Security Engineer

Overview Ledn, a global financial services company built for digital assets, is looking for a full‑time Security Engineer to strengthen the security of our Bitcoin‑backed loan platform. Opportunity As a Security Engineer, you will work across our JavaScript/TypeScript services, AWS serverless stack, MongoDB and Kubernetes microservices and own the authentication layer and confidential computing strategy. Application Security 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. Authentication & Identity Own the roadmap for authentication and identity across customer and internal applications. Enhance existing Cognito‑based identity architecture with stronger, phishing‑resistant MFA solutions. Collaborate with product to align usability, compliance, and security in authentication flows. Define secure approaches to session management, device trust, and account recovery. Confidential Computing (AWS Nitro Enclaves) 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. Additional Security Domains 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 10+ years of proven experience in Application Security focused on web and cloud‑native applications. Strong knowledge of JavaScript/TypeScript/Golang/Python and modern web vulnerabilities. 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. Remediate vulnerabilities identified in the penetration test report. Strong communication and collaboration skills, able to influence engineering and product teams. 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 Passion for progress and adaptability in a high‑growth, fast‑paced environment. Builder's mindset and excitement to scale IS practices. Collaborative partner influencing across functions with empathy and clarity. Integrity and accountability, especially in managing confidential information. Experience working remotely. What We Provide Comprehensive total rewards package that starts on your first day. Competitive PTO package. Ownership and shared equity. Remote work up to 180 days with flexibility worldwide. Purpose‑driven career and inclusive culture. Equal Opportunity Employment Ledn is an equal opportunity employment organization and prides itself on inclusivity, diversity, and the success that comes from diversity. For accommodation requests throughout all stages of the recruitment process, please contact us. Requests will be addressed confidentially. #J-18808-Ljbffr