Justin Fineberg’s Post

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CEO of Cassidy (we're hiring!) • 500k+ Followers (TikTok/IG) helping people automate their work with AI

When someone asks me if their startup idea is good, I ask who their cofounder is. The #1 reason startups fail is bad cofounder fit. Ian and I knew each other for over a decade before starting Cassidy. We’d already built products together, started projects, even lived together. That history meant we’d stress-tested the partnership, shared values, and aligned goals long before incorporating. Your idea doesn’t matter when you’re starting a company…it’s going to change. But you’re stuck with your cofounder. If you don’t have a great one, don’t start the company yet.

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Nosheen Shahbaz

Co-Founder @ Algogistic Solutions | Building Scalable, Future-Ready Tech Systems for Businesses

5d

💯 Spot on, ideas evolve, but a strong cofounder fit is what truly carries a startup through the chaos.

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Andile ( Andy )

Connecting founders with founding engineers & AEs who actually get it...

1w

you can literally scrap the product, pivot 10x, lose 90% of ur funding, but if your cofounder’s energy is off every moment becomes 10x worse bc you’re constantly fighting bad vibes instead of product problems.

Tracey F.

🔑 AI Ops Architect for Scale-Ups, Exits & Turnarounds | 75+ AI Deployments that actually shipped

5h

The decade-long relationship before incorporating is smart - most people rush into business partnerships after knowing someone for months. The cofounder chemistry piece is crucial though, especially when you hit those inevitable moments where everything feels broken and you need someone who won't bail. How do you advise people who have the right cofounder match but are still searching for a problem worth solving together?

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Kalob Hagen

Building the Future for Restaurants | Founder of Luigi Appetizer™ | Sharing my startup journey

6d

I’m actively seeking a cofounder but don’t know how to go about it effectively. Can you help me?

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Jarred Katz

Early Team @ Cassidy | AI-Powered Workflow Automation

1w

Two of the best founders in the game 🚀 👏 🔥

Matthew Schkolnick

Growth & Strategy @ Meow | Forbes 30 Under 30

1w

I remember meeting you guys pre-Cassidy, and there was definitely a special connection then & even more now! Pumped to follow along the journey

Tran Tien Van

Freelancer Specializing in Data Engineering and Data Science at Upwork

1w

Totally agree! That cofounder fit point is so true. I've seen great ideas crumble because of partnership issues...that pre-startup history sounds invaluable!

Jessica Silvani

Chief of Staff @ Bubble | Scaling High-Growth Tech & SaaS Organizations | Product & Engineering Strategy and Operations | Empowering Leaders & Teams to Achieve Transformational Change | Executive Partner to C-Suite

1w

So happy for you both!

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