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Senior Quantitative Researcher

Swissblock Technologies • Full Time

Remote · Switzerland - Remote Posted: Mar 8, 2026

Job description

Swissblock Technologies is a private investment firm focused on integrating cryptocurrency markets with cross-asset investment strategies. The firm manages systematic multi-strategy portfolios that combine digital assets with traditional financial markets using quantitative research and algorithmic trading systems. The Senior Quantitative Researcher will join the Systematic Crypto Group, where researchers transform...

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Difficulty - Medium

Total Plays - 1,571

Allowed Time - 10 sec

Best time - 1.252 sec

What is the most direct risk of “unbounded loops” in on-chain code?

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#A

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#D

Explanation:
Unbounded loops can make functions exceed block gas limits as state grows, permanently preventing execution—classic denial of service. This is common in airdrop distributions, iterating holders, or clearing arrays. Security interviews test this because it’s a real production failure: “worked in tests” but becomes uncallable at scale. Mitigations include batching/pagination and off-chain indexing.

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Difficulty - Medium

Total Plays - 1,566

Allowed Time - 10 sec

Best time - 0.000 sec

Which bug class is most associated with incorrect upgradeable storage layout?

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

#A

#B

#C

#D

Explanation:
In upgradeable contracts, the proxy holds storage while the implementation code changes. If developers reorder variables or change types, storage slots map incorrectly—corrupting balances, roles, or critical pointers. This is a high-severity issue in audits. Interviewers expect candidates to mention append-only storage layout, storage gaps, and standards like EIP-1967 for proxy slots.

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Difficulty - Medium

Total Plays - 1,565

Allowed Time - 10 sec

Best time - 0.778 sec

What is the core risk of using tx.origin for authorization?

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#A

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#C

#D

Explanation:
tx.origin authorization can be bypassed if a user is tricked into calling an attacker contract, which then calls the target contract—tx.origin remains the user. This is a known insecure pattern in Ethereum security. Interviewers like it because it tests whether candidates understand call chains and why msg.sender + explicit access control is the correct boundary.

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Is Blockchain Hiring Actually Recovering in 2026? A Reality Check for Job Seekers

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Jobe in Blockchain

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From On-Chain Intelligence to Product Strategy in Blockchain Risk Infrastructure

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Rust backend roles (SF on-site): what proof gets you shortlisted for production Rust services (reliability + concurrency + scale)?

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Shubhada Pande
@ShubhadaJP • Mar 2, 2026

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Remote Web3 hiring looks alive again — but if you’re applying across borders (India → US, EU → US, LATAM → US, or simply “global remote”), it can feel like...

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AOB Announcement: 1:1 Direct Messaging is live (request-based)

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AnitaSmartContractSensei
@SmartContractSensei • Mar 19, 2026

Mar 19, 2026

185

US hiring: why “senior Solidity” roles reject 4+ yr candidates — which hiring signals are missing?

I’m applying to US web3 smart contract roles (mostly early-stage startups, remote). I’ve got 4+ years in Solidity, shipped mainnet code, and I can clear technical screens — but I...

Like 6 Replies 6
Difficulty - Medium

Total Plays - 1,566

Allowed Time - 10 sec

Best time - 0.263 sec

Which keyword prevents a state variable from being modified after deployment construction?

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

#A

#B

#C

#D

Explanation:
immutable variables are assigned once (typically in the constructor) and then become read-only. They are stored in bytecode rather than regular storage slots, which can reduce gas compared to storage reads. This matters in Solidity interviews because immutables are common in optimized contracts (e.g., router addresses) and in secure configuration patterns.

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Difficulty - Medium

Total Plays - 1,563

Allowed Time - 10 sec

Best time - --

Which storage type enables EIP-1167 minimal clones to be cheap?

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#A

#B

#C

#D

Explanation:
Minimal proxy clones (EIP-1167) keep logic in an implementation and rely on proxy bytecode forwarding calls, making deployment cheap. In practice, immutables in the implementation help keep runtime reads efficient and reduce repeated storage reads for configuration-like values. Candidates are often tested on why clones save gas and how configuration is safely handled.

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Difficulty - Medium

Total Plays - 1,565

Allowed Time - 10 sec

Best time - 1.736 sec

Which pattern most directly reduces reentrancy risk on external transfers?

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

#A

#B

#C

#D

Explanation:
The Checks-Effects-Interactions (CEI) pattern reduces reentrancy by making you validate inputs and update internal state before any external call (like ETH transfer or token transfer). If a malicious contract re-enters, state has already moved forward, limiting exploitability. Many interviewers treat CEI as a must-know Solidity security habit for production contracts

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Difficulty - Medium

Total Plays - 1,563

Allowed Time - 10 sec

Best time - 6.708 sec

In EVM, which opcode can silently fail and return a boolean instead of reverting?

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

#A

#B

#C

#D

Explanation:
Low-level CALL (and friends like DELEGATECALL) returns a success flag rather than automatically bubbling a revert. If you don’t check that boolean (or decode return data properly), your contract may continue in a “success-looking” state while the external call actually failed. This is a classic Solidity audit finding tied to unsafe external interactions.

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Wasim Choudhary
@K9QfAg6 • Apr 12, 2026

Apr 12, 2026

188

ZKP developer q/a

Any ZKP developers here? I’m seriously considering moving into Zero-Knowledge Proof development and would like to understand the real path to becoming one — beyond tutorials and surface-level guides. I’m...

Like 4 Replies 4
SmartChainSmith
@SmartChainSmith • Apr 28, 2026

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201

Bay Area smart contract dev relocation: relocation to US for blockchain roles realistic timeline — what did yours look like?

I’m planning Bay Area relocation for a smart contract developer role and I need a realistic answer on the relocation timeline to the US when visa sponsorship and hiring cycles...

Like 6 Replies 4
Difficulty - Medium

Total Plays - 1,583

Allowed Time - 10 sec

Best time - --

Which audit signal indicates poor threat modeling?

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#A

#B

#C

#D

Explanation:
A happy-path-only focus is a strong signal of poor threat modeling in blockchain security because it ignores attacker behavior, edge cases, and abuse scenarios. Strong smart contract audit readiness requires adversarial thinking, not just normal-flow testing.

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