Lead Software Engineer (.NET)

Roadrunner Transportation Services•Downers Grove, IL

14h•Hybrid

About The Position

Roadrunner is growing, and we're looking for a highly motivated Lead Software Engineer (.NET) to join our winning team. If you're results-driven and want a fast-growing company with strong growth and earnings potential, apply today! Much of our operation runs on software we build ourselves. We're modernizing our core platforms, moving off legacy systems and onto cloud-native, API-first services on Azure. We also have AI use cases running in production and are expanding them carefully. As Lead Software Engineer (.NET), you'll drive engineering practices and hands-on design within the applications team, working closely with our Director of Architecture. Your work directly affects how freight moves. This role may provide opportunities for future leadership growth based on business needs and individual performance. You'll start as a hands-on lead, and as you show leadership, you can take on broader responsibility for people, priorities, and technical direction.

Requirements

Bachelor's degree in a related field, or equivalent experience
8+ years building production software in C# and .NET, including modern .NET, ASP.NET Core, and Entity Framework Core
Strong SQL Server skills: data modeling, query tuning, performance
Modern front-end knowledge (JavaScript/TypeScript); backend depth matters most.
Hands-on Azure experience (App Service, Functions, Azure SQL, Storage, Application Insights, or similar)
Experience designing RESTful APIs and system integrations
A track record of improving or modernizing legacy .NET Framework systems
Experience setting engineering practices (Git-based workflows, CI/CD, testing, code review) and mentoring other developers
Comfort explaining technical tradeoffs to non-technical stakeholders

Nice To Haves

Transportation, logistics, LTL, or supply chain experience
Hands-on React or Angular experience
API gateway, microservices, or identity/authorization experience
Experience leading Scrum, Agile, or Kanban teams
Hands-on use of AI coding tools or building AI-enabled features

Responsibilities

Design and build scalable, secure services and web apps (C#, .NET 8+, ASP.NET Core, React, Azure)
Lead the modernization of legacy applications: refactoring, re-platforming, and replacing them step by step
Design APIs and integrations with internal systems, customers, and partners
Own production quality: CI/CD, automated testing, observability, and secure coding
Mentor engineers on the team through code reviews, design discussions, and day-to-day coaching
Work directly with operations and business leaders to turn real freight problems into software