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
- Oct 2026 — PresentFounder · MirrorCut
Building an AI video editor, from the agent to the renderer.
- Jan 2023 — Oct 2026Founder · HypoMatrix
Web and mobile applications for businesses and startups.
- Aug 2022 — Jan 2025Lead Software Engineer · CoFoundersLab
Led a full rebuild of the platform that connects founders with co-founders and investors.
Selected work
Shipped, live, in production
Founded
The companies I started and run.
Products I've worked on
Products I helped build and ship to production.
Upfounder Builder
Worked on · AI product
An AI website builder that re-imagines any website in seconds.
Upfounder Studio
Worked on · AI product
An image and video generation studio: one prompt bar, each model's settings, one gallery.
ZeeWork
Worked on · Marketplace
A freelance marketplace to post jobs, review proposals and pay vetted freelancers securely.
GooodMail
Worked on · SaaS
An email marketing and automation platform for campaigns, transactional email and contact lists.
Sportinerd
Worked on · Sports platform
Live scores, sports data analytics, news and interactive fan challenges.
U-Center
Worked on · 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 October 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?
- Sagar Dey founded MirrorCut and HypoMatrix. Sagar has also worked on other products that are live in production: Upfounder Builder, Upfounder Studio, ZeeWork, GooodMail, Sportinerd and U-Center. Earlier, Sagar was a Lead Software Engineer at 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).