Senior QA Engineer (Web3 Smart Wallet)

Location: Europe / Canada; hybrid workplace.

Company

hirify.global is a global commerce company providing tools and services that help video game developers fund, distribute, market, and monetize games.

What you will do

• Own end-to-end testing for a consumer smart wallet on hirify.global ZK, covering sign-in, wallet creation, asset display, transfers, transaction confirmation, and release validation.
• Test account-abstraction flows, signing, UserOperations, bundlers, EntryPoint execution, paymasters, session keys, signer behavior, and counterfactual wallet deployment.
• Use forked and local chains to deploy, call, inspect, and trace smart contracts; investigate reverts, failed operations, reorgs, finality issues, and indexer divergence.
• Validate ERC-20, ERC-721, and ERC-1155 transfers and approvals, wallet SDK and contract integrations, and security scenarios including replay, phishing, and approval abuse.
• Build and maintain Playwright and TypeScript automation in CI, including AI tooling configured for test design, automation, review, and log analysis.
• Collaborate with the wallet-infrastructure partner and security team, provide evidence for integration defects, and mentor QA engineers entering Web3.

Requirements

• Bachelor’s degree in Computer Science, Software Engineering, Information Systems, or a related field, or an international equivalent.
• 6+ years of software testing or quality engineering experience, including 2+ years of hands-on testing on EVM-based products.
• Hands-on experience with viem and wagmi; ethers.js is also accepted, including contract-state reading, transaction sending, event decoding, and revert-error decoding.
• Experience deploying and interacting with smart contracts using Foundry or Hardhat, with enough Solidity knowledge to understand contract behavior.
• Experience with chain forking and simulation using Anvil, Tenderly, or similar tools, and tracing failed transactions to their revert reason.
• Working knowledge of Ethereum transactions, nonces, gas, receipts, events, logs, reverts, reorgs, rollup finality, and indexer divergence.
• Knowledge of ERC-20, ERC-721, and ERC-1155 mechanics, wallet signers, EOAs, embedded wallets, smart accounts, EIP-191, EIP-712, EIP-1193, and ERC-1271.
• Practical understanding of ERC-4337 account abstraction, including UserOperations, bundlers, EntryPoint, paymasters, counterfactual deployment, CREATE2, and session keys.
• Understanding of wallet security risks including signature replay, cross-chain replay, typed-data phishing, and token approval abuse.
• TypeScript or JavaScript test automation, Playwright or a similar UI automation framework, REST and JSON-RPC testing, bundler methods, and basic SQL.
• Daily hands-on use of Claude Code, Codex, or Cursor for test design, automation, review, log analysis, transaction-trace analysis, and repository configuration.
• Ability to conduct complex, high-impact testing independently and collaborate across time zones.
• Excellent written and spoken English required.

Nice to have

• Experience with wallets, decentralized exchanges, NFT marketplaces, consumer-scale products, or gaming products.
• Experience with ZK Stack, zk-rollups, zkSync-family chains, embedded, MPC, or white-label wallet SDK integrations.
• Knowledge of EIP-7702, ERC-6492, Foundry fuzz and invariant testing, OpenZeppelin contracts, and the ERC-4337 reference implementation.
• Ability to read Go.
• Experience with load and performance testing of high-volume transaction flows, such as k6.

Culture & Benefits

• Hybrid work in Europe or Canada within a small senior engineering team.
• Medical, dental, and vision coverage, PTO, and support for employees and their families.
• Personalized career roadmaps, training, and educational opportunities.
• Inclusive workplace focused on collaboration, creativity, and employee well-being.
• Background checks may include criminal history, employment, and education verification because the role accesses confidential company data and supports regulatory compliance.