Security Engineer

Overview 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. Ledn offers a suite of egalitarian lending, savings and trading products to digital asset holders in over 150 countries. Our team is diverse and focused on democratizing access to the global economy through our products and services. Our core values are: act with integrity always, own it, have a passion for progress, and lead with empathy. We are remote-first and globally distributed. 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. Security is fundamental to protecting customers and the business, and this role will drive tactical improvements and long-term strategy for securing applications and authentication systems. 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. This role also involves designing and operating 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. Responsibilities 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. Own the roadmap for authentication and identity across customer and internal applications. Enhance Cognito-based identity architecture with stronger MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). 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. Harden AWS services (Lambda, API Gateway, SQS, SNS) with least-privilege IAM and secure key management; improve Kubernetes security posture; deploy and operate a SIEM framework; support compliance initiatives (SOC 2, ISO 27001). What You Bring 10 years minimum 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, especially serverless architectures. Hands-on experience with AWS Nitro Enclaves for confidential computing. Deep understanding of authentication/authorization standards (OAuth2, OIDC, WebAuthn, FIDO2). Experience with Cognito / Auth0 (MFA, custom flows, secure session handling). Background in SIEM design and log correlation across cloud and application layers; Kubernetes security experience (RBAC, pod security, image scanning). Experience with Secure Code Review and understanding of software supply chain; strong Linux knowledge. Strong communication and collaboration skills 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). Experience on user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture & The Ideal Candidate We seek a leader who thrives in a startup/tech environment and embodies our values. Be adaptable, resilient, and comfortable navigating ambiguity in a high-growth setting. Have a builder’s mindset, a collaborative partner who can influence across functions with empathy and clarity. Operate with integrity and accountability, especially regarding confidential information across diverse contexts. Experience working in a remote environment. What We Provide Growth opportunities and a comprehensive total rewards package starting on day one. Competitive PTO and ownership in the company through equity. Remote-work flexibility up to 180 days per year (subject to restrictions). A purpose-driven career with barriers removed so you can love what you do. We are an equal opportunity employer and value inclusivity and diversity. You may contact the Ledn team for accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Ledn is a remote-first company with a global team. Due to high application volume, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response and we may review publicly available social media activity relevant to the role. No agencies or recruiters, please. We do not accept unsolicited agency resumes and are not responsible for fees related to them. Senior Security Engineer - Threat Detection • Lead Security Engineer - Incident Response #J-18808-Ljbffr