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Victor P
@TrG6JIR • Jan 17, 2026

Jan 17, 2026

499

My Smart Contract Auditor Portfolio Got Rejected—What Do Firms Actually Want to See?

I just got rejected for a smart contract auditor role, and the feedback honestly shook me. They said my audit portfolio felt “too academic” and “not reflective of real protocol...

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Abdil Hamid
@ForensicBlockSmith • Jan 10, 2026

Jan 10, 2026

1.5K

How Would You Actually Reduce NFT Minting Costs in Production — Not Just on Paper? (Interview Perspective)

I’m preparing for a blockchain interview and got asked a version of this question:“How would you reduce NFT minting costs on Ethereum in a real production setup?”I understand the basics...

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Shubhada Pande
@ShubhadaJP • Jan 6, 2026

Jan 6, 2026

286

How to Debug Solidity Smart Contracts: Hardhat, Testnets, Flaky Tests & Production Failures

Debugging Solidity smart contracts is one of the hardest skills to master in Web3 — and one of the most frequently tested in real interviews and on-the-job scenarios.Most smart contract...

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Aditi R
@aGoKU4J • Jan 2, 2026

Jan 2, 2026

4.0K

How Do I Switch From UI/UX Design to a Blockchain or Web3 Career?

Has anyone here transitioned from regular UI/UX design into blockchain or Web3? I have three years of experience working on SaaS and web apps, but now I am curious about...

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Shubhada Pande
@ShubhadaJP • Jan 2, 2026

Jan 2, 2026

200

Zero-Knowledge Proofs & Cryptography Hub: Understanding ZK Systems, Privacy Engineering & Real-World Protocol Design

Zero-knowledge proofs (ZKPs) are no longer just academic cryptography. They now power real systems — from rollups and privacy chains to identity layers, proof-of-reserves, and scalable computation.This hub brings together...

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Difficulty - Medium

Total Plays - 13

Allowed Time - 10 sec

Best time - 0.784

What determines the base slot of a mapping?

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Explanation:
The base slot of a mapping is derived using keccak256(key . slot). This hashing ensures unique storage locations per key without collisions.

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Aditi R
@aGoKU4J • Dec 28, 2025

Dec 28, 2025

281

Clean code, but still rejected — what do juniors miss in take-home assignments?

I’m a junior developer and I keep running into the same problem. My take-home assignments usually work, the code is clean, but I still get rejected — often without any...

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Difficulty - Medium

Total Plays - 15

Allowed Time - 10 sec

Best time - 3.845

Which function type cannot access msg.sender?

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Explanation:
pure functions cannot read blockchain context such as msg.sender or block.timestamp. They are restricted to computation based solely on input parameters and local variables

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AuditWardenRashid
@AuditWarden • Dec 18, 2025

Dec 18, 2025

1.4K

How do real smart contract audits work in practice? What do auditors actually check first?

I’m trying to understand how smart contract audits work in real life — not the generic “run a few tools and look for reentrancy” advice we see online, but the...

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Shubhada Pande
@ShubhadaJP • Dec 14, 2025

Dec 14, 2025

217

Web3 Hiring Signals

Your curated hub for understanding how Web3 teams actually evaluate talent — beyond resumes, GitHub stars, and surface-level interviews.This page organizes AOB discussions and articles that help founders, hiring managers,...

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Difficulty - Medium

Total Plays - 12

Allowed Time - 10 sec

Best time - 1.493

Why are fallback functions dangerous?

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Explanation:
Fallback functions run automatically when unknown calls or plain ETH are sent. If they contain external calls or heavy logic, attackers can trigger recursion or re-entrancy. They must be kept minimal and safe.

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AuditWardenRashid
@AuditWarden • Dec 8, 2025

Dec 8, 2025

475

How do you negotiate salary with early-stage blockchain startups when cash + tokens + equity are mixed?

I’m struggling with compensation discussions at early-stage blockchain startups because the moment tokens enter the conversation, everything becomes unclear. I have three years of developer experience, but I still can’t...

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Fady Efat
@hACjMzw • Dec 5, 2025

Dec 5, 2025

281

Guidance on Next Steps for Web3 Development Career

Hi everyone,I’ve developed 2 projects on the Spoilya network using Flutter:A one-time voting app.Clicker Bee mobile game with NFTs.and 1 using react with helping AI ,Crypto Tracker I’m not sure...

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Difficulty - Medium

Total Plays - 7

Allowed Time - 10 sec

Best time - 10

What makes memory expansion expensive?

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Explanation:
Memory follows a quadratic cost function, meaning costs rise rapidly as the memory footprint grows. Careless array allocations can suddenly inflate execution cost. This is a frequent root cause of gas blowups in audits.

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Difficulty - Medium

Total Plays - 8

Allowed Time - 10 sec

Best time - 2.358

Why is PUSH0 useful in gas optimization?

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Explanation:
PUSH0 provides a zero literal without consuming calldata or memory. This reduces bytecode size and simplifies stack management. It's extremely helpful in tight loops and assembly-heavy contracts.

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Difficulty - Medium

Total Plays - 7

Allowed Time - 10 sec

Best time - 2.492

What does REVERT preserve that INVALID does not?

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Explanation:
REVERT allows returning structured revert data back to the caller, which improves debugging and interface guarantees. INVALID terminates execution with no return payload. This distinction is crucial for protocols relying on bubble-up error messaging.

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Difficulty - Medium

Total Plays - 7

Allowed Time - 10 sec

Best time - 10

Why are multi-step writes risky?

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Explanation:
Multi-step operations can leave the contract in a partially updated state if execution halts. Attackers exploit these interim states to bypass checks.

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Difficulty - Medium

Total Plays - 6

Allowed Time - 10 sec

Best time - 3.912

Which op is used for external code size?

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Explanation:
EXTCODESIZE checks if the target has code deployed. It helps detect contracts vs EOAs in validation logic

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Difficulty - Medium

Total Plays - 5

Allowed Time - 10 sec

Best time - 5.375

Why is SELFDESTRUCT dangerous in proxies?

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Explanation:
If the implementation contract is self-destructed, proxies break permanently or redirect unexpectedly. This creates bricked contracts and undefined behavior

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Difficulty - Medium

Total Plays - 8

Allowed Time - 10 sec

Best time - 10

What does RETURNDATASIZE prevent?

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Explanation:
RETURNDATASIZE ensures the caller knows exactly how many bytes were returned. It prevents incorrect assumptions and truncation bugs during low-level calls.

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