Security Engineer

OverviewSecurity 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. We are seeking a full time 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 both tactical improvements and long-term strategy for securing our applications and authentication systems. ResponsibilitiesApplication 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 Cognito-based identity architecture with stronger, phishing-resistant MFA solutions (e.g., 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 into enclave environments. Ensure compliance, auditability, and resilience of enclave workloads. Additional Security Domains: Harden AWS services with least-privilege IAM and secure key management; Improve Kubernetes security posture; Deploy and operate a SIEM framework; Support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. Qualifications10 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, image scanning). Experience with Secure Code Review and understanding of software supply chain. Deep understanding of Linux internals; ability to remediate vulnerabilities identified in penetration test reports. 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’re looking for a leader who thrives in startup or tech environments and embodies our values: act with integrity, own it, have a passion for progress, and lead with empathy. Builds, iterates, and scales information security practices; collaborates across functions and cultures with empathy and clarity; demonstrates integrity and accountability for confidential information. Experience working in a remote environment is valued. A Taste Of What We ProvideGrowth opportunities within a leading digital asset company. Comprehensive total rewards package starting from day one. Competitive PTO and remote-friendly work arrangement (up to 180 days remote, subject to restrictions). Equity participation; employees are stakeholders in the company. Remote-first environment with global teams. Equal opportunity employer; accommodations available during recruitment; privacy of requests respected. Referrals increase your chances of interviewing at LEDN. You may receive notifications about new Security Engineer jobs in Betim, Minas Gerais, Brazil. #J-18808-Ljbffr