If you're building a site or app that needs to be highly available and highly (and easily) scalable, then MongoDB could offer the perfect solution. One of the most popular NoSQL systems, MongoDB is built on a horizontal scale-out architecture that can support large volumes of data and traffic and uses a document data model that allows developers to store and retrieve data quickly. This MongoDB test evaluates candidates' skills in several key areas required for running and maintaining a MongoDB database, namely security, infrastructure, performance, and reliability. Using real-world scenarios, the test evaluated how well candidates can solve various issues that can come up when using MongoDB in a regular setting for developing applications. Candidates who perform well on this test understand how to make MongoDB secure and reliable. They can also plan a good infrastructure, especially when dealing with larger data sets, to get the best performance out of MongoDB at the best cost possible and can troubleshoot different situations.