2x founder

Manuel Castro

Co-Founder @ Paper Star | YC P26 | Ex-Verkada · Ex-Sonos

Co-founder

2026Co-founder· Napkin Math

Founder · since 2021

Company

Napkin Math

Role

Co-Founder

current

Stage

—

no public source

Raised

—

no public source

Based

San Francisco, California, United States

current

Founder / co-founder — the company's markEmployee / research role

Profile coverage5 of 7 · missing posts, contact

Napkin Math

AI nutrition coach in your pocket

Experience

Career

Napkin Math
Co-founder
Co-Founder · San Francisco, California, United States · 2026 – Present
2026
Verkada
Group Product Manager · 2025 – 2026
2025
Verkada
Lead Hardware Product Manager · San Mateo, California, United States · 2024 – 2026
2024
Verkada
Senior Hardware Product Manager · San Mateo, California, United States · 2023 – 2024
2023
Artera
Founder
Senior Product Manager · 2021 – 2023
2021
Sonos, Inc.
Senior Product Manager - Consumer Experience · 2021
2021
Sonos, Inc.
Senior Product Manager - Product Data · 2020 – 2021
2020
Sonos, Inc.
Product Manager - Product Data · Santa Barbara, California · 2017 – 2021
2017
Sonos, Inc.
Product Management Intern · Santa Barbara, California · 2016
2016
Pentelute Laboratory
Mechanical Engineering Assistant · MIT · 2015
2015
GTL Mexico
Teacher · 2015
2015
Device Research Laboratory (MIT)
Lab Assistant · 2014
2014
MIT Alumni Association
Tech Caller · 2013
2013

Napkin Math is the hyper-personalized AI food journal that helps people achieve their health goals. Previously: Sonos, Healthcare Tech, Verkada