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Callbook AI

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.
Active Founders
Diego Avellaneda
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
Daniel Martinez
Daniel Martinez
Founder & Product
CTO at Callbook AI. CPO at Treble (YC S19). Leading B2B products for 5+ years.
Company Launches
Callbook AI: The AI collections agency for late stage portfolios
See original launch post

We are a collections agency entirely run by AI.

We have found out that the most effective way to collect a portfolio is by first doing a deep research to locate and understand each person´s situation, and then negotiate with them.

As a result, we've consistently outperformed every competing collection solutions.

https://www.youtube.com/watch?v=rwVW4nApj1E

Today, we’re negotiating with 100K+ people every week. We’ve delivered historic recovery at every company we’ve worked with and won 100% of our head-to-head pilots against competing solutions.

Founders Diego and Daniel bring experience across machine learning and B2B products. Diego has published two peer-reviewed papers on on-device deep learning and TinyML with Elsevier, has 6+ years of experience in embedded ML, and previously built Audi’s e-commerce platform at CI&T. Daniel, former CPO and founder at Treble (YC S19), has 5+ years of experience building and leading B2B products.

Our ask

If you know a lender (bank, fintech, BNPL, retailer, insurer). We’d love an intro. sales@callbook.ai

Callbook AI
Founded:2025
Batch:Summer 2026
Team Size:7
Status:
Active
Location:San Francisco
Primary Partner:Jon Xu