Founder · Full-stack engineer
Sagar Dey.
“I build products end to end — from the first commit to the launch.”
Founder of MirrorCut and HypoMatrix. I design, engineer and ship — agent, backend, frontend and the deployment pipeline behind them.
Now
Building MirrorCut — an AI video editor
For creators and small brands who work from their own recordings. Upload your footage, describe the edit — the agent cuts, captions, reframes and adds motion graphics, and every change lands on a real timeline you keep or undo.
MirrorCut
AI video editing that works like a teammate: describe the cut, review it on a real timeline, keep or undo every change. From the agent to the renderer, built in-house.
HypoMatrix
A product studio building web and mobile applications for businesses and startups — shipped end to end, strategy to production.
Experience
From engineer to founder
- 2026 — PresentFounder · MirrorCut
Building an AI video editor, from the agent to the renderer.
- 2023 — PresentFounder · HypoMatrix
Web and mobile applications for businesses and startups.
- 2023Chief Technology Officer · CoFoundersLab
Promoted to lead engineering for the platform that connects founders with co-founders and investors.
- 2022 — 2023Software Engineer · CoFoundersLab
Shipped across the stack for the founding team.
Selected work
Shipped, live, in production
MirrorCut
Founder
An AI video editor that turns your own recordings into ads, Shorts and finished videos.
HypoMatrix
Founder
A product studio building web and mobile applications for businesses and startups.
Upfounder Builder
AI product
An AI website builder that re-imagines any website in seconds.
Upfounder Studio
AI product
An image and video generation studio: one prompt bar, each model's settings, one gallery.
ZeeWork
Marketplace
A freelance marketplace to post jobs, review proposals and pay vetted freelancers securely.
GooodMail
SaaS
An email marketing and automation platform for campaigns, transactional email and contact lists.
Sportinerd
Sports platform
Live scores, sports data analytics, news and interactive fan challenges.
U-Center
Affiliate platform
An affiliate hub where ambassadors earn rewards and commissions across their network.
Podcast & content
Trigger Point.
Conversations with founders, operators and freelancers on building products, finding customers and getting 1% better every day.
Aug 2026
The CEO's Biggest Lie: Why Your Product Is Actually Failing
Aug 2026
Founders Get This Wrong: Why Customer Success Must Start Early
Aug 2026
Will AI Replace Marketers? The Truth Is Scarier Than You Think
Aug 2026
Marketing vs Product: Is Strategy More Important Than Execution?
Jun 2026
How To Get Your First Client as a Freelancer
Jun 2026
5 Things You Must Know Before Starting Freelancing
The stack I build with
About
About Sagar Dey
- Who is Sagar Dey?
- Sagar Dey, also known as Sagar D and Shaunak, is a founder and full-stack engineer. Sagar is the founder of MirrorCut, an AI video editor, and HypoMatrix, a product studio building web and mobile applications, and the host of the Trigger Point podcast.
- What is MirrorCut?
- MirrorCut is an AI video editor founded by Sagar Dey in 2026. Creators and small brands upload their own recordings and describe the edit; MirrorCut's agent cuts, captions, reframes and adds motion graphics on a real timeline they can keep or undo.
- What is HypoMatrix?
- HypoMatrix is a product studio founded by Sagar Dey in 2023 that builds web and mobile applications for businesses and startups, end to end from strategy to production.
- What has Sagar Dey built?
- Besides MirrorCut and HypoMatrix, Sagar Dey has worked on products that are live in production, including Upfounder Builder, Upfounder Studio, ZeeWork, GooodMail, Sportinerd and U-Center. Earlier, Sagar was CTO of CoFoundersLab.
- What is the Trigger Point podcast?
- Trigger Point is Sagar Dey's podcast and YouTube channel (@deysagarofficial): conversations with founders, operators and freelancers on building products, finding customers and getting 1% better every day.
- How can I contact Sagar Dey?
- Email sagar@mirrorcut.ai or sagar@hypomatrix.com, or reach Sagar on LinkedIn (linkedin.com/in/deysagar) or X (@sagardeyofc).