Fulfilling the promise of tailor-made dog nutrition requires solving scalability challenges in all areas of the systems of tails.com. They can’t always rely on caching because no two requests are the same. This talk goes into details of how tails.com tailors prices for customers at scale using Python 3, touching on their micro-service architecture, Kubernetes-based infrastructure and scaling strategy, to handle peak TV ad slots while providing unique pricing for every single customer.