Cybersecurity Windows Service Engineer (C#/.NET)

SKY VC; Orlando, Northern (FL, KY); Hybrid; USD 110,000 - 170,000; Full time

Job summary

ThreatLocker is seeking a Windows Service Developer to design, implement, and optimize high-performance background services in C#/.NET, with a focus on Windows OS internals. This in-office role is based in Orlando, FL, and requires depth in Windows architecture and secure coding practices.

You will work on the core endpoint protection platform, collaborating with system internals, file systems, and network layers to build scalable, secure service components.

Qualifications

• Expert-level proficiency in C#/.NET Framework and .NET Core with async programming and multithreading.
• Strong understanding of Windows internals: services, registry, process lifecycle, and kernel-level concepts.
• Solid grasp of network protocols (TCP/IP, HTTP/S, DNS) and firewall-level filtering.
• Hands-on experience with debugging/profiling tools (WinDbg, Process Monitor).
• Familiarity with SQL Server, including stored procedures and index optimization.
• Experience designing and consuming RESTful APIs.
• Strong understanding of secure coding practices and software design patterns.
• Bachelor’s degree in Computer Science, Software Engineering, or equivalent hands-on experience.

Responsibilities

• Design, develop, and maintain robust Windows Services using C#/.NET, focusing on security, performance, and reliability.
• Work with low-level Windows components, including Windows APIs, file system hooks, and network stack integration.
• Implement advanced cybersecurity features, such as privilege control, intrusion prevention, and data protection mechanisms.
• Diagnose and resolve complex issues involving system performance, concurrency, memory management, and network communication.
• Collaborate across teams to ensure services align with enterprise security and compliance standards.
• Participate in code reviews, share best practices, and contribute to a clean, maintainable codebase.
• Continuously improve service resilience, monitoring, and observability with a proactive mindset.

Skills

C#/.NET

Async programming

Multithreading

Windows internals

Networking: TCP/IP/HTTP/DNS

WinDbg / Process Monitor

SQL Server

RESTful APIs

Secure coding practices

Education

Bachelor’s degree in Computer Science or Software Engineering

Tools

WinDbg

Process Monitor

Job description

ThreatLocker is seeking a Windows Service Developer to design, implement, and optimize high-performance background services in C#/.NET, with a focus on Windows OS internals. This in-office role is based in Orlando, FL, and requires depth in Windows architecture and secure coding practices.

You will work on the core endpoint protection platform, collaborating with system internals, file systems, and network layers to build scalable, secure service components.