Senior Windows Developer

Job Description

Job Description: We are seeking a highly skilled Senior Windows Developer with expertise in authentication mechanisms, low-level Windows internals, and secure credential management. The ideal candidate will have extensive experience in developing authentication-based software and a deep understanding of Windows security architecture, authentication protocols, and driver-level programming. Key Responsibilities: Develop and maintain authentication-based software, focusing on secure credential management and Windows authentication mechanisms. Design and implement Windows authentication components such as Local Authentication Subsystem (LSA), Credential Providers, and Security Support Provider Interface (SSPI) . Work with Windows authentication protocols , including Kerberos, NTLM, OAuth, SAML, and Smart Card authentication . Develop and modify Windows Credential Providers to extend authentication functionality for login and enterprise security. Enhance and integrate authentication mechanisms with enterprise environments, including Active Directory (AD) and Azure AD. Utilize Windows API, LSA, and Win32 APIs to create robust authentication solutions. Develop and maintain Windows services, drivers, and system-level components to support authentication workflows. Perform security analysis and debugging of authentication mechanisms, working with debugging tools like WinDbg and Sysinternals Suite. Optimize authentication performance and security by implementing best practices in Windows security and cryptography. Ensure compatibility across various Windows versions and architectures, including 32-bit and 64-bit environments. Collaborate with security teams to ensure compliance with enterprise security standards and policies. Essential Skills & Experience: Extensive experience in Windows system programming , including knowledge of Windows internals and authentication subsystems. Strong proficiency in C, C++, C#, and .NET for Windows application and system development. In-depth understanding of Windows authentication mechanisms , including: LSASS (Local Security Authority Subsystem Service) Credential Providers (V1 & V2) Security Support Provider Interface (SSPI) Windows Biometric Framework (WBF) Expertise in authentication protocols : Kerberos NTLM OAuth SAML LDAP RADIUS FIDO2/WebAuthn Experience with Windows system security tools , including debugging and forensic analysis using WinDbg, Process Monitor, and Event Tracing for Windows (ETW). Experience in developing and troubleshooting Windows services, DLLs, and drivers . Knowledge of Windows security policies, encryption, and certificate-based authentication (PKI, Smart Cards, TPM, BitLocker) . Familiarity with Active Directory, Group Policy, and enterprise security best practices . Ability to analyze and reverse engineer security vulnerabilities in authentication workflows . Preferred Qualifications: Experience with Windows Kernel Development and Windows Filtering Platform (WFP) . Prior experience in developing Windows security products such as endpoint protection, identity management, or authentication solutions. Knowledge of PowerShell scripting and automation for security and system management.