The Principal Software Development Engineer in Test will design, develop, implement, document, and maintain test infrastructure with a high level of complexity that requires innovation and ingenuity. This role involves guiding the evolution of all test systems through innovation and technical leadership, modeling and acting in accordance with REI's guiding values and mission. The engineer will lead innovation for the group by exploring new technology, showing others how to leverage those discoveries through proof-of-concept implementations, and incorporating those into the platform where advised. Responsibilities include advocating for technical debt reduction and test technology migration, driving the definition and adherence to the test development culture, acting as a technical consultant for assigned teams, and ensuring code quality across all assigned projects. The role also includes mentoring other SDETs, participating in hiring activities, and carrying authority to make technical decisions when necessary. The position requires participation in a 24x7 on-call rotation and allows for telecommuting within normal commuting distance of Seattle, WA, with remote work considered within the U.S.