Staff Application Security Engineer

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. 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). 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 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 and Linux internals. Strong communication and collaboration skills, able to influence engineering and product teams. Remote experience is required. 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 Adapts to an ambiguous, high‑growth, fast‑paced environment. Has a builder's mindset, excited to create, iterate, and scale IS practices. Collaborates across functions and cultures with empathy and clarity. Demonstrates integrity and accountability, especially in managing confidential information across diverse legal and cultural contexts. Has remote work experience. Benefits Competitive PTO package. Ownership and shared equity opportunities. Remote work available up to 180 days worldwide (with restrictions). Comprehensive, best‑in‑class total rewards package starting on day one. Opportunity to work in a remote‑first environment spanning North America, Latin America, South Africa, and Europe. Equal Opportunity We are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. We provide accommodation requests throughout all stages of the recruitment process and will address them confidentially. #J-18808-Ljbffr