11 Blockchain Developer Internship Interview Questions

I appeared for 7 Blockchain Developer Internship Interviews before bagging one.

Here are the '11 common Questions along with Answers' that I faced ⬇

1) What is a Blockchain?

Blockchain is a decentralized database.

It helps in recording transactions and tracking assets in a network.

It is described as an unchangeable data storage that is:

trustless.
decentralized.
peer-to-peer.

Here's an in-depth understanding -

twitter.com/KhanAbbas201/status/14871060018..

2) What are the different types of Blockchains?

There are 4 primary types of Blockchains namely:

Private
Public
Hybrid
Consortium blockchains.

You can refer to my thread for more depth 👇

twitter.com/PankajJagtapp/status/1488548390..

3) What is Ethereum?

Ethereum is a technology that works as digital money and a platform upon which applications can be built.

You can deploy smart contracts on Ethereum which helps in all these advancements.

Amazingly well written here -

twitter.com/iam_preethi/status/145264450379..

4) What are smart contracts?

Smart contracts are a set of rules written in code that execute when a particular condition is met.

They are automated and get executed without any third-party involvement.

Smart Contracts were first started with Ethereum Blockchain.

5) Can you write smart contracts with Bitcoin?

No, we can’t write smart contracts with Bitcoin.

The scripts feature in Bitcoin led to the development of smart contracts with Ethereum.

It can be used to put conditions while sending $BTC.

6) What are other ecosystems like Ethereum?

The most popular alternatives of Ethereum are Solana, PolkaDot and Cardano.

They are faster and more efficient than Ethereum but have fewer contributors at the moment.

7) What programming language are Smart Contracts written in?

Smart contracts for Ethereum are written in Solidity language.

For Solana, they are written in Rust programming language.

Learn more about Solidity by the legend, @vittostack

twitter.com/VittoStack/status/1493257284763..

8) Do you know what Nodes are?

A blockchain consists of numerous blocks of data.

These blocks of data are stored on Nodes.

The nodes are connected to each other, continuously exchanging updated information about the blockchain.

This ensures all nodes are updated.

About Nodes, this is the best -

twitter.com/aelfblockchain/status/135141157..

9) Do you know what is a Consensus Algorithm? Name a couple of them.

Consensus means General Agreement.

Thus, a Consensus Algorithm is a method of bringing the nodes of a blockchain in agreement with each other.

This ensures the correct updated state of blockchain is with all the nodes in the network.

Proof-of Work and Proof of Stake are consensus algorithms.

More on 'Proof of Work' by the GOAT @oliverjumpertz

twitter.com/oliverjumpertz/status/138486676..

10) How does Proof of Work work?

Proof of Work is the consensus algorithm used by Bitcoin.

It ensures how nodes can add a block to the blockchain.

This can be done only after doing a large amount of computational work to prove that it's valid.

More by John Cantrell

twitter.com/JohnCantrell97/status/148023361..

11) Finally, what are the disadvantages of Blockchain?

Blockchains have high implementations costs for companies.
Also, some blockchains are highly energy-consuming.
This leads to a negative environmental impact.
Scalability is also an issue.

This superb blog post by 101blockchains is the 101 you need for this question.

101blockchains.com/disadvantages-of-blockch..