Toptal Blog

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 role-based authentication, we’ll learn how to implement this system in an API using Node.js and Firebase.

How has the beauty industry become extremely innovative? How did Glossier and The Ordinary approach (and crack) the problem of enticing consumers, building brand loyalty and creating unique experiences? The lessons are relevant for all DTC companies.

By adopting the smart home, are we forfeiting the security and intimacy our home—our most personal space—has given us over millennia?

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.

CX design encompasses EVERY interaction that a customer has with a business. By adopting a CX mindset, brand designers will learn to meaningfully engage customers at multiple touchpoints.

GraphQL is a domain-specific language for data query and manipulation by Facebook. It is meant to replace the de facto REST standard in API creation.

In this article, Toptal Freelance GraphQL Developer Ioram Gordadze creates a GraphQL API from scratch, summarizing problems new GraphQL developers face. He also teaches us to rethink the standard methods used in REST APIs in a more GraphQL-friendly manner.

Effective font combinations are a hallmark of good design. It’s vital that designers master this skill if they want to create exceptional designs that set them apart from their contemporaries.

Business value is much more than just the sum of discounted future cash flows. There are strategic elements related to equity control that also determine true worth. These factors manifest through control, liquidity, marketability, and synergistic discounts and premiums.

Integration tests provide a lot of value considering the time and effort required for testing. React integration tests improve code maintainability, yet they don’t slow down development.

In this article, Toptal Software Developer Anton Rublev demonstrates how you can harness the power of react-testing-library to create superior code without wasting time.