Job#: 3019443
Job Description:
Senior Software Engineer - Test Systems & Hardware Integration
Clearance Required: Active Secret (Interim acceptable to start) Work Schedule: 9/80 Location: Onsite Education: STEM bachelor's degree required
Overview
We are seeking a Senior Software Engineer to design, develop, integrate, and support software applications used in test systems and hardware-in-the-loop environments. This role involves object-oriented software development, hardware interface integration, troubleshooting complex test instrumentation, and leading junior engineers within a multidisciplinary engineering team.
Required Qualifications
Bachelor's degree in a STEM field and 5+ years of industry experience OR 3+ years with an advanced degree
Experience designing, developing, and integrating object-oriented software using:
C# C++ (Additional languages accepted)
Proficiency with Microsoft Visual Studio within a Windows operating system
Ability to manage multiple concurrent software engineering tasks
Experience troubleshooting software and test equipment instrumentation
Experience working within multidisciplinary engineering teams
Ability to develop and derive software requirements
Ability to lead and mentor junior engineers
Active Secret security clearance required prior to start
Preferred Qualifications
Experience developing and optimizing computer architectures and hardware performance
Experience developing software drivers for hardware interfaces
Hands-on experience with common hardware protocols:
TCP/IP UDPRS-422
Experience using UML (Unified Modeling Language) for system architecture and design
Familiarity with software development lifecycles, including:
Waterfall Agile
Experience practicing software configuration management, using:
Azure DevOps Server GitHub
Strong communication and interpersonal skills
Experience providing technical leadership or project-level oversight
Additional Position Information
Work Schedule: 9/80 Exempt Status: Determined by supplier based on FLSA Service Contract Act: Not applicable International Travel: Not required unless program-specific Clearance: Secret required prior to start
Submission Instructions for Vendors
Submittal notes must include:
Active clearance status Current location (city/state) Desired work location Include any prior experience supporting major defense contractors (dates, programs, managers)
All resumes must be submitted in PDF format with no candidate or supplier contact information
EEO Employer
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. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or 844-463-6178.
Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details.
Apex Benefits Overview
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 a HSA (Health Savings Account on the HDHP plan), a SupportLinc 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. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.
Employee Type: Contract Location: Tucson, AZ, US Job Type: Date Posted: February 25, 2026 Pay Range: $30 - $75 per hour
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