Welcome to Seth Weidman's Website

I'm a passionate builder and problem solver with deep product management experience, currently returning to my AI roots and learning everything I can about what's happening technically in the field.

Backpacking in Grand Staircase Escalante National Monument, May 2021

Recent Blog Posts

• Streaming Softmax and Softmax-Dot
• Tiling Matrix Multiplication on the GPU: Using CUDA and Shared Memory

Professional Bio

SentiLink

I worked at SentiLink, for almost six years, from December 2019, when the company was about two-and-a-half years old, to November 2025. The company 100xed in ARR and grew from 15 employees to about 150. Roughly, my role breakdown was:

• A full stack data scientist, including a lot of machine learning engineering, for the first two years, reporting to the head of Data Science (I was the first hire on the team).
• A hybrid data scientist/product manager for the next three years, reporting to one of the co-founders, Maxwell Blumenfeld. Here I launched the two most successful TAM-expanding products at SentiLink, the second one of which I architected from the ground up. Blog post coming on this soon!
• A product manager reporting to the CEO, Naftali Harris, for the last year.

It was an incredibly unique experience to be part of a venture-backed company - I joined about one-third of the way between the a16z-led Series A and the Craft Ventures-led Series B - and do work that was so central that I got to work with and directly observe every function of the company. An incredible learning experience: I became a much better engineer / builder while getting a "startup MBA" x10!

Conference Speaking

During my last year at SentiLink, I got back into speaking at Data Science conferences, breaking down the trickiest concepts at the bleeding edge of AI into understandable chunks.

• In May 2025, I spoke at ODSC East in Boston on PPO, GRPO, and how to fine-tune an 8B parameter Llama model to do better at answering math questions. See the official talk page here.
• In October 2025, I spoke at ODSC West in Burlingame. The unofficial title of my talk was "Coding Agents are Just while Loops". View the talk details here.

Prior to SentiLink, I also spoke at Data Science conferences regularly.

Data Science Author

In September 2019, O'Reilly published an introductory book I wrote covering the mechanics of Deep Learning models: Deep Learning From Scratch.

Personal

• In July 2025, after about seven years of living in the Bay Area, I moved to Holladay, Utah.
• I like doing big long hikes with a lot of elevation gain and loss. In May 2025, I climbed Mt. Shasta in one push from the Bunny Flat trailhead to the summit and back, which is 7,200 feet of elevation gain / loss and 7.2 miles each way. It took 12 hours and 50 minutes: I began at 11:30 PM and returned at 12:20 PM the next day. I hope to improve upon this time in the future.
• I graduated from the University of Chicago with a double major in Mathematics and Economics in 2012.
• I'm originally from Pittsburgh, PA.
• I taught myself to juggle around age nine and can still juggle to this day.

Old Blog Posts

• Character Strengths Affirmations Practice
• O1 Pro - An Initial Assessment