Security Engineer

Security Engineers, Ledn is interested in hearing from you Ledn is a global financial services company built for digital assets, helping to improve the everyday lives of Bitcoin holders while building generational wealth for the future. We offer a suite of egalitarian lending, savings and trading products to digital asset holders in over 150 countries and work to make a difference in the lives of our clients. The Opportunity 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. The role will drive both tactical improvements and long‑term strategy for securing our applications and authentication systems across our JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB, Kubernetes microservices, and beyond. About the Role 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 pipelines. 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 Cognito‑based identity architecture with phishing‑resistant MFA solutions such as WebAuthn and passkeys. Define secure approaches to session management, device trust, and account recovery. Design enclave‑based architectures to isolate and protect sensitive workloads using AWS Nitro Enclaves. Integrate Nitro Enclaves with KMS and secure APIs and 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 for 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 and software supply chain security. 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 Adaptable and resilient, thriving in a high‑growth, fast‑paced startup environment. Builder’s mindset, excited to create, iterate, and scale IS practices. Collaborative partner with empathy and clarity, able to influence across functions and cultures. Demonstrates integrity and accountability, especially when handling confidential information across diverse legal and cultural contexts. Has worked in a remote environment before. A Taste of What We Provide Comprehensive, best‑in‑class total rewards package that starts on your first day. Competitive PTO package to ensure you have the time off you deserve. Ownership in the company and shared equity, making you a stakeholder in the future of the digital economy. Remote work anywhere in the world for up to 180 days (subject to restrictions). Growth opportunities in a global, digital‑asset company that values inclusivity and diversity. Ledn is an equal opportunity employment organization and we pride ourselves on inclusivity, diversity, and the success that comes from diversity. We are committed to providing reasonable accommodations to all applicants in compliance with the Americans with Disabilities Act (ADA) and Title VI of the Civil Rights Act of 1964. Requests will be addressed confidentially and we will work with you to find a suitable solution. Requests for accommodation throughout all stages of the recruitment process will be addressed confidentially. #J-18808-Ljbffr