70 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 click apply for full job details

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:...

Node.js Contractor - AI Tool Replatforming Remote | Outside IR35 | £450-500/day We are looking for an experienced Node.js contractor to help replatform and modernise an internally developed AI-driven data platform. The existing tool was rapidly developed by a member of the technical team using AI-assisted development tools and is currently running locally on a laptop environment. We now need an experienced engineer to rewrite/refactor the application into a secure, production-ready Node.js solution suitable for deployment within our server infrastructure. The Role You will take ownership of analysing the current Python-based application and rebuilding/refactoring it into a scalable and maintainable Node.js platform. The application: Pulls data from multiple external sources including: RSS feeds Websites APIs Processes and stores data within a database Includes a front-end interface for displaying and interacting with the data A key part of the engagement will...

A rapidly expanding, technology-focused organisation is seeking a contract Frontend Developer to join its software engineering function. This role offers an excellent opportunity to contribute to modern frontend applications within a smaller agile squad, collaborating closely with engineering and wider business teams in a fast-paced environment. The Role Develop and enhance key frontend business systems using Vue.js Collaborate with engineering teams on technical design and system improvements Support integration between internal platforms and applications Participate in Agile ceremonies including sprint planning, stand-ups, and retrospectives Contribute to technical decision-making and architecture discussions Perform code reviews and maintain high development standards What You'll Need Strong commercial experience with Vue.js Experience developing scalable frontend applications Solid understanding of Agile delivery methodologies Experience...

Backend Heavy Full Stack Developer (Node.js / Angular) Contract – 2 Years £450–£500 per day (Outside IR35) Fully Remote SC Clearance Required (Active) We’re currently supporting a long-term programme within the Ministry of Defence, seeking an experienced SC Cleared Full Stack Developer with a strong backend focus to join a high-impact digital delivery team. This is a fully remote role offering stability on a 2-year engagement, working within a modern engineering environment focused on scalable backend services, API architecture, and secure application development. Key Responsibilities: Lead the design, development, and optimisation of scalable backend services using Node.js Own API architecture, development, and integration across multiple systems Build and maintain robust, secure microservices and server-side logic Collaborate with frontend engineers (Angular) to deliver end-to-end solutions Work closely with cross-functional Agile teams to...

Senior NetSuite Developer £500 - £550 per day (Outside IR35) This freelance opportunity offers the chance to lead complex NetSuite transformation programmes across multi-entity, international environments. You will take ownership of end-to-end solution design and delivery, working closely with senior stakeholders to shape scalable NetSuite architectures that support long-term business transformation. The Company They are a global organisation operating across multiple regions and business units, undergoing significant systems and process transformation. NetSuite sits at the centre of their finance and operational landscape, supporting growth, optimisation, and integration across the wider technology estate. The environment is complex, fast-moving, and collaborative, with a strong focus on long-term platform value. The Role and Deliverables Lead end-to-end NetSuite solution architecture and delivery across multi-entity and multi-country implementations. Run discovery...

Node.js Contractor - AI Tool Replatforming Remote | Outside IR35 | £450-500/day We are looking for an experienced Node.js contractor to help replatform and modernise an internally developed AI-driven data platform. The existing tool was rapidly developed by a member of the technical team using AI-assisted development tools and is currently running locally on a laptop environment. We now need an experienced engineer to rewrite/refactor the application into a secure, production-ready Node.js solution suitable for deployment within our server infrastructure. The Role You will take ownership of analysing the current Python-based application and rebuilding/refactoring it into a scalable and maintainable Node.js platform. The application: Pulls data from multiple external sources including: RSS feeds Websites APIs Processes and stores data within a database Includes a Front End interface for displaying and interacting with the data A key part of the engagement will...

Frontend Vue.js Developer Location: UK Remote (UK-based candidates only) Contract: Rolling 3-Month Contract Rate: £250-£300 per day IR35 Status: Outside IR35 Please note: Sponsorship is not available for this role. Overview A growing technology-led organisation is looking for a Frontend Vue.js Developer to join its software engineering function on a contract basis. You'll work within a smaller agile squad responsible for developing, enhancing, and maintaining key business systems and integrations. This is an excellent opportunity to contribute to modern frontend applications while collaborating closely with engineering and wider business teams in a fast-paced environment. The Role You will play a key role in the development and enhancement of business-critical systems, contributing to both technical delivery and engineering best practices. Working closely with senior engineers and cross-functional stakeholders, you'll help design and build scalable frontend...

Frontend Vue.js Developer Location: UK Remote (UK-based candidates only) Contract: Rolling 3-Month Contract Rate: £250-£300 per day IR35 Status: Outside IR35 Please note: Sponsorship is not available for this role. Overview A growing technology-led organisation is looking for a Frontend Vue.js Developer to join its software engineering function on a contract basis. You’ll work within a smaller agile squad responsible for developing, enhancing, and maintaining key business systems and integrations. This is an excellent opportunity to contribute to modern frontend applications while collaborating closely with engineering and wider business teams in a fast-paced environment. The Role You will play a key role in the development and enhancement of business-critical systems, contributing to both technical delivery and engineering best practices. Working closely with senior engineers and cross-functional stakeholders, you’ll help design and build scalable...

Frontend Vue.js Developer Location: UK Remote (UK-based candidates only) Contract: Rolling 3-Month Contract Rate: £250-£300 per day IR35 Status: Outside IR35 Please note: Sponsorship is not available for this role. Overview A growing technology-led organisation is looking for a Frontend Vue.js Developer to join its software engineering function on a contract basis. You'll work within a smaller agile squad responsible for developing, enhancing, and maintaining key business systems and integrations. This is an excellent opportunity to contribute to modern frontend applications while collaborating closely with engineering and wider business teams in a fast-paced environment. The Role You will play a key role in the development and enhancement of business-critical systems, contributing to both technical delivery and engineering best practices. Working closely with senior engineers and cross-functional stakeholders, you'll help design and build scalable frontend...

About The Company Pixelcode Technologies Limited is a leading technology solutions provider specializing in delivering innovative software applications and services to clients across various sectors. With a strong focus on security, scalability, and performance, Pixelcode Technologies Limited has established a reputation for excellence in developing enterprise-grade solutions tailored to meet complex business needs. The company prides itself on fostering a collaborative and dynamic work environment, encouraging continuous learning and professional growth among its team members. Committed to leveraging the latest technological advancements, Pixelcode Technologies Limited aims to drive digital transformation and deliver value-driven outcomes for its clients. About The Role We are urgently seeking a highly skilled SC Cleared Java Developer to join our team on a contract basis (Outside IR35). This role is pivotal in designing, developing, and maintaining large-scale, secure...

CAFM Developer 4 Month Contract - Outside IR35 £80 p/h 100% remote Working Our client mobilise, maintain and develop ‘integrator’ platforms to enable our public sector (mainly central government) clients to manage large and complex estate portfolios required to deliver (often critical) services to the public. Central to GS EMEA’s current technical platform is Concept Evolution, which is deployed across five client platforms managing large volumes of transactional data, integrated to multiple supplier systems, and using complex automated business rules developed by our specialised in-house CAFM team to ensure data integrity and transactional fidelity. The role is responsible to the Sr CAFM Development Lead for: Developing technical specifications to deliver the requirements, or updating existing specifications where they exist Leading the development of technical solutions, using Workflow Pro for business rule automation, understanding of database...

We are urgently looking for an SC Cleared Java Developer on the contract basis (Outside IR35 ). The developer should have hands-on experience delivering large-scale Java and Spring-based solutions within secure public sector environments. You will be responsible for designing, developing, and supporting enterprise-scale applications, troubleshooting live systems, and delivering scalable micro services solutions within mission-critical environments. This role requires expertise in modern Java technologies, cloud platforms, distributed systems, CI/CD practices, and Agile delivery methodologies. Key Skills: •  Having atleast 7+ years, hands-on experience in Java 17+, Spring Boot, Spring Data JPA, Spring Integration, and Spring Batch. • Design and implement scalable microservices and distributed systems architectures. • Support live production systems, diagnose incidents, and perform root cause analysis. • Build integrations using RESTful and...

We are urgently looking for an SC Cleared Java Developer(Midlands) on a contract basis ( Outside IR35 ). The ideal candidate should have hands-on experience delivering large-scale Java and Spring-based solutions within secure public sector environments. You will be responsible for designing, developing, and supporting enterprise-scale applications, troubleshooting live systems, and delivering scalable microservices solutions within mission-critical environments. This role requires expertise in modern Java technologies, cloud platforms, distributed systems, CI/CD practices, and Agile delivery methodologies. The role is hybrid requiring 2 days per week in office. Key Skills: Minimum 7+ years of hands-on experience in Java development Strong expertise in Java 17+, Spring Boot, Spring Data JPA, Spring Integration, and Spring Batch Experience designing and implementing scalable microservices and distributed systems Strong experience supporting live production...

About the Role: We are seeking a highly skilled Java Developer to join our team and work on a large-scale public sector program. This unique development opportunity involves creating and implementing solutions for our portfolio of biometric products, supporting live systems, and diagnosing incidents. You will be part of a collaborative team that prides itself on engineering the best possible Java code. Key Responsibilities: Develop and implement solutions for biometric products. Support live systems and diagnose incidents. Collaborate with the team to ensure high-quality Java code. Essential Skills and Experience: Proficiency in Java 17+, Spring Boot, Spring Data JPA, Spring Integration, Spring Batch, Microservices, Quartz, SQL Database (PostgreSQL), JPA (Hibernate), REST and SOAP Web Services, Messaging service (ActiveMQ), Maven, Junit, Jenkins, AWS Cloud hosting and its components, Postgres/Aurora, Bootstrap, Docker, TDD, Agile (Scrum) Public...

KDB Developer - Outside IR35 Contract London, UK - Hybrid Working Up to £800 per day Long-Term Engagement on a Rolling Contract May Start Date Our client, a leader in the FinTech space are searching for a KDB Developer to add to their Client Engineering team! You'll be working alongside Software teams to develop, test and maintain all code for client applications. Responsibilities will include : Gather and translate business requirements into technical solutions for market data and analytics applications Design, develop, test and maintain kdb+ applications and supporting services Support full project delivery lifecycle, including debugging, optimisation and production support Perform data analysis and build reporting/analytics outputs for stakeholders Mentor junior developers and contribute to code quality, standards and team delivery Technical Skills needed : Hands-on experience with kdb+ and strong proficiency in q for time-series data...

Frontend Developer Remote with very occasional client visits £400pd - Outside IR35 6 - 8 month contract Primarily Remote - occasional on-site presence at Lisburn (paid for) Our client, an established and successful Technology company are looking for an experienced Frontend Developer to join them on a contract basis They are an industry leading Smart technology company with clients around the globe such as Claridges, Nobu and Belgravia You will be working on a critical-infrastructure platform being developed at Belfast Hospital, currently in a UK Government commercial and financial audit. The work is React component build against a published 1,300-line developer build specification, with an established design system, audit-log integration requirement, and live data feeds We are looking for: Expert knowledge of React and TypeScript Comfort working alongside AI-assisted development tools. The internal team works with AI tooling in daily development; you must...