Contractor

Principal Software Engineer

Posted by Confidential • Bridgeton, Missouri, United States

📍 Bridgeton, Missouri 🕒 June 19, 2026

About the Role

Job Title: Principal Software Engineer

Job Description

This role focuses on working within complex, established software systems rather than greenfield development. You take ownership of challenging technical problems and drive them through to resolution, often involving integration and debugging as much as writing new code. You collaborate closely with multiple teams, influencing technical decisions and guiding direction instead of simply executing assigned tasks. The position emphasizes robust engineering practices, code quality, application security, and reliable system integration in demanding, mission-critical environments.

Responsibilities

  • Work extensively within existing, complex embedded and systems software, enhancing functionality, improving reliability, and addressing defects.
  • Take end-to-end ownership of technical problems, from initial investigation and root cause analysis through to implementation, testing, and depl...
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