Senior .NET Backend Engineer — Remote & Scalable Systems

SalesBlue is seeking a senior .NET/C# engineer who has operated real production systems under load. You will design architecture for resilience and scale, maintaining a highly integrated backend that talks to telephony, AI platforms, carriers and CRMs.

You will shape backend architecture with the CTO, manage multi-server deployments and async pipelines, and collaborate with frontend integration via Next.js. Fluency in English is required; Spanish is a plus.