Toptal Engineering Blog

The increasing accuracy of machine learning systems has resulted in a flood of applications using them. As machine learning models matured and improved, so did ways of attacking them.

In this article, Toptal Python Developer Pau Labarta Bajo examines the world of adversarial machine learning, explains how ML models can be attacked, and what you can do to safeguard them against attack.

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.

Flask is a great way to get up and running quickly with a Python applications, but what if you wanted to make something a bit more robust?

In this article, Toptal Freelance Python Developer Ivan PoleschyuI shares some tips and useful recipes for building a complete production-ready Flask application.

There are a number of ways of implementing animated full-screen layouts with a large degree of human interaction, and many developers would resort to a JavaScript plugin to save time.

In this article, Toptal JavaScript Developer Stefan Vitasovic demonstrates how you can do it using nothing but CSS and JavaScript, without including a bloated library or plugin in your project.

Types and testable code are two of the most effective ways of avoiding bugs. In this tutorial, discover TypeScript best practices while you create a Discord bot from scratch.

Swift is great, but what if your application relies on a library that’s written using C++? Luckily Objective-C++ is here to save the day.

In this article, Toptal Freelance Swift Developer Josip Bernat integrates C++ code with Swift by using wrapper classes as a bridge and then creates an app that recognizes the Toptal logo using OpenCV.

GraphQL is a query language for APIs and can be used to query data from a server while also allowing clients to specify exactly what data is needed.

Toptal Freelance Developer Christopher Moore explains how to create a GraphQL server using the Laravel Framework along with walking through some examples including querying relationships, mutations, and authentication.

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.

With a static site generator back end in place from Part 1, now it’s time to implement a Gatsby.js-based front end, host it on Netlify, and get AWS to activate the whole pipeline.

Wikipedia describes Reactive Programming as “an asynchronous programming paradigm concerned with data streams and the propagation of change,” but what is it really?

In this article, Toptal Freelance WPF Developer Denis Jesus Gonzalez Sanchez demonstrates a WPF app using ReactiveUI with the MVVM pattern and uses it to access a REST API.

GraphQL is a query language for APIs, originally developed by Facebook for internal use. Since its public release, GraphQL has been compared to REST and other architectures.

In this article, Toptal JavaScript Developer Marcos Henrique da Silva demonstrates how to create a GraphQL Node.js API, and explains why you should try it, too.

Static websites are simple and fast, but it’s also possible to automate updates to them to keep them fresh and relevant. Find out how to generate daily-updated HTML pages that track the latest releases of popular GitHub repositories.

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?

T9 predictive text has been around for ages, and it lost relevance with the advent of modern smartphones. However, T9 can still be a useful addition to certain types of apps on iOS.

In this article, Toptal Swift Developer George Vashakidze explains why T9 can still be useful and practical, and how you can add it to your next iOS app.

Cross-platform mobile apps are increasingly being built with React Native. But how can you scan for QR codes and augment the user’s camera view when they’re present?

The WebSocket protocol is one of the ways to make your application handle real-time messages. The most common alternatives are long polling and server-sent events. This article shows how to implement WebSockets with the Spring Boot framework and use STOMP for effective client-server communication.