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Miben Rogers
@YGHQ65t • Jan 8, 2026

Jan 8, 2026

136

Mid-career blockchain developer here — salary ranges feel unpredictable, what should I pay attention to?

I’ve been working as a blockchain developer for a few years now and have started interviewing again, but I’m struggling to make sense of compensation this time around.For similar roles,...

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Shubhada Pande
@ShubhadaJP • Jan 4, 2026

Jan 4, 2026

1.1K

Blockchain Skills That Actually Matter in 2025 (Beyond Job Titles & Courses)

Most blockchain career guides list skills. Very few explain which ones actually matter once hiring starts.Over the last few years, the blockchain job market has matured fast. Teams are no...

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Difficulty - Medium

Total Plays - 16

Allowed Time - 10 sec

Best time - 1.367

Which opcode differentiates EOAs from contracts?

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

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Explanation:
EXTCODESIZE returns zero for EOAs and non-zero for deployed contracts. This distinction is commonly used for contract detection, though it has edge cases.

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Difficulty - Medium

Total Plays - 14

Allowed Time - 10 sec

Best time - 1.638

Which data location is read-only by default?

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

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Explanation:
Calldata is immutable and cannot be modified by the callee. This makes it gas-efficient and safe for external function inputs

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Difficulty - Medium

Total Plays - 11

Allowed Time - 10 sec

Best time - 3.221

What happens to storage slots after contract self-destruct?

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

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Explanation:
Storage is not automatically wiped when a contract self-destructs. The data remains on-chain and can be accessed again if a contract is redeployed at the same address.

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AlexDeveloper
@Alexdeveloper • Dec 27, 2025

Dec 27, 2025

3.0K

I blank out in Solidity interviews — how do you prepare for code review and optimization tasks?

I’m preparing for junior smart contract developer roles, and I’m consistently struggling with the Solidity code-review part of the interview.Whenever an interviewer drops a simple staking or ERC20 contract and...

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Alex Chen
@AlexC • Dec 18, 2025

Dec 18, 2025

223

As a blockchain QA, how do you report critical bugs without damaging your relationship with developers?

I work as a QA in a blockchain project, and I’m struggling with how to report critical bugs without creating friction with developers.In Web3, even small issues can have serious...

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CryptoSagePriya
@CryptoSagePriya • Dec 10, 2025

Dec 10, 2025

346

Thinking of switching into DePIN engineering—what skills actually matter once you’re on the job?

I’ve been exploring DePIN roles because projects like Helium, Filecoin Green, IoTeX, and Hivemapper are growing fast, but I still don’t fully understand what a DePIN engineer does day-to-day.My background...

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amanda smith
@DecentralizedDev • Dec 7, 2025

Dec 7, 2025

1.5K

How do you explain to an interviewer the trade-offs of a single contract acting like both ERC-721 and ERC-1155?

I recently struggled with an interview question about designing a single NFT contract that behaves like both ERC-721 and ERC-1155. The interviewer wanted a practical explanation, not just theory, and...

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Abasi T
@ggvVaSO • Dec 5, 2025

Dec 5, 2025

433

Is my DAO governance work enough to land a Governance Analyst role, or do I need protocol experience too?

I’ve been active in a couple of DAOs over the last year—proposal writing, forum discussions, occasional voting rationales, and a bit of delegate work. It’s been meaningful work, but I...

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Sheza Henry
@ChainVisionary • Dec 4, 2025

Dec 4, 2025

485

I Have a DeFi Interview This Week — How Do I Explain Price Oracle Security Without Sounding Superficial?

I have a DeFi protocol interview later this week, and the part I’m most nervous about is oracle security. Every time I answer this in mock interviews, I feel like...

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AuditWardenRashid
@AuditWarden • Dec 3, 2025

Dec 3, 2025

2.1K

I Won Two Blockchain Hackathons but Still Don’t Feel “Job-Ready” — How Do I Actually Learn Full-Stack Web3 the Right Way?

I’m at a confusing point in my Web3 journey and I’m hoping for honest guidance from people who’ve already gone through this.I just finished my Computer Science degree, and on...

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Difficulty - Medium

Total Plays - 6

Allowed Time - 10 sec

Best time - 6.303

Why are external loops discouraged?

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

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Explanation:
Unbounded loops that depend on storage or user-controlled arrays can exhaust gas and render functions uncallable. Attackers can intentionally cause denial-of-service through loop amplification. Good design avoids external iteration

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Difficulty - Medium

Total Plays - 6

Allowed Time - 10 sec

Best time - 2.699

Why avoid comparing strings on-chain?

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

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#D

Explanation:
String comparison requires hashing or byte-by-byte checks, both of which are expensive in the EVM model. It also introduces risk when mixed with packed encodings. Developers instead rely on enums or hashed IDs.

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Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 1.846

Why is storing large arrays on-chain discouraged?

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

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Explanation:
Storage is the most expensive resource in the EVM. Large arrays result in high operational cost and poor long-term scalability.

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Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 0.675

Why is using block.timestamp in fairness-critical logic dangerous?

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

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Explanation:
Miners can adjust timestamps within a reasonable range, enabling subtle manipulation. This can affect auctions, lotteries, and reward systems

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Bondan S
@Layer1Bondan • Nov 21, 2025

Nov 21, 2025

687

Is It Safe to Accept Tokens Before Tokenomics Is Published? Developers Share What Really Happens

I’m stuck on a compensation dilemma that I know many Web3 engineers quietly face. I’ve received a Smart Contract Developer offer from an early L1 startup (India-based). The fiat salary...

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Andria Shines
@ChainSage • Nov 29, 2025

Nov 29, 2025

519

How do I craft a 60-second founder-focused pitch as a junior Solidity developer when my repos are small but real?

I’ve been trying to break into Solidity roles for three months, and founder responses confuse me more than recruiter responses. Recruiters ask for resumes, keywords, portfolios… but founders jump straight...

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Difficulty - Medium

Total Plays - 10

Allowed Time - 10 sec

Best time - 3.127

Why document invariants during audit?

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

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Explanation:
Invariants are rules that must always remain true in a contract. Documenting them helps validate whether your core logic stays consistent after every transaction.

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Sayali Bhandari
@SayaliB • Nov 8, 2025

Nov 8, 2025

1.4K

Preparing for Blockchain Voting System Interviews: Cryptography, Privacy & Consensus Insights

I’ve got an upcoming interview for a blockchain voting system project. My background is in cryptography (mostly DeFi and zk-based work), but this is my first time preparing for voting...

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