Staff Application Security Engineer

Overview Join to apply for the Staff Application 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. Through our products & services, we can make a difference in the lives and futures of our clients - in real terms. Our team at Ledn is a passionate group of individuals from diverse backgrounds. The core values that guide us are: act with integrity always, own it, have a passion for progress, and lead with empathy. Come join us as we build, innovate and revolutionize financial services The Opportunity We 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. Security 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. In addition, you will design and operate AWS Nitro Enclaves to protect critical data and cryptographic operations in isolated, verifiable environments. This is a hands-on engineering role with direct impact on product security, infrastructure security, and customer trust. What You Bring To Ledn 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. Understanding of software supply chain. Deep understanding of Linux internals. Remediate vulnerabilities identified in the penetration test report. 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, and is 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 Provide As one of the world's leading digital asset companies, we provide tremendous growth opportunities. Comprehensive, best-in-class total rewards package that starts on your first day We offer a competitive PTO package that ensures you have the time off you deserve. Ownership in the company through shared equity, Ledn employees are stakeholders in the company and the future of the digital economy. Remote work option up to 180 days per year (subject to restrictions). A career that provides you with purpose in your job. We remove barriers so you love what you do. We are an equal opportunity employment organization and pride ourselves on inclusivity, diversity, and the success that comes from diversity. You may reach out to the Ledn team by accommodation requests throughout all stages of the recruitment process. Requests will be addressed confidentially. Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Retail Referrals increase your chances of interviewing at LEDN by 2x Get notified about new Application Security Engineer jobs in Canoas, Rio Grande do Sul, Brazil . We’re unlocking community knowledge in a new way. Experts add insights directly into each article, started with the help of AI. #J-18808-Ljbffr