Tarun Sundan is a software engineer with over 18 years of experience designing and leading secure, large-scale enterprise platforms, with deep specialization in Identity and Access Management (IAM) and modern digital authentication. A significant portion of his work has focused on building and operating authentication systems that perform reliably at scale while meeting strict security, regulatory, and operational requirements.
His primary area of expertise is enterprise IAM modernization and passwordless authentication. He has led the design and evolution of authentication platforms supporting tens of millions of users, covering authentication and authorization flows, directory integrations, federated identity, and access governance. He has played a key role in transitioning legacy, password-based systems to passwordless authentication using FIDO2 and passkeys, addressing practical challenges such as user onboarding, credential lifecycle management, authentication assurance levels, and risk alignment.
From an implementation standpoint, he has designed high-throughput authentication services using Java and Spring Boot, optimized data layers with Cassandra NoSQL, and implemented automated testing and CI/CD practices to ensure platform stability. Over time, he moved into roles with greater technical ownership and leadership responsibility, consistently applying principles of scalability, security, and maintainability from enterprise portals to modern, passwordless identity platforms operating at global scale.