---
name: "Sean Er"
type: Person
description: "Sean Er is the chief technology officer and co-founder of Lightsage, a San Francisco startup whose platform tests how AI coding agents use software products through their APIs, SDKs, CLIs and MCP servers. He previously worked at ByteDance."
jobTitle: "CTO and Co-Founder"
worksFor: "Lightsage"
image: https://cdn.nanimediahouse.com/lightsage-founders.webp
canonical: https://www.sovereignmagazine.com/people/sean-er
publication: Sovereign Magazine
---

# Sean Er

Sean Er is the chief technology officer and co-founder of Lightsage, a San Francisco startup whose platform tests how AI coding agents use software products through their APIs, SDKs, CLIs and MCP servers. He previously worked at ByteDance.

**CTO and Co-Founder** at Lightsage

## Coverage

- [undefined](/article/lightsage-4m-seed-agent-led-growth-nexus) - Artificial Intelligence, 2026-09-08