Senior Protocol Security Engineer (Web3)

TL;DR

Senior Protocol Security Engineer (Web3): Owning and strengthening the security of smart contract products from design to production with an accent on smart contract audits, monitoring, incident response, and security tooling. Focus on defining, implementing, and operating smart contract security posture at scale, collaborating with various teams to embed security into the product lifecycle.

Location: Remote, must be based in Western EU. hirify.global does not sponsor visas for persons without work authorization in your location.

Company

hirify.global is a leading enterprise-grade rewards platform that enables institutional customers to stake assets and integrate staking & DeFi functionality into their offerings, managing over $15+ billion in crypto assets.

What you will do

• Protect hirify.global’s production protocols including hirify.global Onchain, hirify.global DeFi, and Railnet.
• Design and execute smart contract security testing, including invariants, fuzzing, and formal verification.
• Perform internal smart contract security audits and provide remediation guidance.
• Own security sign-off for smart contract releases and act as a key decision-maker.
• Contribute to protocol-level threat modelling, including economic, governance, and composability risks.
• Build and maintain smart contract security tooling and continuously improve hirify.global’s security framework.

Requirements

• 5+ years of engineering experience in Web3, with smart contracts running in production.
• Strong hands-on experience with smart contract security, including audits, reviews, or protocol design.
• Solid understanding of protocol-level threat models, including MEV and oracle manipulation, governance and economic attacks, and composability or systemic risk.
• Experience working with external auditors, security reviews, or certification processes.
• Excellent communication skills to explain complex security topics.
• Work authorization in your location is required.

Nice to have

• CTF and Bug bounty track record.
• Contributions to open-source security or smart contract tooling.
• Fluent (written and spoken) in both French and English.

Culture & Benefits

• Fast-paced, bureaucracy-free work environment with equity share options.
• Competitive salary and flexible holiday.
• Flexible remote working and choice of IT equipment.
• Internet connection allowance (€50/month).
• Significant personal development budget and overseas tech conferences budget.

Hiring process

• Recruiter Interview (45 min)
• Take-home test (< 3 hours)
• Technical Interview (60 min)
• Core Values Interview (45 min)
• Founders Interview (30 min)
• Offer!