Security Engineer

Security Engineer at LEDN Join to apply for the Security Engineer role at LEDN . Security Engineers, 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 committed to democratizing access to the global economy through our products and services. About The Role 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, and this role will drive both 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 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. What You Will Do Application 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, and partner with engineers to remediate vulnerabilities. Authentication & Identity: Own the roadmap for authentication across customer and internal applications, enhance Cognito-based identity with stronger MFA solutions (WebAuthn, passkeys, hardware tokens), align usability, compliance, and security in authentication flows, and define secure session management and device trust approaches. 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, and ensure compliance, auditability 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, and support compliance initiatives (SOC 2, ISO 27001). What You Bring To Ledn Minimum 10 years 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 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 understanding of software supply chain. 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 with user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture Fit We’re looking for more than operational excellence — a leader who thrives in a startup/tech environment and embodies our values. The Ideal Candidate Will Have a passion for progress, adaptability and resilience in a high-growth, fast-paced environment. Have a builder’s mindset, ready to create, iterate, and scale IS practices. Be a collaborative partner, able to influence across functions and cultures with empathy and clarity. Demonstrate integrity and accountability when managing confidential information across diverse contexts. Have experience working in a remote environment. A Taste Of What We Provide Growth opportunities as LEDN is a leading digital asset company. Comprehensive total rewards package that starts on day one, including competitive PTO and equity ownership. Remote-friendly policy allowing work from anywhere in the world for up to 180 days per year (subject to restrictions). A purpose-driven career with barriers removed so you can do your best work. Equal Opportunity We are an equal opportunity employer and value inclusivity and diversity. We provide accommodations throughout all stages of the recruitment process upon request and will address requests confidentially. Ledn is a remote-first, global team with team members across North America, Latin America, South Africa and Europe. Please note, due to the high volume of applications, 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 resumes and are not responsible for any fees related to unsolicited resumes. #J-18808-Ljbffr