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Application deadline: 3 days

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Web3 Blockchain Engineer – ERC-4626 Vault Router

Token Metrics • FULL_TIME • NA

Job description

Token Metrics builds crypto-focused analytics and infrastructure products used by investors and portfolio managers across global markets. This contract role sits within the engineering team and focuses on developing EVM-based smart contract infrastructure, including work related to ERC-4626 vault routing. As a Web3 Blockchain Engineer, you will collaborate closely with...

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Application deadline: 3 days

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Smart Contract Engineer

Paxos Labs • FULL_TIME • NA

Job description

Paxos Labs builds enterprise-grade onchain infrastructure used by large financial organizations to support transparent and verifiable digital asset products. The Smart Contract Engineer role sits within the engineering organization and focuses on scaling the company’s DeFi protocol infrastructure. The position involves researching, designing, and implementing core protocol mechanisms across areas...

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Application deadline: 3 days

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Smart Contract Engineer

Category Labs (formerly Monad Labs) • FULL_TIME • NA

Job description

Category Labs is a systems engineering and research team building high-performance decentralized infrastructure. The company focuses on application-layer primitives enabled by a custom, high-throughput EVM client. As a Smart Contract Engineer, you will work within the core engineering group to design and implement smart contracts aligned with the performance characteristics...

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Shubhada Pande

@ShubhadaJP • 1mo

Smart Contract Fundamentals in Blockchain: EVM Basics, Solidity Concepts, Tooling & Core Mental Models

Strong smart contract engineers are not defined by how fast they jump into DeFi or audits — they are defined by how well they understand first principles.This hub exists to...

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abushaker jamil

@hRZ80yi • 1mo

Looking for Guidance in My Blockchain Journey --- How Do I Get My First Full-Time Blockchain Developer Role?

I’ve been learning blockchain for about 1.5 years, and it has become something I’m truly passionate about. Even though I don’t come from a traditional tech background. I completed a...

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Shubhada Pande

@ShubhadaJP • 1mo

Blockchain QA & Smart Contract Testing Hub (Coverage, Flaky Tests, Gas + Proof)

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Difficulty - Medium

Total Plays - 16

Allowed Time - 10 sec

Best time - 1.367 sec

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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Aditi R

@aGoKU4J • 1mo

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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Difficulty - Medium

Total Plays - 16

Allowed Time - 10 sec

Best time - 3.221 sec

Which opcode returns remaining gas?

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

#A

#B

#C

#D

Explanation:
GASLEFT returns the amount of gas remaining in the current execution context. It is commonly used for gas-aware logic and debugging.

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Difficulty - Medium

Total Plays - 16

Allowed Time - 10 sec

Best time - 3.422 sec

Which type consumes exactly one storage slot regardless of value?

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#A

#B

#C

#D

Explanation:
bytes32 always occupies a full 32-byte storage slot. Smaller types may be packed together, but bytes32 always stands alone.

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Shubhada Pande

@ShubhadaJP • 1mo

Proof-Based Hiring in Web3 Hub (Hiring Signals, JD Proof Lines, Shortlist Loops)

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Difficulty - Medium

Total Plays - 12

Allowed Time - 10 sec

Best time - 2.477 sec

Why does storage write order matter for structs?

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#A

#B

#C

#D

Explanation:
Solidity packs struct variables tightly into storage slots based on declaration order. Reordering fields can change slot boundaries and break upgrade compatibility.

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Shubhada Pande

@ShubhadaJP • 1mo

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 - 10

Allowed Time - 10 sec

Best time - 0.784 sec

What determines the base slot of a mapping?

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#A

#B

#C

#D

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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CryptoSagePriya

@CryptoSagePriya • 1mo

I’m starting my first smart contract job next week and I’m honestly nervous — what actually matters during probation?

I’m starting my first smart contract job next week and honestly I’m nervous.Everyone keeps saying “probation decides everything” but no one really explains how.Some people say move fast. Some say...

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