Security Engineer

Overview Join to apply for the Security Engineer role at LEDN . LEDN is a global financial services company built for digital assets, offering lending, savings and trading products to digital asset holders in over 150 countries. The team is committed to using digital assets to democratize access to the global economy. The role is a full-time position focusing on security across applications, identity and access management, and confidential computing, with hands-on engineering impact on product and infrastructure security. The Opportunity Responsibilities center on strengthening the security of our Bitcoin-backed loan platform, working across JavaScript/TypeScript services, an AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB, and Kubernetes microservices. You will evolve the authentication layer toward modern, phishing-resistant approaches and design and operate AWS Nitro Enclaves to protect sensitive data and cryptographic operations. This is a hands-on role with direct impact on product security, infrastructure security, and customer trust. 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 with engineering partners. Own the roadmap for authentication and identity across customer and internal applications. Enhance Cognito-based identity with MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). Collaborate with Product on usability, compliance, and security in authentication flows. Define secure session management, device trust, and account recovery approaches. 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 and ensure compliance, auditability, and resilience. Harden AWS services with least-privilege IAM and secure key management; improve Kubernetes security posture; deploy and operate a SIEM; support SOC 2 / ISO 27001 controls. What You Bring To Ledn 10+ years of proven experience in Application Security focusing on web and cloud-native apps. 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). 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, image scanning). Experience with Secure Code Review and software supply chain. Strong Linux knowledge; ability to remediate vulnerabilities from pen tests. Strong communication and cross-functional collaboration skills. 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 Leadership mindset, adaptability, resilience, and a collaborative, empathetic approach. Experience working in remote environments and thriving in startup/tech contexts. The Ideal Candidate Will Demonstrate progress-mindedness, adaptability, and comfort with ambiguity in a high-growth setting. Be a builder, capable of creating, iterating, and scaling security practices. Influence across functions with integrity and accountability, including handling confidential information. Have remote-working experience. A Taste Of What We Provide Growth opportunities at a leading digital asset company. Comprehensive total rewards, competitive PTO, and company ownership through equity. Remote-work flexibility up to 180 days globally (with restrictions). A purpose-driven career and a commitment to removing barriers to doing great work. Equal opportunity employer promoting inclusivity and diversity. Note: Ledn may request accommodation. Shortlisted candidates may be asked to submit a short video response or have publicly available social media reviewed. No agencies or recruiters. We do not accept unsolicited resumes. #J-18808-Ljbffr