Job Description: Role Overview Key Responsibilities – Senior Windows API & Edge Extension Developer Develop Windows-based integration components using C#, .NET Core, Windows Services, Win32 APIs, and Windows Native Messaging.
Build and integrate secure REST APIs with support for API Keys, TLS/mTLS, certificate-based authentication, and secure communications.
Design solutions to process sensitive business data entirely in memory, ensuring no transaction data is written to disk, logs, or diagnostic files.
Implement robust error handling, retry mechanisms, timeout controls, status tracking, and resilience patterns for API interactions.
Develop and support multi-user Windows Server / Terminal Services environments supporting concurrent user sessions.
Configure and manage Windows security components including Certificate Store, DPAPI, service accounts, access controls, and secure secret management.
Ensure compliance with Secure SDLC, secure coding standards, vulnerability scanning, code reviews, and security remediation requirements.
Create and maintain HLD, LLD, deployment guides, operational runbooks, support documentation, and knowledge transfer materials.
Collaborate with customer architects, security teams, infrastructure teams,



and project stakeholders throughout the project lifecycle.
Support deployment, production stabilization, warranty support, troubleshooting, and defect resolution activities.
Package and deliver signed release artifacts, installation binaries, and deployment documentation for Windows Server environments.
Mandatory Skills Windows Server 2019/2022 Administration & Development (Mandatory)
Windows Terminal Services (RDS) Setting Management
C#, .NET Core / ASP.NET Core
Windows API / Win32 Development
Microsoft Edge Extension Development (Manifest V3)
Windows Native Messaging
REST API Development & Integration
TLS / mTLS / Certificate Management
Windows Security, DPAPI, Certificate Store
Secure SDLC & OWASP Secure Coding
Git/GitHub, CI/CD and Release Management
Unit, Integration and End-to-End Testing
Experience 8+ years of Software Development experience.
5+ years of Windows Server, Windows Platform and .NET Development.
Experience delivering secure enterprise solutions in Windows Server environments.
Strong troubleshooting, documentation, and customer-facing communication skills.

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📌 Windows Specialist (Ontario)
🏢 TechDoQuest
📍 Ontario