Staff Application Security Engineer

Overview Join us as a Staff Application Security Engineer at LEDN . Opportunity LEDN is a global financial services company built for digital assets, offering egalitarian lending, savings, and trading products to Bitcoin holders worldwide. We are seeking a full‑time Staff Application Security Engineer with deep expertise in Application Security, Identity & Access Management, and Confidential Computing to strengthen the security of our Bitcoin‑backed loan platform. 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 pipelines. 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 such as WebAuthn, passkeys, and 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 using AWS Nitro Enclaves. Integrate Nitro Enclaves with KMS and secure APIs. Migrate high‑value operations 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 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. Remediation of vulnerabilities identified in penetration test reports. Strong communication and collaboration skills, able to influence engineering and product teams. Experience working in a remote environment. 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 & Ideal Candidate Passionate and adaptable, thriving in a high‑growth, fast‑paced environment. Builder’s mindset with excitement to create, iterate, and scale IS practices. Collaborative partner with empathy and clarity, able to influence across functions and cultures. Demonstrates integrity and accountability, especially when managing confidential information across diverse legal and cultural contexts. Has worked in a remote environment. What We Provide Tremendous growth opportunities in a leading digital asset company. Comprehensive, best‑in‑class total rewards package. Competitive PTO package. Ownership and shared equity in the company. Remote work flexibility for up to 180 days per year. A career that provides purpose and removes barriers. Equal Opportunity We are an equal‑opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. Please reach out to the LEDN team for accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Working Environment Our team is truly global, spanning North America, Latin America, South Africa, and Europe. We are a remote‑first environment. #J-18808-Ljbffr