What works at first, may not scale later. Undertaking a massive product architectural change is not an easy feat - it’s like changing wheels of a moving vehicle. Nevertheless, that’s what we did at Culture Trip: we modernized our front end and decoupled it from our Wordpress site, all while growing as a company, maintaining legacy code, delivering new features, recruiting new talent, improving our work process, teaching new technologies and making sure our team of over 300 world-wide contributors could keep on creating and we could keep on developing. This is the story of how we made our product scale to support over 15 million users.