Senior Software Engineer

We are hiring Senior Software Engineer – Test Systems (ATE / C# / Hardware Integration) to build software for automated test systems (ATE) used in aerospace and defense. Hands-on role working across C#, C++, hardware integration, and real-world production systems. We hire and grow engineers who thrive on solving hard problems and turning bold ideas into real-world solutions. If you’re driven to design, develop, and test technology that truly makes an impact, you’ll feel at home here.

Join Quest Defense Systems & Solutions as our Senior Software Engineer to develop software for automated test equipment (ATE) and factory test systems supporting advanced aerospace and defense products.  This is a hands-on engineering role focused on building applications, integrating hardware, and troubleshooting real-world test environments. You’ll work directly with instrumentation, production systems, and hardware interfaces, making a tangible impact on product quality and delivery.

Location: Tucson or Scottsdale, AZ (onsite)
Relocation: Available
Clearance: U.S. Citizenship required (Secret Clearance preferred)

Key Responsibilities

• Develop test software applications, libraries, and instrument drivers (C#, C++)

• Integrate software with automated test equipment (ATE) and lab instrumentation

• Troubleshoot software and hardware integration issues in production environments

• Collaborate with electrical, systems, and manufacturing engineers

• Support full software lifecycle (requirements → development → validation)

• Work in a fast-paced environment supporting real production systems

Engineers from aerospace, defense, manufacturing, or industrial automation backgrounds are encouraged to apply.

Required Qualifications

• 5+ years of experience in software development (C#, C++, or similar)

• Experience with test systems, hardware integration, or instrumentation

• Strong troubleshooting skills across software and physical systems

• Experience with Windows OS, Visual Studio, Azure DevOps

• Bachelor’s degree in STEM (or equivalent experience)

• U.S. Citizenship (clearance eligible)

Preferred Qualifications

• Experience with Automated Test Equipment (ATE)

• Familiarity with NI tools (VISA, MAX, etc.) or LabVIEW

• Knowledge of hardware interfaces (TCP/IP, UDP, RS-422)

• Background in aerospace, defense, or manufacturing

The QDSS Advantage:

At QDSS, our advantage is purpose-driven work, collaborative teams, and complex challenges that push boundaries and build lasting impact. You’ll grow your career while contributing to mission-critical programs that demand excellence and shape the future.

What You’ll Find Here

• Work That Matters – Next-generation, safety- and mission-critical projects where your contributions have real-world impact.

• Growth That’s Supported – Competitive compensation, employer-matched 401(k), certification assistance, and clear opportunities for advancement.

• A Culture That Works – A flexible, collaborative, and people-first environment where teamwork, innovation, and balance are valued.

Benefits Include

• Competitive pay, comprehensive medical/dental/life and disability coverage, 401(k) with employer match, professional development support, and a flexible, friendly workplace.

Full compensation package is based on candidate experience and certifications

Pay Ranges

$69—$74 USD

At Quest Defense Systems and Solutions, we don’t just build technology — we engineer the future. From next-generation aerospace solutions to cutting-edge defense systems, we tackle the toughest, mission-critical challenges that keep people safe and push the boundaries of innovation. This is where problem-solvers, innovators, and visionary thinkers come together to shape the future. With over 25 years of aerospace and defense engineering expertise, our commitment to delivering high-quality, transformative solutions sets us apart — not just as an industry leader, but as a driving force for impactful change. Together, we’re not just leading the industry — we’re revolutionizing it.

Quest Defense provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.