Windows Service Developer

Threat Locker® is a leader in endpoint protection technologies, providing enterprise-level cybersecurity tools to improve the security of servers and endpoints. The Threat Locker® platform with Application Allow listing, Ring fencing™, Storage Control, Elevation Control, Endpoint Network Control, Configuration Management, and Operational Alert solutions are leading the cybersecurity market toward a more secure approach of blocking the exploits of application vulnerabilities.

Threat Locker is seeking a highly skilled and self‑driven Windows Service Developer to join our cybersecurity engineering team. In this role, you will design, implement, and optimize high‑performance background services in C#/.NET, with a strong focus on Windows OS internals. These services are critical components of Threat Locker’s endpoint protection platform — defending systems from the inside out.

The ideal candidate is an expert developer with a deep understanding of Windows architecture, secure coding practices, and performance optimization. You will work closely with system internals, file systems, and network layers to build resilient, scalable, and secure service components.

• 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.

• 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., Win Dbg, 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.

• Experience with C/C++ interop, kernel development, or Windows filter drivers.
• Proven ability to design highly concurrent, long‑running Windows Services with efficient resource management.
• Familiarity with endpoint protection, EDR, or network monitoring technologies.
• Understanding of containerized environments and Dev Ops pipelines for service deployment.
• Hands‑on experience with Git Hub Actions, CI/CD pipelines, and multi‑target build orchestration (.NET Framework and .NET Core).
• Deep understanding of Windows security architecture, access control, and threat mitigation strategies.
• Microsoft or cybersecurity certifications are a strong plus.

• Job will generally be performed in an office environment but may require travel to visit company offices and/or property locations.
• While performing duties of this job, you may occasionally be required to stand, walk, sit, reach with hands and arms, climb or balance, stoop or kneel, talk and hear, and use fingers and hands to feel objects and tools.
• Must occasionally lift and/or move up to 25 pounds.
• Specific vision abilities required include close vision, distance vision, depth perception, and the ability to adjust focus.

Threat Locker is committed to equal employment opportunity and does not discriminate on the basis of any protected group status under applicable law. This position is open to all qualified candidates regardless of race, color, religion, national origin, sex, gender identity, gender expression, sexual orientation, disability, veteran status, or any other characteristic protected by law.