StandoutStandout
Talk to Standout
Back to companies
SF Tensor
Actively Hiring

SF Tensor

SF Tensor (San Francisco Tensor Company) is a seed-stage AI infrastructure company founded in 2025 by three brothers: Ben, Tom, and Luk Koska. The company develops a 'set it and forget it' infrastruct

5 employees
Infrastructure
Seed · $500K
Founded 2025
WebsiteX / Twitter

About SF Tensor

SF Tensor (San Francisco Tensor Company) is a seed-stage AI infrastructure company founded in 2025 by three brothers: Ben, Tom, and Luk Koska. The company develops a 'set it and forget it' infrastructure layer for AI model training and inference, offering automatic kernel optimization, elastic multi-cloud GPU infrastructure, and the EMMA programming language for hardware-agnostic compute. Selected into Y Combinator's Fall 2025 batch, SF Tensor aims to free ML engineers from infrastructure overhead so they can focus on AI research.

Open positions (6)

Member of Technical Staff, GPU Kernels

Full-time
San Francisco
$285k – $315k

Member of Technical Staff, Post-Training & Applied Research

Full-time
San Francisco
$275k – $315k

Member of Technical Staff, AI-Driven Compilation

Full-time
San Francisco
$275k – $315k

Member of Technical Staff, GPU Compiler

Full-time
San Francisco
$285k – $315k

Member of Technical Staff, Sandbox Infrastructure

Full-time
San Francisco
$275k – $315k

Member of Technical Staff, Product Engineering

Full-time
San Francisco
$225k – $275k

Interested?

Let me introduce you to the founders.

Skip the process

Company details

Team Size5
IndustryInfrastructure
Founded2025

Funding

Total raised

$500K

Last stage

Seed

Investors

Y Combinator
AAngel investors (unnamed)

Founders

Ben Koska

Ben Koska

Approximately 19 years old at founding. Studied at the University of Colorado, Boulder and completed Y Combinator's founder education program. Technical focus on GPU kernel optimization. Led SF Tensor's fundraising and strategic direction. Previously conducted AI research alongside his brothers before formally founding SF Tensor.

LinkedIn
Tom Koska

Tom Koska

Twin brother of Luk Koska. Completed a Bachelor of Science in computer science at age 16. Focuses on AI infrastructure optimization at SF Tensor. Previously worked collaboratively with his brothers on large-scale AI model training and research projects.

LinkedIn
Luk Koska

Luk Koska

Twin brother of Tom Koska. Completed a Bachelor of Science in computer science at age 16. Focuses on AI infrastructure optimization at SF Tensor. Previously worked collaboratively with his brothers on large-scale AI model training and research projects.

LinkedIn

What happens next.

No applications, no recruiter spam. Just the intro.

01

Confirm the fit

A few questions to make sure this role is the right shape for you. Two minutes.

02

I pitch you to the company

I write the intro, send it to the founder, and handle the back-and-forth.

03

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.