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3 Contract API jobs in West Yorkshire + 20 miles
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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.
FEATURED
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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
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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
7 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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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
FEATURED
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
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.
FEATURED
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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.
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Role: DevOps Engineer We currently are on the look out for eDV cleared DevOps professionals to join our National Security sector. Location: Cheltenham or London - Contract duration: 6-12 months - Clearance level: eDV - We provide talent solutions for the UK government and their critical supply chains. * Design and develop innovative cloud-native platforms and applications using AWS, data engineering, and CI/CD practices. * Implement and optimize Java, JavaScript, React, and other relevant technologies for full-stack applications. * Contribute to batch analytics, Python, and data engineering efforts. * Ensure platform and application resilience through effective monitoring and alerting with Prometheus, Grafana, Nagios, and Elasticsearch. * Participate in agile development processes, including sprint planning, daily stand-ups, and code reviews. * Apply SRE principles to improve system reliability and performance.
Role: DevOps Engineer We currently are on the look out for eDV cleared DevOps professionals to join our National Security sector. Location: Cheltenham or London - Contract duration: 6-12 months - Clearance level: eDV - We provide talent solutions for the UK government and their critical supply chains. * Design and develop innovative cloud-native platforms and applications using AWS, data engineering, and CI/CD practices. * Implement and optimize Java, JavaScript, React, and other relevant technologies for full-stack applications. * Contribute to batch analytics, Python, and data engineering efforts. * Ensure platform and application resilience through effective monitoring and alerting with Prometheus, Grafana, Nagios, and Elasticsearch. * Participate in agile development processes, including sprint planning, daily stand-ups, and code reviews. * Apply SRE principles to improve system reliability and performance.
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Senior Software Engineer, £500/day (Outside IR35)
Senior Software Engineer, £500/day (Outside IR35)
Morson Edge
City Centre, Manchester (M2), m1
£400 - 500 per day
Opportunity for a Senior Software Engineer to work for a retail company near Manchester going through a large digital transformation. This is an initial 6-month contract outside IR35 to help deliver re-platforming of existing systems to a cloud-native, event-driven, microservices architecture. * TypeScript (Node & React) * AWS * Event-driven MACH architecture * CI/CD - In return they're offering an initial 6-month outside IR35 contract paying up to £500/day. Please note this role is onsite 1-2 days per week. If you're interested and would like to know more, please apply through this advert and I'll be in touch.
Opportunity for a Senior Software Engineer to work for a retail company near Manchester going through a large digital transformation. This is an initial 6-month contract outside IR35 to help deliver re-platforming of existing systems to a cloud-native, event-driven, microservices architecture. * TypeScript (Node & React) * AWS * Event-driven MACH architecture * CI/CD - In return they're offering an initial 6-month outside IR35 contract paying up to £500/day. Please note this role is onsite 1-2 days per week. If you're interested and would like to know more, please apply through this advert and I'll be in touch.
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Solution Architect 6 Months - We are looking for a seasoned Architect to contribute to the architecture and design of a microservices platform. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients. £625 - £680 - OUTSIDE OF IR35 - Hybrid working in the South West - The ideal candidate will come from a .NET background and worked with AWS. You will be involved in examining existing systems for improvement and integration and documenting technical designs, processes and implementations using flowcharts, sequence diagrams, and other UML diagrams in confluence where relevant. Experience and skills required. * Experience designing and documenting Microservice architectures * Strong Integration background * Cloud experience in AWS. * Experience designing and implementing enterprise business critical, high volume, scalable, high ...
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We're looking for a DevOps Engineer with database expertise to join our Site Reliability team and drive automation and tooling to manage, scale, and maintain our databases. * Developing self-service database tools used by over 1k+ engineers * Leading and supporting incident response for production database issues, ensuring reliability and fast recovery * Building and optimising automation for database provisioning, scaling, and maintenance * Knowledge of database security, including TLS setup, roles, auditing, and encryption at rest/in transit * Experience using Consul for highly available database clusters * Knowledge of Java and Python database drivers - About Revolut - People deserve more from their money. More visibility, more control, and more freedom. Since 2015, Revolut has been on a mission to deliver just that. Our powerhouse of products including spending, saving, investing, exchanging, travelling, ...
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Senior JavaScript Developer
Senior JavaScript Developer
SCALERS GROUP LIMITED
The City, City of London (EC4), EC4N 6AP
From £600 to £650 per day
We are looking for a Senior Full Stack JavaScript Engineer to join their collaborative tech team. * Develop and maintain scalable, high-quality JavaScript (ReactJS/TypeScript) code - Scalers HQ is proud to be partnering with an innovative and fast-growing Media organisation in London. You'll play a key role in delivering cutting-edge AdTech analytics solutions, reporting directly to the Head of Engineering. This is a fantastic opportunity to work in a high-impact environment alongside experienced engineers and product specialists, helping to shape the future of media technology. Key Responsibilities * Collaborate closely with engineering and product teams to deliver new features and tools * Contribute to backend services using Node.js * Work with systems such as Redux for efficient state management * Ensure code quality through testing frameworks * Build and deploy using AWS cloud infrastructure
We are looking for a Senior Full Stack JavaScript Engineer to join their collaborative tech team. * Develop and maintain scalable, high-quality JavaScript (ReactJS/TypeScript) code - Scalers HQ is proud to be partnering with an innovative and fast-growing Media organisation in London. You'll play a key role in delivering cutting-edge AdTech analytics solutions, reporting directly to the Head of Engineering. This is a fantastic opportunity to work in a high-impact environment alongside experienced engineers and product specialists, helping to shape the future of media technology. Key Responsibilities * Collaborate closely with engineering and product teams to deliver new features and tools * Contribute to backend services using Node.js * Work with systems such as Redux for efficient state management * Ensure code quality through testing frameworks * Build and deploy using AWS cloud infrastructure
The Senior lead Scala Engineer will play a key role in the engineering and delivery of a critical market-infrastructure service within the Equities platform, with a strong focus on AWS cloud-native development. Reporting directly to the Senior Technical Delivery Engineer, Post Trade, the successful candidate will be responsible for designing, implementing, and maintaining performant, resilient, and scalable backend services built predominantly in Scala. As a senior member of the engineering team, this individual will help shape technical direction, contribute to best-in-class engineering standards, and actively support the continued growth and evolution of the business. Advanced Scala programming * Proven experience delivering enterprise-grade Scala applications in production environments, with a focus on quality, resilience, performance, and observability. Role Profile
The Senior lead Scala Engineer will play a key role in the engineering and delivery of a critical market-infrastructure service within the Equities platform, with a strong focus on AWS cloud-native development. Reporting directly to the Senior Technical Delivery Engineer, Post Trade, the successful candidate will be responsible for designing, implementing, and maintaining performant, resilient, and scalable backend services built predominantly in Scala. As a senior member of the engineering team, this individual will help shape technical direction, contribute to best-in-class engineering standards, and actively support the continued growth and evolution of the business. Advanced Scala programming * Proven experience delivering enterprise-grade Scala applications in production environments, with a focus on quality, resilience, performance, and observability. Role Profile
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A leading global financial services organisation is seeking a Senior Java Developer (Contract) to join its Electronic Fixed Income (eFI) Technology team. Level: Senior / VP-equivalent individual contributor - This role sits in a front-office electronic trading environment, focused on building and optimising low-latency, high-performance Java trading systems used by institutional clients. * Strong low-latency Java development experience * Deep knowledge of Core Java, concurrency, and multi-threaded design - Location: London - Contract Type: Inside IR35 - Day Rate: Competitive (via umbrella) Contract Length: Initial 6 months (extension likely) Working Model: Hybrid - Overview - A core part of the engagement will be supporting the rollout and optimisation of TransFICC connectivity, alongside ongoing performance improvements across pricing, RFQ, execution, and market-data workflows. Required Experience
A leading global financial services organisation is seeking a Senior Java Developer (Contract) to join its Electronic Fixed Income (eFI) Technology team. Level: Senior / VP-equivalent individual contributor - This role sits in a front-office electronic trading environment, focused on building and optimising low-latency, high-performance Java trading systems used by institutional clients. * Strong low-latency Java development experience * Deep knowledge of Core Java, concurrency, and multi-threaded design - Location: London - Contract Type: Inside IR35 - Day Rate: Competitive (via umbrella) Contract Length: Initial 6 months (extension likely) Working Model: Hybrid - Overview - A core part of the engagement will be supporting the rollout and optimisation of TransFICC connectivity, alongside ongoing performance improvements across pricing, RFQ, execution, and market-data workflows. Required Experience
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Senior Backend Engineer | High-Growth Cybersecurity Scale-Up | Fully Remote (UK based) As aSenior Backend Engineer, youll play a key role in building scalable, high-performance backend systems that ingest, process, and serve data on millions of assetshelping global security teams uncover exposures before attackers do. * Designing and building backend services and data pipelines powering a cutting-edge cybersecurity platform * Working closely with product and frontend teams to integrate backend services into the platform experience * 5+ years experience designing and maintaining mission-critical backend applications * Strong Python engineering skills, with a track record of building performant, maintainable, and testable systems - This is more than a backend engineering role its a chance to be part of a team building technology that helps some of the worlds largest enterprises stay ...
Senior Backend Engineer | High-Growth Cybersecurity Scale-Up | Fully Remote (UK based) As aSenior Backend Engineer, youll play a key role in building scalable, high-performance backend systems that ingest, process, and serve data on millions of assetshelping global security teams uncover exposures before attackers do. * Designing and building backend services and data pipelines powering a cutting-edge cybersecurity platform * Working closely with product and frontend teams to integrate backend services into the platform experience * 5+ years experience designing and maintaining mission-critical backend applications * Strong Python engineering skills, with a track record of building performant, maintainable, and testable systems - This is more than a backend engineering role its a chance to be part of a team building technology that helps some of the worlds largest enterprises stay ...