Principal Engineer, Card Readers Team

Toast creates technology to help restaurants and local businesses succeed in a digital world, helping business owners operate, increase sales, engage customers, and keep employees happy. As a Principal Engineer on the Card Readers team, you will be a technical leader responsible for designing, developing, and maintaining our POS payment integrations. You will work closely with hardware SDKs, the core POS application team, and other cross-functional stakeholders to drive technical decisions and define the target architecture for our payment solutions. Your expertise in high-throughput asynchronous JVM solutions, coupled with a deep understanding of mission-critical transactional processing, will be crucial in delivering robust and scalable solutions. A day in the life (Responsibilities) Develop and execute technical strategies to solve complex business challenges, leveraging data and customer insights to prioritize impactful improvements. Establish guiding technical and delivery principles that influence engineering practices across the broader engineering organization. Architect, design, and develop robust, high-performance applications using Kotlin, optimized for security, speed, availability, and reliability. Raise the bar as a high-throughput, hands-on code contributor modeling high standards. Lead agile development processes, including sprint planning, daily stand-ups, and retrospectives. Mentor and guide engineers, fostering a culture of continuous improvement, inclusivi