Senior Fullstack Engineer

PrePass • Phoenix, AZ

154d

About The Position

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.

Requirements

• 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.

Nice To Haves

• 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.

Responsibilities

• 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).
• 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.
• 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.
• 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.

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Bachelor's degree
• Number of Employees: 51-100 employees