Role / Job Title: BizTalk Developer Work Location: Crawley, UK Office Attendance (Hybrid): 3 days in office The Role We are seeking an experienced BizTalk Developer to support a major upgrade project for one of the UK's leading airline customers. The current environment runs on BizTalk Server 2013 R2, and we are planning to migrate to BizTalk Server 2020 hosted on Azure IaaS. Your Responsibilities Functional Responsibilities Lead and support migration of BizTalk Server 2013 R2 to BizTalk Server 2020 on Azure IaaS virtual machines. Assess current integration solutions, identify dependencies, and develop migration plans. Prepare detailed migration documentation, design documents, and runbooks. Support environment provisioning, configuration, and testing in Azure IaaS. Validate migrated artifacts - schemas, maps, orchestrations, pipelines, and adapters - ensuring they function correctly post-upgrade. Conduct unit, integration, system, and UAT testing with stakeholders. Provide production cut-over support and post-migration stabilization. Technical Responsibilities Perform artifact migration including orchestrations, maps, schemas, pipelines, bindings, and custom compone...