48 systems integration developer jobs found

Systems Integration Developer (XML / SQL / VB.NET) Outside IR35 | Day Rate | Fully Remote | Immediate Start Seeking a hands‑on Systems Integration Developer to integrate externally produced data back into live systems, ensuring it behaves as native system output. Strong focus on XML, SQL, and VB.NET , with light ETL-style data handling. Key Skills XML (structured outputs, schemas, validation) XSLT transformations VB.NET system posting / integration logic SQL (data loads, reconciliation, fixes) Experience integrating external data into existing platforms Role Highlights Design and load XML aligned to existing system formats Build XSLT for system and user-facing views Develop VB.NET logic to validate and post data Use SQL to support data movement and integrity Ensure existing workflows and outputs continue uninterrupted Repeatable delivery across multiple data loads Contract: Outside IR35 Location: Fully Remote Start: Immediate / short notice...

Systems Integration Developer (XML / SQL / VB.NET) Outside IR35 Day Rate Fully Remote Immediate Start Seeking a hands-on Systems Integration Developer to integrate externally produced data back into live systems, ensuring it behaves as native system output. Strong focus on XML, SQL, and VB.NET , with light ETL-style data handling. Key Skills XML (structured outputs, schemas, validation) XSLT transformations VB.NET system posting / integration logic SQL (data loads, reconciliation, fixes) Experience integrating external data into existing platforms Role Highlights Design and load XML aligned to existing system formats Build XSLT for system and user-facing views Develop VB.NET logic to validate and post data Use SQL to support data movement and integrity Ensure existing workflows and outputs continue uninterrupted Repeatable delivery across multiple data loads Contract: Outside IR35 Location: Fully Remote Start: Immediate / short notice

Systems Integration Developer (XML/SQL/VB.NET) Outside IR35 | Day Rate | Fully Remote | Immediate Start Seeking a hands-on Systems Integration Developer to integrate externally produced data back into live systems, ensuring it behaves as native system output. Strong focus on XML, SQL, and VB.NET , with light ETL-style data handling. Key Skills XML (structured outputs, schemas, validation) XSLT transformations VB.NET system posting/integration logic SQL (data loads, reconciliation, fixes) Experience integrating external data into existing platforms Role Highlights Design and load XML aligned to existing system formats Build XSLT for system and user-facing views Develop VB.NET logic to validate and post data Use SQL to support data movement and integrity Ensure existing workflows and outputs continue uninterrupted Repeatable delivery across multiple data loads Contract: Outside IR35 Location: Fully Remote Start: Immediate/short notice

Systems Integration Developer (XML / SQL / VB.NET) Outside IR35 | Day Rate | Fully Remote | Immediate Start Seeking a hands-on Systems Integration Developer to integrate externally produced data back into live systems, ensuring it behaves as native system output. Strong focus on XML, SQL, and VB.NET , with light ETL-style data handling. Key Skills XML (structured outputs, schemas, validation) XSLT transformations VB.NET system posting / integration logic SQL (data loads, reconciliation, fixes) Experience integrating external data into existing platforms Role Highlights Design and load XML aligned to existing system formats Build XSLT for system and user-facing views Develop VB.NET logic to validate and post data Use SQL to support data movement and integrity Ensure existing workflows and outputs continue uninterrupted Repeatable delivery across multiple data loads Contract: Outside IR35 Location:...

Senior Software Engineer (Contract) 3-Month Engagement | Outside IR35 | Up to £475 per day | Hybrid (London / Ipswich) A rapidly expanding SaaS company is seeking an experienced Senior Software Engineer to support their agile delivery team on an initial 3-month contract. This position offers a strong mix of hands-on development and strategic input, with the opportunity to shape system architecture, influence engineering practices, and contribute directly to product evolution. You'll play a key role in designing, building, and improving scalable cloud-native applications, while also guiding team members and promoting high standards across the development lifecycle. Core expertise required: Advanced experience with C# and .NET (Framework and Core) Frontend development using TypeScript, HTML, CSS, and either React or Vue Proven track record with AWS, ideally including serverless architectures (e.g., Lambda) Experience with CI/CD pipelines and Infrastructure as Code...

Role: Data and AI Tech Lead Role Type: Outside IR35 Contract Rate: Negotiable Location: London, UK - Hybrid (Hybrid 1 or 2 Days Onsite a week) Note: No of positions 1. Role Overview: We are seeking a Data & AI Technical Lead to drive the Discovery & Design phase of a large-scale M&A program for a Retail & CPG client. This role will lead the technical direction across a complex, multi-cloud data landscape spanning Azure, AWS, GCP, Databricks, and Snowflake. You will oversee and guide senior Data Architects, ensuring architectural alignment, technical quality, and business relevance. The role sits at the intersection of business strategy, data architecture, and platform engineering, acting as a key liaison between client stakeholders, IT teams, and the Chief Data Office. This is a high-impact leadership role requiring both hands-on architectural depth and stakeholder influence at senior levels. Key Responsibilities: 1. Technical...

Shopify App Developer Location: Remote in UK Duration: ~3 months (Project-Based Contract - potential for renewal) Rate: £450 - £550 per day Outside IR35 Overview We're looking for an experienced Shopify App Developer to support a 3-month project focused on expanding an existing Shopify app used by publishers to sell publications via their storefronts. The app is already in production, and the goal is to enhance functionality, extend integrations, and improve fulfilment workflows. This role requires someone who can quickly get up to speed with an existing codebase and deliver high-quality improvements with minimal ramp-up time. Key Responsibilities Enhance and extend an existing Shopify app Build new features using Shopify GraphQL APIs Implement and optimise Shopify Fulfilment API integrations (critical) Develop Back End services in Java (Spring Boot) Ensure stable and scalable integration between Shopify and internal systems Debug and resolve...

React Developer Remote with very occasional client visits £400pd to £420pd - Outside IR35 3 month contract - potential for extension Our client, an established and successful Consultancy are looking for a number of mid-level Developers to join them on a contract basis With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders After recently winning a large public sector project they are creating a whole new team and need people who are able to start no later than March 16th. This is a fully hands on role where you will work as part of an established successful team, primarily working with React and Typescript technologies We are looking for: Expert knowledge of React Strong proficiency in JavaScript (ES6+), HTML5, CSS3, and responsive UI engineering. Experience with Redux or other state management libraries. Strong...

React Developer Remote with very occasional client visits £400pd to £420pd - Outside IR35 3 month contract - potential for extension Our client, an established and successful Consultancy are looking for a number of mid-level Developers to join them on a contract basis With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders After recently winning a large public sector project they are creating a whole new team and need people who are able to start no later than March 16th. This is a fully hands on role where you will work as part of an established successful team, primarily working with React and Typescript technologies We are looking for: Expert knowledge of React Strong proficiency in JavaScript (ES6+), HTML5, CSS3, and responsive UI engineering. Experience with Redux or other state management libraries. Strong...

Are you a talented Web Developer with a passion for building seamless digital experiences? Our client, a leading travel company, is seeking a skilled developer with strong expertise in React front-end development and Umbraco CMS to join their team for 3-6 months. This is an excellent opportunity to work on high-profile projects, delivering modern, scalable, and user-focused web solutions. The Role As a Web Developer, you'll be responsible for: Developing responsive, high-performance web applications using React Building and maintaining websites within the Umbraco CMS Collaborating closely with designers, back-end developers, and stakeholders Writing clean, maintainable, and well-documented code Optimising applications for speed, scalability, and SEO best practices Required Skills & Experience Proven commercial experience with React js Strong knowledge of JavaScript (ES6+) , HTML5, and CSS3 Hands-on...

Senior Integration Analyst & Developer (Oracle) Fully Remote 6-month rolling contract £600 per day Outside IR35 We are seeking a Senior Integration Analyst & Developer with strong Oracle Fusion Cloud experience to support a major integration programme across Finance and Project Accounting systems. The role involves designing, building, and supporting integrations using Oracle Integration Cloud (OIC), along with developing transformation logic using SQL, PL/SQL, XML, JSON, XSLT, and related technologies. You will also build and enhance BIP reports and data models, develop VBCS applications, and support Fusion ERP integration touchpoints. Key responsibilities include delivering end-to-end integrations in OIC, troubleshooting and resolving integration issues, supporting SIT and UAT cycles, and working closely with implementation partners to review technical designs and ensure high-quality delivery. Required experience includes 6+ years in Oracle...

For this vacancy, we require senior .Net Engineers with experience working on AWS, and building advanced agentic workflows. Competitive day rates, outside IR35, fully remote. Reapit – Who are we? Reapit is the original end-to-end business technology provider for estate agencies of all sizes. We’ve been helping sales and lettings agents build relationships and grow their businesses for more than 25 years. Our technology empowers property professionals across Europe, the Middle East, Australia, and New Zealand to work with buyers, sellers, tenants, and landlords to deliver a dream home experience. Worldwide, over 100,000 agents across more than 15,000 branches use Reapit to run their businesses, manage properties, collect rent, engage clients, and provide outstanding customer service every time. What you’ll be doing Reporting to the Director of Engineering, you’ll operate as a highly senior, technically hands-on backend engineer, embedded into a squad and owning...

We're Hiring: PHP Developer (Hybrid Newcastle) Contract / Day Rate / Outside IR35 Opportunity to work with some great people, that are shipping awesome B2B SaaS based products. Are you a skilled PHP Developer ready to take the next step in your career? Join a fast-moving product & tech team where your code actually makes a difference. We're looking for a motivated, proactive developer who’s passionate about building modern, scalable web applications. What You’ll Be Doing: Writing clean, efficient PHP (8.x) code across a modern full-stack environment Building and maintaining tools, features, and products from the ground up Collaborating with team members, product owners, and stakeholders Debugging, testing (unit, integration, e2e), and reviewing peer code Improving documentation, architecture, and dev processes Tech Stack: Frontend: Vue. HTML, CSS, JavaScript Backend: PHP 8.x (OOP, Composer), Redis, MySQL Tools: Docker, Git, Linux,...

MuleSoft Developer You'll play a key role in designing, building, and deploying scalable integration solutions using MuleSoft, including Mule 3 and Mule 4 on the Anypoint Platform. You'll help modernise critical systems that impact millions of users. Key Responsibilities: * Develop and maintain APIs and integrations using MuleSoft (Mule 3 / Mule 4) * Work with Anypoint Studio, API Manager, and CloudHub * Collaborate with architects and stakeholders to deliver robust solutions Requirements: * Strong experience with MuleSoft (Mule 3 and/or Mule 4) * Solid understanding of RESTful APIs and integration patterns * Public sector experience (desirable) Contract Details: * Remote (UK-based) * Competitive daily rate (outside IR35) * Immediate start

MuleSoft Developer You'll play a key role in designing, building, and deploying scalable integration solutions using MuleSoft, including Mule 3 and Mule 4 on the Anypoint Platform. You'll help modernise critical systems that impact millions of users. Key Responsibilities: * Develop and maintain APIs and integrations using MuleSoft (Mule 3/Mule 4) * Work with Anypoint Studio, API Manager, and CloudHub * Collaborate with architects and stakeholders to deliver robust solutions Requirements: * Strong experience with MuleSoft (Mule 3 and/or Mule 4) * Solid understanding of RESTful APIs and integration patterns * Public sector experience (desirable) Contract Details: * Remote (UK-based) * Competitive daily rate (outside IR35) * Immediate start

Opening: Join the Mission We deliver secure, mission‑critical platforms and services for government and regulated organisation’s operating in high‑assurance environments. Our teams work at the intersection of cloud engineering, DevSecOps, and platform enablement, helping organisation’s adopt Google Distributed Cloud (air‑gapped GCP). This role offers the opportunity to shape automation‑first testing strategies for new cloud‑native platforms, influence tooling and quality standards, and ensure solutions are secure, resilient, compliant, and testable by design. Role Purpose As an Automation Test Engineer, you will be responsible for designing, building, and operating automated testing capabilities across platform and application delivery teams. You will: Define and implement test automation strategies aligned to IaC, CI/CD, and DevSecOps practices Select, evaluate, and trade‑off test tooling suitable for air‑gapped Google Distributed Cloud environments Build and...

Senior Technical Lead Developer - Microsoft Dynamics 365 CE Contract | 6 Months | Outside IR35 | Competitive Day Rate | Hybrid We are recruiting a Senior Technical Lead Developer with strong Microsoft Dynamics 365 CE / CRM experience for an initial 6?month contract. This is a hands?on technical leadership role, ideal for a senior developer who enjoys owning technical delivery while providing light?touch line management, mentoring and coaching . The role does not involve heavy people management but does require clear technical authority. Responsibilities Lead the technical design and delivery of Dynamics 365 CE solutions Build and customise Dynamics using plugins, workflows and integrations Act as technical escalation point across the development team Provide mentoring and coaching to developers Translate business requirements into scalable, secure technical solutions Contribute to architectural decisions while remaining hands?on Essential Skills...

Lead C# Engineer - Agentic Workflows & Native AI Engineering, .Net 8/9, AWS (Lambda, SQS) – OUTSIDE IR35 Reporting to the Director of Engineering, this is a genuinely outstanding contract opportunity for a rockstar Senior C# Engineer to lead the development of a greenfield SaaS product . We’re looking for a ‘best of breed’, deeply senior, technically hands-on engineer who thrives in complex problem spaces and fast-moving start-up & scale-up environments. You’ll need a genuinely Product Centric mindset and approach twinned with experience of AI-Native Engineering and Agentic Workflow . Skills We’re Looking For: Senior–Staff-level backend engineer with deep, current expertise in C# and .NET Core 8/9 , capable of architecting and leading the design of distributed REST API microservices at scale. Authority in AWS serverless architecture; Lambda-first, with strong working knowledge of API Gateway, SQS, Step Functions, EventBridge and IAM, and...

Senior Technical Lead Developer - Microsoft Dynamics 365 CE Contract | 6 months | Outside IR35 | Competitive Day Rate | Hybrid We are recruiting a Senior Technical Lead Developer with strong Microsoft Dynamics 365 CE/CRM experience for an initial 6?month contract. This is a hands?on technical leadership role, ideal for a senior developer who enjoys owning technical delivery while providing light?touch line management, mentoring and coaching . The role does not involve heavy people management but does require clear technical authority. Responsibilities Lead the technical design and delivery of Dynamics 365 CE solutions Build and customise Dynamics using plugins, workflows and integrations Act as technical escalation point across the development team Provide mentoring and coaching to developers Translate business requirements into scalable, secure technical solutions Contribute to architectural decisions while remaining hands?on Essential Skills &...

Lead C# Engineer - Agentic Workflows & Native AI Engineering, .NET 8/9, AWS (Lambda, SQS) - OUTSIDE IR35 Reporting to the Director of Engineering, this is a genuinely outstanding contract opportunity for a rockstar Senior C# Engineer to lead the development of a greenfield SaaS product . We're looking for a best of breed', deeply senior, technically hands-on engineer who thrives in complex problem spaces and fast-moving start-up & scale-up environments. You'll need a genuinely Product Centric mindset and approach twinned with experience of AI-Native Engineering and Agentic Workflow . Skills We're Looking For: Senior-Staff-level Back End engineer with deep, current expertise in C# and .NET Core 8/9 , capable of architecting and leading the design of distributed REST API microservices at scale. Authority in AWS serverless architecture; Lambda-first, with strong working knowledge of API Gateway, SQS, Step Functions, EventBridge and IAM, and a track...