Principal Software Engineer responsible for architecting and leading development of scalable, reliable backend platforms. The role sets technical direction, leads cross-functional engineering initiatives, promotes architectural and operational excellence, resolves incidents, and mentors engineers. Requirements include 10+ years of technical leadership experience, deep expertise in distributed backend systems and scalable architectures, Ruby on Rails experience, strong communication and influence, agile development experience, and familiarity with front-end architecture or full-stack systems.