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# Senior Backend Engineer, Shopping Agents job in San Francisco

- **Company:** SAGE AI LABS LLC
- **Location:** San Francisco, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Databases, Python (Programming Language), Large Language Models, Deep Learning, Backend
- **Published:** September 4, 2026
- **Apply:** https://jobs.diversity.com/career/2476325/senior-backend-engineer-shopping-agents-california-ca-san-francisco

## About the Role

* 5+ years building backend and infrastructure systems, with strong Python
 * You have owned production systems end to end: deploys, databases, observability, and the pager. You have been the person who got paged, and you fixed the class of problem rather than the incident
 * You like adversarial problems. Systems where something on the other side is actively working against you
 * You take correctness seriously because the stakes are real. These systems spend customers' money, so a silent failure is a wrong order, not a red build
 * You can move without a finished spec. We are small, and the roadmap changes when the market does

Nice to have

 * Built AI-first products or LLM-based agents in production, not just in a prototype
 * Working knowledge of classic ML and deep learning, enough to reason about retrieval and ranking rather than only calling an API
 * Background in e-commerce, payments, or fraud and risk infrastructure

## Description

We build agents that shop for you. They find products across the open web and complete the purchase end to end. Real carts, real payments, and real systems built to stop them., Very few engineers get to own a category-defining system while the category is still being defined. This is one of those seats, at the point where it still counts as early. A year from now this problem will have a standard answer and someone will have written it. We intend for that to be us.


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