AI-powered Blockchain Developer mock interviews

Can you explain the difference between gas limit and gas price in Ethereum smart contracts and how they impact the execution of transactions?

How would you handle reentrancy attacks in smart contracts and what are the best practices to prevent such vulnerabilities?

How does the consensus mechanism in a Blockchain network impact the scalability and security of the system? Can you provide examples of different consensus algorithms and their trade-offs?

Can you explain the concept of Merkle Trees and how they are used in Blockchain architecture?

Explain the concept of perfect forward secrecy in cryptographic protocols and provide an example of a protocol that implements this feature.

Discuss the differences between symmetric and asymmetric encryption algorithms, and explain a scenario where you would choose one over the other for secure communication.

Can you explain the differences between Practical Byzantine Fault Tolerance (PBFT) and Proof of Work (PoW) consensus algorithms? How do they address the issues of scalability and energy consumption differently?

In the context of distributed consensus algorithms, what are the key characteristics of the Raft consensus algorithm that differentiate it from Paxos? How does Raft handle leader election and log replication to ensure fault tolerance?

Can you explain the difference between on-chain and off-chain transactions in the context of DApp development?

How would you design a secure smart contract architecture to prevent common vulnerabilities such as reentrancy and integer overflow?

Can you discuss the potential security vulnerabilities associated with using 'delegatecall' in Solidity contracts and how you would mitigate these risks?

Explain the difference between 'view' and 'pure' functions in Solidity and provide an example of when you would use each.

Describe a situation where you had to communicate a complex idea to a non-technical stakeholder. How did you ensure effective communication and understanding? What strategies did you use to overcome any potential misunderstandings?

Can you provide an example of a time when you had to navigate a challenging team dynamic to successfully deliver a project? How did you approach the situation and what was the outcome?