Security Engineer

OverviewSecurity Engineer role at LEDN. Ledn is a global financial services company focused on digital assets, offering lending, savings and trading products in over 150 countries. 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. This is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. You will work across JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices, and will evolve our authentication layer toward modern, phishing-resistant approaches. You will design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated environments. 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 authentication and identity roadmap across customer and internal applications. Enhance Cognito-based identity architecture with stronger MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). Define secure session management, device trust, and account recovery approaches. Design enclave-based architectures to isolate and protect sensitive workloads and migrate high-value operations into enclave environments. Ensure compliance, auditability, and resilience of enclave workloads. Harden AWS services and improve Kubernetes security posture; deploy and operate a SIEM framework with detection rules and incident playbooks. Support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. Qualifications10 years minimum of proven experience in Application Security with 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, especially 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, image scanning). Experience with Secure Code Review and understanding of software supply chain. Deep understanding of Linux internals; remediation of vulnerabilities from penetration tests. Strong communication and collaboration skills; able to influence across engineering and product teams. Nice to HaveFamiliarity with Bitcoin custody and key management practices. Knowledge of Infrastructure as Code security (Terraform, AWS CDK). Experience on user-facing security features (passwordless authentication, recovery flows, device trust). Culture & FitWe value leadership, adaptability, and a builder mindset. The ideal candidate thrives in a startup/tech environment, collaborates across functions with empathy and clarity, maintains integrity and accountability for confidential information, and has remote-work experience. What We ProvideCompetitive total rewards package and comprehensive benefits; ownership in the company through equity. Remote-friendly policy; opportunity to work remotely up to 180 days per year (subject to restrictions). Purpose-driven work removing barriers so you can succeed. Inclusive, diverse workplace; LEDN is an equal opportunity employer. Accommodation requests may be emailed to the LEDN team during recruitment. About LEDN & EnvironmentLEDN is global, remote-first, with team members across North America, Latin America, South Africa, and Europe. Due to high application volume, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response; we may review publicly available social media activity relevant to the role. No agencies or recruiters please. #J-18808-Ljbffr