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About the test:

The Solidity Online Test is designed to assess candidates' proficiency in the Solidity programming language, which is used to write smart contracts on the Ethereum blockchain. The test uses scenario-based MCQs to evaluate candidates' knowledge of key Solidity concepts, including data types, control structures, and function and event handling, their understanding of contract deployment, debugging, and security considerations. The test aims to assess a candidate's ability to write efficient and secure smart contracts using Solidity.

Covered skills:

  • Participant Roles
  • Chain code
  • Validation
  • Hyperledger Composer
See all covered skills

9 reasons why
9 reasons why

Adaface Solidity Coding Test is the most accurate way to shortlist Blockchain Developers

Reason #1

Tests for on-the-job skills

The Solidity Coding 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.

The Adaface Solidity Coding Online Test screens candidates for the typical skills recruiters look for Solidity Developer roles:

  • Experience in Blockchain development
  • Experience in developing complex applications
  • Experience in developing decentralized applications
  • Understanding of the engineering principles of developing robust applications, practical application of methodologies, algorithms
  • Knowledge of financial markets and derivatives

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for Solidity Developer roles. Anti-cheating features enable you to be comfortable with conducting assessments online. The Solidity Coding Online Test is ideal for helping recruiters identify which candidates have the skills to do well on the job.

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.

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.

These are just a small sample from our library of 10,000+ questions. The actual questions on this Solidity Test will be non-googleable.

🧐 Question


Fallback functions
Review the following Solidity code:
We want to add a fallback function to the contract. Pick the correct fallback function and correct statements:
E: Fallback function is executed if contract receives plain Ether without any data
F: Fallback function is executed if caller calls a function that is not available
G: If multiple unnamed functions are defined for a contract, the cheapest function is used as fallback function


Private and Internal
Review the following Solidity code:
Pick the correct statements:

A: private increment function defined in contract_e is accessible in derived contract d_c but not accessible outside the derived contracts.
B: private increment function defined in contract_e is accessible only inside contract_e and not accessible to derived contracts as well.
C: internal variable str defined in contract_e is accessible in derived contract d_b but not outside the derived contracts.
D: internal variable str defined in contract_e is accessible only inside contract_e and not accessible to derived contracts as well.
🧐 Question🔧 Skill


Fallback functions
3 mins


Private and Internal
2 mins
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Fallback functions
Medium3 mins
Private and Internal
Easy2 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 Solidity 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.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Solidity 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

About Solidity Developer Roles

Solidity is an object-oriented programming language that may be used to create smart contracts. It is used to build smart contracts on several blockchain systems, the most prominent of which being Ethereum.

A Solidity Developer creates and deploys smart contracts for Ethereum-based systems using the object-oriented Solidity language.

Typical Solidity Developer responsibilities include:

  • Designing and developing Solidity and Cairo Smart Contracts
  • Designing and managing architecture of smart-contracts ecosystem
  • Integrating internal and 3rd-party services

What roles can I use the Solidity Test for?

  • Blockchain Developer
  • Blockchain Engineer

What topics are covered in the Solidity Coding Test?

Ethereum Smart Contract
Statically Typed Language
State Variables
Local Variables
Variable Visibilities
Data Types
Nested Mapping
EVM Bytecode
Contract Inheritance
Memory Locations
Address Payable
ERC20 Tokens

Used to enable experimental features not yet enabled in standard Solidity

ABIEncoderV2 Pragma Statement
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


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.

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
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser

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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