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. Through our products & services, we can make a difference in the lives and futures of our clients - in real terms. Our team is a passionate group from diverse backgrounds with a shared conviction that digital assets can democratize access to the global economy. Our core values are: act with integrity always, own it, have a passion for progress, and lead with empathy. We are building, innovating and revolutionizing financial services, and we invite you to join us as we grow. 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. This role will drive both tactical improvements and long‑term strategy for securing our applications and authentication systems. 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. Remediate vulnerabilities and improve secure development practices in collaboration with engineers. 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). 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 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; 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 minimum of proven experience in Application Security focusing 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, able 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 value leaders who thrive in startup or tech environments and embody our values: progress, adaptability, resilience, and empathy. Builder's mindset to create, iterate, and scale security practices. Collaborative partner capable of influencing across functions and cultures with integrity and accountability, including in a remote environment. What We Provide Growth opportunities at one of the world’s leading digital asset companies. Comprehensive total rewards package starting on day one; competitive PTO. Equity ownership and remote work flexibility (up to 180 days globally, subject to restrictions). A role with purpose and a focus on removing barriers to doing meaningful work. Ledn is an equal opportunity employer; accommodation requests are welcome at any stage of the recruitment process. Ledn Working Environment: We are remote‑first with a global team across North America, Latin America, South Africa and Europe. Due to high application volume, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response and public social media review may be considered. No agencies or recruiters; unsolicited resumes will not be forwarded or accepted. Note All content reflects the original job description information provided. The description has been reformatted for clarity and accessibility. #J-18808-Ljbffr