Security Engineer

OverviewJoin to apply for the 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 egalitarian lending, savings and trading products to digital asset holders in over 150 countries around the world. Our team is a passionate, diverse group guided by values of integrity, ownership, progress, and empathy. 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 is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. The OpportunitySecurity 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. You will design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated, verifiable environments. Responsibilities, at a high level, include leading secure design and code reviews, defining secure coding practices, automating vulnerability detection in CI/CD, threat modeling, and partnering with engineers to remediate vulnerabilities. You will also own authentication and identity roadmaps across customer and internal applications, enhance Cognito-based identity architecture with stronger MFA solutions (e.g., WebAuthn, passkeys, hardware tokens), and collaborate with Product on usable, compliant authentication flows. Additional security domains include hardening AWS services, improving Kubernetes security posture, deploying and operating a SIEM, and supporting compliance initiatives (SOC 2, ISO 27001). What You Bring To Ledn10 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 and vulnerability remediation from penetration tests. Strong communication and collaboration skills 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 are 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 WillHave a passion for progress by being adaptable and resilient, and comfortable navigating ambiguity in a high-growth, fast-paced environment. Have a builder's mindset, excited to create, iterate, and scale IS 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 ProvideAs one of the world's leading digital asset companies, we provide tremendous growth opportunities with a comprehensive rewards package starting on your first day. We offer competitive PTO, equity ownership, remote-friendly policy (up to 180 days remotely, subject to restrictions), and a purpose-driven career. Ledn is committed to inclusivity and equal opportunity employment; we welcome applicants from diverse backgrounds. You may reach out to the Ledn team with accommodation requests throughout all stages of the recruitment process. Requests will be handled confidentially. Working EnvironmentLedn is truly global, with a remote-first environment and teams spanning North America, Latin America, South Africa and Europe. Please note: 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, and unsolicited resumes are not accepted. Seniority level: Mid-Senior level Employment type: Full-time Job function: Information Technology Industries: Retail #J-18808-Ljbffr