Windows Services Developer – Cybersecurity

ThreatLocker Inc.; Orlando, Northern (FL, KY); Hybrid; USD 90,000 - 135,000; Full time

Job summary

ThreatLocker Inc. is seeking a Software Developer - Windows Services in Orlando, FL. This in-office role focuses on designing and implementing high-performance background services in C#/.NET, with deep attention to Windows internals, security, and reliability.

You will work with Windows APIs, file systems, and network layers to deliver resilient service components for ThreatLocker’s endpoint protection platform.

Qualifications

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

Responsibilities

• Design, develop, and maintain robust Windows Services using C#/.NET, with focus 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 proficiency

Asynchronous programming

Multithreading

Windows internals

Network protocols (TCP/IP, HTTP/S, DNS

Debugging/profiling tools

RESTful APIs

Secure coding practices

Education

Bachelor's degree in Computer Science or Software Engineering

Tools

WinDbg

Process Monitor

GitHub Actions

Job description

ThreatLocker Inc. is seeking a Software Developer - Windows Services in Orlando, FL. This in-office role focuses on designing and implementing high-performance background services in C#/.NET, with deep attention to Windows internals, security, and reliability.

You will work with Windows APIs, file systems, and network layers to deliver resilient service components for ThreatLocker’s endpoint protection platform.