Security Engineer

OverviewJoin to apply for the Security Engineer role at LEDN . 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. Our team is diverse and committed to democratizing access to the global economy through Ledn’s products and services. The core values are: act with integrity, own it, have a passion for progress, and lead with empathy. We are building, innovating and revolutionizing financial services. 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 our customers and business, and 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 take ownership of evolving 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. About The Role 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 Cognito-based identity architecture with stronger, phishing-resistant MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). 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 (cryptographic and financial processes) 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 To Ledn 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, especially serverless architectures. Hands-on experience with AWS Nitro Enclaves for confidential computing. Deep understanding of authentication/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 Linux internals knowledge. Ability to remediate vulnerabilities identified in penetration tests. 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 seek a leader who thrives in startup/tech environments and embodies our values. We value adaptability, resilience, collaboration, empathy and integrity. Experience working in remote environments is a plus. The Ideal Candidate Will Be adaptable, resilient and comfortable navigating ambiguity in a high-growth environment. Have a builder's mindset 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 in handling confidential information. Have worked in a remote environment before. A Taste Of What We Provide Growth opportunities at Ledn, a leading digital asset company. Competitive total rewards package starting on day one, including PTO and ownership through equity. Remote work globally up to 180 days (subject to restrictions). A career with purpose and a culture that removes barriers to doing great work. We are an equal opportunity employer and value diversity and inclusion. Accommodation requests are confidentially addressed at any stage of recruitment. Ledn is remote-first with a global team spanning North America, Latin America, South Africa and Europe. Please note that due to 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. #J-18808-Ljbffr