Staff Backend Engineer (Rails)

About Tread Tread is an AI-native vertical SaaS platform transforming construction materials logistics—a massive, essential industry that moves the aggregate, asphalt, and concrete behind every road, bridge, and building. In March 2026, we crossed $1Bn in monthly delivered load value on the platform, and we’re at ~$XM ARR and growing fast. We are a lean Engineering organization with BE, FE, and Mobile all <10 people total. Every individual has a meaningful impact on the code base and the product we deliver to customers. Our AI-powered platform serves Haulers, Producers, and Contractors—optimizing truck routing, loaded-mile delivery, and project planning while delivering exceptional customer service through personalized AI agents. We’re a Series A company backed by Mucker Capital, and we’re building the team that will take us from $XM to $XXM+ ARR. The Role We're hiring backend engineers to own our systems end-to-end — the data models, workflows, and APIs behind dispatch, ticketing, settlements, and integrations. You'll work with frontend, mobile, product, and our Forward Deployed Engineers, and you'll have meaningful input on how the system should behave for scalability and performance. Our code has been ~100% AI-generated since March 2026. It's changed how the team works. We're building the software factory that turns customer, PM, and engineering input into safe deployable code. We expect the engineering team to be spinning up agents and managing the output rather than writing code by hand. While AI generates code here, engineers own the architecture, invariants, tests, review, security, and production behavior of everything we ship. Stack Rails API (Ruby), Postgres, REST. React on the web, Flutter on mobile. AWS. What You'll Do - Manage state machines across projects, orders, jobs, and loads. - Operate a telematics layer with billions of rows tracking thousands of trucks across North America — live position, route history, mileage attribution. - Design geofencing