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Job DescriptionCareer Renew is recruiting for one of its clients a Principal Security Engineer - Crypto - this is a fully remote role for US/EU based candidates. Join a stellar team of leaders and experts in blockchain technology, cryptography, infrastructure, and security to build the backbone of blockchain wallet infrastructure for the next financial era. We’re hiring a Principal Security Engineer to lead security design and development across our platform. Reporting to the CISO, you’ll set the strategy to protect our systems, fix vulnerabilities, and keep client wallets safe. Your work will span the full security lifecycle: architecture reviews, threat modeling, penetration testing, incident response, and secure software practices. You’ll work closely with engineering, infrastructure, and product teams to make security part of every layer of the stack, while ensuring compliance with industry standards. Beyond defense, you’ll design new security features, test ideas to improve resilience, and share your knowledge with the wider community through articles or conferences. Preferred experience Responsibilities * Lead security architecture, setting priorities and ensuring secure, reliable delivery. * Drive threat modeling, vulnerability management, and pentesting (internal and external). * Conduct and oversee security reviews (code, design, architecture, and dynamic testing). * Design and implement defense-in-depth security controls. * Build frameworks for automated security testing and SSDLC enforcement. * Mentor engineers on secure coding, incident response, and best practices. * Manage bug bounty, security releases, and coordinate with external researchers. * Monitor and respond to emerging threats, including supply chain risks. * Represent the company in client discussions, audits, and at security conferences. Requirements * 10+ years of experience in security engineering, with leadership in fintech or blockchain. * Strong expertise in application security, smart contract security, and cryptography. * Deep understanding of pentesting, static/dynamic testing, vulnerability management. * Hands-on with secure networking, cloud security (AWS), and software supply chains. * Familiar with industry standards and frameworks (ISO 27001, NIST, CIS, SOC 2, etc.). * Strong knowledge of network and web protocols, applied cryptography, and PKI. * Experience integrating security into CI/CD pipelines and observability systems. * Proficient in TypeScript and Rust (or similar languages) with secure coding expertise. * Clear communicator who can explain complex security concepts to both technical and business stakeholders. Compensation & Package * Title: Principal Security Engineer * Salary: $220,000–300,000 per year (full-time) * Equity: 150–300 stock options vested over 4 years * Benefits: Healthcare, 401K, and travel expenses * Location: US or EU (remote-first, office optional) * Equipment: MacBook Pro + essentials