Senior Backend Engineer: Secure APIs for National Security

Millennial Software seeks a Senior Backend Software Developer to join our team supporting National Security. You'll design, develop, and maintain scalable APIs and services, focusing on backend architecture, data modeling, integrations, performance, and reliability. You'll partner with frontend engineers, analysts, and users to deliver secure, high-quality tools for mission environments. The role emphasizes end-to-end lifecycle responsibilities from design to sustainment, with a strong emphasis