Staff Application Security Engineer

Join 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 equitable lending, savings, and trading products to digital asset holders in over 150 countries. Our team is a passionate group from diverse backgrounds, united by a conviction that digital assets can democratize access to the global economy. Opportunity 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 role will drive tactical improvements and long‑term strategy for securing our applications and authentication systems. About the Role 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 existing 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. 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 (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 10 years of proven experience in Application Security focused on web and cloud‑native applications. Strong knowledge of JavaScript/TypeScript/Golang/Python and modern web vulnerabilities (OWASP Top 10). 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, software supply‑chain security, and Linux internals. 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. Experience with remote‑first environments. Culture Fit We value adaptability, resilience, and a builder’s mindset. Candidates should thrive in a high‑growth, fast‑paced startup environment, influence across functions with empathy, and demonstrate integrity and accountability when handling confidential information. Benefits We offer a competitive total rewards package, including PTO, equity, remote opportunities, and a culture that supports growth, purpose, and inclusivity. Seniority Level Mid‑Senior level Employment Type Full‑time Job Function Information Technology Industries Retail J-18808-Ljbffr

Location: Rio de Janeiro, Rio de Janeiro, BR

Posted Date: 11/2/2025