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Principal Software Engineer

Microsoft

$163,000 - $331,200
Aug 19, 2025
Redmond, WA, USA
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Microsoft Security aims to make the world a safer place by protecting consumers and enterprises from cyber-attacks through innovative technologies and safeguarding digital platforms, devices, and clouds in heterogeneous environments.

Requirements

  • deep understanding of the Windows operating system
  • developing architectural solutions from the ground up, focusing on fundamentals such as performance, reliability, and extensibility
  • coding in languages including, but not limited to, C, C++, C, Java, JavaScript, or Python
  • 10+ years software development experience working in the Windows OS (and/or similar systems programming experience)
  • Proven track record architecting and developing robust and extensible solutions
  • Proficiency in C/C++ and Rust
  • Experience with multi-threaded / parallel programming

Responsibilities

  • champion the highest levels of code quality across the breadth of our Windows Client codebase
  • build the next generation of endpoint protection
  • championing fundamentals such as performance and reliability
  • ensuring secure coding patterns
  • advancing usage of memory and type safe languages
  • driving foundational changes throughout the entire Defender stack
  • Partner with multiple teams across Microsoft, architecting and implementing solutions deeply integrated into the Defender stack

Other

  • Ability to meet Microsoft, customer and/or government security screening requirements
  • Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.
  • Foster a healthy and inclusive team environment
  • Embody our culture and values