7-Day Blockchain Interview Preparation Plan
Your saved questions plus a day-by-day plan. Add questions with Save to → 7-Day Job Prep on any question page.
Day-by-day plan
Day 1Fundamentals and cryptography
- Revise blocks, hashing, Merkle trees and UTXO versus account model
- Explain public and private keys, signatures and address derivation aloud
- Answer 15 fundamentals questions from this page
- Review consortium chains and when not to use blockchain
Day 2Consensus and scaling
- Compare PoW, PoS, PoA and BFT with trade-offs
- Revise slashing, finality and 51 percent attacks
- Study optimistic versus zk-rollups and EIP-4844 blobs
- Draw a diagram of how a Layer 2 posts data to Ethereum
Day 3Ethereum and the EVM
- Revise gas, EIP-1559 and the transaction lifecycle
- Practise call, delegatecall, CREATE2 and storage layout questions
- Use cast to compute selectors and read storage slots
- Review account abstraction with ERC-4337 and EIP-7702
Day 4Solidity coding
- Write an ERC-20, an escrow and a voting contract from memory
- Revise visibility, modifiers, errors and inheritance rules
- Write Foundry unit and fuzz tests for one contract
- Practise gas optimisation and storage packing questions
Day 5Security
- Write vulnerable and fixed reentrancy examples
- Revise oracle manipulation, front-running and access control bugs
- Run Slither on a sample project and triage findings
- Read one recent exploit post-mortem and summarise it
Day 6DeFi and dApps
- Calculate an AMM swap output, impermanent loss and a health factor
- Build a small front-end that connects a wallet and calls a contract
- Revise IPFS, oracles and event indexing
- Practise scenario questions on onboarding and RPC failures
Day 7Mock interview and HR
- Do a timed mock interview covering concepts, coding and a scenario
- Prepare STAR stories for a bug, a deadline and a conflict
- Polish your project walkthrough with GitHub links and testnet addresses
- Revise the 30 key points on this page
Frequently asked questions
Can I prepare for a Blockchain interview in 7 days?
Seven days is enough to revise and sharpen, not to learn from zero. Use the plan to cover each core topic once, practise questions daily and finish with a mock interview.
How do I add questions to the plan?
On any question page choose Save to → 7-Day Job Prep. Saved questions show up at the top of this page.
How many hours a day should I study?
Two to four focused hours a day works for most people: one hour of revision, one to two hours of questions, and the rest on projects or mock answers.
Questions to practise each day
Company-wise Blockchain questionsExperience-wise Blockchain questionsRole-wise Blockchain questionsCity-wise Blockchain questionsMost asked Blockchain questionsScenario-based questionsPractical / hands-on questionsHR & behavioural questionsBlockchain mock interviewOnline assessment questionsTechnical round questionsManagerial round questionsBlockchain topic sheets