Staff Backend Engineer (Rails)

Tread

$120K — $150K *
US-AnywhereRemote in San Francisco, CA
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • Strong Rails experience or comparable backend framework experience with quick adaptability.
  • Ability to conceptualize systems, including interfaces and scalability.
  • Experience in modeling workflows despite unreliable data sources.
  • Proven high ownership in projects and responsibilities.
  • Experience with AI coding tools in daily operations.

Responsibilities

  • Manage complex state machines for logistics projects.
  • Operate a telematics system tracking extensive data across thousands of vehicles.
  • Design and implement geofencing and event processing based on GPS data.
  • Develop algorithms for dispatch optimization and automated load assignments.
  • Oversee payments infrastructure that processes large volumes monthly.
  • Deploy customer-facing features utilizing multi-channel processing (MCP) and large language model (LLM) capabilities.
  • Integrate with various external systems including telematics and ERPs.
  • Contribute to the development of internal AI tools for code quality and review processes.

Benefits

  • Continuous deployment and rapid PR review processes.
  • Focus on correctness to minimize on-call responsibilities.
  • Collaborative environment with shared internal skills library for AI tooling.
  • Investment in developer environment improvements and CI workflows.
  • Opportunity to work on meaningful, complex backend challenges.
Full Job Description
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 and geo-driven event processing that turns raw GPS into structured dispatch events.
  • Build algorithmic dispatch and optimization, including automated load assignment.
  • Run the payments stack that settles ~$1B/month in hauler payouts.
  • Ship customer-facing agentic workflows on our MCP and LLM features.
  • Build integrations with telematics providers, scale houses, ERPs, and other external systems.
  • Shape our internal AI tooling - shared agent skills, automated review, prompt and skill infrastructure.


Requirements
  • Strong Rails experience, or strong experience in a comparable backend framework and willingness to ramp fast.
  • You think in systems - interfaces, schemas, invariants, failure modes - and you've shipped designs that held up as the product scaled past their original assumptions.
  • You can model workflows where the source of truth is unreliable and the system still has to settle correctly.
  • High ownership.
  • Daily, opinionated use of AI coding tools.


Preferred
  • You can debug production issues and explain root causes.
  • Background in logistics, ops, payments, or fintech.


How We Work

We deploy continuously, review PRs the same day, and invest in correctness up front so on-call stays light.

AI tooling is part of the infrastructure. We maintain a shared internal skills library across Claude Code and Cursor, with namespaced agent skills the whole team uses for reviewing diffs and resolving PR feedback. We engineer the agent loop itself - skills, prompts, review pipelines. We invest in the dev environment and CI work that makes coding agents useful: devcontainers, fast feedback, pre-approved permissions, cloud agent support. Improving the SDLC is first-class engineering work.

Before You Apply

This isn't the right role if you want to:
  • Write only CRUD endpoints.
  • Work from fully-specified requirements.
  • Treat AI coding tools as a side experiment.


How to Apply

Send something you've worked on where the backend had real complexity. A repo, a write-up, an architecture doc, a postmortem. One good thing beats a long resume.

Similar Jobs

More Jobs at Tread

More Information Technology Jobs

Find similar Staff Backend Engineer (Rails) jobs: