Description Principal Engineers provide technical leadership at Amazon.com. They help establish technical standards and drive Amazon’s overall technical architecture, engineering practices, and engineering methodologies. They work on our hardest problems, building high quality, architecturally sound systems that are aligned with our business needs. They think globally when building systems, ensuring Amazon.com builds high performing, scalable systems that fit well together. Principal Engineers are pragmatic visionaries who can translate business needs into workable technology solutions. Their expertise is deep and broad. They are hands on, producing both detailed technical work and high-level architectural designs. We are open to hiring candidates to work out of one of the following locations: Barcelona, ESP | Madrid, ESP Basic Qualifications - Knowledge of object-oriented design, data structures, and algorithms - Experience (non-internship) in professional software development Preferred Qualifications - Experience designing and building large-scale systems in a multi-tiered, distributed environment (Service Oriented Architecture) Amazon is an equal opportunities employer. We believe passionately that employing a diverse workforce is central to our success. We make recruiting decisions based on your experience and skills. We value your passion to discover, invent, simplify and build. Protecting your privacy and the security of your data is a longstanding top priority for Amazon. Please consult our Privacy Notice (https://www.amazon.jobs/en/privacy\_page) to know more about how we collect, use and transfer the personal data of our candidates.