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About the test:

The SOLID Technical Aptitude Online Test uses scenario-based MCQs to evaluate candidates on their understanding of software design principles based on SOLID principles. The test assesses candidates on their knowledge of Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion principles, as well as their ability to apply these principles in designing and implementing software systems. It also evaluates their familiarity with design patterns, refactoring techniques, code smells, and anti-patterns related to SOLID principles.

Covered skills:

  • SOLID Principles
  • Technical Aptitude
  • Object Oriented Design
  • Data Structures

9 reasons why
9 reasons why

Adaface SOLID, Technical Aptitude & Coding Test is the most accurate way to shortlist Software Engineers

Reason #1

Tests for on-the-job skills

The SOLID, Technical Aptitude & Coding 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:

  • Understanding and applying SOLID Principles
  • Designing and implementing Object-Oriented Design concepts
  • Demonstrating technical aptitude in problem-solving
  • Working with various data structures
  • Writing clean and maintainable code
  • Understanding and implementing design patterns
  • Handling exceptions and errors efficiently
  • Optimizing code for performance
  • Working with relational databases
  • Using version control systems effectively
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 SOLID, Technical Aptitude & Coding Test will be non-googleable.

🧐 Question


Paint says Bye!
Which SOLID principle is followed by the given code snippet?


What does the following pseudo code print?


Fibonacci codes
Time Complexity
Pseudo Code
Here are three pseudocodes for calculating the Nth Fibonacci number. Which of the following statements about these codes are true?
A: Time complexity/efficiency of CODE 1, CODE 2, CODE 3 is the same.
B: CODE 2 is more space-efficient than CODE 3.
C: CODE 3 is more space-efficient than CODE 2.
D: CODE 2 is more time-efficient than CODE 1.
E: CODE 3 is more time-efficient than CODE 1.


Palindrome Test cases
Go through the following faulty palindrome detection pseudocode and test cases. For which of the test cases would the code return true?
A: a
B: aba
C: aaa
D: aac


Rewards Activities Order
Database Connection
A new popular app tracks the activities performed by its users and grants them rewards based on each individual's total activities performed in a year. This data is maintained in a database table (activitesinfo), with the following columns: userid, totalactivities, reward. This year, due to fundraising activity, the company has decided to further reward its users by enhancing the reward as per the following formula: If reward < = 4000, increase it by 2%, If 4000 < reward <= 8000, increase it by 4%, If reward > 8000, increase it by 6%.
The tech team has written three different scripts to calculate increment for each slab, each script is to run as a separate transaction. Here are the three scripts:
Script 1:
For users with reward <= 4000, set reward = reward * 1.02

Script 2:
For users with reward > 4000 and reward <= 8000, set reward = reward * 1.04

Script 3:
For users with reward > 8000, set reward = reward * 1.06
Each script is to be executed separately. Which of the following options will update the rewards as expected:
A: Execute Script 1 followed by Script 2 followed by Script 3
B: Execute Script 2 followed by Script 3; Script 1 running concurrently throughout
C: Execute Script 3 followed by Script 2; Script 1 running concurrently throughout
D: Execute Script 3 followed by Script 2 followed by Script 1
E: Execute Script 2 followed by Script 3 followed by Script 1
🧐 Question🔧 Skill


Paint says Bye!

2 mins




2 mins

Technical Aptitude


Fibonacci codes
Time Complexity
Pseudo Code

2 mins

Technical Aptitude


Palindrome Test cases

2 mins

Technical Aptitude


Rewards Activities Order
Database Connection

3 mins

Technical Aptitude
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Paint says Bye!
Easy2 mins
Technical Aptitude
Medium2 mins
Fibonacci codes
Time Complexity
Pseudo Code
Technical Aptitude
Hard2 mins
Palindrome Test cases
Technical Aptitude
Hard2 mins
Rewards Activities Order
Database Connection
Technical Aptitude
Medium3 mins
Reason #4

1200+ customers in 75 countries

customers in 75 countries

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 SOLID, Technical Aptitude & Coding 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 SOLID, Technical Aptitude & Coding 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

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 SOLID, Technical Aptitude & Coding Assessment Test

Why you should use Pre-employment SOLID, Technical Aptitude & Coding Online Test?

The SOLID, Technical Aptitude & Coding 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:

  • Applying SOLID principles in software development
  • Designing and implementing object-oriented design patterns
  • Demonstrating proficiency in technical aptitude
  • Utilizing various data structures in problem-solving
  • Implementing clean code practices
  • Performing unit testing and test-driven development
  • Optimizing code for performance and scalability
  • Debugging and troubleshooting software applications
  • Collaborating with cross-functional teams
  • Utilizing version control systems

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 SOLID, Technical Aptitude & Coding Online Test?

  • SOLID Principles

    The SOLID principles are a set of five design principles in object-oriented programming that aim to make software systems more maintainable and extensible. They include the Single Responsibility Principle (SRP), Open/Closed Principle (OCP), Liskov Substitution Principle (LSP), Interface Segregation Principle (ISP), and Dependency Inversion Principle (DIP). By measuring this skill, recruiters can assess a candidate's understanding of these principles and their ability to apply them in software design.

  • Object Oriented Design

    Object-oriented design is a programming paradigm that organizes software applications into modular components called objects, which have state, behavior, and identity. It promotes code reusability, maintainability, and scalability. Measuring this skill helps recruiters evaluate a candidate's proficiency in designing software systems using the principles of object-oriented programming.

  • Technical Aptitude

    Technical aptitude refers to a candidate's ability to understand and apply technical concepts and principles in problem-solving and decision-making scenarios. It involves skills such as logical reasoning, analytical thinking, attention to detail, and problem-solving ability. Assessing technical aptitude in this test allows recruiters to gauge a candidate's overall technical competency and their potential to excel in a technical role.

  • Data Structures

    Data structures are the fundamental building blocks of organizing and storing data in computer memory. They provide efficient ways to perform operations like searching, sorting, and manipulating data. Measuring this skill enables recruiters to assess a candidate's knowledge and ability to choose appropriate data structures for efficient algorithmic problem-solving and software development.

  • 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 SOLID, Technical Aptitude & Coding Test to be based on.

    Single Responsibility
    Liskov Substitution
    Interface Segregation
    Dependency Inversion
    Static Methods
    Java Streams
    Sorting Algorithms
    Big O Notation
    Binary Search
    Linked Lists
    Binary Trees
    Hash Tables
    Concurrent Programming
    Garbage Collection
    Memory Management
    Database Normalization
    SQL Queries
    Stored Procedures
    Normalization Forms
    Data Modeling
    Transaction Management
    Testing Techniques
    Code Reviews
    Code Optimization
    Design Patterns
    Concurrency Patterns
    Creational Patterns
    Structural Patterns
    Behavioral Patterns
    Code Versioning
    Branching and Merging
    Git Commands
    Continuous Integration
    Continuous Delivery
    Build Automation
    Unit Testing
    Integration Testing
    Code Coverage
    Agile Methodology
    Scrum Framework
    Kanban Boards
    Pair Programming
    Technical Documentation

What roles can I use the SOLID, Technical Aptitude & Coding Online Test for?

  • Software Engineer
  • Full Stack Developer
  • Backend Developer

How is the SOLID, Technical Aptitude & Coding Online 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

  • Applying design principles for user interface development
  • Working with relational databases and SQL
  • Using algorithms and data structures for efficient coding
  • Implementing code security measures
  • Integrating third-party libraries and APIs
  • Understanding and optimizing database queries
  • Developing and maintaining documentation
  • Analyzing and resolving software defects
  • Applying Agile and Scrum methodologies
  • Keeping up with industry trends and best practices
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.

reduction in screening time

SOLID, Technical Aptitude & Coding 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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