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 500,000 endpoints globally, including some of the world’s 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:

• Bachelor’s/Master’s degree in Computer Science, Engineering, or equivalent.



• 4–7 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
  .