Ledn is the leading bitcoin-backed lender dedicated to providing secure, transparent, and efficient digital asset solutions. Our mission is to help clients build long-term wealth in hard assets through interest-earning accounts, loans, and trading services. What we all have in common is an unshakeable conviction that digital assets can democratize access to the general economy and Ledn’s suite of products & services can play a critical role in doing so. The core values that guide us are: act with integrity always, own it, have a passion for progress, and lead with empathy. As a full-time Sr. Security Engineer & CISO , you'll be a hands-on, high-ownership individual contributor strengthening our product, cloud, and software delivery security. You'll find vulnerabilities before attackers do, build controls that prevent entire classes of issues from reaching production, and help engineers ship securely. A builder-and-breaker role: you'll assess our applications, APIs, AWS environment, Cloudflare edge, and GitHub workflows from an adversary's perspective,



then partner with owners to remediate findings and validate fixes. You'll turn lessons learned into standards, automation, and measurable improvements, while collaborating with Software Engineering, DevOps, Risk, and Compliance to deliver technical controls, audit evidence, and incident readiness.

Beyond hands-on security engineering, you'll serve as the Spain entity's CISO within the second line of defense — owning the local Information Security Framework and ICT Risk Register, reporting periodically to the Board, and acting as primary contact for the CNMV and external auditors on cybersecurity and DORA compliance.

Penetration Testing: Plan and execute hands-on testing of web apps, APIs, mobile-facing services, and infrastructure; Adversarial Validation: Run red-team and purple-team exercises around realistic attack paths; work with defenders to improve preventive controls, telemetry, detections, and response playboo

📌 Senior Security Engineer (Castilla-La Mancha)
🏢 Ledn
📍 Castilla-La Mancha