The backend is the heart of your service, if you don't have a reliable backend then you don't have a reliable service. This could mean many different things, such as inaccessible service, catastrophic bugs, and possibly the loss of users (and money) due to user frustration. Ensuring that your backend not only provides the necessary data for your front-end integrations ("Clients") so that they can maintain the highest level of performance and least amount of data-waste, but also is able to serve the requests for potentially millions of users should the need arise without increasing the cost associated exponentially is an often-overlooked issue when it comes to backend development. I focus on delivering a backend for whatever service you need, regardless if you need your data to be accessible real-time, hot-cached, cold-storage, and with or without session context. There's many complexities that are not often thought out when it comes to planning and executing a backend, I have experiencing not only building and designing backends that have supported hundreds of thousands of active users, but I also actively work with businesses that support millions of users. Almost anyone can throw together an API that will work, but how well will it work when you need it to the most? and if it does work... what will it cost?