Your space-enabled career begins here

Engineers are the reason we exist—they’re the core of who we are. Embark on a journey with EXB Solutions at the forefront of technological innovation as we seek talented Engineers to shape the future of cutting-edge projects and contribute to a culture of excellence and creativity. What we do matters.

Quest Defense Systems & Solutions is seeking a Senior Principal, Principal, or Senior Software Engineer to support advanced aerospace and defense test systems. In this role, you’ll develop software, automation tools, and hardware interfaces that help validate mission-critical products in both engineering and production environments.

You’ll work hands-on with C++, C#, Python, Visual Studio, and lab instrumentation while partnering with cross-functional teams to solve integration challenges, troubleshoot complex systems, and keep high-visibility programs moving.

This is an excellent opportunity for a senior engineer who enjoys building software that interacts with real hardware, thrives in fast-paced environments, and wants to make a direct impact on cutting-edge defense technology.

Due to the nature of this role, all candidates must be U.S. citizens with the ability to obtain and maintain a Secret Clearance.

This role is onsite in Tucson, AZ. Relocation assistance is provided.

Key Responsibilities:

• Guiding multidisciplined teams in the development of test equipment
• Prioritize and handle multiple tasks in a production environment
• Contributing to cost and schedule management planning
• Communicating with senior management on project status
• Troubleshooting software and test equipment
• Develop requirements for software products
• Written and interpersonal communication skills with Program Management

Required Qualifications:

• Typically requires a bachelor’s degree in science, Technology, Engineering, or Mathematics (STEM) and a minimum of 5 years prior relevant experience, or an Advanced degree in a related field and a minimum of 3 years’ experience.
• Minimum of 5 years developing and integrating software applications using programming languages, including but not limited to C++. C#, Java, Python, or Visual Basic
• Minimum of 5 years of professional engineering experience utilizing integrated development environments and debugging tools to troubleshoot software implementation and ensure the integrity of the software products.
• Experience with Windows Operating System, Microsoft Visual Studio, and Microsoft Azure DevOps Server.
• Familiarity with laboratory test instrumentation, electronics, and software (Ex. NI VISA, NI Measurement and Automation Explorer, NI Switch Executive)

Desired Qualifications:

• Working knowledge of computer architecture and computer hardware optimization techniques.
• Extensive knowledge of common computer hardware interfaces and data protocols such as TCP/IP, UDP, or RS-422
• Extensive knowledge of the development of software drivers for the operation of computer hardware interfaces.
• Professional experience with Unified Modeling Language (UML) to visualize software architecture and design (EX. IBM Rhapsody, Cameo System Modeler, and Cameo Enterprise Architecture)
• Professional experience in software development lifecycles, such as Agile
• Experience with Software Configuration Management principles

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.