Parallel Bio YC Application

Summer 2021Active

Parallel Bio went through Y Combinator in the Summer 2021 batch as a Healthcare 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: Summer 2021
Industry: HealthcareDrug Discovery and Delivery
Team size: 20
Status: Active
Launched: 2021

Founders

Robert DiFazioFounder
Juliana HilliardFounder

What Parallel Bio does

Parallel Bio is pioneering human-first drug discovery by creating the first map of human biology. Using groundbreaking biological and computational tools that track real clinical outcomes, the company generates data that enable earlier, more reliable decisions about disease biology and drug development. Parallel Bio’s platform overcomes the core limitations of traditional animal testing, which fails to encapsulate the complexity of human biology. The company is building internal pipelines of novel disease targets and drug candidates in both cancer and autoimmune disease, while collaborating with pharmaceutical companies to evaluate therapies directly in human systems to reduce the cost and risk of clinical trials. Based in San Francisco, the company was founded in 2021 by two of the world’s leading experts in replacing animal models with human-first platforms.

Parallel Bio's YC application, reconstructed

Y Combinator application

Parallel Bio, Summer 2021 batch. The real form questions, answered from public data.

Founders2
Company7
Progress7
Idea4
Equity3
Curious2
Batch Preference1

Company

Company name

Parallel Bio

Describe what your company does in 50 characters or less.

Using the immune system to cure disease

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

We're building the first comprehensive map of human biology by tracking real clinical outcomes with biological and computational tools. Our platform bypasses animal testing by focusing directly on human systems to identify new disease targets and drug candidates, mainly in cancer and autoimmune diseases. We also collaborate with pharma to test therapies on human tissue to reduce clinical trial risks.

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

We live in San Francisco, and the company will be based here after YC.

Explain your decision regarding location.

San Francisco is the biotech and AI hub we need to build our human-first drug discovery platform and collaborate with pharmaceutical partners.

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 Parallel Bio YC application?

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