Security Engineer

Overview Security Engineers, 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. Ledn offers a suite of egalitarian lending, savings and trading products to digital asset holders in over 150 countries. Our team is a diverse group united by the conviction that digital assets can democratize access to the global economy, and Ledn’s products & services can play a critical role in doing so. Our core values are integrity, accountability, progress, and empathy. We are building, innovating and revolutionizing financial services and invite you to join us. 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 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. You will also 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. What You Will Do 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 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 with detection rules, dashboards, and incident playbooks; support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. What You Bring To Ledn Minimum 10 years 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; ability to remediate vulnerabilities identified in penetration test reports. Strong communication and collaboration skills, able to influence engineering and product teams. Nice To Have Familiarity with Bitcoin custody and key management practices. Knowledge of Infrastructure as Code security (Terraform, AWS CDK). Experience on user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture Fit We’re looking for more than just operational excellence — we want a leader who thrives in the startup or tech environment and embodies our values. The Ideal Candidate Will Be adaptable and resilient, comfortable navigating ambiguity in a high-growth, fast-paced environment. Have a builder's mindset, excited to create, iterate, and scale information security practices. Be a collaborative partner, able to influence across functions and cultures with empathy and clarity. Demonstrate integrity and accountability, especially in managing confidential information across diverse legal and cultural contexts. Have worked in a remote environment before. A Taste Of What We Provide Comprehensive, best-in-class total rewards package that starts on your first day. Competitive PTO package and ownership in the company through shared equity. Remote-friendly: work remotely anywhere in the world for up to 180 days (subject to restrictions). A career that provides you with purpose and removes barriers to doing your best work. We are an equal opportunity employer and value inclusivity and diversity. You may reach out with accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Ledn is a remote-first environment with a globally distributed team across North America, Latin America, South Africa and Europe. Due to high application volume, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response, and we may review publicly available social media activity relevant to the role. No agencies or recruiters please; we do not accept unsolicited agency resumes and are not responsible for fees related to unsolicited resumes. #J-18808-Ljbffr