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Staff Principal Software Engineer Windows

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Staff Principal Software Engineer Windows in Remote

  • CloudZero
  • Full time
  • Email
  • Worldwide

Responsibilities

  • Take the Windows agent from proof of concept to a signed, installable, auto-updating product.
  • Own the WFP callout driver and Go user-mode relay while keeping both components synchronized as they evolve.
  • Handle production kernel-mode driver signing, EV certificates, Microsoft attestation, Secure Boot, and code integrity.
  • Build the installer, update mechanism, clean uninstall path, and enterprise deployment story.
  • Design fail-open behavior so non-AI traffic bypasses the agent and failures do not disrupt endpoint connectivity.
  • Manage local CA trust and TLS interception in a safe, transparent, and reversible way.
  • Build the endpoint client in Electron and TypeScript and define Windows-agent product parity with macOS.
  • Raise engineering standards through code review, design feedback, and direct mentorship.

Requirements

  • Deep experience shipping Windows services, drivers, or endpoint agents to customer-controlled machines.
  • Experience with kernel-mode or low-level Windows development using KMDF or WDM, the Windows Driver Kit, and WinDbg.
  • Working knowledge of Windows networking internals and the Windows Filtering Platform or a comparable traffic-interception approach.
  • Proficiency in C or C++ for driver development and Go or another systems language for user-mode development.
  • Ability to work across a kernel driver, user-mode service, and desktop UI, or clearly communicate areas of strength and support needed.
  • Hands-on experience with Windows code signing, Authenticode, EV certificates, Microsoft attestation, or the WHQL process.
  • Track record of shipping endpoint software with attention to failure handling, cleanup, least privilege, and production reliability.
  • Ability to evaluate kernel-level tradeoffs and explain them to engineering, product, and leadership stakeholders.
  • Track record of shipping production software, not just designing it.
  • Preferred experience building enterprise-scale endpoint security, EDR, DLP, or network-monitoring agents.
  • Preferred experience with TLS interception, MITM proxies, certificate trust management, MSIX, MSI, WiX, auto-update frameworks, Intune, MDM, Group Policy, or Windows/macOS endpoint software.
  • Experience using AI coding tools and articulating their workflow and limitations is a bonus.

Benefits

  • Collaborative, fast-moving environment with direct impact on the product.
  • Opportunity to work with cutting-edge technology on complex cloud and AI-cost challenges.
  • Opportunity to grow with a rapidly scaling company.

Salary: $220k - $290k/yr

CloudZero

CloudZero is the financial control plane for AI economics. We turn AI spend into the unit economics leaders need to make defensible investment decisions: cost per customer, per feature, per outcome.

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