Security Engineer

Overview Join to apply for the Security Engineer role at LEDN . Security Engineers at Ledn focus on strengthening security across our Bitcoin-backed loan platform and related services. 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. The core values guide us: act with integrity always, own it, have a passion for progress, and lead with empathy. Come join us as we build, innovate and revolutionize financial services. The Opportunity 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. Security is fundamental to protecting our customers and business, and this role will drive both the tactical improvements and long-term strategy for securing our applications and authentication systems. You will work across our JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices, and take ownership of evolving our authentication layer toward modern, phishing-resistant approaches. In addition, you will design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated, verifiable environments. This is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. Responsibilities 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 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 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. What You Bring To Ledn 10 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 and understanding of software supply chain. Deep understanding of Linux internals; Remediate vulnerabilities identified in penetration tests. Strong communication and collaboration skills to influence across 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. Culture Fit We look for a leader who thrives in startup/tech environments and embodies our values, not just operational excellence. The Ideal Candidate Will Be adaptable, resilient, and comfortable navigating ambiguity in a high-growth, 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 when handling confidential information across diverse contexts. Have experience working in a remote environment. A Taste Of What We Provide Growth opportunities as Ledn is a leading digital asset company. Comprehensive total rewards package starting on day one; competitive PTO; ownership via shared equity. Remote-friendly policy allowing up to 180 days remote work (subject to restrictions). A role with purpose and a culture that removes barriers to doing great work. Equal opportunity employer; we value inclusivity and diversity. You may reach out to the Ledn team by ****** accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Ledn Working Environment: We are truly global, remote-first, with team members across North America, Latin America, South Africa and Europe. Please note, due to high volume of applications, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response and a review of publicly available social media relevant to the role. No agencies or recruiters. We do not accept unsolicited agency resumes. Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Retail Referrals increase your chances of interviewing at LEDN by 2x Get notified about new Security Engineer jobs in Tubarão, Santa Catarina, Brazil. 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