Senior Software Engineer

About PrePass PrePass® is North America's most trusted weigh station bypass and toll management platform. We’re transforming how the transportation industry operates—creating solutions that keep trucks moving safely, efficiently, and compliantly. This means making bold decisions and building systems that support not only fleets but the broader economy. It all starts with enabling commercial vehicles to keep rolling with seamless toll management, weigh station bypass, and safety solutions. It’s what we do best, and we do it to meet the demands of the road every day. That’s why people join us: our solutions are implemented in real-time, on highways and interstates across the nation, helping fleets go farther, faster. This work challenges and rewards, presenting complex problems that need ambitious answers. We hire bold thinkers with a heart for impact, a passion for progress, and the optimism to shape the future of transportation. About the Role We’re looking for a Senior Software Engineer to design and build working prototypes, proofs of concept (PoCs), and pilot-ready solutions that validate technical feasibility and accelerate decision-making. In this role, you will work across software development, cloud platforms, and hardware integration—collaborating closely with engineers in a hands-on lab environment and supporting field testing initiatives. You will help evaluate emerging technologies and generate empirical evidence and documentation that can guide future production systems. This hybrid position is based in our Phoenix, AZ office, with in-office collaboration required at least three days per week to support lab work and hands-on testing. Essential Responsibilities Prototype Development & Technical Innovation Design, develop, and maintain complex software solutions using C#, modern .NET, and SQL Server, balancing rapid prototyping with maintainability and engineering quality. Develop cloud-native prototypes and services on Microsoft Azure (e.g., App Services, Azure Functions, Azure SQL, messaging and integration patterns, Storage). Build and evolve APIs and integration components that connect software systems with hardware devices, external services, and data sources. Explore and prototype containerized architectures (Docker, Kubernetes, and Azure container services) to evaluate portability, scalability, and deployment patterns. Design and implement applied AI capabilities within prototypes and PoCs, such as data analysis, inference, automation, or decision-support functionality. Research, Prototyping & Evaluation Lead rapid development of PoCs and working prototypes, defining hypotheses, success metrics, and evaluation criteria. Collect data and observations to recommend whether initiatives should advance, pivot, or stop based on demonstrated technical feasibility. Ensure prototypes account for real-world constraints including deployment, scalability, maintainability, operational impact, and eventual production viability. Document architecture, design trade-offs, and technical findings to create blueprints for potential production systems. Investigate emerging technologies such as augmented reality (AR), spatial computing, and advanced visualization frameworks to support diagnostics, field testing, and next-generation user experiences. Hardware Integration & Field Testing Partner closely with hardware-focused engineers to integrate components and develop working prototypes for new initiatives. Plan and execute hands-on lab and field testing of integrated hardware/software solutions to validate performance, reliability, and environmental resilience. Develop test harnesses, diagnostics, telemetry, and logging to support debugging and repeatable evaluation. Support field testing activities including deployment preparation, test procedures, and post-test analysis of results. Troubleshoot complex issues across hardware, firmware, networking, and software systems, performing root-cause analysis and implementing durable solutions. Engineering Leadership & Collaboration Provide technical leadership through design reviews, code reviews, and architecture discussions. Advocate for engineering best practices, even within rapid prototyping and iterative development environments. Mentor junior and mid-level engineers through pair programming, coaching, and design guidance. Participate in Agile/Scrum ceremonies, helping ensure work remains time-bounded, outcome-driven, and clearly documented. Leverage AI-assisted development workflows (e.g., code generation, testing assistance, design review, and documentation support) to accelerate prototyping and improve developer productivity. Qualifications / Requirements Bachelor’s degree in Computer Science, Software Engineering, or a related field. 10+ years of professional software development experience delivering production and/or pilot-ready systems. Expert-level proficiency with C# and modern .NET (including .NET Core / current .NET versions). Strong experience designing and building solutions on Microsoft Azure, including cloud-native architectures and integrations. Extensive experience with SQL Server, including relational modeling, indexing, query optimization, and performance troubleshooting. Demonstrated ability to build prototypes and proofs of concept, define success criteria, and communicate findings clearly. Hands-on experience integrating software with hardware devices or external systems, including work in lab or field environments. Experience with automated testing, CI/CD pipelines, and DevOps tooling (Azure DevOps and Git preferred). Strong debugging, problem-solving, and analytical skills across distributed systems and integrated environments. Excellent communication and collaboration skills with the ability to mentor and guide engineers. Bonus Points For Experience designing service-oriented or event-driven systems and cloud-native microservices. Familiarity with distributed system concerns such as observability, resilience, and performance measurement. Experience developing structured test plans and executing lab or field evaluations (including KPI definition and reporting). Familiarity with hardware integration protocols (e.g., serial, USB, networking, device telemetry) and edge/IoT-adjacent systems. Experience in transportation, logistics, or regulated industries. What Success Looks Like Delivers PoCs and prototypes that clearly validate or invalidate technical feasibility, informing product and investment decisions. Produces clear architecture documentation and technical insights that allow prototypes to transition toward production systems. Builds repeatable testing frameworks and tooling that improve the speed and reliability of lab and field evaluations. Elevates team capability by mentoring engineers and reinforcing strong engineering practices within a rapid-iteration R&D environment. How We Will Take Care of You Robust benefit package that includes medical, dental, and vision that start on date of hire. Paid Time Off, to include vacation, sick, holidays, and floating holidays. Paid parental leave. 401(k) plan with employer match. Company-funded “lifestyle account” upon date of hire for you to apply toward your physical and mental well-being (i.e., ski passes, retreats, gym memberships). Tuition Reimbursement Program. Voluntary benefits, to include, but not limited to Legal and Pet Discounts. Employee Assistance Program (available at no cost to you). Company-sponsored and funded “Culture Team” that focuses on the Physical, Mental, and Professional well-being of employees. Community Give-Back initiatives. Culture that focuses on employee development initiatives. Company-wide bonus and commission plans. Join Us At PrePass, our mission drives us. We invest in relationships. We challenge ourselves to innovate and improve. We win together. Simply put, we live our Core Values. Ready to help move the transportation industry forward? Join us and let’s drive progress—together. #J-18808-Ljbffr