Our client is a leading U.S. healthtech company that is transforming how people access and experience medical care. Their platform serves millions of patients across thousands of cities and powers tens of millions of appointments each year. The engineering organization values strong technical standards, transparency, and collaboration, working on mission-critical systems that impact healthcare delivery nationwide. You'll join the Messaging Team, responsible for developing scalable, high-performance communication solutions that support appointment confirmations, reminders, and engagement campaigns. The team leverages cloud-native architectures, .NET Core, and AWS to deliver secure, reliable, and time-sensitive messages to patients and healthcare providers. Current priorities include enhancing Braze integration, improving operational excellence, and preparing for a potential migration to a new communication platform. We are seeking a Senior .NET Developer to design, develop, and maintain cloud-native applications within the Messaging Team. This role combines solid backend development skills with experience in communication workflows, DevOps automation, and API-based integrations. You'll collaborate closely with engineering, product, and marketing teams to ensure high-quality, timely messaging delivery across multiple channels. A minimum 3-hour overlap with Eastern Standard Time (EST) is required for effective collaboration.