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2 Contract API jobs in New Milton + 20 miles
Familiarity with API management tools * Use tools and scripting such as AWS Lambda, Bash , and API management platforms
Familiarity with API management tools * Use tools and scripting such as AWS Lambda, Bash , and API management platforms
NEW
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving.
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving.
42 exact matches jobs are outside your preferred location
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We are working with an engineering led organisation delivering specialist technology solutions across infrastructure environments. They are seeking a Contract Software Engineer to take ownership of a live device configuration tool and deliver it through to completion, based at their head office in Chandlers Ford. This is a hands on delivery role focused on stabilising and enhancing an existing application, followed by contributing to a wider Azure based IoT platform. You will work closely with internal stakeholders to solve technical challenges and deliver robust, production ready solutions. Key Responsibilities * Take ownership of an in progress configuration tool and deliver to production. * Extend and improve an existing .NET WinForms application. * Integrate device APIs to automate provisioning and configuration workflows.
We are working with an engineering led organisation delivering specialist technology solutions across infrastructure environments. They are seeking a Contract Software Engineer to take ownership of a live device configuration tool and deliver it through to completion, based at their head office in Chandlers Ford. This is a hands on delivery role focused on stabilising and enhancing an existing application, followed by contributing to a wider Azure based IoT platform. You will work closely with internal stakeholders to solve technical challenges and deliver robust, production ready solutions. Key Responsibilities * Take ownership of an in progress configuration tool and deliver to production. * Extend and improve an existing .NET WinForms application. * Integrate device APIs to automate provisioning and configuration workflows.
We are proud of our market leading integrations estate, and our Open API capabilities, and continue to build on these with our * Open API for customers, ecosystem partners and Advice firms * Propose and lead on business and partnership models (license, tiered API, embedded UX, or per-event pricing)
We are proud of our market leading integrations estate, and our Open API capabilities, and continue to build on these with our * Open API for customers, ecosystem partners and Advice firms * Propose and lead on business and partnership models (license, tiered API, embedded UX, or per-event pricing)
Knowledge of creation of API documentation using YAML specifications.
Knowledge of creation of API documentation using YAML specifications.
Location: Reading, UK - Publish Date: 11/12 /2025 - If you apply, please include your CV. Overview - CHAMP Cargosystems provides the most comprehensive range of integrated IT solutions and distribution services for the air cargo transport chain. Our portfolio spans core management systems, messaging services, and eCargo solutions. These include applications designed to meet customs and security requirements, quality optimization, as well as e-freight and mobility needs. Our products and services are recognized globally under the Cargospot and Traxon brands. We serve over 200 airlines and GSAs, connecting them with approximately 3,000 forwarders and GHAs worldwide. Our solutions help customers, and their clients, adapt to the critical and ongoing changes in air transport logistics and meet the demands of global trade.
Location: Reading, UK - Publish Date: 11/12 /2025 - If you apply, please include your CV. Overview - CHAMP Cargosystems provides the most comprehensive range of integrated IT solutions and distribution services for the air cargo transport chain. Our portfolio spans core management systems, messaging services, and eCargo solutions. These include applications designed to meet customs and security requirements, quality optimization, as well as e-freight and mobility needs. Our products and services are recognized globally under the Cargospot and Traxon brands. We serve over 200 airlines and GSAs, connecting them with approximately 3,000 forwarders and GHAs worldwide. Our solutions help customers, and their clients, adapt to the critical and ongoing changes in air transport logistics and meet the demands of global trade.
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API Integration Developer - Remote - £400+ per day
API Integration Developer - Remote - £400+ per day
Exalto Consulting ltd
Other
£400+ per day Inside IR35
API Integration Developer - Exalto Consulting are working with a client on a large-scale integration migration programme and is looking to bring in experienced API Integration Developers. You’ll be working across a mix of API-led and file-based integrations, helping to design, build and transition services in a way that is stable, clear and aligned with the wider platform architecture. * Building and supporting REST API integrations between systems * Working across both real-time (API) and file-based (SFTP/MFT) integration workflows * Strong experience building REST API integrations (typically 5+ years)
API Integration Developer - Exalto Consulting are working with a client on a large-scale integration migration programme and is looking to bring in experienced API Integration Developers. You’ll be working across a mix of API-led and file-based integrations, helping to design, build and transition services in a way that is stable, clear and aligned with the wider platform architecture. * Building and supporting REST API integrations between systems * Working across both real-time (API) and file-based (SFTP/MFT) integration workflows * Strong experience building REST API integrations (typically 5+ years)
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Integration with SFTP, API-based connections, and secure channels
Integration with SFTP, API-based connections, and secure channels
Hands on experience in implementing API, Micro-services and application security
Hands on experience in implementing API, Micro-services and application security
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...
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• Understanding of Microsoft Graph, automation tooling, and API?based platform integrations.
• Understanding of Microsoft Graph, automation tooling, and API?based platform integrations.
PREMIUM
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Define integration architecture (API-led, event-driven architecture)
Define integration architecture (API-led, event-driven architecture)
Understanding of databases and API integrations
Understanding of databases and API integrations
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Contract Solution Architect SaaS / Integration / Identity - Midlands (Hybrid Working) Up to £750 per day (Inside IR35) 6-Month Initial Contract | Immediate Start - Active SC Clearance Required - We are supporting a globally recognised engineering and technology organisation operating at the forefront of advanced aerospace, defence, and power systems. They are seeking an experienced Solution Architect to support a major enterprise SaaS platform programme within a highly secure environment. This role will be instrumental in designing end-to-end architectures and ensuring new platforms integrate securely and effectively within a complex enterprise landscape. As a Solution Architect, you will assess the current technology landscape and produce high-level architectural designs that enable secure and scalable SaaS platform implementations.
Contract Solution Architect SaaS / Integration / Identity - Midlands (Hybrid Working) Up to £750 per day (Inside IR35) 6-Month Initial Contract | Immediate Start - Active SC Clearance Required - We are supporting a globally recognised engineering and technology organisation operating at the forefront of advanced aerospace, defence, and power systems. They are seeking an experienced Solution Architect to support a major enterprise SaaS platform programme within a highly secure environment. This role will be instrumental in designing end-to-end architectures and ensuring new platforms integrate securely and effectively within a complex enterprise landscape. As a Solution Architect, you will assess the current technology landscape and produce high-level architectural designs that enable secure and scalable SaaS platform implementations.
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Senior Full Stack Engineer (Python Focused) Outisde IR35 up to £525 - Intial 6 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 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
Senior Full Stack Engineer (Python Focused) Outisde IR35 up to £525 - Intial 6 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 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
Senior Full Stack Engineer - Outisde IR35 up to £525 - Intial 6 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
Senior Full Stack Engineer - Outisde IR35 up to £525 - Intial 6 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
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Location: UK / Remote / Hybrid - Contract Type: Contract / Interim - About the Role - We are seeking Developers across multiple specialisms to join multidisciplinary digital teams within central government. You will help design, build and support high-quality, user-centred digital services delivered in line with GDS and modern engineering practices. Key Responsibilities * Build, test, deploy and iterate secure digital services across discovery, alpha, beta and live phases. * Collaborate closely with designers, user researchers, content designers, product managers and delivery teams to create user-centred solutions. * Apply government-wide accessibility and inclusive design standards to ensure services work for all users. * Support live service operations, including monitoring, troubleshooting and continual improvement.
Location: UK / Remote / Hybrid - Contract Type: Contract / Interim - About the Role - We are seeking Developers across multiple specialisms to join multidisciplinary digital teams within central government. You will help design, build and support high-quality, user-centred digital services delivered in line with GDS and modern engineering practices. Key Responsibilities * Build, test, deploy and iterate secure digital services across discovery, alpha, beta and live phases. * Collaborate closely with designers, user researchers, content designers, product managers and delivery teams to create user-centred solutions. * Apply government-wide accessibility and inclusive design standards to ensure services work for all users. * Support live service operations, including monitoring, troubleshooting and continual improvement.
PREMIUM
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+)
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Location: Remote - Duration: 12 months with possible extension - Rate: Up to £550 per day via an approved umbrella company - Must be willing and eligible to go through the SC Clearance process - Our client, a reputable organisation in the IT sector, is hiring for a skilled SC Cleared Salesforce Developer to join a dynamic team on a 12-month contract, with the possibility of extension. This is an excellent opportunity to work on high-profile projects remotely, supporting critical infrastructure. * Developing and customising Salesforce solutions using Apex, Visualforce, and Lightning Components. * Designing and implementing Salesforce architecture, including data models, workflows, and business processes. * Configuring Salesforce environments, including setup, integrations, and customisations. * Troubleshooting complex technical issues and debugging code to ensure optimal performance.
Location: Remote - Duration: 12 months with possible extension - Rate: Up to £550 per day via an approved umbrella company - Must be willing and eligible to go through the SC Clearance process - Our client, a reputable organisation in the IT sector, is hiring for a skilled SC Cleared Salesforce Developer to join a dynamic team on a 12-month contract, with the possibility of extension. This is an excellent opportunity to work on high-profile projects remotely, supporting critical infrastructure. * Developing and customising Salesforce solutions using Apex, Visualforce, and Lightning Components. * Designing and implementing Salesforce architecture, including data models, workflows, and business processes. * Configuring Salesforce environments, including setup, integrations, and customisations. * Troubleshooting complex technical issues and debugging code to ensure optimal performance.
FEATURED
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Were looking for an experienced AI Engineer to build and scale GenAI-powered document intelligence systems on GCP. What Youll Do * Build LLM-driven document intelligence using Gemini on Vertex AI, including advanced prompt engineering and model orchestration. * Extract and normalise data from legal documents (tables, clauses, signatures, covenants, payment waterfalls). * Automate checklist-based analysis with strong validation and citation logic (No Page, No Claim). * Design robust evaluation frameworks (accuracy, bias, drift) with human-in-the-loop review. * Deliver production APIs (REST/gRPC) and high-throughput ingestion pipelines. * Create multimodal ingestion workflows for PDFs, scans, images, Excel and emails with OCR. Tech Stack * GCP: Vertex AI, Cloud Run, Pub/Sub, Dataflow * LLMs: Gemini, LangChain / LlamaIndex * Languages: Python (primary), TypeScript
Were looking for an experienced AI Engineer to build and scale GenAI-powered document intelligence systems on GCP. What Youll Do * Build LLM-driven document intelligence using Gemini on Vertex AI, including advanced prompt engineering and model orchestration. * Extract and normalise data from legal documents (tables, clauses, signatures, covenants, payment waterfalls). * Automate checklist-based analysis with strong validation and citation logic (No Page, No Claim). * Design robust evaluation frameworks (accuracy, bias, drift) with human-in-the-loop review. * Deliver production APIs (REST/gRPC) and high-throughput ingestion pipelines. * Create multimodal ingestion workflows for PDFs, scans, images, Excel and emails with OCR. Tech Stack * GCP: Vertex AI, Cloud Run, Pub/Sub, Dataflow * LLMs: Gemini, LangChain / LlamaIndex * Languages: Python (primary), TypeScript
Location: Remote (UK / Europe) Rate: £400 £500 per day (Outside IR35) Duration: 6 Months - Start Date: ASAP - Company: 167 Solutions Ltd (on behalf of a global client) Overview - 167 Solutions Ltd is hiring a Salesforce Developer (Contract) to support a large-scale Salesforce transformation programme. This is a fully remote opportunity working within an enterprise environment across multiple Salesforce Clouds. Key Responsibilities * Design, develop and implement Salesforce solutions using Apex and Lightning Web Components (LWC) * Customise Salesforce across Sales Cloud, Service Cloud and Experience Cloud * Build and maintain integrations using REST/SOAP APIs * Work closely with Architects, Consultants and stakeholders to deliver scalable solutions * Support data migration, data modelling and system optimisation * Follow Salesforce best practices, CI/CD and deployment processes
Location: Remote (UK / Europe) Rate: £400 £500 per day (Outside IR35) Duration: 6 Months - Start Date: ASAP - Company: 167 Solutions Ltd (on behalf of a global client) Overview - 167 Solutions Ltd is hiring a Salesforce Developer (Contract) to support a large-scale Salesforce transformation programme. This is a fully remote opportunity working within an enterprise environment across multiple Salesforce Clouds. Key Responsibilities * Design, develop and implement Salesforce solutions using Apex and Lightning Web Components (LWC) * Customise Salesforce across Sales Cloud, Service Cloud and Experience Cloud * Build and maintain integrations using REST/SOAP APIs * Work closely with Architects, Consultants and stakeholders to deliver scalable solutions * Support data migration, data modelling and system optimisation * Follow Salesforce best practices, CI/CD and deployment processes
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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
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Rest API Integration
Rest API Integration
Focus on API management and 3GPP protocols . * Experience with RESTful API design, documentation, development, testing, and debugging.
Focus on API management and 3GPP protocols . * Experience with RESTful API design, documentation, development, testing, and debugging.
API-focused testing * Design and execute manual API tests using tools such as Postman, curl, or similar. * Chain API calls to simulate realistic workflows and ensure correct behaviour independent of the UI. * Identify gaps in API behaviour, validation, and documentation based on real-world usage patterns. * Participate in refinement, planning, and design discussions to surface testability and quality concerns early, particularly around API contracts and UI/API interactions. * Collaborate with engineers to clarify expected behaviour, edge cases, and acceptance criteria for both UI and API changes. * Translate requirements, user flows, and API specifications into structured test conditions and scenarios. * Reproduce, investigate, and document issues with clear steps, including failing UI flows and/or API requests and responses. * Verify fixes at both the API and UI layer, checking for ...
API-focused testing * Design and execute manual API tests using tools such as Postman, curl, or similar. * Chain API calls to simulate realistic workflows and ensure correct behaviour independent of the UI. * Identify gaps in API behaviour, validation, and documentation based on real-world usage patterns. * Participate in refinement, planning, and design discussions to surface testability and quality concerns early, particularly around API contracts and UI/API interactions. * Collaborate with engineers to clarify expected behaviour, edge cases, and acceptance criteria for both UI and API changes. * Translate requirements, user flows, and API specifications into structured test conditions and scenarios. * Reproduce, investigate, and document issues with clear steps, including failing UI flows and/or API requests and responses. * Verify fixes at both the API and UI layer, checking for ...