Staff Application Security Engineer

OverviewJoin to apply for the Staff Application 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. Ledn offers a suite of egalitarian lending, savings and trading products to digital asset holders in over 150 countries. Our team is diverse and we share a conviction that digital assets can democratize access to the global economy. We value integrity, accountability, progress, and empathy. We are seeking a full-time Staff Application 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 is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. ResponsibilitiesLead 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 (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; develop detection rules, dashboards, and incident playbooks. Support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. What You Bring To Ledn10 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. Understanding of software supply chain. Deep understanding of Linux internals. Remediate vulnerabilities identified in the penetration test report. Strong communication and collaboration skills, able to influence engineering and product teams. Nice To HavesFamiliarity 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 FitWe are looking for a leader who thrives in a startup or tech environment and embodies our values. Have a passion for progress by being adaptable and resilient, and navigate ambiguity in a high-growth, fast-paced environment. Be a builder with a mindset to create, iterate, and scale security practices. Collaborate across functions and cultures with empathy and clarity; demonstrate integrity and accountability in handling confidential information. Experience working in a remote environment. The Ideal Candidate WillBe adaptable, resilient, and comfortable navigating ambiguity in a fast-paced environment. Have a builder’s mindset to create, iterate, and scale security practices. Be a collaborative partner who can influence across functions with empathy and clarity. Demonstrate integrity and accountability, especially for confidential information across diverse contexts. Have remote-work experience. A Taste Of What We ProvideGrowth opportunities at a leading digital asset company. Comprehensive rewards package starting on day one. Competitive PTO and ownership in the company via shared equity. Ability to work remotely from anywhere in the world for up to 180 days (subject to restrictions). A role that provides purpose and removes barriers to doing your best work. We are an equal opportunity employer that values inclusivity and diversity. You may reach out to the Ledn team for accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Seniority levelMid-Senior level Employment typeFull-time Job functionInformation Technology IndustriesRetail Referrals increase your chances of interviewing at LEDN by 2x Sign in to set job alerts for “Application Security Engineer” roles.We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr