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Senior Security Engineer, DeFi

Mysten Labs
Remote, USA
Full-time
Senior · 3+ years experience
Remote
USD 165000-225000 yearly / year
Discovered 1 months ago
TypeScriptPythonRustSQLSui GraphQLgRPC

Full Job Posting

Minimum Qualifications

  • Bachelor's degree in Computer Science, Computer Engineering, a relevant technical field, or equivalent practical experience.
  • 3+ years of hands-on experience in security engineering, smart contract security, or DeFi risk engineering, with a track record of building tools that ran in production and of finding real vulnerabilities (audit findings, bug bounty reports, published research, or incident work).
  • Strong understanding of DeFi mechanics and their failure modes: lending markets (LTV, liquidation thresholds and bonuses, close factors, bad debt), AMMs and concentrated liquidity, perpetuals, liquid staking, oracles (staleness, confidence, TWAP, multi-source aggregation), flash loans, and MEV.
  • Proficiency in TypeScript and Python, and comfort with Rust. Ability to write SQL over large datasets and to work with blockchain indexers and data warehouses.
  • Experience reading smart contract code at source or the bytecode or disassembly level, or evident ability to learn it quickly. Move experience is a plus, not a requirement; Solidity or Rust smart contract experience transfers.
  • Rigor: you verify claims against bytecode and chain state, build known-clean checks into your tools, and say what you did not verify.
  • Strong written and verbal communication, including the ability to influence external teams you have no formal authority over
  • Interest in the web3 space is required.

Preferred Qualifications

  • Sui and Move experience: the object and capability model, package upgrades and version gates, programmable transaction blocks, the Sui GraphQL and gRPC APIs.
  • Knowledge of the recent DeFi exploit history on Sui and other chains: named incidents, oracle compromises, and the defect classes behind them.
  • Experience building analysis or monitoring tools with LLM agents (Claude Code skills or comparable), and a clear sense of where models help and where deterministic tooling must do the work.
  • Static or dynamic program analysis experience: taint analysis, call graphs, symbolic execution, fuzzing, formal verification.
  • Quantitative or economic modeling experience: stress testing, liquidity modeling, risk parameters for lending markets.
  • Publications, conference talks, CVEs, or bug bounty rankings.
  • Employment is contingent upon the successful completion of a background check, which may include verification of employment history, education credentials, criminal history, and other relevant information.
  • Regarding the recent rash of technology job scams: Be aware that emails from genuine Mysten Labs group recruiters will always come from the @ mystenlabs.com domain or related subdomains (e.g., mystenlabs.com/careers ). Remember: you can always verify positions on our job boards at www.mystenlabs.com/careers .
  • To support an efficient and fair hiring process, we may use technology-assisted tools, including artificial intelligence (AI), to help identify and evaluate candidates. All hiring decisions are ultimately made by human reviewers.
  • Our team is remote first and we are hiring across the world. Here at Mysten Labs, you’ll be joining a world-class team with tremendous growth potential as we bring the next billion users to web3. We raised a $300M Series B round from top Silicon Valley led venture funds like Jump Crypto, Andreessen Horowitz (a16z), Binance Labs, Redpoint, Lightspeed, Coinbase Ventures, Electric Capital, Standard Crypto, NFX, Slow Ventures, Scribble Ventures, Samsung Next, Lux Capital, among other investment firms and strategic partners. Come join us and build the future of web3!

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