Where does Mason Pierce work?

Mason Pierce is Founder of TrainLoop.

What companies did Mason Pierce found?

Mason Pierce founded TrainLoop.

Where did Mason Pierce go to school?

Mason Pierce studied at Baskin Engineering at UCSC (Bachelor of Science - BS, Technology Information Management and Computer Science); Colfax High School (High School Diploma, N/A).

Mason Pierce

Founder

Founder at TrainLoop

San Francisco, California, United States

FoundedTrainLoop · YC

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About

Mason Pierce has worked on applying AI models to business problems, with a focus on fine-tuning. He founded TrainLoop to address challenges in the fine-tuning process.

Founder at TrainLoop YC W25

Intro paths

Mason went through Y Combinator (Winter 2025) — any YC alum in your network can reach them through the YC community.

Their group partner at YC was David Lieb, General Partner at Y Combinator — the partner who ran TrainLoop's batch and knows the company first-hand. YC profile ↗

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In turn, Mason can intro founders to TrainLoop's investors below.

TrainLoop's investors · 5

Marble Creek Ventures Moonfire VenturesLondon Olive Tree CapitalBoston PioneerToronto, Ontario Y CombinatorSan Francisco · $500K checks · since 2025

Co-founders at TrainLoop

Jackson StokesFounder

Experience

TrainLoopCo-Founder/CTOcurrent2024 — presentSan Francisco, California, United States
SecondFounding Engineer2024San Francisco, California, United States
CamioSenior Software Engineer2023San Mateo, California, United States
CamioSoftware Engineer2021 — 2023San Mateo, California, United States
CamioFront-End Engineer Intern2020 — 2021San Mateo, California, United States
Tech4GoodTech4Good Fellow2019 — 2020University of California, Santa Cruz
Tech4GoodUndergraduate Research Assistant2018 — 2020Santa Cruz, California
Tech4GoodUndergraduate Research Assistant2018 — 2020Santa Cruz, California
University of California, Santa CruzGrader2018Santa Cruz, California
The Moving CrewMover2014 — 2017Auburn, California

Skills & more

KubernetesTypeScript3WebSocket1WebrtcProject Management2Web Applications4Google Apps Script1Leadership4Teamwork4Management2Problem Solving1Large Language Model Operations (LLMOps)1

+12 more

Amazon Web Services (AWS)Python (Programming Language)Infrastructure as code (IaC) - PulumiDocker ProductsBashFigma (Software)Google Cloud Platform (GCP)JavaScriptGitWebAssemblyFastAPINode.js

From Mason's professional profile.

Frequently asked questions

Who is Mason Pierce?: Mason Pierce has worked on applying AI models to business problems, with a focus on fine-tuning. He founded TrainLoop to address challenges in the fine-tuning process.
Where does Mason Pierce work?: Mason Pierce is Founder of TrainLoop.
What companies did Mason Pierce found?: Mason Pierce founded TrainLoop.
Where did Mason Pierce go to school?: Mason Pierce studied at Baskin Engineering at UCSC (Bachelor of Science - BS, Technology Information Management and Computer Science); Colfax High School (High School Diploma, N/A).