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Backend Security Engineer

Full-time
Hybrid
Mid
Tel Aviv, Israel

Fordefi is the first institutional-grade wallet platform purpose-built for DeFi. We’re a team of crypto custody and cybersecurity experts on a mission to make decentralized finance secure and accessible for institutions. Backed by $28M from leading investors, we power over 150 firms that use our MPC wallet to safely deploy capital across multiple blockchains.

WHAT YOU WILL BE DOING

  • Write production-grade, security-critical code that forms the foundation of Fordefi’s system—trusted to manage billions of dollars in digital assets.
  • Develop and maintain key-management infrastructure, including features such as secure device provisioning, backup and recovery, and key-based device authentication.
  • Analyze threat models and design features that provide rigorous security guarantees leveraging established cryptographic primitives and secure hardware enclaves.
  • Build mechanisms for authentication, authorization, transaction integrity, and policy enforcement.

WHAT WE ARE LOOKING FOR

  • 3+ years of experience in software development (backend or low-level)
  • 3+ years in a security-focused engineering role
  • Hands-on experience with secure system design, including digital signatures and symmetric/asymmetric encryption
  • Strong communication skills and a problem-solving mindset
  • Curious, thorough, and a strong team player

Nice to Have

  • Experience with AWS KMS, HSMs, or enclaves
  • Academic background in cryptography