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.

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Ethereum Oracle Contracts: Can We Trust the Oracle?

by John R. Kosinski

The whole point of smart contracts is that they need to be more secure and efficient than traditional contracts. So where do smart contract oracles fit in? In the final installment of our three-part series, Toptal Blockchain Developer John R. Kosinski explains the role of oracles in the evolution of trust.

19 minute readContinue Reading
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Top Level Control with Redux State Management: A ClojureScript Tutorial

by Luke Tomlin

ClojureScript is the tool of choice for front-end developers who have tried it. Recently in this series, we showed how to use it to get started with React. In today's tutorial, Toptal Freelance Clojure Developer Luke Tomlin dives into how to use Redux for React state management in ClojureScript.

10 minute readContinue Reading
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Working With Static Patterns: A Swift MVVM Tutorial

by Lucas van Dongen

Real-time data-driven apps create new challenges in the way we structure our programs, especially on mobile. In this article, Toptal Freelance iOS Developer Lucas van Dongen implements an iOS chat app, comparing the classic MVC approach with a static immutable MVVM pattern.

21 minute readContinue Reading
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Terraform AWS Cloud: Sane Infrastructure Management

by Radosław Szalski

Writing an application is only part of the story. In order for it to be of value, it needs deploying somewhere it can scale; it has to run with high availability, have backups, and so on. Deployment and infrastructure management isn’t a simple process. And Terraform does nothing to hide the complexity. However, it does make your infrastructure declarative and reproducible, like your code. In this article, Toptal Freelance DevOps Engineer Radosław Szalski teaches us what Terraform is, how its components work, and how to configure an entire AWS Cloud solution in minutes using its configuration language.

24 minute readContinue Reading
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Is It Time to Use Node 8?

by Youssef Sherif

Node 8 has brought significant performance and feature upgrades. Should you use it on new projects? Is it worth upgrading existing codebases? In this article, Toptal Freelance JavaScript Developer Youssef Sherif gives a tour of Node 8's biggest changes and what they mean for your project.

13 minute readContinue Reading
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A Deep Dive into Entity Framework Performance When Using "Contains"

by Anton Shkuratov

Entity Framework is a great tool, but in some cases its performance is slow. One such case arises when complex queries use "Contains". Join Toptal .​NET Developer Anton Shkuratov in exploring how performance issues can be mitigated and finding the best approach to this type of complex queries.

8 minute readContinue Reading
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Ethereum Oracle Contracts: Solidity Code Features

by John R. Kosinski

Solidity is the programming language of choice for Ethereum and the de facto industry standard for smart contract development. In the second article of our three-part series, Toptal Blockchain Developer John R. Kosinski takes a closer look at Solidity quirks and features, explaining how to make the most of it.

21 minute readContinue Reading
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Option/Maybe, Either, and Future Monads in JavaScript, Python, Ruby, Swift, and Scala

by Alexey Karasev

If you're searching for the holy grail of bug-free code in JavaScript, Python, Ruby, Swift, and/or Scala, look no further! This monad tutorial by Toptal Freelance Functional Programmer Alexey Karasev takes you from category theory to the practical implementations of the Option/Maybe, Either, and Future monads, plus a sample program—in all five languages.

24 minute readContinue Reading

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