, AP, FAM, CRM, WMS, Projects and more * Conduct structured process reviews with business teams and translate requirements into system design and configuration * Build and maintain dashboards, saved searches, and reports that drive genuine business insight * Support ETL activities and oversee integrations with internal and third-party platforms * Deliver targeted training and documentation to upskill internal teams for long-term ownership
FEATURED
23 exact matches jobs are outside your preferred location
Role Title: API Security Architect "We are looking for an API Security Architect to define, design, and oversee the implementation of enterprise-grade API security architecture. * Design end-to-end API security architecture across cloud and on-premise environments. * Define API security standards covering authentication, authorization, encryption, and threat protection. * Lead architectural reviews, threat modelling, and risk assessments for API integrations. * Select, architect, and optimize API gateways, WAFs, and security controls. * Provide security governance for API development, lifecycle management, and CI/CD practices. * Oversee remediation strategies for API vulnerabilities and guide architecture improvements. * Proven experience in API security architecture within large-scale environments. * Expertise in API gateways (Apigee, Azure API Management, Kong, Mulesoft).
Role Title: API Security Architect "We are looking for an API Security Architect to define, design, and oversee the implementation of enterprise-grade API security architecture. * Design end-to-end API security architecture across cloud and on-premise environments. * Define API security standards covering authentication, authorization, encryption, and threat protection. * Lead architectural reviews, threat modelling, and risk assessments for API integrations. * Select, architect, and optimize API gateways, WAFs, and security controls. * Provide security governance for API development, lifecycle management, and CI/CD practices. * Oversee remediation strategies for API vulnerabilities and guide architecture improvements. * Proven experience in API security architecture within large-scale environments. * Expertise in API gateways (Apigee, Azure API Management, Kong, Mulesoft).
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Java Software Developer (Inside IR35) - Contract
Java Software Developer (Inside IR35) - Contract
Stealth IT Consulting Limited
Manchester (M1)
Up to £476 per day Up to £476 per day
Contribute to API development, integration, and backend service build.
Contribute to API development, integration, and backend service build.
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Senior SAP Functional Consultant
Senior SAP Functional Consultant
Stackstudio Digital Ltd.
Leicester, Leicestershire
From £400 to £450 per day
The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
The role requires strong cross module and integration experience, including IDoc, SAP Proxy, and API based integrations, in complex SAP landscapes. Manage and support integrations using IDoc, SAP Proxy, and API (REST/SOAP)
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A consultancy we are working with are looking for a Senior .NET Developer to support and enhance a suite of business critical applications. This is a backend-focused role, and the successful candidate must be able to take ownership quickly and deliver impact from day one. Key Responsibilities * Develop and maintain complex backend systems using C# / .NET Core * Design and support RESTful APIs and microservices * Build and maintain CI/CD pipelines (Azure DevOps, YAML, Terraform) * Deliver integration and data migration solutions - Essential Skills * 10+ years' C# / .NET Core (backend-heavy systems) * Strong Azure experience (Functions, Web Apps, DevOps, CI/CD) * REST APIs and microservices architecture * Experience with complex, data-driven or integration-heavy environments - Desirable * RabbitMQ or Azure Service Bus * React or Angular * ETL / data integration
A consultancy we are working with are looking for a Senior .NET Developer to support and enhance a suite of business critical applications. This is a backend-focused role, and the successful candidate must be able to take ownership quickly and deliver impact from day one. Key Responsibilities * Develop and maintain complex backend systems using C# / .NET Core * Design and support RESTful APIs and microservices * Build and maintain CI/CD pipelines (Azure DevOps, YAML, Terraform) * Deliver integration and data migration solutions - Essential Skills * 10+ years' C# / .NET Core (backend-heavy systems) * Strong Azure experience (Functions, Web Apps, DevOps, CI/CD) * REST APIs and microservices architecture * Experience with complex, data-driven or integration-heavy environments - Desirable * RabbitMQ or Azure Service Bus * React or Angular * ETL / data integration
Implementation Specialist – E-Invoicing
Implementation Specialist – E-Invoicing
Stackstudio Digital Ltd.
Manchester (M1)
From £300 to £350 per day
Job Title: Implementation Specialist E-Invoicing - Location: London- 1 day - Job Type: 6 months- Inside IR35 - Role overview - Are you looking for a role that will use your problem-solving skills, technical interests, and client communication skills to their full potential? We are seeking Implementation Specialists to join our e-invoicing Professional Services team and lead the technical implementation of our e-invoicing platform with global clients. This is the perfect role for a well-organised, collaborative, and analytical person who wants to grow their career within the software implementation space and work with a varied portfolio of multinational clients. You'll use your technical aptitude, excellent communication skills, and problem-solving abilities to tackle client configuration challenges and ensure the highest level of service.
Job Title: Implementation Specialist E-Invoicing - Location: London- 1 day - Job Type: 6 months- Inside IR35 - Role overview - Are you looking for a role that will use your problem-solving skills, technical interests, and client communication skills to their full potential? We are seeking Implementation Specialists to join our e-invoicing Professional Services team and lead the technical implementation of our e-invoicing platform with global clients. This is the perfect role for a well-organised, collaborative, and analytical person who wants to grow their career within the software implementation space and work with a varied portfolio of multinational clients. You'll use your technical aptitude, excellent communication skills, and problem-solving abilities to tackle client configuration challenges and ensure the highest level of service.
Implementation Specialist – E-Invoicing
Implementation Specialist – E-Invoicing
Stackstudio Digital Ltd.
Leicester (LE1)
From £300 to £350 per day
Job Title: Implementation Specialist E-Invoicing - Location: London- 1 day - Job Type: 6 months- Inside IR35 - Role overview - Are you looking for a role that will use your problem-solving skills, technical interests, and client communication skills to their full potential? We are seeking Implementation Specialists to join our e-invoicing Professional Services team and lead the technical implementation of our e-invoicing platform with global clients. This is the perfect role for a well-organised, collaborative, and analytical person who wants to grow their career within the software implementation space and work with a varied portfolio of multinational clients. You'll use your technical aptitude, excellent communication skills, and problem-solving abilities to tackle client configuration challenges and ensure the highest level of service.
Job Title: Implementation Specialist E-Invoicing - Location: London- 1 day - Job Type: 6 months- Inside IR35 - Role overview - Are you looking for a role that will use your problem-solving skills, technical interests, and client communication skills to their full potential? We are seeking Implementation Specialists to join our e-invoicing Professional Services team and lead the technical implementation of our e-invoicing platform with global clients. This is the perfect role for a well-organised, collaborative, and analytical person who wants to grow their career within the software implementation space and work with a varied portfolio of multinational clients. You'll use your technical aptitude, excellent communication skills, and problem-solving abilities to tackle client configuration challenges and ensure the highest level of service.
Role/Job title: Starburst Developer - Work Location: London (2 days in a week MUFG Client Office) The Role - Design and maintain data pipelines using Starburst and related technologies. Optimize query performance and resolve data processing bottlenecks. Manage databases to ensure high availability, reliability and security. Integrate Starburst with various data sources including cloud services and APIs. Monitor data pipelines and troubleshoot issues proactively. Collaborate with business users and stakeholders on data requirements. Maintain comprehensive and up-to-date documentation for data processes. Stay current with data engineering advancements and propose innovative solutions. Implement best practices for data quality assurance and testing. Your Profile - Essential skills/knowledge/experience: (Up to 10, Avoid repetition)
Role/Job title: Starburst Developer - Work Location: London (2 days in a week MUFG Client Office) The Role - Design and maintain data pipelines using Starburst and related technologies. Optimize query performance and resolve data processing bottlenecks. Manage databases to ensure high availability, reliability and security. Integrate Starburst with various data sources including cloud services and APIs. Monitor data pipelines and troubleshoot issues proactively. Collaborate with business users and stakeholders on data requirements. Maintain comprehensive and up-to-date documentation for data processes. Stay current with data engineering advancements and propose innovative solutions. Implement best practices for data quality assurance and testing. Your Profile - Essential skills/knowledge/experience: (Up to 10, Avoid repetition)
Role/Job title: Starburst Developer - Work Location: London (2 days in a week MUFG Client Office) The Role - Design and maintain data pipelines using Starburst and related technologies. Optimize query performance and resolve data processing bottlenecks. Manage databases to ensure high availability, reliability and security. Integrate Starburst with various data sources including cloud services and APIs. Monitor data pipelines and troubleshoot issues proactively. Collaborate with business users and stakeholders on data requirements. Maintain comprehensive and up-to-date documentation for data processes. Stay current with data engineering advancements and propose innovative solutions. Implement best practices for data quality assurance and testing. Your Profile - Essential skills/knowledge/experience: (Up to 10, Avoid repetition)
Role/Job title: Starburst Developer - Work Location: London (2 days in a week MUFG Client Office) The Role - Design and maintain data pipelines using Starburst and related technologies. Optimize query performance and resolve data processing bottlenecks. Manage databases to ensure high availability, reliability and security. Integrate Starburst with various data sources including cloud services and APIs. Monitor data pipelines and troubleshoot issues proactively. Collaborate with business users and stakeholders on data requirements. Maintain comprehensive and up-to-date documentation for data processes. Stay current with data engineering advancements and propose innovative solutions. Implement best practices for data quality assurance and testing. Your Profile - Essential skills/knowledge/experience: (Up to 10, Avoid repetition)
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Location: Leeds (Hybrid 3 days onsite) Contract: 3 Months (Immediate Start) Rate: Competitive (Market Rates) The Opportunity - We are working with a leading global technology consultancy to recruit an AI Product Developer for a high-impact engagement within the financial services sector. This is an excellent opportunity to work on cutting-edge AI solutions, designing and delivering Copilot and LLM-powered products within a rapidly evolving AI Foundry environment. You will play a key role in shaping scalable, secure, and enterprise-grade AI capabilities. What Youll Be Doing - Designing and building Copilot solutions, intelligent agents, and LLM workflows - Developing scalable AI components including RAG pipelines, embeddings, and vector search - Integrating AI solutions into enterprise systems, APIs, and cloud platforms
Location: Leeds (Hybrid 3 days onsite) Contract: 3 Months (Immediate Start) Rate: Competitive (Market Rates) The Opportunity - We are working with a leading global technology consultancy to recruit an AI Product Developer for a high-impact engagement within the financial services sector. This is an excellent opportunity to work on cutting-edge AI solutions, designing and delivering Copilot and LLM-powered products within a rapidly evolving AI Foundry environment. You will play a key role in shaping scalable, secure, and enterprise-grade AI capabilities. What Youll Be Doing - Designing and building Copilot solutions, intelligent agents, and LLM workflows - Developing scalable AI components including RAG pipelines, embeddings, and vector search - Integrating AI solutions into enterprise systems, APIs, and cloud platforms
FEATURED
Software Engineer (.net / Angular)
Software Engineer (.net / Angular)
Vix Technology Ltd
Manchester, Greater Manchester
£35,000 - £50,000 a year
Experienced in use of AWS services such as API Gateway, SNS, SQS, ECS, S3.
Experienced in use of AWS services such as API Gateway, SNS, SQS, ECS, S3.
Youll join our product and engineering team, working on a modern front-end application built with Nuxt that sits on top of our Django-powered API.
Youll join our product and engineering team, working on a modern front-end application built with Nuxt that sits on top of our Django-powered API.
Senior / Mid Level Software Developers
Senior / Mid Level Software Developers
James and James Fulfilment
Manchester, Greater Manchester
£50,000 - £70,000 a year
Fresh off our merger into the QLS Group, J&J Global is now the largest independent ecommerce fulfilment provider in Europe. But were just getting started. Were looking for Senior and Mid-Level Developers to join a newly formed team focused on evolving our proprietary fulfilment platform. If youre looking to own your work and solve complex problems in real-time logistics - from intelligent inventory to seamless global returns - we want to hear from you. What youll be doing * You will develop, maintain and enhance the core components of our fulfilment software. * Developing and scaling the backend services and APIs that drive our order processing, inventory, and warehouse workflows * Building sleek, responsive UIs that help our internal operations teams and external partners move faster and smarter
Fresh off our merger into the QLS Group, J&J Global is now the largest independent ecommerce fulfilment provider in Europe. But were just getting started. Were looking for Senior and Mid-Level Developers to join a newly formed team focused on evolving our proprietary fulfilment platform. If youre looking to own your work and solve complex problems in real-time logistics - from intelligent inventory to seamless global returns - we want to hear from you. What youll be doing * You will develop, maintain and enhance the core components of our fulfilment software. * Developing and scaling the backend services and APIs that drive our order processing, inventory, and warehouse workflows * Building sleek, responsive UIs that help our internal operations teams and external partners move faster and smarter
Senior / Mid Level Software Developers
Senior / Mid Level Software Developers
James and James Fulfilment
Leeds, West Yorkshire
£50,000 - £70,000 a year
Fresh off our merger into the QLS Group, J&J Global is now the largest independent ecommerce fulfilment provider in Europe. But were just getting started. Were looking for Senior and Mid-Level Developers to join a newly formed team focused on evolving our proprietary fulfilment platform. If youre looking to own your work and solve complex problems in real-time logistics - from intelligent inventory to seamless global returns - we want to hear from you. What youll be doing * You will develop, maintain and enhance the core components of our fulfilment software. * Developing and scaling the backend services and APIs that drive our order processing, inventory, and warehouse workflows * Building sleek, responsive UIs that help our internal operations teams and external partners move faster and smarter
Fresh off our merger into the QLS Group, J&J Global is now the largest independent ecommerce fulfilment provider in Europe. But were just getting started. Were looking for Senior and Mid-Level Developers to join a newly formed team focused on evolving our proprietary fulfilment platform. If youre looking to own your work and solve complex problems in real-time logistics - from intelligent inventory to seamless global returns - we want to hear from you. What youll be doing * You will develop, maintain and enhance the core components of our fulfilment software. * Developing and scaling the backend services and APIs that drive our order processing, inventory, and warehouse workflows * Building sleek, responsive UIs that help our internal operations teams and external partners move faster and smarter
Company Description - Angstrom is a proprietary sports pricing and product provider, building intricate, simulation driven pricing and risk systems to support the success of key sports brands across the Entain group. Founded in 2018 and having established itself as a pioneer in player-level, play-by-play simulations and forecasting, Angstrom was acquired by Entain in 2023. Today, we operate as a semi-autonomous division, responsible for delivering the groups most advanced pricing and risk capabilities with a focus on the US market. Were committed to building the next generation of sports betting products sports-first, recreationally-focused, and designed to make betting more engaging, more intelligent, and more fun. Were proud to be a high-performing, low-ego team where brilliant people work and people work to become brilliant.
Company Description - Angstrom is a proprietary sports pricing and product provider, building intricate, simulation driven pricing and risk systems to support the success of key sports brands across the Entain group. Founded in 2018 and having established itself as a pioneer in player-level, play-by-play simulations and forecasting, Angstrom was acquired by Entain in 2023. Today, we operate as a semi-autonomous division, responsible for delivering the groups most advanced pricing and risk capabilities with a focus on the US market. Were committed to building the next generation of sports betting products sports-first, recreationally-focused, and designed to make betting more engaging, more intelligent, and more fun. Were proud to be a high-performing, low-ego team where brilliant people work and people work to become brilliant.
Youll join our product and engineering team working on a Django back end and REST API that powers the Shortlister platform. Own and enhance our Django REST API, improving performance, security, maintainability and developer experience * Solid understanding of API design and HTTP fundamentals (authentication, headers, CORS, versioning)
Youll join our product and engineering team working on a Django back end and REST API that powers the Shortlister platform. Own and enhance our Django REST API, improving performance, security, maintainability and developer experience * Solid understanding of API design and HTTP fundamentals (authentication, headers, CORS, versioning)
Integration with SFTP, API-based connections, and secure channels
Integration with SFTP, API-based connections, and secure channels
Hands-on Experience working with Business Rules, Client Scripts, UI Policies, UI Scripts, UI Actions, UI Pages, Script Includes, Access Control Lists, API's, Service Portal etc...
Hands-on Experience working with Business Rules, Client Scripts, UI Policies, UI Scripts, UI Actions, UI Pages, Script Includes, Access Control Lists, API's, Service Portal etc...
Contract Opportunity – Technical Architect - 12 Month Contract
Contract Opportunity – Technical Architect - 12 Month Contract
Stealth IT Consulting Limited
UK
Up to £500 per day Up to £500 (Outside) per day
API Migration | Enterprise Platform Transition - Im supporting a major public-sector digital transformation programme and looking for an experienced Technical Architectto lead a large-scale API migration project. * Lead the architecture for a significant API migration programme - If youre an experienced Technical Architect with proven API migration experience and available for a long-term Outside IR35 engagement, Id be keen to speak with you.
API Migration | Enterprise Platform Transition - Im supporting a major public-sector digital transformation programme and looking for an experienced Technical Architectto lead a large-scale API migration project. * Lead the architecture for a significant API migration programme - If youre an experienced Technical Architect with proven API migration experience and available for a long-term Outside IR35 engagement, Id be keen to speak with you.
FEATURED
Experience with Gurobi Python API (gurobipy)
Experience with Gurobi Python API (gurobipy)
Mobile Architect (iOS & Android) - £500 Outside
Mobile Architect (iOS & Android) - £500 Outside
Stealth IT Consulting Limited
UK
Up to £500 per day Up to £500 Outside per day
Contract: 12 Months - Day Rate:£500 per day (Outside IR35) Clearance: SC Eligible - Sector:UK Public Sector - Location: Fully Remote (UK-based) Start Date: ASAP - Overview - We are seeking an experienced Mobile Architect to support a large-scale public sector digital transformation programme. The successful candidate will lead mobile solution architecture across iOS and Android, ensuring scalable, secure, and high-performing mobile services. This is a key role within a modern engineering environment, working closely with product teams, developers, and senior stakeholders. Key Responsibilities * Lead the end-to-end mobile architecture across iOS and Android platforms. * Define architectural standards, best practices, and technical direction. * Work closely with development teams to ensure architectural alignment and technical quality.
Contract: 12 Months - Day Rate:£500 per day (Outside IR35) Clearance: SC Eligible - Sector:UK Public Sector - Location: Fully Remote (UK-based) Start Date: ASAP - Overview - We are seeking an experienced Mobile Architect to support a large-scale public sector digital transformation programme. The successful candidate will lead mobile solution architecture across iOS and Android, ensuring scalable, secure, and high-performing mobile services. This is a key role within a modern engineering environment, working closely with product teams, developers, and senior stakeholders. Key Responsibilities * Lead the end-to-end mobile architecture across iOS and Android platforms. * Define architectural standards, best practices, and technical direction. * Work closely with development teams to ensure architectural alignment and technical quality.
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Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
Full Stack Engineer - Outisde IR35 up to £525 - Intial 4 month contract, high chance of extension - I am recruiting for multiple Full Stack Engineers to help our client build scalable, high-performance applications and contribute across both backend and frontend systems. This role involves working on modern production systems, building APIs and services, and collaborating with cross-functional teams to deliver reliable and user-focused products. Key Responsibilities * Build prototypes and evolve them into scalable, production-ready applications * Develop and maintain backend services and APIs in Node/Python * Contribute to frontend development, building responsive and intuitive user interfaces in React * Design and implement data workflows and system integrations * Work with cloud infrastructure and distributed systems
Job Title: Java Developer - Rate: £400 (InsideIR35) Duration: 12 Months - Location: Remote - Clearance: BPSS - Stages: 1 Stage - Must Have Government Experience - Key Responsibilities * Design, develop, and maintain Java applications in line with digital and engineering standards * Build and supportmicroservicesandRESTful APIs * Collaborate with product owners, designers, testers, and DevOps engineers in agile teams * Write clean, maintainable, and well-tested code (TDD/BDD where applicable) * Participate in code reviews and contribute to continuous improvement * Ensure applications meetsecurity, accessibility, and performancestandards * Troubleshoot and resolve defects across development and production environments * Support CI/CD pipelines and automated deployment processes - Essential Skills & Experience * Strong commercial experience withJava (Java 8+)
Job Title: Java Developer - Rate: £400 (InsideIR35) Duration: 12 Months - Location: Remote - Clearance: BPSS - Stages: 1 Stage - Must Have Government Experience - Key Responsibilities * Design, develop, and maintain Java applications in line with digital and engineering standards * Build and supportmicroservicesandRESTful APIs * Collaborate with product owners, designers, testers, and DevOps engineers in agile teams * Write clean, maintainable, and well-tested code (TDD/BDD where applicable) * Participate in code reviews and contribute to continuous improvement * Ensure applications meetsecurity, accessibility, and performancestandards * Troubleshoot and resolve defects across development and production environments * Support CI/CD pipelines and automated deployment processes - Essential Skills & Experience * Strong commercial experience withJava (Java 8+)
Scala Developer – 12-Month Contract (Outside IR35)
Scala Developer – 12-Month Contract (Outside IR35)
Stealth IT Consulting Limited
UK
£450 per day £450 per day (Outside IR35)
£450 per day Fully Remote (UK-based) Occasional Out-of-Hours Work Required Im supporting a long-term programme looking for an experienced Scala Developer to join a high-performing engineering team on a 12-month Outside IR35 contract. * Strong commercial experience with Scala * Experience building high-quality, scalable backend services * Exposure to microservices, REST APIs, functional programming * Strong understanding of CI/CD and modern engineering practices * Cloud experience (AWS ideally) * Able to support occasional out-of-hours work when required?? * £450/day (Outside IR35) * 12 months * Remote * Immediate interviews & quick onboarding If youre available and interested, drop me a message or send over your CV.
£450 per day Fully Remote (UK-based) Occasional Out-of-Hours Work Required Im supporting a long-term programme looking for an experienced Scala Developer to join a high-performing engineering team on a 12-month Outside IR35 contract. * Strong commercial experience with Scala * Experience building high-quality, scalable backend services * Exposure to microservices, REST APIs, functional programming * Strong understanding of CI/CD and modern engineering practices * Cloud experience (AWS ideally) * Able to support occasional out-of-hours work when required?? * £450/day (Outside IR35) * 12 months * Remote * Immediate interviews & quick onboarding If youre available and interested, drop me a message or send over your CV.
FEATURED