Client: Our client operates in the travel and hospitality industry and is building a high\-volume distribution and integration platform connecting downstream systems with multiple Hotel Property Management Systems (PMS) and hospitality platforms. The platform supports mission\-critical availability, rate, and inventory flows and is designed for scale, performance, and resiliency. * Project overview: The project focuses on high\-throughput, low\-latency distribution, handling complex hospitality concepts such as ARI (Availability, Rates, Inventory), restrictions, inventory blocks, and state reconciliation across event\-driven and polling\-based models. * The platform is built using Microsoft technologies (.NET and Azure), with strong emphasis on Azure infrastructure, DevOps, and relational data consistency. Position overview: As a Senior Backend Engineer you will design, build, and maintain core backend integrations between the client’s platform and Hotel PMS / CRS / hospitality systems. This role requires hands\-on experience integrating with at least one hospitality platform and strong domain knowledge of hotel distribution, combined with solid experience operating backend systems on Azure and SQL\-based architectures. * .NET / C\#; * Azure, including: Azure Virtual Machines, Azure App Gateway, Azure App Services / Functions, Azure Service Bus, Azure DevOps (pipelines, CI/CD); * SQL databases (Azure SQL, SQL Server); * REST APIs (JSON); * Event\-driven architectures; * OAuth2 authentication; * Docker; * Observability \& logging (Azure Monitor, Application Insights or similar). * Responsibilities: Design, build, and maintain backend integrations with Hotel PMS and hospitality platforms. * Implement idempotent ARI (Availability, Rates, Inventory) update mechanisms. * Handle complex hotel distribution concepts (rate plans, restrictions, inventory blocks). * Build and operate high\-volume, low\-latency distribution systems. * Reconcile system state across event\-driven and polling models. * Design resilient integration patterns (idempotency, retries, deduplication). * Ensure data integrity and performance in SQL databases. * Contribute to Azure deployments, CI/CD pipelines, and operational readiness. * Collaborate with product, QA, and partner technical teams on integration contracts. * Troubleshoot and resolve production issues with external hospitality systems. * Requirements: Integration experience with at least one hospitality platform (Hotel PMS or CRS). * Strong understanding of ARI (Availability, Rates, Inventory), rate plans, restrictions, and inventory allocation. * Experience with hospitality APIs and reconciling state across event\-driven and polling systems. * 5\+ years as Backend Engineer with system\-to\-system integrations. * Proficient in .NET/C\#, Azure (VMs, App Gateway, App Services, Service Bus), and Azure DevOps CI/CD. * Strong in REST APIs, event\-driven architectures, and SQL databases (schema design, performance). * Knowledge of idempotent API design, concurrency, retries/backoff strategies. * Experience with high\-throughput production systems and good English communication skills. * Nice to have: Direct experience integrating with one or more of the following platforms: * Oracle OPERA Cloud / OHIP * Amadeus Hospitality Suite * Sabre SynXis * Cloudbeds * Mews PMS * Infor HMS * Agilysys Stay * Shiji Daylight PMS * Experience with distributed tracing and observability * Familiarity with high\-availability, low\-latency architectures * Understanding of Agile / Scrum methodologies