Security Engineer

Overview Security Engineer 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. We are a remote-first, global team with a culture that emphasizes integrity, ownership, progress, and empathy. Security is fundamental to protecting our customers and business. This role drives both tactical improvements and long-term strategy for securing applications and authentication systems across our JavaScript/TypeScript services, AWS serverless stack, MongoDB, and Kubernetes microservices. You will also design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations. The Opportunity / The Role Type: Full-time 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. Own the roadmap for authentication and identity across customer and internal applications. Enhance Cognito-based identity architecture with stronger MFA (WebAuthn, passkeys, hardware tokens). Define secure session management, device trust, and account recovery approaches. Design enclave-based architectures to isolate and protect sensitive workloads using AWS Nitro Enclaves; integrate with KMS and secure APIs. Migrate high-value operations into enclave environments and ensure compliance, auditability and resilience. 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 with detection rules, dashboards, and incident playbooks. Support compliance initiatives (SOC 2, ISO 27001) with security controls and documentation. What You Bring To Ledn 10+ years of proven experience in Application Security for web and cloud-native apps. 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 serverless architectures. Hands-on experience with AWS Nitro Enclaves for confidential computing. Deep understanding of authentication/authorization standards (OAuth2, OIDC, WebAuthn, FIDO2). 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 communication and collaboration skills 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 value leadership that thrives in startup/tech environments and embodies our values: act with integrity, own it, have a passion for progress, and lead with empathy. Desire to be adaptable, resilient, and able to navigate ambiguity in a high-growth setting. Collaborative, empathetic partner who can influence across functions and cultures. The Ideal Candidate Will Be passionate about progress, adaptable and comfortable with ambiguity. Have a builder's mindset to create, iterate, and scale IS practices. Demonstrate integrity and accountability with confidential information. Have experience working in a remote environment. What We Provide Comprehensive, best-in-class total rewards package starting from day one. Competitive PTO and ownership through equity for Ledn employees. Remote work option for up to 180 days per year (subject to restrictions). A purpose-driven career and a diverse, inclusive team. We are an equal opportunity employer and value inclusivity and diversity. You may contact the Ledn team for accommodation requests throughout all stages of the recruitment process. Requests will be handled confidentially. 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 we may review publicly available social media activity relevant to the role. No agencies or recruiters, please. We do not accept unsolicited resumes. #J-18808-Ljbffr