Security Engineer

Overview Security Engineers, Ledn is 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 role drives both tactical improvements and long-term strategy for securing applications and authentication systems. Ledn is a global financial services company focused on digital assets, offering lending, savings and trading products in over 150 countries. We value integrity, ownership, progress, and empathy, and we are committed to democratizing access to the global economy through our products and services. The Opportunity This hands-on engineering role covers JavaScript/TypeScript services, AWS serverless stack (Lambda, API Gateway, Cognito, SNS, SQS), MongoDB and Kubernetes microservices. You will evolve our authentication layer toward modern, phishing-resistant approaches and design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated environments. You will have direct impact on product security, infrastructure security, and customer trust. What Youll Do / Responsibilities 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 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 approaches. Design enclave-based architectures to isolate and protect sensitive workloads (AWS Nitro Enclaves). Integrate Nitro Enclaves with KMS and secure APIs; migrate high-value operations into enclave environments. 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) with security controls and documentation. What You Bring To Ledn / Qualifications 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. 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). Experience with user-facing security features such as passwordless authentication, recovery flows, or device trust. Culture Fit We’re looking for a leader who thrives in startup or tech environments 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 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 contexts. Have experience working in a remote environment. A Taste Of What We Provide Growth opportunities within Ledn as a leading digital asset company. Comprehensive total rewards package starting from day one. Competitive PTO and ownership in the company through shared equity. Remote work from anywhere in the world for up to 180 days (subject to restrictions). A purpose-driven career and a culture that removes barriers to doing great work. Equal Opportunity and Logistics Ledn is an equal opportunity employer and values diversity and inclusion. Accommodation requests during recruitment are confidentially addressed. We are a remote-first team with a global presence across North America, Latin America, South Africa, and Europe. 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; unsolicited resumes will not be accepted. #J-18808-Ljbffr