Callbook AI
YC S26San Francisco, US · Founded 2025 · 7 employees · 2 known investors
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364 people in our graph share verified history with the Callbook AI team — schools, employers, funds. One of them is your warm intro.
Garry Tanunlockedknows Diego Avellaneda · together at Y Combinator (overlapped)
×11knows the team · via Y Combinator
Callbook AI provides AI agents that contact and negotiate with borrowers across calls, SMS, and email to handle debt collections. It segments accounts by ability and willingness to pay and routes customers to the right next step, serving financial institutions.
AI & Machine LearningEnterprise SoftwareFintechSaaSAIUnited States of AmericaAmerica / CanadaFully Remote
Founders & leadership· Y Combinator alumni (S26)
Callbook AI was founded in 2025 by Diego Avellaneda and Daniel Martinez.
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Diego Avellanedain𝕏CEO & FounderDiego Avellaneda is the founder and CEO of Callbook AI, with over six years in embedded machine learning and two peer-reviewed publications on TinyML and embedded sensing. He holds a master's in IoT focused on applying TinyML to real-time truck telemetry and previously worked as a Senior Software Engineer at CI&T, where he helped build Audi's e-commerce car-purchasing platform.
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Daniel Martinezin𝕏Founder & ProductFounder and product lead at Callbook AI, previously CTO there and Chief Product Officer at Treble (YC S19). Has spent over five years leading B2B products.
Investors · 2
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Frequently asked questions
- What does Callbook AI do?
- Callbook AI provides AI agents that contact and negotiate with borrowers across calls, SMS, and email to handle debt collections. It segments accounts by ability and willingness to pay and routes customers to the right next step, serving financial institutions.
- Who founded Callbook AI?
- Callbook AI was founded by Diego Avellaneda, Daniel Martinez in 2025.
- Who are Callbook AI's investors?
- Callbook AI's investors include Vela Partners, Y Combinator.
- Where is Callbook AI headquartered?
- Callbook AI is headquartered in San Francisco, US.