Security Engineer

OverviewSecurity Engineers, Ledn is a global financial services company built for digital assets. We offer a suite of lending, savings and trading products to digital asset holders in over 150 countries. Our core values are integrity, ownership, passion for progress and empathy. 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. This role will drive both tactical improvements and long-term strategy for securing our applications and authentication systems. You will work across our JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices, and you will evolve our authentication layer toward modern, phishing-resistant approaches. You will also design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated environments. This is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. The OpportunityRole: Security Engineer (full-time) with deep expertise in Application Security, Identity & Access Management, and Confidential Computing. Key focus areas include securing our Bitcoin-backed loan platform and shaping the security roadmap across authentication and application security with a strong emphasis on modern, phishing-resistant MFA and enclave-based architectures. ResponsibilitiesApplication Security: lead secure design and code reviews; 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; partner with engineers to remediate vulnerabilities. Authentication & Identity: own the roadmap for authentication across customer and internal applications; enhance Cognito-based identity architecture with stronger MFA (WebAuthn, passkeys, hardware tokens); collaborate with Product to balance usability, compliance and security; define secure session management, device trust, and account recovery. Confidential Computing (AWS Nitro Enclaves): design enclave-based architectures to isolate sensitive workloads; integrate Nitro Enclaves with KMS and secure APIs; migrate high-value operations into enclave environments; ensure compliance and resilience of enclave workloads. Additional Security Domains: harden AWS services with least-privilege IAM and secure key management; improve Kubernetes security posture; deploy and operate a SIEM framework with detection rules and incident playbooks; support security controls and documentation for SOC 2 and ISO 27001. What You Bring To Ledn10 years minimum of proven experience in Application Security focused 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. 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; 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; ability to remediate vulnerabilities identified in penetration tests; strong communication and collaboration skills. 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 FitWe look for more than operational excellence—leadership who thrives in a startup or tech environment and embodies our values. The ideal candidate will be adaptable, resilient, collaborative, and able to influence across functions with empathy and clarity; demonstrate integrity and accountability, and have remote-work experience. The BenefitsComprehensive, best-in-class total rewards package starting on day one; competitive PTO; ownership in the company via equity; remote-work eligibility up to 180 days per year (subject to restrictions); a purpose-driven career. Equal OpportunityLedn is an equal opportunity employment organization committed to inclusivity and diversity. We welcome accommodations requests throughout all stages of the recruitment process and will address them confidentially. Please note: due to high volume of applications, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a video response and we may review publicly available social media activity relevant to the role. No agencies or recruiters, please. #J-18808-Ljbffr