Application Security 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 Role The Application Security team at Fireblocks treats security as a high-stakes engineering discipline, not an administrative task. We are looking for an Adversarial Builder to lead the defense of our Global Application Landscape—securing everything from our core SDLC and Software Supply Chain to our enterprise-wide AI adoption. In this hands-on role, you will: Engineer, Don’t just triage: Move beyond manual reviews to build code-driven detection logic and custom AI agents that automate vulnerability hunting, triaging and remediation. Security by design: Partner with R&D teams (including Infra and DevOps) to define the application-level technical guardrails for internal and external-facing products. Scout the Frontier: Act as an early adopter of state-of-the-art systems, evaluating and integrating cutting-edge tech from frontier security startups in AI and Cloud Runtime security. This role demands a practitioner who thinks like an attacker, possesses a developer’s urge to automate, and has the broad landscape understanding to connect dots across complex, modern domains. What You’ll Do Promote Enterprise-Grade Security Initiatives: Engineer and scale the security strategy for Fireblocks’ entire product ecosystem, spanning both internal infrastructure and external-facing products. You will ensure code security at scale by hardening the SDLC,