ArtofBlockchain

Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 1.736 sec

Which pattern most directly reduces reentrancy risk on external transfers?

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#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

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Difficulty - Medium

Total Plays - 11

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.

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Wasim Choudhary
@K9QfAg6 • Mar 22, 2026

Mar 22, 2026

111

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 3 Replies 3
SmartChainSmith
@SmartChainSmith • Mar 5, 2026

Mar 5, 2026

105

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 5 Replies 3
Difficulty - Medium

Total Plays - 32

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.

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Difficulty - Medium

Total Plays - 22

Allowed Time - 10 sec

Best time - --

Which audit issue is most often downgraded incorrectly?

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#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.

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Difficulty - Medium

Total Plays - 19

Allowed Time - 10 sec

Best time - --

Which finding has highest real-world exploit probability?

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#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.

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Shubhada Pande
@ShubhadaJP • Mar 27, 2026

Mar 27, 2026

460

Web3 CV Review Services Are Now Open on ArtOfBlockchain.club

Many AOB members have reached out over time asking for CV feedback before applying to Web3 roles. To keep this support high-quality, focused, and sustainable, I’m now handling personalized CV...

Like 4 Replies 1
Wasim Choudhary
@K9QfAg6 • Feb 23, 2026

Feb 23, 2026

93

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

87

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”...

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10 days left

C

Smart Contract Engineer — Solidity (EVM, Foundry, Hardhat)

Category Labs • Full Time

Remote · New York Posted: Feb 22, 2026

Job description

Category Labs (formerly Monad Labs) is building high-performance infrastructure around an optimized EVM client designed to improve blockchain throughput without sacrificing portability. This position sits within web3 smart contract roles focused on application-layer engineering over a next-generation EVM implementation. As a Smart Contract Engineer, you will design and implement Solidity...

Details Login to apply
FintechLee
@FintechLee • Mar 5, 2026

Mar 5, 2026

121

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 • Mar 19, 2026

Mar 19, 2026

117

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...

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Merrythetechie
@Merrythetechie • Feb 23, 2026

Feb 23, 2026

116

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 • Mar 29, 2026

Mar 29, 2026

128

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 4 Replies 4
SmartContractGuru
@SmartContractGuru • Feb 18, 2026

Feb 18, 2026

2.3K

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...

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Akemi R
@snappy-bullet • Mar 20, 2026

Mar 20, 2026

442

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

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

Like 4 Replies 5
SmartContractGuru
@SmartContractGuru • Feb 22, 2026

Feb 22, 2026

106

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 • Mar 22, 2026

Mar 22, 2026

1.8K

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 6 Replies 9
Shubhada Pande
@ShubhadaJP • Mar 28, 2026

Mar 28, 2026

490

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 5 Replies 2