Staff Application Security Engineer

Staff Application Security Engineer @ LEDN Join to apply for the Staff Application Security Engineer role at LEDN. 1 month ago Be among the first 25 applicants. 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 around the world. Our team at Ledn is a passionate group of individuals from diverse backgrounds. The core values that guide us are: act with integrity always, own it, have a passion for progress, and lead with empathy. Responsibilities Lead secure design and code reviews across engineering teams. 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 for new features. Partner with engineers to remediate vulnerabilities and improve secure development practices. Own the roadmap for authentication and identity across customer and internal applications. Enhance existing Cognito‑based identity architecture with stronger, phishing‑resistant MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). Collaborate with Product to align usability, compliance, and security in authentication flows. Define secure approaches to session management, device trust, and account recovery. Design enclave‑based architectures to isolate and protect sensitive workloads. Integrate Nitro Enclaves with KMS and secure APIs. Migrate high‑value operations (e.g., cryptographic and financial processes) into enclave environments. Ensure compliance, auditability, and resilience of enclave workloads. Harden AWS services (Lambda, API Gateway, SQS, SNS) with least‑privilege IAM and secure key management. Improve Kubernetes security posture (RBAC, pod security, image scanning, runtime monitoring). Deploy and operate a SIEM framework; develop detection rules, dashboards, and incident playbooks. Support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. Qualifications 10+ years minimum of proven experience in Application Security with a focus on 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, particularly in serverless architectures. Hands‑on experience with AWS Nitro Enclaves for confidential computing. Deep understanding of authentication and authorization standards (OAuth2, OIDC, WebAuthn, FIDO2). Practical experience with Cognito / Auth0 (MFA, custom flows, secure session handling). Background in SIEM design and log correlation across cloud and application layers. Familiarity with Kubernetes security (RBAC, pod security, admission controls, image scanning). Experience with Secure Code Review. Understanding of software supply chain. Deep understanding of Linux internals. Remediate vulnerabilities identified in the penetration test report. Strong communication and collaboration skills, able to influence engineering and product teams. Experience working remotely. Nice to Have 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. Benefits As one of the world's leading digital asset companies, we provide tremendous growth opportunities. Comprehensive, best‑in‑class total rewards package that starts on your first day. Competitive PTO package. Ownership in the company via shared equity. Remote work up to 180 days anywhere in the world. A career that provides purpose. A supportive culture that removes barriers so you love what you do. Legal & EEO We are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. You may reach out to the Ledn team by ****** accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Job Details Seniority level: Mid‑Senior level Employment type: Full‑time Job function: Information Technology Industries: Retail Remote: Up to 180 days anywhere in the world Referrals increase your chances of interviewing at LEDN by 2x #J-18808-Ljbffr