Toptal Engineering Blog

The Toptal Engineering Blog is a hub for in-depth development tutorials and new technology announcements created by professional software engineers in the Toptal network.

EngineeringIcon ChevronData Science and Databases

Three Principles of Data Warehouse Development

by Chamitha Wanaguru

Data warehouses aren’t exactly a new concept, but industry demand for data science services, coupled with the rise of AI and machine learning, is making them more relevant than ever. In this post, Toptal Data Warehouse Developer Chamitha Wanaguru outlines three basic principles you need to keep in mind when developing a new data warehouse.

9 minute readContinue Reading
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Changelog: The OWASP Top 10 Project

by Hrvoje Gazibara

The de facto standard for web application security is the Open Web Application Security Project’s Top 10 Project. It lists the ten most prevalent security threats based on an extensive amount of data and community feedback and was updated in late 2017. In this article, Toptal Freelance Full-stack and System Security Developer Hrvoje Gazibara discusses the changes to the OWASP Top 10’s most recent revision by illustrating new vulnerabilities, and even some that were removed.

18 minute readContinue Reading
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React Tutorial: Components, Hooks, and Performance

by Kamil Jakubczak

In recent years, React has established itself as the most popular library in the JavaScript universe. However, rather than rest on its laurels, the React team is still working hard to make it better. In the second part of our React tutorial series, Toptal JavaScript Developer Kamil Jakubczak takes a closer look at some of its features, including hooks, the latest addition to React.

16 minute readContinue Reading
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Guide to Monorepos for Front-end Code

by Alexander Noel

A monorepository is a code management and architectural concept whereby you keep all your isolated bits of code in one super repository instead of managing multiple smaller repositories—like a single repository for your website and mobile apps. In this article, Toptal Freelance Front-end Developer Alexander Noel attempts to gather and explain as much information as possible about how and when to use monorepos.

8 minute readContinue Reading
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Working with Google Sheets and Apps Script

by Wojciech Skowronek

It’s easy to start working with a spreadsheet, but it also takes time to master your skills to use all the powerful features it provides. When you start feeling comfortable with formulas, functions, pivot tables, etc., there is still one more level which allows you to achieve even more—custom extensions. In this article, I’m going to focus on extending Google Spreadsheets with a Google Apps Script that validates European Union VAT IDs via API calls.

9 minute readContinue Reading
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Using Spring Boot for OAuth2 and JWT REST Protection

by Sergio Moretti

REST APIs are used in every language and on every platform. Building a secure REST API is a must-have tool in every developer's arsenal. In this article, Toptal Freelance Java Developer Sergio Moretti shows how to secure a REST API using Spring Boot.

9 minute readContinue Reading
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Smart Node.js Form Validation

by Andrej Adamcik

Bulletproof data validation is fundamental to implementing a back-end API. Find out how datalize, a Node.js library, makes this easy—and formats your data nicely, too.

8 minute readContinue Reading
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Working with the React Context API

by Boris Yordanov

The React Context API was been around as an experimental feature for a while now but finally became safe to use in production last year, solving one major problem React problem — prop drilling. In this article, Toptal Freelance Javascript Developer Boris Yordanov will introduce us to the API and illustrate it with two basic web store apps, one built with the Context API and one without it.

5 minute readContinue Reading

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