Staff Application Security Engineer

OverviewStaff Application Security Engineer at LEDNAbout the RoleThis role focuses on Application Security, Authentication & Identity, and Confidential Computing to secure LEDN's Bitcoin-backed loan platform.It is a hands-on engineering position that directly impacts 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 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 (AWS Nitro Enclaves).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.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 *****) with security controls and documentation.Qualifications10 years minimum 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, 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 want a leader who thrives in a startup or tech environment, embodies our values, and is comfortable navigating ambiguity in a high-growth, fast-paced setting.The ideal candidate will demonstrate integrity, accountability, and remote experience.BenefitsComprehensive, best-in-class total rewards package that starts on your first day.Competitive PTO, ownership via shared equity, and the opportunity to work remotely anywhere for up to 180 days.Equal OpportunityWe are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity.For accommodation requests throughout all stages of the recruitment process, requests will be addressed confidentially.Seniority levelMid-Senior levelEmployment typeFull-timeJob functionInformation TechnologyRetailLocationMato Grosso, BrazilReferralsReferrals increase your chances of interviewing at LEDN by 2x.#J-*****-Ljbffr