ArtofBlockchain

Difficulty - Medium

Total Plays - 1,565

Allowed Time - 10 sec

Best time - 1.736 sec

Which pattern most directly reduces reentrancy risk on external transfers?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
The Checks-Effects-Interactions (CEI) pattern reduces reentrancy by making you validate inputs and update internal state before any external call (like ETH transfer or token transfer). If a malicious contract re-enters, state has already moved forward, limiting exploitability. Many interviewers treat CEI as a must-know Solidity security habit for production contracts

Leaderboard
Difficulty - Medium

Total Plays - 1,563

Allowed Time - 10 sec

Best time - 6.708 sec

In EVM, which opcode can silently fail and return a boolean instead of reverting?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
Low-level CALL (and friends like DELEGATECALL) returns a success flag rather than automatically bubbling a revert. If you don’t check that boolean (or decode return data properly), your contract may continue in a “success-looking” state while the external call actually failed. This is a classic Solidity audit finding tied to unsafe external interactions.

Leaderboard
Wasim Choudhary
@K9QfAg6 • Apr 12, 2026

Apr 12, 2026

196

ZKP developer q/a

Any ZKP developers here? I’m seriously considering moving into Zero-Knowledge Proof development and would like to understand the real path to becoming one — beyond tutorials and surface-level guides. I’m...

Like 4 Replies 4
SmartChainSmith
@SmartChainSmith • Apr 28, 2026

Apr 28, 2026

206

Bay Area smart contract dev relocation: relocation to US for blockchain roles realistic timeline — what did yours look like?

I’m planning Bay Area relocation for a smart contract developer role and I need a realistic answer on the relocation timeline to the US when visa sponsorship and hiring cycles...

Like 6 Replies 4
Difficulty - Medium

Total Plays - 1,584

Allowed Time - 10 sec

Best time - --

Which audit signal indicates poor threat modeling?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
A happy-path-only focus is a strong signal of poor threat modeling in blockchain security because it ignores attacker behavior, edge cases, and abuse scenarios. Strong smart contract audit readiness requires adversarial thinking, not just normal-flow testing.

Leaderboard
Difficulty - Medium

Total Plays - 1,573

Allowed Time - 10 sec

Best time - --

Which audit issue is most often downgraded incorrectly?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
Front-running is often downgraded incorrectly in smart contract audits because teams underestimate MEV and mempool-based exploitability. In DeFi security, transaction ordering attacks can cause repeated economic loss even without a classic code exploit.

Leaderboard
Difficulty - Medium

Total Plays - 1,570

Allowed Time - 10 sec

Best time - --

Which finding has highest real-world exploit probability?

Tip: Click "Play" to reveal options and start playing.

#A

#B

#C

#D

Explanation:
Access control bugs often have the highest real-world exploit probability in smart contracts because attackers can directly call privileged functions when role checks fail. In blockchain security audits, broken authorization logic is a common cause of fund loss and protocol takeover.

Leaderboard
Shubhada Pande
@ShubhadaJP • May 17, 2026

May 17, 2026

2.4K

Web3 CV Review for Candidates Whose Proof Is Not Converting Into Interviews

This page is for Web3 candidates whose CV is truthful but still not converting into interviews. The issue may not be lack of experience. It may be that your CV,...

Like 6 Replies 2
Wasim Choudhary
@K9QfAg6 • Feb 23, 2026

Feb 23, 2026

147

ERC4337 enabling AA for Ethereum

Just Created a Education Doucmention, actually let me rephrase, a Architectural dissection for ERC4337 enabling AA(Account Abstraction) for Ethereum, and No worries Native Zksync AA soon! Every Topic presents with...

Like 2 Replies 2
ChainMentorNaina
@ChainMentorNaina • Feb 26, 2026

Feb 26, 2026

145

US Remote Solidity Take-Home Assignment: Gas Optimization vs Clean Code — Do Interviewers Actually Grade SSTORE/SLOAD and Foundry Tests?

I’m interviewing for US remote Solidity roles and keep getting a Solidity take-home assignment instead of a live coding round. The part I’m stuck on isn’t “can I finish it”...

Like 2 Replies 3
FintechLee
@FintechLee • Mar 5, 2026

Mar 5, 2026

190

Rust Protocol Engineer Proof (US Hours): Benchmarks, Flamegraphs, and PR Narratives That Hiring Teams Believe

I’m applying to Rust protocol engineer roles that work in US overlap hours, and I’ve realized generic claims like “improved performance” don’t help much unless the proof is easy to...

Like 4 Replies 3
AuditWardenRashid
@AuditWarden • Apr 18, 2026

Apr 18, 2026

200

Singapore smart contract security jobs, audit firms vs in house security and what portfolio proof wins interviews

I’m a mid level smart contract security engineer evaluating Singapore smart contract security jobs, and I’m trying to decide whether to target audit firms or in house security teams without...

Like 6 Replies 5
Merrythetechie
@Merrythetechie • Feb 23, 2026

Feb 23, 2026

182

Singapore Rust jobs in Web3: which teams actually hire Rust (L1/L2/infrastructure) — and how do they screen?

I’m exploring Rust jobs in Singapore and I’m trying to map the real market (not just “Rust preferred” in a JD). In Web3, who actually hires Rust engineers here —...

Like 7 Replies 4
Otto L
@Otto • Apr 20, 2026

Apr 20, 2026

226

USDC payroll for remote Web3 jobs (US): employee payroll vs contractor agreement vs EOR setup — contract clauses to lock before signing

I’m in late-stage interviews for a US-based Web3 role (remote), and the last mile is getting stuck on “how I’ll be paid.” The team is open to a few structures:...

Like 5 Replies 5
SmartContractGuru
@SmartContractGuru • Feb 18, 2026

Feb 18, 2026

2.4K

US DeFi Solidity interviews: how to explain external call risks without sounding textbook (reentrancy, reverts, gas griefing)

In a recent US DeFi team Solidity interview (remote loop), I got asked: “What are the risks of making an external call in a smart contract, and how would you...

Like 6 Replies 5
Akemi R
@snappy-bullet • May 14, 2026

May 14, 2026

1.9K

Security PM Interview Questions: Do Bug Bounty Write-Ups or Audit Artifacts Matter More?

I’m preparing for Security PM interviews with US Web3 teams, and I keep getting stuck on one practical question: when I talk about bug bounty work or audit-related work, what...

Like 5 Replies 7
SmartContractGuru
@SmartContractGuru • Feb 22, 2026

Feb 22, 2026

174

Singapore Web3 teams: what QA proof do you trust before shipping a proxy upgrade?

I’m testing an upgradeable Solidity system (proxy pattern) and I’m realizing “tests passing” doesn’t automatically mean the upgrade is safe. The scary part is that upgrade failures can look fine...

Like 3 Replies 3
Hayley Woodhouse
@ouyKkIN • May 21, 2026

May 21, 2026

3.3K

How to start a career in blockchain forensics at a US startup (remote Web3 jobs) — scams, wallet tracing, and compliance investigations

Hi everyone, I have a background in cybersecurity (mostly penetration testing), and I’m currently pursuing a master’s with a concentration in blockchain security. Alongside that, I’m working with a blockchain...

Like 8 Replies 11
Shubhada Pande
@ShubhadaJP • May 14, 2026

May 14, 2026

2.0K

Smart Contract QA Testing Hub: Flaky Tests, Coverage Drift, Gas Validation, and Interview Signals

Smart contract QA testing is not generic software testing with blockchain vocabulary added on top. In Web3, QA means validating contract behavior under irreversible execution, state changes, privilege boundaries, gas...

Like 6 Replies 2
ChainPenLilly
@ChainPenLilly • Feb 19, 2026

Feb 19, 2026

1.5K

US Web3 offer background checks — what tends to go wrong at the last step? (DeFi / Solidity)

I’m in late-stage interviews for a DeFi-focused Solidity developer role with a US-based team (remote). They’ve been clear that the offer will be contingent on a standard background check plus...

Like 3 Replies 4