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Senior Fullstack Engineer

Senior Fullstack Engineer

PrePassPhoenix, AZ, US
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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 Fullstack Engineer to architect and build systems that power real-time weigh station bypassing, tolling solutions, and safety alerts. In this role, you’ll work across the stack—from scalable .NET Core APIs to modern web frontends using React, TypeScript, and TailwindCSS. You’ll collaborate closely with product, design, and engineering teams, and mentor others while shaping technical strategy.

Essential Responsibilities

Backend Engineering & API Development

  • Lead the design and development of scalable, reliable backend services using .NET Core and C#.
  • Build APIs following RESTful principles, including pagination, versioning, authentication, and performance optimization.
  • Ensure backend code quality through testing frameworks like xUnit or NUnit.
  • Deploy and manage services on cloud platforms (Azure / AWS) using containers (Docker / Kubernetes).

Frontend Development

  • Architect and implement responsive, maintainable frontends with React, TypeScript, TailwindCSS, and MobX.
  • Ensure UI consistency and performance across browsers and devices.
  • Collaborate with design teams to deliver intuitive user experiences.

    • Architecture & Technical Strategy

  • Contribute to long-term technical strategy and architectural decisions.
  • Design systems end-to-end, balancing trade-offs and scalability.
  • Drive improvements in system performance, resilience, and observability.

    • Team Leadership & Mentorship

  • Mentor junior and mid-level engineers, fostering technical growth across the team.
  • Lead code reviews and promote engineering best practices.
  • Collaborate cross-functionally to shape technical solutions.

    • Requirements

    Required

  • 7+ years of professional software engineering experience, including significant fullstack development.
  • Expert-level skills with .NET Core and C#, including API development and optimization.
  • Hands-on experience with React, TypeScript, TailwindCSS, and MobX (or similar state management).
  • Deep understanding of relational databases (SQL Server, PostgreSQL, etc.) and data modeling.
  • Strong testing discipline across backend systems.
  • Experience deploying to cloud platforms and working with containers.
  • Familiarity with observability tools (metrics, logging, tracing).
  • Proven track record of mentoring engineers and raising engineering standards.

    • Bonus Points For

  • Experience with domain-driven design (DDD), clean architecture, or microservices.
  • Knowledge of GraphQL or advanced REST patterns.
  • Experience with nonrelational databases (Cosmos DB, MongoDB, DynamoDB).
  • Hands-on experience with serverless functions, API gateways, CI / CD pipelines, and event-driven messaging (e.g., Service Bus, Event Hubs).
  • Experience building distributed systems using NServiceBus or MassTransit.

    • Desired Characteristics

  • Strategic thinker with a proactive, problem-solving mindset.
  • Comfortable navigating ambiguity and change.
  • High degree of initiative, ownership, and accountability.
  • Strong communication skills and ability to collaborate across teams.
  • Passion for building impactful technology that improves real-world outcomes.

    • Benefits

    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.
  • 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.
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