Senior Software Engineer- Windows (Duo)

Cisco is a technology company developing solutions that connect and protect organizations across digital environments. The Senior Software Engineer will design, implement, and harden Windows endpoint authentication components and enterprise integrations for Zero Trust security, while developing diagnostic tools, partnering on architecture and testing, and mentoring engineers.

Responsibilities:

• Design and implement high-performance, memory-safe endpoint authentication components and enterprise integrations using Modern C++ (C++17/20) and native Win32 APIs to deliver resilient Zero Trust security at operating system logon
• Lead the technical design and hardening of custom Windows Credential Providers, ADFS MFA adapters, and WTS multi-session services to eliminate authentication latency and prevent credential bypass attacks
• Develop automated diagnostic utilities and robust administrative tooling using PowerShell and WMI/CIM to streamline enterprise-scale deployment and enhance sysadmin manageability
• Partner closely with Product Management, Security Architecture, and Design to author Architectural Decision Records (ADRs) and establish comprehensive automated test pipelines to guarantee zero-regression releases
• Mentor peer engineers through insightful code reviews and technical guidance to foster engineering excellence and accelerate team delivery velocity

Requirements:

• Bachelor's degree in computer science, computer engineering, or a related technical field (or equivalent practical experience)
• 6+ years of professional systems software engineering experience using Modern C++ (C++14/17/20) or C
• Experience developing native Windows desktop or server applications using Win32 APIs, multi-threading synchronization primitives, and IPC
• Experience administering or integrating with on-premises Active Directory (AD DS), Kerberos authentication protocols, or Windows Server environments
• Experience authoring PowerShell scripts or utilizing WMI/CIM for Windows system automation, configuration, and troubleshooting
• Direct experience developing custom Windows Credential Providers, LSA authentication packages, or Active Directory Federation Services (ADFS) MFA adapters
• Hands-on experience debugging user-mode crashes, race conditions, and deadlocks using WinDbg, ETW tracing, or Visual Studio diagnostic tools
• Experience authoring enterprise MSI installer customizations, Group Policy Administrative Templates (.admx/.adml), or GPO deployment workflows
• Familiarity with modern authentication protocols, FIDO2/WebAuthn, Passwordless logon architectures, or Microsoft Entra ID (Azure AD) hybrid join
• Demonstrated technical leadership experience authoring Architectural Decision Records (ADRs), conducting structured code reviews, and mentoring fellow engineers