Project Management

Nearly every app requires an authorization system on top of an authentication system. We often need a fine-grained permissions model to allow only specific users to access certain resources while simultaneously restricting access for everyone else. In this tutorial, Toptal Freelance Firebase Developer Joaquin Cid teaches how to build just such a system. Called a role-based authentication, we’ll learn how to implement this system in an API using Node.js and Firebase.

Subscription-based apps need a special approach when it comes to analytics. Learn how a variation on the traditional sales funnel helps you work with LTV, subscriber retention, and churn rates to make your app better—and more profitable.

Building a mobile app isn't cheap—and the harsh reality is that most apps fail. Find out how to leverage fundamental analytics metrics to make sure your app actually turns a profit.

DevOps is an oft-misunderstood buzzword, seen as a trendy must-have in the form of technologies, tools, and staff to acquire. But it's much more, yet much simpler, than that.

You can just write sequentially executed code in JavaScript, but should you? In this article, Toptal Freelance JavaScript Developer Omar Waleed tests the widespread Node.js belief that synchronous code degrades performance and is, in a sense, just plain evil. Is this really true?

When complex systems are life-critical, it can be extremely difficult to modernize and upgrade them safely. While many engineers will never work on such systems, there is much to be learned from those who do. In this article, Toptal Solutions Architect Dr. Kyle Kotowick explains how to properly maintain and update systems that are too important to fail.

Join an expert in a look back in horror at his most embarrassing mistakes in his early days as a WordPress developer. He discusses general PHP bugs, WordPress-specific bugs, and also mistakes made at a managerial level while supervising other developers.

Project management tools have dramatically transformed the way software is engineered, but which one should you use, and when? In this article, Toptal Freelance Developer Juan Carlos Arias Ambriz outlines the differences between Jira and Trello and explains how you should choose between them.