Security Engineer

OverviewJoin to apply for the Security Engineer role at LEDN . Ledn is a global financial services company built for digital assets, helping to improve the everyday lives of Bitcoin holders while building generational wealth for the future. We offer a suite of egalitarian lending, savings and trading products to digital asset holders in over 150 countries. Our team is diverse and values integrity, progress, and empathy. The Opportunity We are seeking a full-time Security Engineer with deep expertise in Application Security, Identity & Access Management, and Confidential Computing to strengthen the security of our Bitcoin-backed loan platform. This hands-on engineering role has direct impact on product security, infrastructure security, and customer trust. You will work across our JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices, and evolve our authentication layer toward modern, phishing-resistant approaches. You will also design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated environments. About The Role Application Security: Lead secure design and code reviews; define and enforce secure coding practices for JavaScript/TypeScript services; automate vulnerability detection (SAST, SCA, DAST) within CI/CD; conduct threat modeling and risk assessments; partner with engineers to remediate vulnerabilities. Authentication & Identity: Own the roadmap for authentication and identity across customer and internal applications; enhance Cognito-based identity with stronger MFA (WebAuthn, passkeys, hardware tokens); align usability, compliance, and security in authentication flows; define secure session management and device trust. Confidential Computing (AWS Nitro Enclaves): Design enclave-based architectures to isolate sensitive workloads; integrate Nitro Enclaves with KMS and secure APIs; migrate high-value operations into enclave environments; ensure compliance, auditability, and resilience. Additional Security Domains: Harden AWS services with least-privilege IAM and secure key management; improve Kubernetes security posture; deploy and operate a SIEM framework; support compliance initiatives (SOC 2, ISO 27001). What You Bring To Ledn 10+ years of proven experience in Application Security for web and cloud-native applications. Strong knowledge of JavaScript/TypeScript/Golang/Python and modern web vulnerabilities (OWASP Top 10, auth bypasses, business logic flaws). expertise with AWS security best practices, especially in serverless architectures; hands-on experience with AWS Nitro Enclaves; deep understanding of OAuth2, OIDC, WebAuthn, FIDO2; practical experience with Cognito/Auth0 (MFA, custom flows, secure session handling). Background in SIEM design and log correlation; familiarity with Kubernetes security (RBAC, pod security, image scanning); experience with Secure Code Review; understanding of software supply chain; strong Linux knowledge. Ability to remediate vulnerabilities identified in penetration tests; strong communication and collaboration skills to influence engineering and product teams. Nice To Haves Familiarity with Bitcoin custody and key management practices; knowledge of Infrastructure as Code security (Terraform, AWS CDK); prior work on user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture Fit Seeking a leader who thrives in a startup/tech environment and embodies our values of integrity, progress, and empathy. Demonstrates adaptability, resilience, collaboration, and a builder’s mindset to create and scale security practices. Ability to navigate ambiguity in a high-growth environment and influence across functions with empathy and clarity. The Ideal Candidate Will Be adaptable, resilient, and excited to work in a remote environment; have a passion for progress. Collaborate across teams, maintain accountability for confidential information, and drive security initiatives forward. A Taste Of What We Provide Tremendous growth opportunities and a comprehensive rewards package, including competitive PTO and equity ownership in the company. Remote-work flexibility up to 180 days per year (subject to restrictions). A purpose-driven role focused on security and a diverse, inclusive work environment. Ledn is an equal opportunity employer and values diversity. Applicants may request accommodations during the recruitment process; requests will be addressed confidentially. #J-18808-Ljbffr