# Thomas Steinacher

> Thomas Steinacher is co-founder and Principal Engineer of R&D. Close API + MCP 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

Co-founder and Principal Engineer, R&D.

Thomas Steinacher is co-founder and principal engineer at Close, where he leads R&D. He was the technical co-founder who turned the internal sales tool built at ElasticSales into Close, writing much of the original product, and has contributed to open-source projects such as Flask-MongoRest and quotequail.

## What Thomas builds

- [Close API + MCP](https://www.anchorterminal.com/tools/close.md), graded B, 66.8/100, in CRM & customer platforms. REST API and hosted MCP server for Close, a sales CRM built around calling, email and SMS. Co-founder and Principal Engineer, R&D, researched 2026-10-27.

## Works with

- [Anthony Nemitz](https://www.anchorterminal.com/people/anthony-nemitz/), Co-founder; Member of Technical Staff per LinkedIn
- [Phil Freo](https://www.anchorterminal.com/people/phil-freo/), VP Product & Engineering
- [Steli Efti](https://www.anchorterminal.com/people/steli-efti/), Co-founder and CEO

## Backed by

- [Michael Birch](https://www.anchorterminal.com/investors/michael-birch/)
- [SV Angel](https://www.anchorterminal.com/investors/sv-angel/)
- [Spark Capital](https://www.anchorterminal.com/investors/spark-capital/)
- [David Tisch](https://www.anchorterminal.com/investors/david-tisch/)

## Questions

### Who is Thomas Steinacher?

Thomas Steinacher is co-founder and principal engineer at Close, where he leads R&D. He was the technical co-founder who turned the internal sales tool built at ElasticSales into Close, writing much of the original product, and has contributed to open-source projects such as Flask-MongoRest and quotequail.

### What does Close make?

Anchor Terminal lists Close API + MCP from Close. REST API and hosted MCP server for Close, a sales CRM built around calling, email and SMS.

### Who has invested in Close?

The sources our research read name Michael Birch, SV Angel, Spark Capital and David Tisch.

### How are Thomas's tools graded?

Close API + MCP is graded B, 66.8 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.

## Sources

- https://www.close.com/about
- https://www.linkedin.com/in/steliefti/details/experience/
- https://www.linkedin.com/in/steliefti/
- https://x.com/Steli
- https://www.linkedin.com/in/anthonynemitz/details/experience/
- https://www.linkedin.com/in/anthonynemitz/
- https://close.com/author/thomas-steinacher
- https://www.linkedin.com/in/philfreo/details/experience/
- https://www.linkedin.com/in/philfreo/
- https://www.ycombinator.com/companies/close
- https://help.close.com/welcome-to-close-help
- https://close.com/
- https://help.close.com/

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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