Applications Dev & Test - Software Design Engineer

Applications Dev & Test - Software Design Engineer 3

Software Design Engineer

• Start Date:
  
  1/20/2026
• End Date: 6/30/2026
• Duration: ~5 months
• Chance for Extension:
  Yes
• Location:
  
  Onsite - Redmond, WA
• Openings: 1
• Pay Range: $54-$59/hr

• C/C++ Development: 3+ years writing systems-level code.
• Operating Systems & Performance Analysis: 2+ years experience.
• Windows OS Development: 1+ year hands‑on experience.

• Education:
  
  Bachelor's degree in Computer Science, Computer Engineering, or related field.
• Experience:
  
  5+ years in systems software development.
• Core Competencies:
  • 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.

• 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.

• Deep OS‑level engineering experience.
• Proven ability to modernize legacy systems and APIs.
• Strong debugging and performance analysis skills.

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law.

Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.

Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers an HSA (Health Savings Account on the HDHP plan), a Support Linc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts.

In terms of professional development, Apex hosts an on‑demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA.