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Dart is a general-purpose programming language initially developed by Google in 2011. It was created to address the challenges in web development, presenting solutions for speed, safety, and ease of use. Dart's design was inspired by several other languages such as JavaScript and Java, with the aim of optimizing performance for both client-side and server-side development. It gained prominence with the introduction of Flutter, Google's UI toolkit for crafting beautiful applications for mobile, web, and desktop from a single codebase. Today, Dart continues to be maintained by the Dart Team at Google, ensuring its relevance and growth in the modern programming landscape.

Ask the right questions secure the right Dart talent among an increasingly shrinking pool of talent.

First 20 minutes

General Dart app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in Dart application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

How would you declare a variable in Dart?

You can declare a variable in Dart using the 'var' keyword followed by the variable name. For example, 'var name;' declares a variable named 'name'.

What are the different types of variables in Dart?

Dart has several types of variables including int, double, String, bool, and dynamic.

How would you define a function in Dart?

A function in Dart can be defined using the 'void' keyword followed by the function name and parentheses. For example, 'void myFunction() {}' defines a function named 'myFunction'.

What is the difference between final and const in Dart?

In Dart, both 'final' and 'const' keywords are used to declare a constant. The difference is that 'final' is evaluated at runtime, while 'const' is evaluated at compile-time.

How would you handle exceptions in Dart?

Exceptions in Dart can be handled using 'try-catch' blocks. The 'try' block contains the code that might throw an exception, and the 'catch' block contains the code to handle the exception.

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What you’re looking for early on

Does the candidate demonstrate a strong understanding of Dart language?

How well does the candidate understand Flutter?

Can the candidate solve problems efficiently?

Is the candidate able to work in a team?

Next 20 minutes

Specific Dart development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What are Futures in Dart?

Futures in Dart represent a potential value or error that will be available at some time in the future. They are used for asynchronous programming.

How would you create a class in Dart?

A class in Dart can be created using the 'class' keyword followed by the class name. For example, 'class MyClass {}' creates a class named 'MyClass'.

What is the difference between == and === in Dart?

In Dart, '==' is used for equality comparison, while '===' does not exist. Dart only has '==' for equality comparison and it checks both the type and value.

How would you implement inheritance in Dart?

Inheritance in Dart can be implemented using the 'extends' keyword. For example, 'class ChildClass extends ParentClass {}' creates a child class that inherits from the ParentClass.

What are mixins in Dart?

Mixins in Dart are a way of reusing a class's code in multiple class hierarchies. They are defined using the 'mixin' keyword.

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At this point, a skilled Dart engineer should demonstrate strong problem-solving abilities, proficiency in Dart programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with Dart.

What does the following Dart code do?
void main() {
  print('Hello, World!');
}
This code prints 'Hello, World!' to the console.
What will be the output of the following Dart code?
void main() {
  var num1 = 10;
  var num2 = 20;
  print(num1 + num2);
}
The output of this code will be 30. It adds two numbers, num1 and num2, and prints the result.
What does the following Dart code do?
void main() {
  List numbers = [1, 2, 3, 4, 5];
  numbers.removeAt(2);
  print(numbers);
}
This code removes the third element from the list 'numbers' and prints the updated list.
What does the following Dart code do?
import 'dart:async';
void main() {
  Future.delayed(Duration(seconds: 4), () => print('Hello, World!'));
}
This code prints 'Hello, World!' to the console after a delay of 4 seconds.

Wrap-up questions

Final candidate for Dart Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle Dart application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you create a singleton in Dart?

A singleton in Dart can be created by making the class constructor private and defining a static instance of the class that is returned by a factory constructor.

What is the difference between a Stream and a Future in Dart?

In Dart, a Future represents a single asynchronous response, while a Stream is a sequence of asynchronous events. A Stream can be thought of as an asynchronous Iterable.

How would you use async and await in Dart?

In Dart, 'async' and 'await' are used for asynchronous programming. The 'async' keyword is used to declare an asynchronous function, and the 'await' keyword is used to pause execution until a Future is resolved.

Dart application related

Product Perfect's Dart development capabilities

Beyond hiring for your Dart engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in Dart projects, and can engage in multiple capacities.

Dart Consultive assessments

Dart Application Conversion Assessment Dart Application Integration Assessment Dart Data & Database Integration Assessment

Custom Dart development projects

Custom Dart App Conversion Dart Custom App Development Process App UI Design for Dart Facelifts

Hiring guide for Dart Engineers

Dart Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the Dart engineer at this point.

Dart Consultive assessments

Custom Dart development projects