Security Engineer

About the Role 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. Security is fundamental to protecting our customers and business, and this role will drive both tactical improvements and long‑term strategy for securing our applications and authentication systems. Key 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 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. Deep understanding of Linux internals. Strong communication and collaboration skills, able to influence engineering and product teams. 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. Culture Fit Passion for progress, adaptability, resilience, comfortable navigating ambiguity. Builder’s mindset, excited to create, iterate, and scale IS practices. Collaborative partner, able to influence across functions and cultures with empathy and clarity. Demonstrates integrity and accountability, especially in managing confidential information across diverse legal and cultural contexts. Experience working in a remote environment. Benefits and Opportunity Ledn offers a comprehensive rewards package, competitive PTO, ownership equity, and the flexibility to work remotely anywhere in the world for up to 180 days. We are an equal‑opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. Job Details Seniority level: Mid‑Senior level Employment type: Full‑time Job function: Information Technology Industries: Retail Location: Remote (eligible up to 180 days onsite) #J-18808-Ljbffr