Facebook, PayPal, Shopee, Airbnb, Grab, NocNoc - these seemingly disparate companies have disrupted entire industries by harnessing a single phenomenon: the platform business model. Multisided platforms function very differently from traditional businesses. They match and empower producers and consumers by using technology, and rather than creating value directly, orchestrate interactions between users. The success of platform companies has revealed the importance to design their core interactions carefully. Design is no longer a nice-to-have aspect, and should not be an after-thought. careful design considerations will determine whether the platform will be able to engage users, frequently enough, and whether it will scale.