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RxJS Online Test to assess candidates' RxJS skills for efficient web development

The RxJS Online Test is a pre-employment test to assess a candidate's skills and knowledge of Reactive Extensions for JavaScript (RxJS). The test aims to determine if the applicant understands the crucial concepts of the RxJS library for reactive programming and its various components.

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Inside this RxJS Developer Test

The RxJS Test is a technical assessment given to candidates by a potential employer before hiring. The test helps to screen and shortlist the best candidates before an interview during the hiring process. It is an ideal pre-hire test for the hiring experts to ascertain candidates' fitment for RxJS developer jobs by gauging their technical proficiency, domain knowledge and on-the-job skills.

This 60-minute assessment includes 19 multiple-choice questions (MCQs) and one coding problem to test a candidate's conceptual understanding and hands-on experience with reactive extensions for JavaScript. The test is designed to help evaluators understand whether a job applicant has the requisite skills to perform the various aspects of a role. Developed and validated by the best industry experts, the test questions are laid out according to the responsibilities outlined in the open position.

In addition, the test result provides insights into each candidate's skills-related strengths and gaps (if any), allowing recruiters to identify the job-fit candidates who can be considered for the following stages of the hiring process. In a nutshell, the primary purpose of administering this RxJS Test is to shortlist the right talent for a job interview.

The test helps to screen candidates for the following roles:  

  • RxJS developer 
  • UI developer (RxJS, Angular) 
  • Web application developer- RxJS 
  • Mobile application developer - RxJS & React 
  • RXJS reactive programmer


RxJS is a popular JavaScript library for creating asynchronous and event-driven programs using Observables. It is an extensively used library of reactive programming to handle async tasks, callbacks, and event-based programs. It is helpful in JavaScript's async implementation as it is tedious to use JavaScript’s async without extensions.

RxJS simplifies the app development process, makes it less effort-intensive, and expedites the overall process. Incontestably, there is an increased market demand for RxJS because of its reliable functionalities for reactive programming.

RxJS developers are well-versed in creating websites and apps and know various programming languages. Thanks to its wide array of powerful operators, developers can leverage this library to make their applications even more efficient and performant.

Undoubtedly, RxJS developers are an essential part of an organization's engineering team. However, realizing the importance of having pre-eminent developers onboard and their benefits to the business is one thing. Identifying and hiring the best talent is another and even more challenging.

Understanding a candidate's potential, skills, and knowledge is critical before hiring RxJS developers. With the help of pre-employment assessments, hiring managers can determine whether applicants have the requisite skills and competencies they seek in an ideal candidate. One such test is the RXJS Developer Test, which enables recruiting managers to determine the most qualified candidate to be shortlisted for the next stage in the hiring process.

With comprehensive test reports, employers can gain a holistic overview of a candidate's proficiency or weakness in particular skills. In a nutshell, the test provides a data-driven way to assess if the test-taker has knowledge and experience of critical areas required for the open job position. 


This Software Quality Assurance Test is a part of following Skills Libraries

RxJS Online Test Competency Framework

Get a detailed look inside the test

RxJS Developer Test Competency Under Scanner

RxJS Online Test


Hands-on programming

This RxJS Test assesses an individual's coding skills on a robust coding simulator (Codelysis) by presenting a real-world problem and evaluating their capability to code in JavaScript.


Questions in this test section extend across the topics listed below: Operators and Observable, Schedulers, Stream, Error Handling, Handling Subscriptions, HTTP Poll, Pause, Resume, Advanced Features, and Architecture (push/pull).

Customize This RxJS Online Test

Flexible customization options to suit your needs

Set difficulty level of test

Choose easy, medium or hard questions from our skill libraries to assess candidates of different experience levels.

Combine multiple skills into one test

Add multiple skills in a single test to create an effective assessment. Assess multiple skills together.

Add your own questions to the test

Add, edit or bulk upload your own coding questions, MCQ, whiteboarding questions & more.

Request a tailor-made test

Get a tailored assessment created with the help of our subject matter experts to ensure effective screening.

The Mercer | Mettl RxJS Online Test Advantage

The Mercer | Mettl Edge
  • Industry Leading 24/7 Support
  • State of the art examination platform
  • Inbuilt Cutting Edge AI-Driven Proctoring
  • Simulators designed by developers
  • Tests Tailored to Your business needs
  • Support for 20+ Languages in 80+ Countries Globally

RxJS Online Test Can Be Setup in 4 Steps

Step 1: Add test

Add this test your tests

Step 2: Share link

Share test link from your tests

Step 3: Test View

Candidate take the test

Step 4: Insightful Report

You get their tests report

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Frequently Asked Questions (FAQs)

The Mercer | Mettl RxJS Online Test is tailored for recruitment. However, we do benchmark for custom sample sets as well. Please write to us about your request; we will gladly assist you. 

We have previously customized the RxJS Test reports based on the client’s needs. So please write to us with your request, and we will be glad to provide you with a solution. 

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