• Job Expired
    Singapore / Vietnam / Hong Kong Posted: Dec 16, 2025
    Job description
    GRVT is building a trading platform with a focus on performance, reliability, and continuous operation. The Senior Backend Engineer role sits within the Trade Engineering team and is responsible for designing, developing, and operating core backend components such as matching engines, order management systems, and real-time market and trade data...
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  • Job Expired
    A

    Blockchain Data Wizard (Analyst or Scientist)

    Allium • Full Time • NA

    Remote Posted: Dec 16, 2025
    Job description
    Allium is a blockchain data infrastructure company focused on making on-chain data accurate, accessible, and usable at scale. The Blockchain Data Wizard role sits within the engineering team and is responsible for transforming raw, fragmented blockchain data into standardized, production-ready data models. This position combines protocol research, data engineering, and...
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  • Job Expired
    Singapore (Hybrid) Posted: Dec 16, 2025
    Job description
    Crypto.com’s Blockchain Engineering group builds and maintains software for venture-style initiatives that extend beyond its core products. This senior QA automation role focuses on ensuring quality across scalable applications spanning frontend interfaces and backend infrastructure. The position emphasizes automation-first testing, test framework development, and close collaboration with engineering and product...
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  • Job Expired
    C

    Software Developer – Early Career

    Crypto.com • Full Time • NA

    Singapore (Hybrid) Posted: Dec 16, 2025
    Job description
    Crypto.com is a global digital asset platform operating products used by a large international user base. This role sits within an engineering team responsible for building and maintaining software for venture-style projects that extend beyond the company’s core offerings. The position involves contributing across the application stack, including user-facing interfaces...
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  • Shubhada Pande

    Shubhada Pande

    @ShubhadaJP • Dec 14, 2025

    Web3 Hiring Signals

    Your curated hub for understanding how Web3 teams actually evaluate talent — beyond resumes, GitHub stars, and surface-level interviews.This page organizes AOB discussions and articles that help founders, hiring managers,...
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    P

    Security Engineer

    Parity • Full Time • NA

    Remote Posted: Dec 13, 2025
    Job description
    Parity builds and maintains core open-source blockchain infrastructure, including Polkadot, the Polkadot SDK, and Kusama. The Security Engineer will join the Security Engineering team and focus on strengthening the security posture of Parity’s blockchain ecosystem. This role involves auditing and, where required, writing secure Rust code, performing in-depth manual and...
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  • Job Expired
    P

    Smart Contract Engineer

    Polymarket • Full Time • NA

    Remote Posted: Dec 13, 2025
    Job description
    Polymarket operates a large-scale prediction market protocol where users trade on real-world outcomes using on-chain infrastructure. The Smart Contract Engineer will join the core protocol team and own the design, development, and deployment of Solidity smart contracts that secure and operate high-volume peer-to-peer markets. This role focuses on building and...
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  • Job Expired
    C

    Rust Engineer

    Cryptio • Full Time • NA

    Remote Posted: Dec 13, 2025
    Job description
    Cryptio builds enterprise-grade back-office and data infrastructure used for accounting, reporting, and operational workflows in the digital asset ecosystem. The Rust Engineer will join the Accounting squad, focusing on the systems that power cost basis calculations, PnL, staking, derivatives, accruals, and large-scale reporting pipelines. This role owns the design and...
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  • Difficulty - Medium
    Total Plays - 11
    Allowed Time - 10 sec
    Best time - 3.307

    Why should developers avoid using tx.origin for authentication?

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

    #A
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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.
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  • Difficulty - Medium
    Total Plays - 12
    Allowed Time - 10 sec
    Best time - 1.493

    Why are fallback functions dangerous?

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

    #A
    #B
    #C
    #D
    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

    Why can abi.encodePacked cause issues?

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

    #A
    #B
    #C
    #D
    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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