Windows Systems Development Engineer

About InstaSafe

InstaSafe is a Zero Trust cybersecurity leader empowering enterprises to secure applications data and endpoints across hybrid and cloud environments. Our Zero Trust Network Access (ZTNA) Identity & Access Management (IAM) and Multi-Factor Authentication (MFA) solutions protect over 500000 endpoints globally including some of the worlds largest enterprises.

We are seeking a Windows Systems Engineer to design and develop security agents and authentication modules for Windows endpoints. This includes the ISA Windows Agent ZTA Windows Agent Windows Credential Provider and Windows MFA integrations which are key to enforcing Zero Trust access on enterprise desktops and servers.

The Windows Systems Engineer will build low-level Windows system agents and authentication components that interact directly with Win32 APIs Windows Registry Active Directory APIs and Windows Credential Providers.

This role requires deep experience with C/C/C# Windows Service development and secure integration into Windows authentication and networking layers.

Duties & Responsibilities

• Agent Development: Design and maintain Windows endpoint agents that enforce Zero Trust access policies.
  

• Authentication Integration: Implement and extend Windows Credential Provider APIs Active Directory APIs and MFA workflows (RADIUS LDAP AD).
  

• Service Development: Build and manage Windows Services that run securely in enterprise environments.
  

• Networking & Security: Integrate with VPN/ZTNA protocols (OpenVPN IPSec) and ensure secure communication using TLS/SSL.
  

• System-Level Work: Work with Windows Registry COM Interfaces and packaging/distribution using MSI installers.
  

• Debugging & Troubleshooting: Use advanced debugging tools (WinDbg Process Explorer SysInternals suite).
  

• Cross-Platform Collaboration: Work with Linux/Mac agent teams to ensure consistent features across platforms.
  

• Continuous Improvement: Stay current with Windows security advancements hardening practices and APIs.
  
  

Requirements

Qualifications & Skills

Education & Experience:

• Bachelors/Masters degree in Computer Science Engineering or equivalent.
  

• 47 years experience in Windows system-level programming.
  

Core Technical Skills (with links for TA reference):

• C Programming / C / C#
  

• Win32 APIs
  

• Windows Service Development
  

• Windows Registry Programming
  

• Active Directory APIs
  

• Windows Credential Provider APIs
  

• COM Interfaces
  

• MSI Packaging
  

• OpenVPN / IPSec integration
  

• Debugging with WinDbg SysInternals
  

Preferred/Good-to-Have:

• Experience with Windows MFA SDKs and RADIUS/LDAP integrations.
  

• Familiarity with Azure AD/Entra ID APIs for modern authentication.
  

• Experience with endpoint security software or VPN clients.
  

• Exposure to Agile/CI/CD development workflows.
  

Benefits

Career Value Proposition

• Build mission-critical Windows agents used in enterprise environments worldwide.
  

• Work directly with core Windows authentication flows to deliver cutting-edge Zero Trust solutions.
  

• Collaborate with top engineers across security networking and OS platforms.
  

• Gain expertise in enterprise-grade Windows security engineering.