Senior Windows Internals Engineer - Security & Performance

Allstarsit; San Francisco (CA); Remote; USD 180,000 - 230,000; Full time

Job summary

ALLSTARSIT is seeking a Senior C++ Software Engineer (Windows Internals) to design, develop, and maintain high-performance system-level software. You will work with Windows internals, kernel-mode and user-mode components, and contribute to secure, scalable engineering solutions.

The role emphasizes tackling complex problems, debugging at scale, and collaborating with an international team to advance cybersecurity technology in critical IT infrastructure.

Qualifications

• 6+ years of professional C++ software development experience.
• Hands-on experience with Windows API and multithreaded programming.
• Experience with AI-assisted development tools (e.g., Claude Code or similar) and LLM APIs.
• Strong analytical, debugging, and problem-solving skills.

Responsibilities

• Design, develop, and maintain high-performance security-related software modules using C/C++.
• Work extensively with Windows internals, including kernel-mode and user-mode development.
• Contribute to the architecture and implementation of advanced system-level software solutions.
• Investigate, troubleshoot, and resolve complex technical issues, security vulnerabilities, and performance bottlenecks.
• Collaborate closely with cross-functional engineering, product, and research teams.
• Analyze emerging security challenges and contribute to the continuous improvement of software reliability and protection capabilities.
• Participate in code reviews, technical discussions, and knowledge-sharing activities.
• Mentor team members and promote high standards of software engineering and code quality.

Skills

C++

Windows API

Multithreaded programming

AI-assisted development tools

LLM APIs

Analytical skills

Debugging

Problem solving

Team collaboration

Cybersecurity interest

Tools

Claude Code

Job description

ALLSTARSIT is seeking a Senior C++ Software Engineer (Windows Internals) to design, develop, and maintain high-performance system-level software. You will work with Windows internals, kernel-mode and user-mode components, and contribute to secure, scalable engineering solutions.

The role emphasizes tackling complex problems, debugging at scale, and collaborating with an international team to advance cybersecurity technology in critical IT infrastructure.