Senior OS Logon & Zero-Trust Authentication Engineer

Cisco; Austin (TX); On-site; USD 139,000 - 204,000; Full time

Job summary

Cisco Duo’s Zero Trust OS Logon & Enterprise Applications team designs and engineers low‑level authentication software that secures Windows and macOS endpoints across thousands of global organizations. We work at the frontline of Zero Trust access, delivering passwordless logon and resilient MFA across Active Directory environments and cloud identity providers.

Join a tight-knit, collaborative engineering squad that values rigor and pragmatic problem‑solving.

Qualifications

• 6+ years of professional systems software engineering using Modern C++ or C.
• Experience with native Windows desktop/server apps using Win32 APIs and IPC.
• Experience with AD DS, Kerberos or Windows Server environments.
• PowerShell scripting and Windows automation with WMI/CIM.

Responsibilities

• Design high‑performance, memory‑safe endpoint authentication components.
• Hardening of Windows Credential Providers and ADFS MFA adapters.
• Develop tooling for enterprise deployment and admin management.
• Collaborate with Product, Security, and Design to ADRs and test pipelines.
• Mentor engineers through code reviews and technical guidance.

Skills

6+ years systems software

Modern C++ (C++14/17/20)

Win32 API

PowerShell

Multi-threading/IPC

AD DS/Kerberos

Education

Bachelor's degree in CS/CE or related field

Tools

Win32 APIs

WMI/CIM

ETW/WinDbg

MSI installer customization

Job description

Cisco Duo’s Zero Trust OS Logon & Enterprise Applications team designs and engineers low‑level authentication software that secures Windows and macOS endpoints across thousands of global organizations. We work at the frontline of Zero Trust access, delivering passwordless logon and resilient MFA across Active Directory environments and cloud identity providers.

Join a tight-knit, collaborative engineering squad that values rigor and pragmatic problem‑solving.