Staff Application Security Engineer

Staff Application Security EngineerJoin 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.We offer a suite of egalitarian lending, savings, and trading products to digital asset holders in over 150 countries around the world.The OpportunityWe 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.Responsibilities include: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 existing 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 Nitro Enclaves with KMS and secure APIs.Upgrade high-value operations into enclave environments.Harden AWS services 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 *****) with security controls and documentation.What You Bring to Ledn10+ years 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.Expertise with AWS security best practices, particularly in serverless architectures.Hands-on experience with AWS Nitro Enclaves.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.Strong communication and collaboration skills.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 value integrity, passion for progress, leadership with empathy, and a builder's mindset.We seek candidates who thrive in a startup or tech environment, are adaptable, and can influence across functions.BenefitsWe offer a comprehensive, best-in-class total rewards package that starts on your first day, competitive PTO, equity, and the ability to work remotely anywhere in the world for up to 180 days.Equal Opportunity StatementWe are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity.Accommodation requests are addressed confidentially throughout all stages of the recruitment process.Additional InformationPlease note, due to the high volume of applications, only those applicants that qualify will be contacted.No agencies or recruiters, please.We do not accept unsolicited agency resumes and we are not responsible for any fees related to unsolicited resumes.Seniority LevelMid-Senior levelEmployment TypeFull-timeJob FunctionInformation Technology; RetailReferrals increase your chances of interviewing at LEDN by 2x.#J-*****-Ljbffr