We are looking for an experienced .NET Integration Engineer to support the delivery of a large-scale enterprise systems integration programme for a leading facilities management client. The programme spans approximately 34 back-office applications across finance, HR, procurement, operations, fleet, and customer management, and requires a modern event-driven integration architecture built on Azure Service Bus, Azure Functions, and Azure Microservices.
The ideal candidate has deep hands-on experience building production-grade .NET integrations in Azure, a strong grasp of pub/sub and event-driven patterns, and the ability to work collaboratively across multiple system owners, data stewards, and a live PMO structure. You will contribute across the full integration lifecycle (from detailed design through build, testing, deployment, and hypercare) across seven domain waves covering HR, Commercial, Procurement, Operations, Shared Services, QHSE, and Finance.
Responsibilities
Integration Design & Build
Design and build event-driven integrations within a centralised Azure Integration Hub using Azure Service Bus, Azure Functions, and Azure Microservices, following push/pull and real-time delivery patterns
Develop and maintain system adapters for enterprise applications across HR, ERP, CRM, procurement, CAFM, field service, fleet, and QHSE domains, each mapping to a dedicated microservice aligned to the client's event catalogue
Produce build-ready Integration Design Documents (IDDs) covering field-level mappings, transformation logic, error handling, retry and idempotency patterns, and monitoring design, with formal approval required before development begins
Refactor legacy point-to-point integrations into the centralised hub architecture, ensuring all code is production-grade, documented, and transferred to client ownership at handover
Testing & Deployment
Integration testing (with QA Engineer) across unit, SIT, and UAT phases including test script preparation, execution coordination, defect triage, and reporting in Azure DevOps
Wave-level deployment activities including cutover planning, runbook preparation, environment validation, and post-deployment sign-off
Participate in hypercare support per wave, covering performance monitoring, break/fix resolution, and knowledge transfer to the client team prior to handover
Collaboration & Governance
Work closely with solution architects, data engineers, QA, and system owners to validate designs, agree field-level mappings, and ensure integrations align with the broader MDM and data platform architecture
Participate in sprint ceremonies and contribute to the RAID log, CI/CD pipeline configuration, and project reporting within the client PMO structure
6+ years of experience in .NET software or integration engineering, with demonstrable delivery of production Azure integrations
Strong hands-on experience with Azure Service Bus, including topic/subscription configuration, dead-letter handling, and publish/subscribe patterns
Proficiency in C# and .NET for building Azure Functions and Azure Microservices used as integration adapters
Experience designing and implementing event-driven integration architectures, including real-time and scheduled/pull-based patterns
Solid understanding of REST APIs, SOAP/XML, JSON, and field-level data mapping for enterprise application integrations
Experience with Azure DevOps (ADO) for source control, CI/CD pipelines, test management, and defect tracking
Familiarity with enterprise application landscapes spanning ERP, HRIS, CRM, CAFM, and procurement platforms, and an understanding of how data flows between them
Experience producing Integration Design Documents or equivalent technical specifications to build-ready standard
Understanding of error handling strategies, retry policies, idempotency patterns, and integration monitoring in distributed systems
Strong communication skills and ability to engage confidently with both technical architects and business system owners
Experience with Azure Event Grid for real-time, low-latency event delivery in addition to Azure Service Bus
Hands-on experience with Azure Key Vault for secure credential and connection string management in integration solutions
Familiarity with enterprise MDM platforms and understanding of master data propagation patterns across multi-system estates
Exposure to cloud data platforms and pipeline orchestration tools in the context of integration development
Experience with automated data quality frameworks for testing across ingestion and transformation layers
Background in facilities management, field services, or similarly complex multi-system enterprise environments
Experience working within a formal delivery programme (agile/sprint-based) with structured test management and phased go-live deployments
Experience contributing to operational handover, knowledge transfer, and runbook documentation for client teams
