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Apex Systems Logo Apex Systems · IT - Software Development

Software Design Engineer 3

United States, Redmond 60.00 - 65.00 USD / Hour · Job Posted January 11, 2026
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Job Description

The Software Design Engineer will design, develop, implement, test, and maintain business and computer applications software or specialized utility programs, including client/server applications, as well as major enhancements to existing systems.

Job Responsibility

  • Troubleshoot, triage, and resolve failures in test pipelines across multiple projects
  • Modify and enhance test automation for network protocols and network security
  • Perform periodic manual tests for VPN, IPSec connection security tunnels, and Linux subsystems
  • Fine-tune and improve complex software implementation projects
  • Gather and analyze system requirements, document specifications, and develop solutions
  • Customize system software to meet client requirements
  • Prepare detailed design and test documentation
  • Implement new or modify existing programs and author automated tests
  • Perform post-implementation validation and resolve bugs

Requirements

  • Bachelor’s degree in Computer Science, Computer Engineering, or related field
  • 5+ years of experience in software design and development
  • Strong foundation in data structures, algorithms, and software design principles
  • Experience with large-scale systems software development
  • Proficiency in troubleshooting and unit testing for both new and legacy systems
  • Sufficient proficiency in reading and writing code
  • Systems-level programming in C and C++
  • Operating systems knowledge (Windows and Linux)
  • Debugging tools: Windows Debugger, Wireshark, gdb, tcpdump
  • Experience with WPP/ETW trace analysis
  • Networking protocols: IPSec, TCP, QUIC
  • VPN and SDN technologies
  • PowerShell and YAML scripting

Nice to have

  • Ability to write clean, maintainable systems-level code in C/C++
  • Strong debugging skills for legacy software using instrumentation and tracing tools
  • Experience analyzing WPP/ETW traces for complex system issues
  • Skilled in developing and enhancing automated test suites
  • Familiarity with VPN, IPSec-based security, and SDN technologies

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
  • Certification discounts
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