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Kotlin Online Test

The Kotlin Online Test uses scenario-based and code tracing MCQ questions to evaluate a candidate's ability to use Kotlin basics (Variables, Strings), Kotlin Collections (List, Map, Set, Iterators), and Kotlin OOPs (classes, inheritance, interfaces) to develop null-safe, concise and readable Kotlin code. The test has coding questions to evaluate hands-on Kotlin programming skills.

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Screen candidates with a 40 mins test

Test duration:  ~ 40 mins
Difficulty level:  Moderate
Availability:  Available as custom test
Questions:
  • 7 Kotlin MCQs
  • 1 Kotlin Coding Question
Covered skills:
Kotlin basics (Variables; Strings; Functions)
Kotlin collections (Lists; Set; Maps; Iterators)
Object-Oriented Programming (Classes; Inheritance)
Reading and Writing Files
Standard functions (apply; let; with; run)
Extension functions
Working with APIs
Adding dependencies
Asynchronous Programming (Coroutines)
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Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Use the Kotlin Test to shortlist qualified candidates

The Kotlin Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to understand and use variables, strings, and functions in Kotlin
  • Understanding and working with Kotlin collections such as lists, sets, maps, and iterators
  • Knowledge of object-oriented programming concepts like classes and inheritance in Kotlin
  • Familiarity with reading and writing files in Kotlin
  • Understanding and utilization of standard Kotlin functions like apply, let, with, and run
  • Ability to create and use extension functions in Kotlin
  • Experience in working with APIs in Kotlin
  • Knowledge of adding and managing dependencies in Kotlin
  • Understanding of asynchronous programming with coroutines in Kotlin
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Screen candidates with the highest quality questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Kotlin Online Test will be non-googleable.

🧐 Question

Easy

twoWheeler Interface
OOPs
Solve
What will the following code output?
 image

Easy

Secondary Constructor
OOPs
Solve
What does the following Kotlin code print?
 image

Easy

Registration Queue
Logic
Queues
Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.
For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.
⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

Medium

Visitors Count
Strings
Logic
Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 
Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 
⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.
🧐 Question🔧 Skill

Easy

twoWheeler Interface
OOPs

3 mins

Kotlin
Solve

Easy

Secondary Constructor
OOPs

2 mins

Kotlin
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
twoWheeler Interface
OOPs
Kotlin
Easy3 mins
Solve
Secondary Constructor
OOPs
Kotlin
Easy2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve

Test candidates on core Kotlin Hiring Test topics

Kotlin basics: Kotlin basics covers the foundational concepts of the Kotlin programming language, including variables, strings, and functions. Understanding these basics is crucial as they form the building blocks for any Kotlin application.

Kotlin collections: Kotlin collections enable the organization and manipulation of data. This skill covers various types of collections such as lists, sets, maps, and iterators, which are essential for efficient data handling in Kotlin applications.

Object-Oriented Programming: Object-Oriented Programming (OOP) is a paradigm used to model real-world entities through classes and objects. This skill focuses on concepts like classes, inheritance, and polymorphism, which play a key role in designing modular and maintainable Kotlin code.

Reading and Writing Files: Reading and writing files is a fundamental skill for accessing and manipulating data stored in files. By understanding this skill, developers can efficiently interact with external resources and handle operations such as reading from and writing to files in Kotlin.

Standard functions: Standard functions in Kotlin, such as apply, let, with, and run, provide concise syntax to perform common operations. Mastery of these functions enhances code readability, reusability, and overall code quality in Kotlin.

Extension functions: Extension functions allow developers to extend existing classes with additional functionalities. This skill enables developers to write concise and reusable code by defining extension functions that enhance the capabilities of existing Kotlin classes.

Working with APIs: Working with APIs involves integrating external services and retrieving data from various sources using network requests in Kotlin. This skill is essential for developing applications that interact with web services, databases, and other external resources.

Adding dependencies: Adding dependencies in Kotlin allows developers to leverage existing libraries and frameworks to enhance their applications. Understanding how to add and manage dependencies is crucial for efficiently utilizing third-party code and minimizing development time.

Asynchronous Programming: Asynchronous programming using coroutines enables developers to write non-blocking and efficient code that can handle concurrency and parallelism effectively. This skill is particularly important in modern application development, as it allows for smooth execution of time-consuming tasks without blocking the main thread.

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With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

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We evaluated several of their competitors and found Adaface to be the most compelling. Great library of questions that are designed to test for fit rather than memorization of algorithms.

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Have questions about the Kotlin Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

What roles can I use the Kotlin Test for?

Here are few roles for which we recommend this test:

  • Android Developer
  • Kotlin Developer
  • Backend Developer
  • Full Stack Developer
  • Software Engineer
  • Mobile Developer
  • Frontend Developer
  • Java Developer
Can I see a sample test, or do you have a free trial?

Yes!

The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

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