Windows Service Engineer - Cybersecurity & .NET

Threatlocker Inc; Orlando (FL); On-site; USD 110,000 - 150,000; Full time

Job summary

ThreatLocker is seeking a highly skilled Windows Service Developer to design, implement, and optimize high-performance background services in C#/.NET. The role focuses on Windows OS internals and is based in Orlando, FL, in-office.

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

Qualifications

• Expert-level proficiency in C#/.NET Framework and .NET Core, including asynchronous 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 experience with network control or firewall-level filtering.
• Hands-on experience with debugging and profiling tools (e.g., 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, with a 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

Asynchronous programming

Multithreading

Windows architecture

Secure coding practices

Performance optimization

Networking fundamentals

Education

Bachelor’s degree in Computer Science or Software Engineering

Tools

WinDbg

Process Monitor

SQL Server

GitHub Actions

Job description

ThreatLocker is seeking a highly skilled Windows Service Developer to design, implement, and optimize high-performance background services in C#/.NET. The role focuses on Windows OS internals and is based in Orlando, FL, in-office.

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