Senior Multi-Tenant .NET Backend & Integration Engineer

Design, code, and optimize secure multi-tenant APIs using C# and .NET Core that dynamically query and aggregate data across Amazon DynamoDB, PostgreSQL, and varied external client data sources.
Provide clear architectural requirements to DevOps and Network Engineering teams regarding application infrastructure needs.
Collaborate with network and infrastructure peers to validate secure backend connections to external client data centers.
Diagnose, isolate, and debug end-to-end data routing issues between the AWS-hosted API and remote external databases.
Required Qualifications

Experience: 5+ years of active, hands-on backend development building distributed systems on AWS.

Technical Skills:
Expert-level C#, .NET Core
Deep hands-on experience with Amazon DynamoDB, PostgreSQL (Entity Framework Core or Dapper), and writing abstract data access layers to query heterogeneous external data sources.
Real-world experience implementing application-level tenant isolation, data partitioning, and tenant context middleware.
Solid conceptual understanding of VPCs, AWS PrivateLink, and firewalls to effectively guide networking peers.
Basic familiarity with cloud infrastructure deployment (Terraform, AWS CDK) to streamline pipeline integrations.