Who founded SF Tensor?

SF Tensor was founded by Ben Koska, Luk Koska, Tom Koska in 2025.

Who are SF Tensor's investors?

SF Tensor's investors include Y Combinator.

Where is SF Tensor headquartered?

SF Tensor is headquartered in San Francisco, US.

SF Tensor

San Francisco, US · Founded 2025 · 6 employees · Hiring · 1 known investors

SF Tensor builds software and infrastructure for high-performance AI and HPC workloads, offering automatic kernel optimization and cross-cloud compute management to reduce costs and complexity for research teams. The company provides Tensor Cloud (managed GPU orchestration), a Kernel Optimizer, and the Emma programming language to abstract hardware differences while maintaining performance.

Also known as Emma Lang

AI & Machine Learning Cloud Computing Data & Infrastructure Developer Tools Enterprise Software

Founders & leadership· Y Combinator alumni (F25)

SF Tensor was founded in 2025 by Ben Koska, Luk Koska, and Tom Koska.

Ben Koska inFounderThe company builds software and infrastructure for high-performance AI and HPC workloads, including managed GPU orchestration, a kernel optimizer, and a programming language that abstracts hardware differences across vendors.

Luk Koska inFounderLuk Koska completed a BSc in Computer Science and currently works on AI infrastructure optimization at SF Tensor.

Tom Koska inFounderTom Koska completed a BSc in Computer Science at age 16 and currently works on AI infrastructure optimization at SF Tensor.

Investors · 1

Y CombinatorSan Francisco · $500K

The YC application· Fall 2025 batch

Alumni Q&A

What is the core problem you are solving? Why is this a big problem? What made you decide to work on it?: The founders observed that AI labs and startups spend significant time on cloud infrastructure setup, debugging distributed training, and GPU procurement instead of research. While training their own models, they estimate they spent 60% of their time on infrastructure and 40% on research, and found other teams faced the same issue. They started the company to reduce this overhead.
What is your long-term vision? If you truly succeed, what will be different about the world?: The founders aim to make hardware from vendors such as AMD GPUs, TPUs, and Trainium equally usable in order to increase compute supply and reduce reliance on NVIDIA. Their goal is to let researchers train advanced models working only from their PyTorch code, without dedicated infrastructure teams or GPU rental negotiations.

Summarized from the founders' answers on their Y Combinator profile.

Images

Competitors · 3

by search overlap

Tensorwave9 shared keywordsTensorWave provides a cloud platform for training and running AI workloads, built on AMD Instinct GPUs and the ROCm software stack. It offers infrastructure, expert engineering support, and monitoring for AI teams seeking to train and scale models without vendor lock-in.

SF Compute8 shared keywordsSan Francisco Compute sells time on large-scale GPU clusters through contracts that customers can exit by reselling capacity on its liquid market. It operates the clusters directly with its own virtualization and bare-metal stack, serving AI and infrastructure customers who need scalable GPU compute without long-term commitments.

Tenstorrent7 shared keywordsTenstorrent designs and manufactures AI hardware accelerators and develops open-source software tools for deploying and running large language models at scale. The company serves AI developers and enterprises with customizable compute systems ranging from desktop devices to production-grade servers.

Companies competing with SF Tensor for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

SF Tensor - Infrastructure for the Era of  Large-Scale AI Training ⚡ycombinator.com · Nov 2025

Frequently asked questions

What does SF Tensor do?: SF Tensor builds software and infrastructure for high-performance AI and HPC workloads, offering automatic kernel optimization and cross-cloud compute management to reduce costs and complexity for research teams. The company provides Tensor Cloud (managed GPU orchestration), a Kernel Optimizer, and the Emma programming language to abstract hardware differences while maintaining performance.
Who founded SF Tensor?: SF Tensor was founded by Ben Koska, Luk Koska, Tom Koska in 2025.
Who are SF Tensor's investors?: SF Tensor's investors include Y Combinator.
Where is SF Tensor headquartered?: SF Tensor is headquartered in San Francisco, US.