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CryptoSagePriya

@CryptoSagePriya • 1mo

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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Jatin R

@5EB8S0F • 1mo

Anyone here moved from regular QA to Blockchain QA? I’m trying to understand what actually changes

I’ve been working in regular QA for about six years — mostly white-box, API testing, and some automation. I’m now thinking about moving into Blockchain QA, but I can’t figure...

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Difficulty - Medium

Total Plays - 11

Allowed Time - 10 sec

Best time - 3.307 sec

Why should developers avoid using tx.origin for authentication?

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

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Explanation:
Attackers can trick users into calling a malicious contract. That contract then makes a call where tx.origin equals the victim’s address. This bypasses access control and leads to unauthorized actions.

Leaderboard
Difficulty - Medium

Total Plays - 12

Allowed Time - 10 sec

Best time - 1.493 sec

Why are fallback functions dangerous?

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

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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.

Leaderboard
Difficulty - Medium

Total Plays - 11

Allowed Time - 10 sec

Best time - 1.974 sec

Why can abi.encodePacked cause issues?

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

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Explanation:
encodePacked removes padding, which can produce identical byte sequences for different inputs. When combined with hashing, this may cause collisions. Using abi.encode is safer for multi-field data.

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SmartChainSmith

@SmartChainSmith • 1mo

Anybody dealt with a DAO where Discord is active but on-chain activity is flat?

I manage analytics for a mid-sized DAO (~12K members), and I’m running into a strange mismatch I can’t seem to solve internally. Our Discord is busier than ever — more...

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Application deadline: 4 weeks

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Senior Backend & Smart Contract Engineer (Rust/Solana)

Breeze (Anagram) • FULL_TIME • NA

Job description

Breeze is developing infrastructure that enables users to earn yield on digital assets through a non-custodial platform directly embedded into existing applications. This role centers on designing Rust-based Solana programs and maintaining backend components such as indexers, risk engines, and analytics systems. The engineer will work closely with product and...

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Application deadline: 4 weeks

Rust Backend Engineer

Svix • FULL_TIME • NA

Job description

Svix is hiring a Rust-focused Backend Engineer to help build and scale its server-to-server communication platform. The company develops high-performance message delivery infrastructure used by customers ranging from fast-growing startups to large enterprises. This role involves implementing backend services in Rust, designing systems that support high availability, and contributing to...

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Application deadline: 4 weeks

Rust-Simplicity Maintainer

Blockstream • FULL_TIME • NA

Job description

Blockstream is seeking a Rust-Simplicity Maintainer to oversee its Rust-based implementation of the Simplicity language and related libraries. The role centers on maintaining multiple interconnected crates—such as rust-simplicity, SimplicityHL, hal-simplicity, rust-elements, and elements-miniscript—ensuring they function cohesively within the broader Simplicity ecosystem. This position involves architecture, implementation, testing, and long-term maintenance...

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Miben Rogers

@YGHQ65t • 1mo

Struggling With EVM Gas Costs in Interviews — How Do SSTORE/SLOAD and Slot Packing Actually Work in Real Projects?

Yesterday’s smart contract interview was quite difficult for me. I was asked to explain SSTORE vs SLOAD gas costs, warm vs cold access, and when slot packing actually saves gas....

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Shubhada Pande

@ShubhadaJP • 1mo

A Clear Framework for Debugging Solidity Errors That Keep Reappearing in Interviews

Disclaimer: This guide covers debugging patterns commonly evaluated in Solidity interviews and early-career smart contract roles. It is not a complete security audit methodology. Different teams and advanced audit firms...

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Abdil Hamid

@ForensicBlockSmith • 1mo

I’m Moving From Finance Into Blockchain Development — What Career Mistakes Should I Avoid in My First 12 Months?

I’m shifting from forensic investigations in investment banking into blockchain development, and the transition has been more unpredictable than I expected. The technical learning curve is steep, but the career...

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Application deadline: 4 weeks

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Smart Contract Engineer

Veda • FULL_TIME • NA

Job description

This role supports Veda’s Solidity engineering organization, contributing to the architecture, reliability, and security of smart contracts that power high-TVL DeFi vaults. The position involves designing new protocol features, maintaining existing vault infrastructure, and ensuring strong security practices through threat modeling, formal verification, and audit-by-design methodologies. Engineers will work across...

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Application deadline: 4 weeks

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Solidity Compiler Frontend Engineer

CertiK • FULL_TIME • NA

Job description

This role focuses on the design and development of Solidity compiler frontend components within CertiK’s blockchain security engineering team. The position involves building and optimizing compiler infrastructure used for static analysis, semantic checks, and integration with formal verification tools. The engineer will work on parsing, AST generation, and type systems...

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Application deadline: 4 weeks

C

Blockchain Security Engineer (Solidity / Rust / Golang)

CertiK • FULL_TIME • NA

Job description

This role supports CertiK’s blockchain security engineering function, focusing on auditing decentralized systems and contributing to internal security tools. The position is designed for early-career engineers with a strong technical foundation and an interest in securing smart contracts, protocols, and blockchain infrastructure. The work involves reviewing codebases, researching potential attack...

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