Northrop Grumman, a leading defense and aerospace company, is seeking a Principal Software Engineer for their Sentinel program in Colorado Springs. This role combines full-stack development responsibilities with mission-critical systems work. The position requires expertise in both front-end and back-end development, with a focus on COTS evaluation and implementation. The ideal candidate will work independently on complex technical problems, developing solutions that require creativity and innovation. The role offers comprehensive benefits including healthcare, 401k, and educational assistance, plus a flexible 9/80 work schedule. With a salary range of $100,300 - $150,500, this position requires an active Secret clearance and strong technical skills in C/C++, operating systems, and RTOS. Join a pioneering company that has been at the forefront of technological advancements, from transatlantic flight to space exploration, where your work will impact critical defense systems and push the boundaries of possible across multiple domains.