Senior Security Engineer DeFi & AI Security

About this role

## Tasks

Remote | US & Canada | UK & EU – EST Hours

Join a fast-growing fintech and blockchain technology company building secure financial infrastructure for the next generation of on-chain finance.

We are looking for a Senior Security Engineer to partner with the Head of Security and help build, operate, and scale the company’s security program. You’ll work at the intersection of capital, risk, technology, and blockchain, securing systems that support sophisticated financial activity and high-value digital assets.

You’ll own security initiatives across product, infrastructure, and operations, designing controls, automation, monitoring, and detection capabilities for highly adversarial environments.

What You’ll Do

* Threat model new product features and integrations and strengthen systems with effective security controls.
* Operate and improve the application security toolchain while keeping it high-signal for engineering teams.
* Own day-to-day security operations across EDR, SIEM, on-chain monitoring, identity, and cloud security.
* Triage security alerts, investigate incidents, resolve vulnerabilities, and continuously reduce security noise.
* Assess vulnerability and bug-bounty findings based on actual exposure and drive remediation through completion.
* Support incident response activities from initial investigation through resolution.
* Lead security tooling and projects from evaluation and vendor selection through company-wide implementation.
* Collaborate closely with engineering, infrastructure, product, and other teams.
* Automate repetitive security workflows using AI, including vulnerability management, AppSec, access reviews, SOC 2 and audit evidence collection, vendor due diligence, and recurring security reporting.
* Build reusable AI components, Claude skills, and security agents that can be adopted by engineering and other teams.

## Requirements

* 5+ years of hands-on security engineering experience acr...