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Tushar Dubey

@DataChainTushar • 2h

Switching to Smart Contract Development — Should I Go Deep in Hardhat or Foundry First to Avoid Failing Early Technical Tests?

I’m transitioning from Web2 backend engineering into my first full-time smart-contract role, and the biggest uncertainty I’m facing is tooling. Every senior dev I ask gives a different answer —...

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WillowSyncDev

@WillowSyncDev • 2h

I’m a blockchain developer returning after a 1.5-year break — how do I explain the gap when L2 tooling and audit standards have evolved so much?

I’ve been a blockchain developer for 4 years, but I took a 1.5-year career break due to personal reasons and some freelance experiments that never really scaled. Now that I’m...

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Application deadline: 4 weeks

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Engineering Manager, Payments

Polygon Labs • FULL_TIME • NA

Job description

Polygon Labs builds aggregation-based blockchain infrastructure via the Agglayer and contributes to core scaling technologies such as Polygon PoS, Katana, and developer frameworks. The Engineering Manager, Payments role leads the development of a global fintech stack supporting digital payments, wallet infrastructure, compliance pipelines, currency conversions, and on/off ramp experiences. This...

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Application deadline: 4 weeks

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On-Chain Treasury & Liquidity Analyst

Polygon Labs • FULL_TIME • NA

Job description

Polygon Labs develops aggregation-based blockchain infrastructure via the Agglayer, enabling interoperability and shared liquidity between connected chains using Ethereum as a settlement layer. The On-Chain Treasury & Liquidity Analyst is responsible for managing Polygon Labs’ on-chain balance sheet, deploying capital across DeFi venues, maintaining hedged currency exposure, and overseeing multi-asset...

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Application deadline: 4 weeks

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Lead QE / SDET

Trust Wallet • FULL_TIME • NA

Job description

This role leads the Quality Engineering function for Trust Wallet’s ecosystem of applications across Android, iOS, browser extension, and web. The position is responsible for defining the automation roadmap, modernizing the existing test infrastructure, and guiding the technical evolution of the testing framework from Appium + Java toward a unified...

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Application deadline: 4 weeks

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Backend Golang Developer

Trust Wallet • FULL_TIME • NA

Job description

Trust Wallet is a large-scale non-custodial wallet supporting more than 10 million digital assets and over 100 blockchains. As a Go Backend Engineer, you will develop backend systems that support a multi-chain user experience across desktop, mobile, and browser extension applications. The role involves building microservice-driven systems, defining backend service...

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Difficulty - Medium

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What makes nested delegatecalls dangerous?

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Explanation:
Each delegatecall runs in the caller’s storage space, so nesting them multiplies the chances of overwriting incorrect slots. This breaks upgradeability guarantees and corrupts state. Auditors treat deep delegatecall chains as red flags.

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Difficulty - Medium

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Why do upgradeable contracts avoid constructors?

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Explanation:
Constructors run only during deployment and do not execute through proxies. Using an initializer ensures state is properly set through proxy calls. The entire proxy pattern relies on replacing constructors with explicit initialization.

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Web3Learner_Abaz

@Web3LearnerAbaz • 18h

Transitioning from TradFi to DeFi Risk: Should I Prioritize Quant Modelling or Smart-Contract Risk?

I’m trying to transition from traditional finance risk into crypto/DeFi risk roles, but I’m honestly struggling to understand what the real job looks like beyond industry jargon.In TradFi we relied...

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Difficulty - Medium

Total Plays - 1

Allowed Time - 10 sec

Best time - 10 sec

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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Difficulty - Medium

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Why is assert() dangerous in production?

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Explanation:
assert() triggers a Panic error and is intended only for internal guarantees. If it fires in production, it indicates a compiler or logic bug. Developers should use require() for user-facing validation.

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Fady Efat

@hACjMzw • 1d

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 - 2

Allowed Time - 10 sec

Best time - 10 sec

Why is msg.value validation kept at the top of functions?

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Explanation:
Validating msg.value early ensures no state mutation occurs before detecting invalid ether transfers. This prevents partially updated storage on failure, preserving atomicity. It aligns with checks-effects-interactions

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Difficulty - Medium

Total Plays - 1

Allowed Time - 10 sec

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What does a selector collision indicate?

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Explanation:
Selector collisions occur when different function signatures hash to the same first 4 bytes. This leads to unintended dispatching and silent bugs. It’s especially dangerous in diamond proxies and minimal routers.

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Application deadline: 4 weeks

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Senior Software Engineer, Frontend

Phantom • FULL_TIME • NA

Job description

This role focuses on frontend engineering for Phantom’s multi-chain self-custodial crypto wallet. The engineer will be responsible for building and enhancing user-facing features across the Phantom browser extension and website, contributing to UI performance, responsiveness, and quality. The position includes driving product enhancements that expand blockchain support, improving cross-chain usability,...

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