# Callbook AI

[Callbook AI on Hacklab](https://hacklab.so/org/callbook-ai)

Startup · 2 people on Hacklab

## Links

- [Website](https://callbook.ai/)
- [Y Combinator](https://www.ycombinator.com/companies/callbook-ai)
- [LinkedIn](https://www.linkedin.com/company/callbook-ai)

## About

<!-- hacklab:yc-profile -->

## YC company profile

AI collections agency for late stage portfolios

Callbook AI is a collections agency operated by AI. We collect late stage portfolios by finding, contacting and negotiating with borrowers.

- **YC batch:** Summer 2026
- **Founded:** 2025
- **Team size:** 7
- **Location:** San Francisco
- **Country:** US
- **Status:** Active
- **Industry:** B2B
- **Stage:** Early
- **Tags:** AI
- **YC partner:** Jon Xu

## Founders

### Diego Avellaneda — Founder/CEO

CEO at Callbook AI. Applied ML researcher with two peer-reviewed publications on deep learning and embedded systems (TinyML on-device deep learning for indoor tracking; low-cost embedded sensing, Elsevier). Master's in IoT applying TinyML to real-time truck telemetry 6+ years in embedded ML. Former Senior Software Engineer at CI&T, where he built Audi's e-commerce car-purchasing platform. Second-time founder

[LinkedIn](https://www.linkedin.com/in/diegoavellaneda/) · [X](https://x.com/diego_torres173)

### Daniel Martinez — Founder & Product

CTO at Callbook AI. CPO at Treble (YC S19). Leading B2B products for 5+ years.

[LinkedIn](https://www.linkedin.com/in/daniel-martinez-b7a764164/) · [X](https://x.com/imwi90)

[Source: Y Combinator](https://www.ycombinator.com/companies/callbook-ai) · Retrieved 2026-11-02. Company information is self-reported on YC.

## Current staff

- [Daniel Martinez](https://hacklab.so/daniel-martinez) — Founder & Product (Present)
- [Diego Avellaneda](https://hacklab.so/diego-avellaneda) — Founder/CEO (Present)