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. The 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. 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 applications and authentication systems. It is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. Responsibilities 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 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 (e.g., 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 Minimum of 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. Deep understanding of Linux internals and vulnerability remediation. 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 are looking for more than operational excellence — we want a leader who thrives in a startup/tech environment and embodies our values. The ideal candidate will be adaptable, resilient, collaborative, and able to navigate ambiguity in a high-growth, fast-paced environment. They will have a builder's mindset, enjoy creating and scaling IS practices, and demonstrate integrity and accountability, especially in handling confidential information across diverse legal and cultural contexts. Experience working in a remote environment is a plus. What We Provide As a leading digital asset company, we offer tremendous growth opportunities, a comprehensive total rewards package starting on day one, a competitive PTO package, and equity ownership in the company. We support remote work globally for up to 180 days (subject to restrictions). We aim to provide a role with purpose and remove barriers so you love what you do. We are an equal opportunity employer and strive for inclusivity and diversity. For accommodation requests throughout the recruitment process, you may reach out to the Ledn team at the provided contact. 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. Ledn Working Environment: Our team is truly global and remote-first, spanning North America, Latin America, South Africa and Europe. Note: due to high application volume, only qualified applicants will be contacted. #J-18808-Ljbffr