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About the test:

The Full Stack Developer Online Test uses scenario-based multiple choice questions to evaluate candidates on their technical knowledge and practical skills related to full stack development, covering topics such as web development, front-end technologies, back-end technologies, databases, API design, security, testing, and deployment. The test also includes a coding question to evaluate candidates' hands-on programming skills. The test aims to determine candidates' ability to deliver high-quality, scalable, and maintainable web applications that meet business requirements.

Covered skills:

  • REST APIs
  • Coding
  • Data Structures
  • Optimization
  • Web Fundamentals
  • Databases
  • Algorithms

9 reasons why
9 reasons why

Adaface Full Stack Developer Assessment Test is the most accurate way to shortlist Full Stack Developers



Reason #1

Tests for on-the-job skills

The Full Stack Developer 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:

  • Able to design and develop responsive frontend applications
  • Proficient in backend development using popular frameworks and technologies
  • Strong understanding of HTML and CSS for creating visually appealing UI/UX
  • Experience in building and consuming REST APIs
  • Skilled in coding and problem-solving
  • Familiarity with working with databases
  • Knowledge of data structures and algorithms for efficient programming
  • Ability to optimize code for performance
  • Understanding of web fundamentals for building robust applications
  • Proficient in using version control systems like Git
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

Non-googleable 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 10,000+ questions. The actual questions on this Full Stack Engineer Test will be non-googleable.

🧐 Question

Medium

Form Logs
Forms
Solve
A web app for a popular AI conference (conducted in New York, with attendees from around the world) uses a signup/login page before users can access their dashboard. The signup/login page uses a form for users to input details and submit. The details are then sent to the backend service for processing. All user actions are logged in a log server. Senior Frontend Engineer, Musk, observed patterns in the issues users are facing with the the web app. Here are the two common patterns that Musk observed in the issues that have been occurring for most users:
 image
 image
Which of the following should Musk do to enhance the user experience with the page?

A: Implement validation using JS event listeners on client-side (e.g., on input or change)
B: Utilize HTML5 built-in form validation attributes (e.g., required, pattern)
C: Use server-side validation and refresh the page on form submission
D: Use a serverless function that processes the user’s form details, saves the user’s entries in the database and responds with validation data

Medium

Interactive Application
JavaScript Rendering
Solve
A senior front-end engineer is tasked with optimizing the loading speed of a web application. The current bottleneck is the large number of JavaScript files that must be downloaded before the application becomes interactive. The engineer noticed that the browser spends a lot of time parsing and executing the JS code before making the application interactive. Which of the following techniques should the engineer apply to address this issue?

Medium

Broker Replication
System Design
Solve
You are working on a large-scale, distributed, and fault-tolerant message processing system designed to handle high throughput and low latency requirements. The system is based on the publish-subscribe pattern and uses multiple brokers to distribute messages across various topics and partitions. In this architecture, both publishers and subscribers are considered clients. The brokers are responsible for replicating messages among themselves to ensure fault tolerance and data durability.
 image
A client reports successfully publishing a message on a specific topic. However, one of the subscribers has not received the message. To investigate the issue, you have gathered detailed logs and system design data, as shown below:
 image
Based on the information provided, which of the following is the most likely reason for the issue?

A: The message was not published on the topic
B: Client C is not subscribed to the correct topic
C: There is a replication lag between brokers B1 and B2
D: Client C is consuming from the wrong broker
E: The message processing system failed to acknowledge the message

Medium

Load Balancer Latency
Debugging
Solve
A backend service is experiencing intermittent latency spikes while processing incoming requests. The service is deployed in a multi-node environment with a load balancer in front. You suspect that the issue might be related to resource contention. You collect the following performance metrics from the affected nodes during a spike:
 image
Which of the following is the most probable cause of the latency spikes?
A: High memory usage on the affected nodes.
B: Disk I/O bottlenecks on the affected nodes.
C: Insufficient CPU resources on the affected nodes.
D: Uneven distribution of incoming requests by the load balancer.
E: Network latency between the load balancer and the backend nodes.

Easy

Background Properties
Solve
Consider the following shorthand CSS example:

background: #f7f7f7 url(jolie.jpg) no-repeat scroll 0px 0px;

Which of the following show the individual background properties represented by the shorthand:
 image

Easy

Colorful sentences
Solve
Our intern is writing a colorful blog post, and has written the following code. What colors will the sentences be?
 image
A: Sentence 1 will be gray, Sentence 2 will be pink.
B: Both sentences will be gray.
C: Sentence 1 will be pink, Sentence 2 will be gray.
D: Both sentences will be pink.
E: The code does not make sense; will throw an error.

Easy

Links
Solve
In the following HTML, what will be the color of link with class "mark"
 image

Medium

Let's Hack
CSS Property
Solve
Consider the following HTML and CSS:
 image
 image
Which additional CSS rule(s) will render the following image? Choose ALL that apply.
 image
A:
div{
  flex-direction : column;
  align-items : center;
}
B:
div{
  flex-direction : row;
  align-items: center;
}
C:
div{
  flex-direction: column;
  justify-content: center;
}
D:
div{
  flex-direction: row;
  justify-content: center;
}

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

Medium

Form Logs
Forms

3 mins

Frontend
Solve

Medium

Interactive Application
JavaScript Rendering

2 mins

Frontend
Solve

Medium

Broker Replication
System Design

3 mins

Backend
Solve

Medium

Load Balancer Latency
Debugging

3 mins

Backend
Solve

Easy

Background Properties

2 mins

HTML/CSS
Solve

Easy

Colorful sentences

2 mins

HTML/CSS
Solve

Easy

Links

2 mins

HTML/CSS
Solve

Medium

Let's Hack
CSS Property

3 mins

HTML/CSS
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Form Logs
Forms
Frontend
Medium3 mins
Solve
Interactive Application
JavaScript Rendering
Frontend
Medium2 mins
Solve
Broker Replication
System Design
Backend
Medium3 mins
Solve
Load Balancer Latency
Debugging
Backend
Medium3 mins
Solve
Background Properties
HTML/CSS
Easy2 mins
Solve
Colorful sentences
HTML/CSS
Easy2 mins
Solve
Links
HTML/CSS
Easy2 mins
Solve
Let's Hack
CSS Property
HTML/CSS
Medium3 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

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!


Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Full Stack Engineer Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Full Stack Engineer Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the Full Stack Developer Online Test

Why you should use Pre-employment Full Stack Developer Test?

The Full Stack Engineer Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Building responsive and user-friendly web interfaces using HTML and CSS
  • Developing RESTful APIs for front-end communication with backend servers
  • Implementing efficient data structures and algorithms for optimized performance
  • Working with databases to store and retrieve data for web applications
  • Debugging and troubleshooting issues in a full stack development environment
  • Optimizing code and improving performance of web applications
  • Handling security and authentication in web applications
  • Testing and debugging code to ensure quality and reliability
  • Creating scalable and modular code for easier maintenance and future enhancements

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Full Stack Developer Test?

  • REST APIs

    REST APIs (Representational State Transfer Application Programming Interfaces) are a set of rules and conventions for building web services that allow different software applications to communicate with each other. They enable data exchange and integration between systems, making them a vital skill for full stack developers.

  • Web Fundamentals

    Web fundamentals encompass the foundational concepts and technologies used in web development, such as HTML, CSS, and JavaScript. Understanding these core components is essential for building and designing web applications that are user-friendly and scalable.

  • Coding

    Coding refers to the process of translating logical instructions into a language that a computer can understand. Proficiency in coding, particularly in languages like JavaScript, Python, or Java, is crucial for implementing functionalities and creating interactive features in web applications.

  • Databases

    Databases are used for storing, managing, and retrieving large amounts of structured data efficiently. Full stack developers need to have a solid understanding of database concepts and technologies like relational databases (such as MySQL) or NoSQL databases (such as MongoDB) to design and develop robust backend systems.

  • Data Structures

    Data structures are fundamental tools for organizing and manipulating data in a computer program. A strong grasp of various data structures, such as arrays, linked lists, stacks, and queues, enables developers to optimize code performance and solve complex programming problems effectively.

  • Algorithms

    Algorithms are step-by-step procedures for solving specific computational problems. Proficiency in understanding, designing, and implementing algorithms is essential for solving coding challenges, optimizing performance, and creating efficient solutions in software development.

  • Optimization

    Optimization involves improving the efficiency and performance of software applications. Full stack developers should possess the skill to analyze and optimize code, databases, and system architecture to enhance application speed, scalability, and resource utilization.

  • Full list of covered topics

    The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Full Stack Engineer Test to be based on.

    HTML
    CSS
    JavaScript
    React
    Angular
    Vue
    Redux
    Node.js
    Express.js
    REST
    APIs
    Database
    SQL
    MongoDB
    NoSQL
    Data Structures
    Algorithms
    OOP
    HTTP
    HTML5
    CSS3
    AJAX
    DOM
    Responsive Design
    Web Security
    Cookies
    Sessions
    Caching
    Performance Optimization
    Error Handling
    Assertions
    Web Hooks
    Authentication
    Authorization
    JWT
    Cross-Origin Resource Sharing
    Unit Testing
    Integration Testing
    Code Quality
    Linting
    Debugging
    Git
    GitHub
    Bitbucket
    Agile Methodology
    Scrum
    UI/UX Design
    Wireframing
    CLI
    Command Line
    CRUD
    Regex
    Frontend Framework
    Backend Framework
    Responsive Layout
    Browser Compatibility
    Web Optimization
    Deployment
    Continuous Integration
    CI/CD
    Containerization

What roles can I use the Full Stack Developer Test for?

  • Full Stack Developer
  • Web Developer
  • Software Engineer
  • Application Developer
  • API Developer

How is the Full Stack Developer Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Designing and developing efficient relational databases for data management
  • Implementing caching mechanisms for improved application speed
  • Securing and protecting data from potential breaches and attacks
  • Analyzing and optimizing code for memory and CPU usage
  • Implementing automated testing techniques for efficient code validation
  • Integrating third-party APIs and services for enhanced functionality
  • Designing and implementing scalable and efficient RESTful architectures
  • Implementing data validation and sanitization to prevent security vulnerabilities
  • Utilizing version control systems for efficient code management and collaboration

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

Full Stack Developer Hiring Test FAQs

Can I combine multiple skills into one custom assessment?

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.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

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.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

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.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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40 min tests.
No trick questions.
Accurate shortlisting.
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