Security Engineer

Overview Join 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 around the world. Our team is diverse and committed to democratizing access to the global economy through Ledn\'s products and services. The core values guiding Ledn are: act with integrity always, own it, have a passion for progress, and lead with empathy. We combine these values with our conviction to drive meaningful change in the world of financial services. This is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. The role is full-time and focused on strengthening the security of Ledn\'s Bitcoin-backed loan platform. 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, 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. Design enclave-based architectures to isolate and protect sensitive workloads using AWS Nitro Enclaves. 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 (RBAC, pod security, image scanning, runtime monitoring). Deploy and operate a SIEM framework with 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 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 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. Deep understanding of Linux internals and remediation of vulnerabilities identified in penetration test reports. 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). Prior work on user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture Fit We\'re looking for a leader who thrives in startup or tech environments and embodies our values. The Ideal Candidate Will Have a passion for progress by being adaptable and resilient, comfortable navigating ambiguity in a high-growth, fast-paced environment. Have a builder\'s mindset, excited to create, iterate, and scale information security practices. Be a collaborative partner, able to influence across functions and cultures with empathy and clarity. Demonstrate integrity and accountability, especially in managing confidential information across diverse legal and cultural contexts. Have 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 and ownership in the company through shared equity. Remote-work opportunity for up to 180 days (subject to restrictions). A purposeful role that helps remove barriers and provides growth. We are an equal opportunity employment organization and value inclusivity, diversity, and the success that comes from diverse perspectives. You may reach out to the Ledn team for accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Ledn Working Environment: Ledn is global and remote-first, with team members across 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. We do not accept unsolicited agency resumes and are not responsible for any fees related to unsolicited resumes. Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Retail Referrals increase your chances of interviewing at LEDN by 2x Sign in to set job alerts for “Security Engineer” roles. We\u2019re unlocking community knowledge in a new way. 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