Principal Software Engineer - 11686

Coupa is seeking a Principal Software Engineer to lead the architectural evolution of the Coupa Supplier Platform (CSP), a Rails monolith serving millions of suppliers. The role involves defining microservice boundaries, API design, deployment pipelines, mentoring engineers, and partnering with SRE on cloud-native infrastructure. The engineer will work with Ruby on Rails, Golang, Java, and introduce new technologies as needed. This is a remote position based in San Francisco.

15+ years building B2B SaaS at scale with leadership roles. Experience evolving legacy systems into microservices in production. Deep knowledge of API-driven services, multi-tenant architectures, B2B integration patterns. Solid foundation in CI/CD, Docker/Kubernetes, infrastructure-as-code, cloud providers (AWS/GCP). Comfort across Rails, Golang, Java. Track record mentoring teams. Problem-solving balancing scale, performance, technical debt. Communication skills across engineering, product, and