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Apex Systems Logo Apex Systems · IT - Software Development

Software Design Engineer

United States, Redmond 56.00 - 59.00 USD / Hour · Job Posted January 11, 2026
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Job Responsibility

  • Analyze and modernize complex legacy implementations
  • Write clean, maintainable systems-level code in C/C++
  • Debug and fix issues using advanced OS-level tools
  • Prepare detailed specifications, test plans, and migration packages
  • Conduct unit testing and post-implementation validation

Requirements

  • C/C++ Development: 3+ years writing systems-level code
  • Operating Systems & Performance Analysis: 2+ years experience
  • Windows OS Development: 1+ year hands-on experience
  • Bachelor’s degree in Computer Science, Computer Engineering, or related field
  • 5+ years in systems software development
  • Strong foundation in data structures, algorithms, and software design
  • Large-scale systems software design and troubleshooting
  • Debugging legacy code using Windows Debugger, instrumentation, WPP/ETW trace analysis
  • Ability to modernize legacy APIs and implement new designs
  • Sufficient proficiency in reading/writing code

What we offer

  • Medical, dental, vision, life, disability, and other insurance plans
  • ESPP (employee stock purchase program)
  • 401K program with company match after 12 months
  • HSA (Health Savings Account on the HDHP plan)
  • SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions
  • Corporate discount savings program
  • On-demand training program
  • Access to certification prep and a library of technical and leadership courses/books/seminars after 6+ months tenure
  • Certification discounts
  • Dedicated customer service team
  • Certified Career Coach
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