This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Principal Full Stack Engineer based in the United States. The Principal Full Stack Engineer will shape the next generation of a customer relationship management platform serving the automotive repair industry. In this high-impact role, you will lead architectural decisions, build scalable software solutions, and drive complex products from concept to launch. You will focus on core platform capabilities, data ingestion, processing, and automation while ensuring performance, security, and maintainability. A central part of the role involves integrating large language models and designing AI-driven, autonomous workflows directly into engineering and production systems. Working closely with product leaders and fellow engineers, you will translate customer needs into technical innovations that deliver measurable business value. This opportunity offers substantial technical ownership, room to experiment with emerging technologies, and the chance to influence engineering practices within a fast-moving, AI-first environment. The position is fully remote within the United States and suited to an experienced engineer who thrives on accountability, innovation, and ambitious technical challenges.