Security Engineer

OverviewSecurity Engineer role at LEDN. Ledn is a global financial services company focused on digital assets, providing lending, savings, and trading products. ResponsibilitiesLead 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. Remediate vulnerabilities and improve secure development practices in collaboration with engineers. Own the roadmap for authentication and identity across customer and internal applications. Enhance 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 session management, device trust, and account recovery approaches. Design enclave-based architectures to isolate and protect sensitive workloads using AWS Nitro Enclaves; integrate 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. What You Bring To Ledn10+ 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/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 and understanding of software supply chain. Deep understanding of Linux internals; ability to remediate vulnerabilities from penetration tests. Strong communication and collaboration skills to influence engineering and product teams. Nice To HavesFamiliarity with Bitcoin custody and key management practices. Knowledge of Infrastructure as Code security (Terraform, AWS CDK). Experience on user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture & The Ideal CandidateDemonstrates integrity, accountability, and the ability to work in a remote, high-growth environment. Has a builder’s mindset, seeks to create, iterate, and scale IS practices. Collaborates across functions with empathy and clarity. Enjoys remote work and thrives in a startup/tech culture. What Ledn ProvidesGrowth opportunities and a comprehensive rewards package from day one. Competitive PTO and equity ownership in the company. Remote-friendly policy—work remotely anywhere in the world for up to 180 days (subject to restrictions). A purpose-driven role in a company committed to inclusivity and diversity. Application NotesLedn is remote-first with a global team. We do not accept unsolicited agency resumes. We may request short video responses or review publicly available social media related to the role. We provide accommodation requests confidentially throughout the recruitment process. #J-18808-Ljbffr