Principal Security Engineer

Principal Security Engineer - Blockchain Wallet Infrastructure

Location: Remote - Location: US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred

Compensation: $220K - $300K

Join a stellar team of leaders and experts in blockchain technology, cryptography, and infrastructure to build the backbone of blockchain wallet infrastructure for the next financial era. We are hiring a Principal Security Engineer to lead security design and development across our entire platform. Reporting directly to the CISO, you will set the strategy to protect our high-stakes financial systems, fix vulnerabilities, and keep client wallets safe.

This is a strategic and highly technical role spanning the full security lifecycle. You will make security part of every layer of the stack, from architecture design to incident response. Beyond defense, you will champion secure development practices, mentor engineers, and represent the company's security posture to clients and the wider community.

Responsibilities:

• Security Leadership: Lead security architecture, setting priorities and ensuring secure, reliable delivery across the platform.
• Vulnerability Management: Drive threat modeling, vulnerability management, and coordinate both internal and external penetration testing efforts.
• Secure Software Development: Conduct and oversee security reviews (code, design, architecture), and build frameworks for automated security testing and SSDLC enforcement within CI/CD pipelines.
• Defense & Controls: Design and implement defense-in-depth security controls across application, infrastructure, and cloud environments (AWS).
• Incidence & Threat Management: Monitor and respond to emerging threats (including supply chain risks), manage the bug bounty program, and coordinate security releases.
• Compliance & Representation: Ensure compliance with industry standards (ISO 27001, SOC 2, etc.), and represent the company in client discussions, audits, and at security conferences.
• Mentorship: Mentor engineers on secure coding, incident response, and security best practices.

• Experience: 10+ years of experience in security engineering, with significant leadership experience in fintech or blockchain.
• Security Expertise: Strong expertise in application security, smart contract security, and cryptography.
• Testing Proficiency: Deep understanding of pentesting, static/dynamic testing, and vulnerability management.
• Systems Knowledge: Hands-on experience with secure networking, cloud security (AWS), and software supply chains.
• Languages: Proficient in TypeScript and Rust (or similar systems languages) with secure coding expertise.
• Standards & Compliance: Familiarity with industry standards and frameworks (ISO 27001, NIST, CIS, SOC 2, etc.).
• Protocols: Strong knowledge of network and web protocols, applied cryptography, and PKI.
• Process: Experience integrating security into CI/CD pipelines and observability systems.
• Communication: Clear communicator who can explain complex security concepts to both technical and business stakeholders.