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Shubhada Pande
@ShubhadaJP • Jun 25, 2025

Jun 25, 2025
3.7K

Quantum Computing, PQC, and the Future of Blockchain Jobs

The blockchain world is on the brink of a monumental shift, one that promises to solve its most persistent limitations while simultaneously creating a new landscape of career opportunities.For years, we've celebrated blockchain's potential for decentralization and security. Still, we've also grappled with its fundamental...

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Difficulty - Medium

Total Plays - 39

Allowed Time - 10 sec

Best time - 1.466

Which is a risk of using oracles?

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Explanation:
Centralized oracles can be a single point of failure. If they provide false data, contracts relying on them can be exploited.

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Difficulty - Medium

Total Plays - 42

Allowed Time - 10 sec

Best time - 1.573

Decentralized exchanges:

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Explanation:
Decentralized exchanges (DEXs) operate using smart contracts, which automatically execute trades without the need for intermediaries. This allows users to trade crypto directly from their wallets while maintaining control of their assets

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MakerInProgress
@MakerInProgress • May 10, 2026

May 10, 2026
2.8K

How can I transition from Web2 career to Web3 career for US startup developer roles (3 years full-stack)?

I’ve spent the last three years as a Web2 full-stack developer (React, Node, AWS) building and scaling production apps. Recently I keep searching the same thing: how can i transition...

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Abdil Hamid
@ForensicBlockSmith • Feb 13, 2026

Feb 13, 2026
1.7K

Hardhat vs Remix for beginners: when building a dApp, what should I use and why?

Hey everyone — I’m new to Ethereum development and building a small dApp (Solidity + ethers.js).I keep seeing “use Hardhat”, but I’m still unclear what Hardhat is used for in...

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AuditWardenRashid
@AuditWarden • Feb 7, 2026

Feb 7, 2026
1.7K

Blockchain Developer vs Data Scientist for Singapore (from Germany): Which path gets hired + EP pass reality in 2025?

I keep seeing people debate blockchain developer vs data scientist, so I’m putting my real situation here. I’m currently based in Germany, and I’m trying to target Singapore roles (either...

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Anita Patel
@SmartContractSensei • Apr 18, 2026

Apr 18, 2026
3.3K

Rust dev moving into Web3 — how do you answer ‘Tell me about yourself’ without sounding like a blockchain newbie?

I’m a Rust dev (backend + performance stuff) and I’m interviewing for Web3 roles now. This sounds silly, but “Tell me about yourself” is the one question where I freeze,...

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Difficulty - Medium

Total Plays - 1,617

Allowed Time - 10 sec

Best time - 0.900

Which opcode is deprecated but still callable?

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Explanation:
CALLCODE is deprecated due to unsafe context handling. It remains callable for backward compatibility but should never be used in new designs.

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AshishSingh
@Web3SecurityPro • Jun 2, 2026

Jun 2, 2026
2.5K

What skills actually matter for blockchain UI/UX design jobs in NFT platforms, decentralized identity, wallet onboarding, and metaverse products?

I keep seeing blockchain UI/UX design jobs mentioned around NFT platforms, metaverse products, decentralized identity apps, crypto wallets, and Web3 communities, but I am not sure what hiring teams actually...

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Smita Geaorge
@SmartChainSmith • Jul 13, 2026

Jul 13, 2026
2.0K

DevOps to Blockchain: Do Web3 Teams Actually Hire Infra Engineers or Is It a Dead End?

I’ve been working in DevOps for about 5 years, particularly in CI/CD pipelines, cloud infrastructure, automation, reliability work, the usual stuff. Lately, I keep seeing more talk around blockchain and...

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Difficulty - Medium

Total Plays - 22

Allowed Time - 10 sec

Best time - 1.062

Why avoid multiple SSTOREs in a function?

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Explanation:
SSTORE is one of the most expensive operations and repeating it unnecessarily multiplies costs. Caching values into memory and writing once dramatically optimizes gas. This is foundational in gas-sensitive protocols.

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Olivia Smith
@SmartOlivia • Jun 8, 2026

Jun 8, 2026
2.8K

How to Explain Smart Contract Debugging in Solidity Developer Interviews

I’m preparing for Solidity developer interviews, and one question keeps tripping me up: “How do you debug smart contracts?” In Web2, debugging feels more predictable — logs, breakpoints, stack traces.In...

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Arif
@ofh3VYy • Jun 29, 2026

Jun 29, 2026
923

What should I study next to become smart contract auditor

I know the MERN stack and have already built a few Solidity-based projects like crowdfunding and lottery apps. I now want to become a smart contract auditor and eventually earn...

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Difficulty - Medium

Total Plays - 47

Allowed Time - 10 sec

Best time - 0.758

Which hash function does Bitcoin use?

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Explanation:
Bitcoin uses the SHA-256 cryptographic hash function to secure transactions and link blocks in the blockchain. This algorithm produces a fixed 256-bit output, ensuring immutability and resistance to tampering. By using SHA-256, Bitcoin maintains trust, decentralization, and data integrity across the network

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Difficulty - Medium

Total Plays - 39

Allowed Time - 10 sec

Best time - 0.959

What does zk-SNARK stand for?

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Explanation:
zk-SNARKs are zero-knowledge proofs that improve blockchain privacy and scaling by verifying transactions without revealing sensitive data.

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Difficulty - Medium

Total Plays - 32

Allowed Time - 10 sec

Best time - 1.388

What is the purpose of the #[account] macro in Anchor?

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Explanation:
The #[account] macro in Anchor is used to define and validate account structures for Solana smart contracts. It simplifies account management and ensures data integrity.

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Difficulty - Medium

Total Plays - 27

Allowed Time - 10 sec

Best time - 2.943

Which Rust feature ensures type safety in blockchain data structures?

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Explanation:
Rust’s ownership model enforces strict rules on data access, preventing issues like double-spending in blockchain applications. It ensures compile-time safety for complex data structures.

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Difficulty - Medium

Total Plays - 30

Allowed Time - 10 sec

Best time - 1.424

Which platform focuses on NFT-based games?

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Explanation:
Decentraland is a virtual world where users buy land and items as NFTs. It blends gaming and digital ownership.

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Difficulty - Medium

Total Plays - 30

Allowed Time - 10 sec

Best time - 1.157

MetaMask" is a

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Explanation:
MetaMask is a popular cryptocurrency wallet and browser extension that allows users to manage Ethereum-based assets and interact with decentralized applications (dApps). It securely stores private keys, enabling seamless transactions and access to Web3 platforms directly from the browser.

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Difficulty - Medium

Total Plays - 47

Allowed Time - 10 sec

Best time - 1.211

Blockchain Oracles provide

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Explanation:
A blockchain oracle is a service that connects a blockchain with real-world data from outside the network. It helps smart contracts get information like weather, prices, or sports scores so they can work properly.

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