Senior Integration Engineer - Leeds - £395p/d Inside IR35

Senior Integration Software Engineer Contract

Location: Leeds / Wakefield hybrid, with at least 1 day per week onsite and occasional regional travel Rate: £395 per day Inside IR35 Contract: 1 September 2026 to 16 November 2026 Hours: Full-time

We are looking for a Senior Integration Software Engineer to support a large-scale integration programme, designing and delivering secure, reliable integrations across complex enterprise systems.

The Role You will work within a multidisciplinary delivery team alongside Architects, Business Analysts, Delivery Managers and technical stakeholders. Responsibilities will include:

• Developing secure APIs, integration services and reusable integration components

• Building interfaces using FHIR, HL7 v2.x and RESTful APIs

• Integrating with complex enterprise platforms, including EPR and PAS systems

• Supporting integration testing, deployment, go-live and early-life support

• Troubleshooting integration issues across multiple systems

• Developing automated unit, integration and API tests

• Working within Agile delivery and CI/CD environments

• Producing technical, API and interface documentation

• Supporting code reviews and maintaining high software engineering standards Essential Experience

• Strong enterprise software engineering and systems integration background

• Commercial experience with FHIR

• Commercial experience with HL7 v2.x

• Strong RESTful API and web services development experience

• Experience integrating multiple complex systems

• Cloud-based application development

• Git, CI/CD pipelines and automated testing

• Secure software development practices

• Agile and DevOps delivery experience

• Strong technical troubleshooting skills Experience with integration engines, middleware and event-driven architecture would also be beneficial.

Candidates must be comfortable attending the Leeds/Wakefield location at least once per week, with some additional regional travel for technical workshops, testing and implementation activities.