Security Engineer

OverviewSecurity Engineer with deep expertise in Application Security, Identity & Access Management, and Confidential Computing to strengthen the security of Ledn's Bitcoin-backed loan platform. Security is fundamental to protecting customers and the business, and this role will drive both tactical improvements and long-term strategy for securing applications and authentication systems. 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 group from diverse backgrounds, united by the conviction that digital assets can democratize access to the global economy. Our core values are: act with integrity always, own it, have a passion for progress, and lead with empathy. We are a remote-first environment with global teams and offer opportunities to work remotely from anywhere in the world for up to 180 days (subject to restrictions). Responsibilities Work across JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices; evolve authentication layer toward modern, phishing-resistant approaches. Design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated, verifiable environments. Lead secure design and code reviews; 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. Remediate vulnerabilities and improve secure development practices in partnership with engineering teams. Own the roadmap for authentication and identity across customer and internal applications; enhance Cognito-based identity architecture with stronger MFA solutions (e.g., 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. 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 27001). What You Bring To Ledn / Qualifications 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. 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; strong Linux internals knowledge. Strong communication and collaboration skills, able to influence 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’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 Have a passion for progress by being 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 Growth opportunities within Ledn, a leading digital asset company. Comprehensive total rewards package starting on day one; competitive PTO and remote work options. Ownership in the company through shared equity; opportunity to work remotely up to 180 days per year (subject to restrictions). Additional Information We are an equal opportunity employment organization and value inclusivity and diversity. Due to high volume of applications, only qualified applicants will be contacted. Shortlisted candidates may be asked to submit a short video response and the review of publicly available social media activity may occur relevant to the role. No agencies or recruiters; we do not accept unsolicited agency resumes. #J-18808-Ljbffr