Auth0's approach to developing internal tools is centered around enhancing customer success by automating processes and providing visibility into customer interactions. Led by Soledad Pano, the team has evolved from building essential tools during the company's startup phase to maintaining more complex systems as Auth0 has grown. Their stack includes technologies like NodeJS, MongoDB, and React, hosted on Heroku, while balancing internal tool development with customer-facing projects. Pano emphasizes the importance of security and compliance across all tools, although the team dedicates more resources to usability testing for customer-facing products. Decisions to build or buy tools are influenced by the company's stage and needs, with a preference for buying when scalability and specific requirements come into play. Success is measured through internal feedback loops and metrics that align with broader business goals, ensuring internal tools support both team efficiency and customer outcomes. Auth0, a remote-first company, is actively hiring across various functions.