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Blockchain Developer Test

The Blockchain Test is preferred by recruiters to assess on-the-job skills of candidates before an interview. It reduces technical screening time by 80% by enabling employers to identify qualified candidates.

Covered Skills:

  • Participant Roles
  • Validation
  • Chain code
  • Hyperledger Composer
  • Ethereum Mining
  • Ethereum- geth
  • EVM
  • Ethereum Application
  • Ethereum- Smart contract
  • Blockchain – Mining

Adaface Blockchain Test is trusted by enterprises worldwide

Amazon Morgan Stanley Vodafone United Nations HCL PayPal Bosch WeWork Optimum Solutions Deloitte Microsoft NCS Doubtnut Sokrati J&T Express Capegemini

Sample Blockchain Developer Online Test Questions

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

🧐 Question🔧 Skill💪 Difficulty⌛ Time
51% Attacks
A 51% attack is perhaps the most discussed threat to any public Blockchain asset. A 51% attack happens when a certain miner or mining pool, that owns more than 50% of all the network’s hashing power, acts maliciously to disturb the network’s operation.
For example: Two Bitcoin Cash mining pools, carried out a 51% attack on the Bitcoin Cash blockchain in order to stop an unknown miner from taking coins that they weren’t supposed to have access to, while the network forked.
Which of the following CAN be done by a miner employing a 51% attack?

A: Double spend their coins
B: Reverse confirmed transactions
C: Steal funds from a certain address
D: Prevent transactions from being confirmed
E: Create false transactions that never happened

Options:

  • A B
  • A C
  • A D
  • A E
  • B C
  • B D
  • B E
  • C D
  • C E
  • D E
  • A
  • B
  • C
  • D
  • E
BlockchainMedium3 min
Evidence
Breed Chasing, solo engineer is planning to create new cryptocurrency, NEWCRAIGLIST and build a blockchain that facilitates buying and selling second-hand items with NEWCRAIGLIST from each other. Breed expects the platform to be used for international transactions and devised the following process:

- Before a transaction is considered complete, the purchaser must put the funds in an escrow service
- The sender must enter the courier tracking number into that same escrow
Palmart, toy store giant in US is asked by lawmakers to provide evidence that proves the store’s toys are not produced through child labour. Palmart’s toys are transferred between 7 parties between creation and placement at the store. Palmart is considering using blockchain to solve this problem. Discretion in the reading and writing of transactions is highly important to the store chain to protect its proprietary interests. Review the following possible solutions and pick the best approach that solves Palmart’s problem:
Option A:
Use a public blockchain that supports assets.
Then create a new toy asset for each item created.
When the toy is transferred to the next party, mandate that the associated blockchain asset to be transferred to the next party's blockchain account with required metadata.
Lawmakers can now view transactions and transfers at any time.

Option B:
Use a permissioned blockchain.
Require that every party involved in the process to host a node on the Palmart's network.
Create a new toy asset for each item created.
When the toy is transferred to the next party in the process, have the previous party use a web portal to initialize a chain code Smart Contract to transfer control of the asset.
When the next party receives the asset have them use a web portal to initialize a chain code Smart Contracts to acknowledge receipt of the asset.
Provide read-only permissions to the lawmakers so they can receive the evidence they are looking for.

Options:

  • A
  • B
  • A B
  • Neither A nor B
BlockchainMedium3 min

How to use the Adaface Blockchain Developer Online Test

Start screening candidates within minutes with the ready-to-go Blockchain Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

Customize the Adaface Blockchain Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

About the Adaface Blockchain Developer Assessment Test

Evaluate technical and coding skills with Adaface skills assessment platform powered by an intelligent chatbot.

Topics:

Participant Roles
Validation
Chain code
Hyperledger Composer
Ethereum Mining
Ethereum- geth
EVM
Ethereum Application
Ethereum- Smart contract
Blockchain – Mining

Recommended Roles:

Blockchain Developer
Blockchain Engineer

How is this Blockchain Developer Test customized?

1
2
3

FAQs

What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • 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?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) 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 a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

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.

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.


Human Resources Manager

Singapore Government

85%
reduction in screening time

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.

OLD WAY

TRADITIONAL TESTS

Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments

😞
HIRE IN
Weeks/Months

NEW WAY

ADAFACE ASSESSMENTS

Questions for on-the-job skills

Conversational

Customized
assessments

😀️
HIRE IN
Days

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

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