18 api developer jobs found

Senior .NET / Full Stack Developer – Hybrid – £600/day Outside IR35 | C# | Azure | Event-Driven Systems | Payments | API-Driven We have a unique opportunity for a Senior .NET / Full Stack Developer to join a payments company. As a Senior .NET / Full Stack Developer , you’ll play a key role in building and scaling a high-throughput payments platform as the business enters its next phase of growth. This includes launching new products, enabling new partner integrations, and expanding a platform that already powers multiple live financial services products used globally. You’ll be building on top of a modern, cloud-native platform built with .NET and Azure , designed around API-first architecture and event-driven microservices . The platform supports complex payment flows, partner integrations, and high-volume transaction processing. This is a hands-on senior engineering role where you’ll contribute to architectural discussions, drive engineering best...

ComfyUI Workflow Developer | London | Remote-Friendly | £500 - £600 We're working with a high-end creative agency specializing in hyper-realistic CGI for global luxury brands on this exciting opportunity. We are looking for a technical visionary to bridge the gap between AI experimentation and high-end production pipelines . This role is about more than just generating pretty images; it’s about engineering robust, scalable AI architectures using ComfyUI, Python, and Stable Diffusion to meet the exacting standards of the luxury market. You will move from a high-impact POC sprint into a full-scale production deployment, automating asset generation that rivals traditional CG I. The R ole• Architect and build advanced ComfyUI workflows capable of generating high-resolution, brand-compliant assets at sca le.• Develop custom Python scripts and API integrations to connect AI pipelines with existing Digital Asset Management (DAM) syste ms.• Transition from a 4-week...

Java Developer - SC Cleared Location: London (1–2 days onsite per month) Contract: Outside IR35 Rate: £600–£675 per day Duration: 12 Month Contract Start: Immediate / Short Notice Preferred Eligibility: Active SC Clearance required (DV clearance ideally) Overview An experienced Java Developer is required to build and maintain scalable, high-performance applications within a secure public sector environment. Requirements Strong experience with Java & Springboot Solid Java back-end development experience Experience working in public sector Strong understanding of API integration and system design Active SC Clearance required (DV clearance ideally)

Java Developer - SC Cleared Location: London (1-2 days onsite per month) Contract: Outside IR35 Rate: £600-£675 per day Duration: 12 Month Contract Start: Immediate/Short Notice Preferred Eligibility: Active SC Clearance required (DV clearance ideally) Overview An experienced Java Developer is required to build and maintain scalable, high-performance applications within a secure public sector environment. Requirements Strong experience with Java & Springboot Solid Java Back End development experience Experience working in public sector Strong understanding of API integration and system design Active SC Clearance required (DV clearance ideally)

Vue.Js, JavaScript, Vuetify, API, XSS, CSRF, Vite, Webpack, GitHub, AWS, Cognito, Firebase 3-month contract role. Outside IR35. £500 per day. Must be a UK based candidate. No visa sponsorship or visa transfer. Experience within Healthcare, Pharma or Life Sciences is a definite advantage. The role will involve the following: Lead the migration from Vue.js 2 to Vue.js 3 with Composition API Migrate Vuetify 2 components to Vuetify 3 Implement frontend security best practices (CSP headers, XSS prevention) Upgrade Node.js runtime Evaluate and implement Vite as the build tool Establish testing practices using Vitest and Vue Test Utils Optimise build performance with code splitting and lazy loading Work alongside a backend developer on API integration To start ASAP. Please email a CV to Roger at Jump IT in the first instance.

.Net 6, .Net 10, C#, ASP.NET, .NET Core, AWS, CDK, IaC, Cognito, S3, KMS, CI/CD, Docker, Containers, Entity, Firebase 3-month contract role. Outside IR35. £500 per day. Must be a UK based candidate. No visa sponsorship or visa transfer. Experience within Healthcare, Pharma or LifeSciences is a definite advantage. The role will involve the following: Migrate the platform to .NET 10 LTS Implement secrets management using AWS Secrets Manager Strengthen authentication and authorisation mechanisms Enhance audit trail and compliance features for healthcare regulations Improve API security, including rate limiting and CORS configuration Update Docker containers and CI/CD pipelines Establish and expand unit and integration test coverage Work with Clean Architecture patterns across the solution To start ASAP. Please email a CV to Roger at Jump IT in the first instance.

Boomi Integration Developer - Contract Overview We are looking for an experienced Boomi Integration Developer to support a series of integration projects. This is a 3‑month contract, fully remote, and operating outside IR35. Key Responsibilities * Design, develop, and maintain integrations using the Boomi platform * Work closely with internal teams to understand integration requirements * Troubleshoot and optimise existing Boomi processes * Support project delivery across multiple systems and data sources * Ensure best practice, documentation, and smooth handover at the end of the engagement Requirements * Proven experience as a Boomi Integration Developer * Strong understanding of integration patterns and API development * Ability to work independently and deliver in a fast‑paced environment * Excellent communication and problem‑solving skills * Boomi certifications beneficial but not essential Contract Details * Length: 3 months * Location: Remote * IR35 Status: Outside IR35...

Boomi Integration Developer - Contract Overview We are looking for an experienced Boomi Integration Developer to support a series of integration projects. This is a 3-month contract, fully remote, and operating outside IR35. Key Responsibilities * Design, develop, and maintain integrations using the Boomi platform * Work closely with internal teams to understand integration requirements * Troubleshoot and optimise existing Boomi processes * Support project delivery across multiple systems and data sources * Ensure best practice, documentation, and smooth handover at the end of the engagement Requirements * Proven experience as a Boomi Integration Developer * Strong understanding of integration patterns and API development * Ability to work independently and deliver in a fast-paced environment * Excellent communication and problem-solving skills * Boomi certifications beneficial but not essential Contract Details * Length: 3 months * Location: Remote * IR35 Status: Outside IR35...

Boomi Integration Developer - Contract Overview We are looking for an experienced Boomi Integration Developer to support a series of integration projects. This is a 3-month contract, fully remote, and operating outside IR35. Key Responsibilities * Design, develop, and maintain integrations using the Boomi platform * Work closely with internal teams to understand integration requirements * Troubleshoot and optimise existing Boomi processes * Support project delivery across multiple systems and data sources * Ensure best practice, documentation, and smooth handover at the end of the engagement Requirements * Proven experience as a Boomi Integration Developer * Strong understanding of integration patterns and API development * Ability to work independently and deliver in a fast-paced environment * Excellent communication and problem-solving skills * Boomi certifications beneficial but not essential Contract Details * Length: 3 months * Location: Remote * IR35 Status: Outside IR35...

Mulesoft Developer - Outside IR35 - 6 months We're looking for an experienced MuleSoft Developer to support an integration programme connecting enterprise systems including CRM and ERP platforms. You'll be responsible for designing and building integrations using the MuleSoft Anypoint Platform, working closely with internal teams to deliver API-led integrations and improve system interoperability. Key responsibilities Develop and maintain integrations using MuleSoft Build and document APIs using the Anypoint platform Support integration architecture and API specifications Debug, troubleshoot and resolve integration issues Write unit tests and maintain clean, well-structured code Support integration testing and deployment Experience required Strong hands-on experience with MuleSoft/Anypoint Platform Experience building API-led integrations Experience integrating CRM and ERP platforms Strong API, REST and...

SharePoint / Microsoft 365 Application Developer required by our market leading client in Bristol. This will be a 3 month initial contract, likely to extend and will sit Outside IR35 . We are looking for an experienced SharePoint / Microsoft 365 Application Developer to support ongoing digital transformation projects. This is a hands-on role requiring strong technical expertise, problem-solving skills, and the ability to deliver independently in a fast-paced environment. Key Responsibilities: Design, develop, and maintain SharePoint Online sites, libraries, lists, and workflows. Build custom solutions using Power Apps, Power Automate, and PowerShell. Develop modern SharePoint components using SPFx (SharePoint Framework). Integrate Microsoft 365 services including Teams, OneDrive, Azure AD, and Exchange Online. Migrate content from legacy SharePoint or file systems into SharePoint Online. Create reusable templates, components, and...

Position: App Developer Location: Vauxhall/Stratford Day Rate: £600 p.d Outside IR35 Must hold active DV clearance A central government department is looking for an experienced App Developer to join a high-security programme. This role requires working on-site 5 days per week in Vauxhall, moving later to Stratford later on in the project. Due to the nature of the work, candidates hold UKSV DV clearance. Key Skills & Experience Strong expertise in Python, Docker, Kubernetes, and Data Governance Experience working in air-gapped environments, including managing dependencies and build pipelines without Internet access Proven background building APIs for data enrichment services Orchestration & data pipeline experience with Prefect or Airflow, and K8s or Swarm Configuration and automation of business workflow tooling (eg, Jira) Hands-on experience with a range of databases and storage technologies: Elastic, Mongo, Cassandra, Redis, S3 Desirable Skills...

Position: App Developer Location: Vauxhall / Stratford Day Rate: £600 p.d Outside IR35 Must hold active DV clearance A central government department is looking for an experienced App Developer to join a high-security programme. This role requires working on-site 5 days per week in Vauxhall, moving later to Stratford later on in the project. Due to the nature of the work, candidates hold UKSV DV clearance. Key Skills & Experience Strong expertise in Python, Docker, Kubernetes, and Data Governance Experience working in air-gapped environments, including managing dependencies and build pipelines without internet access Proven background building APIs for data enrichment services Orchestration & data pipeline experience with Prefect or Airflow, and K8s or Swarm Configuration and automation of business workflow tooling (e.g., Jira) Hands-on experience with a range of databases and storage technologies: Elastic, Mongo, Cassandra, Redis, S3 Desirable Skills...

AI Engineer (Contract) – £500/day Outside IR35 📍 Canary Wharf, London (3 days onsite) 🇬🇧 UK-based applicants only We’re looking for experienced AI Engineers who think holistically, automate relentlessly, and know how to turn modern AI capabilities into production-grade, high-impact applications . Our AI organisation is building real-world AI products that deliver business value at speed. This role is ideal for seasoned engineers who combine strong software engineering fundamentals with a pragmatic, hands-on approach to AI tooling and infrastructure. What you’ll be doing Designing, building, and maintaining production-grade AI applications using modern engineering practices (CI/CD, testing, observability, cloud-native design). Developing reusable AI platforms and tools (e.g. conversational bots, AI-powered search, unstructured data processing, GenAI solutions). Working in cross-functional, embedded teams with business stakeholders to rapidly deliver...

IFS Cloud Consultant £600 - £700 per day | Outside IR35 Initial 12-month contract Hybrid role - St Albans (site presence required) IFS Cloud Consultant - Outside IR35 - St Albans TalentBank Technology is supporting a leading organisation within the energy and utilities sector to engage an experienced IFS Cloud Consultant on an initial 12-month contract. This role combines technical leadership, hands-on delivery, and functional expertise across a globally distributed IFS Cloud platform. The successful consultant will work closely with IT leaders, developers, architects, and functional teams to drive platform standardisation, technical excellence, and governance across security, data management, release management, and environment management. Key Responsibilities Define and implement best practices for IFS Cloud security and permissions architecture. Lead release and deployment management including updates, patches, integrations, and configurations. Oversee...

Technical Program Manager - Platform/Data/Infrastructure Outside IR35 SOLE AGENT Location: London (5 days onsite) Our client, a leading global investment firm is seeking a senior Technical Program Manager to lead large-scale engineering programmes across data platforms, cloud infrastructure and internal developer platforms. You will sit at the centre of complex technology initiatives, working with senior engineering leaders to deliver critical platform capabilities used across the business. Your Skills Strong Technical Program Management background within complex engineering environments Experience delivering large cross-team software, platform or infrastructure programmes Technical fluency with system design, APIs, data flows and cloud platforms Strong stakeholder management with engineering leadership Ability to operate in fast-moving, technically complex organisations Types of Programmes Platform and infrastructure modernisation...

Job Title: Test Architect / Test Technical SME – ERP (Infor ideally) manuafacturing On site near Belfast 2/3 days per week, all travel expenses paid by the client Outside IR35 Role Summary We are seeking a highly skilled Test Technical SME with strong experience Manufacturing ERP systems . This role will act as the technical authority for testing activities, providing guidance on test design, automation, tools, and complex ERP integrations rather than owning overall test strategy. ⸻ Key Responsibilities   •  Act as the technical SME for testing across Infor ERP implementations and enhancements.   •  Provide hands-on expertise in testing Infor modules (M3 / LN / CloudSuite).   •  Support complex testing for business processes (Manufacturing, Supply Chain, Quality, Compliance).   •  Design and review test frameworks, automation solutions, and test assets.   •  Guide teams on test tools, standards, and best practices.   •  Troubleshoot complex test and...

Role: Azure DevOps Engineer OUTSIDE IR35 Valid SC Clearance required Travel: 2 days a week on-site in Milton Keynes OUTSIDE IR35 We are seeking a skilled Azure DevOps Engineer with strong experience in Microsoft Azure , Power Platform , and Power BI to design, implement, and optimize CI/CD pipelines, cloud infrastructure, and data solutions. The ideal candidate will bridge development, operations, and business intelligence teams to deliver scalable, secure, and automated solutions across the Microsoft ecosystem. Requirements: 3+ years of experience with Azure DevOps and CI/CD pipeline implementation. Hands-on experience with Microsoft Azure services (App Services, Azure Functions, Storage, Key Vault, etc.). Strong experience with Power Platform (Power Apps, Power Automate, environment management). Experience deploying and managing Power BI solutions, including data modeling and workspace governance. Key Responsibilities: Design and maintain CI/CD...