Application Security Engineering

Join to apply for the Application Security Engineering role at LEDN Staff Application 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. Our product suite includes egalitarian lending, savings and trading products available in over 150 countries. It is built on a modern, secure, and privacy‑respecting technology stack that empowers digital asset holders worldwide. Ledn is guided by core values: act with integrity always, own it, have a passion for progress, and lead with empathy. We believe digital assets can democratize access to the global economy and are committed to playing a critical role in that mission. Role OverviewWe are seeking a full‑time Staff Application 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 hands‑on engineering role will drive tactical improvements and long‑term strategy for securing our applications and authentication systems. ResponsibilitiesLead 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 pipelines. 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 existing Cognito‑based identity architecture with stronger, phishing‑resistant MFA solutions (e.g., WebAuthn, passkeys, hardware tokens). Define secure approaches to session management, device trust, and account recovery. Design enclave‑based architectures to isolate and protect sensitive workloads using AWS Nitro Enclaves. Integrate Nitro Enclaves with KMS and secure APIs. Migrate high‑value operations (e.g., cryptographic and financial processes) into enclave environments. Ensure compliance, auditability, and resilience of enclave workloads. 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. Qualifications10+ 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. Understanding of software supply chain. Deep understanding of Linux internals. 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. BenefitsWe offer a competitive PTO package, shared equity, and a comprehensive, best‑in‑class total rewards package that starts on your first day. You may work remotely anywhere in the world for up to 180 days. Equal OpportunityWe are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. Recruitment ProcessShortlisted candidates may be asked to submit a short video response and we may review publicly available social media activity relevant to the role. We do not accept unsolicited agency resumes and are not responsible for any fees related to unsolicited resumes. For accommodation requests throughout all stages of the recruitment process, please email ****** and requests will be addressed confidentially. #J-18808-Ljbffr