Cosine YC Application

Winter 2023Active

Cosine went through Y Combinator in the Winter 2023 batch as a B2B company. Below: what the company does, who founded it, and its application to YC, reconstructed question by question in the real YC form.

YC batch: Winter 2023
Industry: B2B
Team size: 12
Status: Active
Launched: 2022

Founders

Alistair PullenFounder
Yang LiFounder

What Cosine does

Cosine is a fully agentic SWE that allows you to instantly work on every single ticket at once, asynchronously.

Cosine's YC application, reconstructed

Y Combinator application

Cosine, Winter 2023 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Cosine

Describe what your company does in 50 characters or less.

Fully Agentic SWE

What is your company going to make? Please describe your product and what it does or will do.

Cosine is a software development tool that functions as a fully agentic software engineer, allowing engineering teams to work on every ticket asynchronously and simultaneously. It manages and executes tasks across the board, freeing developers from switching contexts and coordinating work actively.

Where do you live now, and where would the company be based after YC?

We live and work in London, England, and Cosine would remain based here after YC.

Explain your decision regarding location.

We chose London because it has a strong technical talent pool and access to customers in both European and global markets. Our founders are based here and our early development and user feedback are from companies in this region.

21 more answers in the full application

Founders, Progress, Idea, Equity, Curious, Batch Preference are in the full version. Create a free account to open it in YC Insights, next to every other YC batch.

See full application

Frequently Asked Questions

Is this the real Cosine YC application?

No. Y Combinator keeps submitted applications private. This is a reconstruction: the real YC form questions, answered from Cosine's public data (launch notes, founder backgrounds, product description). It shows how a company like Cosine would present itself to YC, not the text they submitted.