Mid-level Backend Software Engineer Jobs in San Francisco, California

6 open Mid-level Backend Software Engineer jobs in San Francisco, California at 6 companies, including OpenAI, HeyGen and Brex. Updated daily from company career pages.

OpenAI

OpenAI is an AI research and deployment company that conducts research and implements machine learning.

HeyGen

Next-gen generative AI video platform with customizable AI avatars, right from your browser

Brex

Brex is the first fully unified global spend platform — with corporate cards, expense management, reimbursements, and bill pay.

Lightning AI

Lightning AI is the first operating system for AI. Build AI models and Lightning Apps (end to end ML systems).

Hive

Hive provides cloud-based AI solutions for understanding, searching, and generating content

Ansa

The closed loop platform built for your customers

Updated 2026-10-10.