Cryptography Reliability Engineer

The world of digital assets is accelerating in speed, magnitude, and complexity, opening the door to new ways for leveraging the blockchain. Fireblocks’ platform and network provide the simplest and most secure way for companies to work with digital assets and it trusted by some of the largest financial institutions, banks, globally-recognized brands, and Web3 companies in the world, including BNY Mellon, BNP Paribas, ANZ Bank, Revolut, and thousands more.

About The Team

Fireblocks' Cryptography Research and Engineering groups build the security technology that protects billions in digital assets. Innovation moves us forward, but quality and resilience keep us safe in production. We invest heavily in rigorous testing and seek a leader dedicated to maintaining best‑in‑class quality. You will own the test strategy, tooling, and risk‑prevention culture that hardens every line of crypto code before it reaches customers.

What You’ll Do

• Build cryptography and security tests. Develop and maintain high‑coverage test suites of cryptography and security tests in C/C++ (mainly) and integrate advanced tools such as fuzzing.
• Define and own the quality roadmap. Establish a comprehensive test strategy (unit, integration, statistical, compatibility, and performance) that targets a 99 % confidence level across all cryptographic components and platforms.
• Drive continuous improvement. Embed secure‑development‑lifecycle checkpoints, instrument metrics for coverage, flakiness, and regression detection, analyse failures, and prioritise remediation with engineering leads.
• Coordinate independent audits. Manage relationships with external cryptography consultants who perform black‑box reviews and certification testing, while maintaining clear hand‑offs without daily code collaboration.
• Document and certify. Produce traceable logs, unique test identifiers, and evidence packages to support formal certifications (e.g., FIPS, ISO, IETF RFC).
  
  

• Deep familiarity with applied cryptography (ECC, RSA, commitments schemes and threshold signatures) and common issues in real‑world implementations.
• Hands-on expertise in C/C++, plus Python scripting for automation.
• Advanced testing techniques including coverage analysis, fuzzing, emulator‑based differential testing, and stress‑testing under extreme concurrency.
• Experience collaborating with external auditors or certifying bodies and ability to translate findings into actionable engineering tasks.
• Excellent communication skills and the ability to advocate for risk mitigation and a strong quality culture across engineering, product, and leadership.
• Performance-tuning mindset experience designing and interpreting automated memory/CPU/network benchmarks - Advantage
• Track record leading QA or quality‑engineering efforts for security‑critical or cryptographic software - Advantage
• Experience with secure hardware - Enclaves or HSMs - Advantage