# Stephen Blum

> Stephen Blum is founder and CTO. PubNub on Anchor Terminal, with grades, an about and public profiles.

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- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

Founder and CTO.

Stephen Blum co-founded PubNub and is its CTO. He designed its first architecture and built the core engine of its real-time network. He earlier founded LTSun and joined Microsoft after it was acquired, and was chief architect of TrustedOpinion.com, a social recommendations site in 50 languages.

- LinkedIn: https://www.linkedin.com/in/stephenlb/

## What Stephen builds

- [PubNub](https://www.anchorterminal.com/tools/pubnub.md), graded B, 68.3/100, in Event delivery & webhooks. Hosted realtime messaging from PubNub Inc. in San Francisco. Clients publish and subscribe on channels through SDKs or a REST API, with presence, message history, Functions and event forwarding to webhooks. An Admin API and an MCP server manage accounts. Founder and CTO, researched 2026-10-27.

## Works with

- [Todd Greene](https://www.anchorterminal.com/people/todd-greene/), Founder and CEO

## Backed by

- [The Raine Group](https://www.anchorterminal.com/investors/the-raine-group/)
- [Sapphire Ventures](https://www.anchorterminal.com/investors/sapphire-ventures/)
- [Scale Venture Partners](https://www.anchorterminal.com/investors/scale-venture-partners/)
- [Relay Ventures](https://www.anchorterminal.com/investors/relay-ventures/)
- [Cisco Investments](https://www.anchorterminal.com/investors/cisco-investments/)
- [Bosch Ventures](https://www.anchorterminal.com/investors/bosch-ventures/)
- [Ericsson](https://www.anchorterminal.com/investors/ericsson/)
- [Hewlett Packard Enterprise](https://www.anchorterminal.com/investors/hewlett-packard-enterprise/)

## Questions

### Who is Stephen Blum?

Stephen Blum co-founded PubNub and is its CTO. He designed its first architecture and built the core engine of its real-time network. He earlier founded LTSun and joined Microsoft after it was acquired, and was chief architect of TrustedOpinion.com, a social recommendations site in 50 languages.

### What does PubNub Inc. make?

Anchor Terminal lists PubNub from PubNub Inc.. Hosted realtime messaging from PubNub Inc. in San Francisco. Clients publish and subscribe on channels through SDKs or a REST API, with presence, message history, Functions and event forwarding to webhooks. An Admin API and an MCP server manage accounts.

### Who has invested in PubNub Inc.?

The sources our research read name The Raine Group, Sapphire Ventures, Scale Venture Partners, Relay Ventures, Cisco Investments, Bosch Ventures, Ericsson and Hewlett Packard Enterprise.

### How are Stephen's tools graded?

PubNub is graded B, 68.3 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://www.pubnub.com/company/leadership/
- https://www.linkedin.com/in/toddngreene/
- https://www.linkedin.com/in/stephenlb/
- https://www.pubnub.com/
- https://www.pubnub.com/company/contact-us/
- https://support.pubnub.com/hc/en-us
- https://www.pubnub.com/pricing/#support-plans
- https://www.pubnub.com/company/contact-us

These are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.

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