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Kotlin vs. Java: All-purpose Uses and Android Apps

Kotlin and Java are two powerful general-purpose languages popular for Android and beyond. We’ll discuss their top features and differences, then focus on how to smoothly transition between the two.

13-minute readContinue Reading
Gabe Giro

Gabe Giro

Gabriel is a senior Android engineer with eight years of experience building apps from scratch in Kotlin and Java, and facilitating conversions between the two languages. Gabriel has worked on multimillion-dollar apps and has industry experience at companies like HBO and Yahoo.

Investing in Unit Testing: Benefits and Approaches

Stakeholders demand quick fixes for a buggy app release. Such patching is costly, and does not always offer a complete solution. Break the cycle with unit testing, a worthwhile investment in project quality.

10-minute readContinue Reading
Dacian Florea

Dacian Florea

Dacian is a senior full-stack mobile applications developer and a contributor to the Flutter framework. He specializes in rigorous testing solutions that help companies around the world design and deliver quality software applications.

Unit Testing in Flutter: From Workflow Essentials to Complex Scenarios

Incorporate comprehensive unit testing into your Flutter project to ensure best practices and reduce bugs before—not after—the app’s release.

10-minute readContinue Reading
Dacian Florea

Dacian Florea

Dacian is a senior full-stack mobile applications developer, a Flutter expert, and a contributor to the Flutter framework. He helps companies around the world design and implement quality software solutions and deliver excellent user experiences.

Future-proof Your Android Code, Part 2: Functional Reactive Programming in Action

The functional reactive programming (FRP) paradigm is becoming increasingly mainstream. In this installment, we discuss FRP essentials like system design and libraries, and implement a sample application.

8-minute readContinue Reading
Iliyan Germanov

Iliyan Germanov

Iliyan is an Android developer and CTO who has founded four startups and created several top-rated apps, including Ivy Wallet, which has received 10 YouTube tech community “best UI/UX” awards. He specializes in functional programming, UX, Kotlin, and Haskell.

The Foundations of Functional Reactive Programming in Android

This tutorial explores the mathematical concepts behind two key programming paradigms, functional programming and reactive programming, so you can build long-lasting Android architecture.

12-minute readContinue Reading
Iliyan Germanov

Iliyan Germanov

Iliyan is an Android developer and CTO who has founded four startups and created several top-rated apps, including Ivy Wallet, which has received 10 YouTube tech community “best UI/UX” awards. He specializes in functional programming, UX, Kotlin, and Haskell.

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WebAssembly/Rust Tutorial: Pitch-perfect Audio Processing

WebAssembly gives near-native performance to web apps and allows languages other than JavaScript—plus their libraries—to be used on the web. This tutorial leverages Rust and the Web Audio API to make a basic guitar tuner app that runs at 60 FPS, even on mobile.

24-minute readContinue Reading
Peter Suggate

Peter Suggate

Peter is a full-stack developer with 15 years of experience building apps for the web and desktop.

Enhanced Git Flow Explained

Git provides basic branching operations, but advanced patterns are left up to the user. The popular “Git flow” branching model helps, but can also complicate some common procedures.

Thankfully, a new variation retains the benefits, while streamlining everyday work.

14-minute readContinue Reading
Daniel Ivanov

Daniel Ivanov

Daniel has helped startups bring products to market for more than a decade using best-of-breed approaches to HTML/CSS, JS, Python, and C#.

A Splash of EarlGrey: UI Testing the Toptal Talent App

Created by Google as an in-house testing tool, EarlGrey was open-sourced in 2016, and it quickly gained a sizable following in the iOS developer community.

In this article, Toptal Senior QA Automation Engineer Ciprian Balea explains why the Toptal talent app is tested using EarlGrey and demonstrates why you should consider it, too.

8-minute readContinue Reading
Ciprian Balea

Ciprian Balea

Ciprian is a certified scrum master experienced in setting up and developing CI infrastructures and test automation frameworks in various languages.

Full-stack NLP With React: Ionic vs. Cordova vs. React Native

JavaScript frameworks based on React can help you build a fast, reliable mobile app, but it’s not always easy to determine which framework is best for your project. Choosing the wrong framework can result in an app with slow and redundant code.

JavaScript expert Sean Wang builds the same natural language processing mobile application using Cordova, Ionic, and React Native, then discusses the advantages and limitations of each.

37-minute readContinue Reading
Shanglun Wang

Shanglun Wang

Sean is a passionate polyglot: a full-stack wizard, sysadmin, and data scientist. He’s also developed market intelligence software.

Hybrid Power: Flutter Advantages and Benefits

Google’s Flutter framework has quickly caught on among developers who want to target Android and iOS from the same codebase—and businesses who know the value of a single project team yielding presence in both markets.

15-minute readContinue Reading
Asad Jibran Ahmed

Asad Jibran Ahmed

Jibran, the author of a book on building web applications with Django, is a full-stack web/mobile developer with 10+ years of experience.

Building an Android POS App That Can’t Be Closed

It’s not every day that a client asks a developer to create a mobile app that cannot be closed, but this can be a crucial feature for Point of Sale (POS) devices.

In this article, Toptal Software Developer Tudor Filip Stupariu demonstrates how he built an Android POS app that can’t be closed.

9-minute readContinue Reading
Tudor Filip Stupariu

Tudor Filip Stupariu

Tudor is a full-stack software developer focused on JavaScript. He created numerous mobile and web apps, as well as server-side apps.

Create a WhatsApp Chatbot, Not an App

Feedback on an enterprise web app prompted an experiment. Could a WhatsApp chatbot replace it? Would people like it better? Would it be more useful?

10-minute readContinue Reading
Aminadav Glickshtein

Aminadav Glickshtein

Aminadav has 20 years of professional experience. Having started coding at the age of seven, programming is like a native language to him.

Cabin Fever Coding: A Node.js Back-end Tutorial

Missing the luxury of a good, old-fashioned remote control when the laptop is beyond easy reach? Transform your old smartphone into a remote and learn some basic Node.js/Express/Pug along the way.

16-minute readContinue Reading
Kevin Bloch

Kevin Bloch

Kevin has 20+ years among full-stack, desktop, and indie game development. He lately specializes in PostgreSQL, JavaScript, Perl, and Haxe.

Taking Firebase Serverless: Mobile and Web Applications Made Easy

Mobile and web applications typically need a back-end server, which requires maintenance, updates, backups, and more. So why not dispense with them?

In this article, Toptal Java Developer Phillip Edwards outlines how you can use Google Firebase to develop serverless applications without incurring a lot of costs.

11-minute readContinue Reading
Phillip Edwards

Phillip Edwards

Phillip has extensive experience in all aspects of software development. Recently, he has been developing apps using Google Firebase.

Write Once, Deploy Everywhere: When to Go Native?

Writing multiple native applications for different mobile platforms can be a daunting task, but taking a non-native approach comes with pitfalls of its own.

In this article, Toptal Mobile Developer Joel Frank outlines the concept of Write Once, Deploy Everywhere (WODE) and explains how to choose the right development path for your project.

13-minute readContinue Reading
Joel Frank

Joel Frank

Joel is a software engineer with 15+ years of experience. He brings application writing experience from Ipsy, Raytheon, and multiple independent ventures.

Keep It Encrypted, Keep It Safe: Working with ESNI, DoH, and DoT

Internet privacy’s cutting-edge technology includes encrypted server name indication (ESNI) and encrypted DNS in the form of DNS over HTTPS (DoH). Find out what they are, why they exist, and how they work.

11-minute readContinue Reading
Brian Wojtczak

Brian Wojtczak

Brian was a system administrator and network engineer before turning to software development in an effort to automate himself out of a job.

Toptal Engineering Expert

Gabriel Courtemanche

Gabriel is a highly efficient and reliable professional who possesses a broad skill set for web application development. He's been working on a range of products and clients—from working on scalability problems in production engineering teams at Shopify and Autodesk to launching new applications for startups. Most of his work consists of leading technical teams, by creating an easy development environment, fixing technical debts, providing best practices code examples, and mentoring devs.
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