Millie Marconi is the founder and CEO of Yesterday, and the creator of Test Feed, a breakout AI tool that lets users preview how their content will land with a synthetic audience before posting it online. In this episode, Millie shares the story behind building Test Feed after a viral LinkedIn post backfired and sparked a personal reckoning around reputational risk. We explore how synthetic audiences are making elite-level brand testing accessible to everyday founders, why building in public is both terrifying and empowering, and what non-technical founders can bring to the AI table. Millie also opens up about her nomadic lifestyle, her favorite AI tools (Claude and Gemini, anyone?), and the unexpected upside of being “canceled.”
Chapters
02:25 – What Millie’s Building: Yesterday & Test Feed
04:52 – Why Synthetic Audiences Are a Game-Changer
06:14 – The Demo That Went Viral: Over 800 Signups
07:58 – How a Personal Misstep Sparked the Idea for Test Feed
10:43 – Who Test Feed Is For: Founders, Content Creators, and Social Media Managers
13:11 – Building in Public vs. Stealth Mode
16:48 – Female Founders, Visibility & Vulnerability
19:52 – What Non-Technical Founders Bring to the AI Era
22:45 – Integrating AI into Test Feed as a Non-Technical Founder
26:20 – AI Tools Millie Loves: Claude, Cursor, Gemini, and More
33:43 – Just Play: How to Get Started with AI Without the Overwhelm
36:06 – Digital Nomad Life: Lessons From 2.5 Years on the Move
42:17 – Rapid Fire: Guess That Cringe Tweet (Trump vs Elon Edition)
Resources
🙋♀️ Follow Millie on LinkedIn - https://www.linkedin.com/in/millie-marconi/
💼 Yesterday Testfeed - https://yesterday.work/
🧵 Millie’s LinkedIn Post on “Masculine Energy” - https://www.linkedin.com/posts/millie-marconi_after-interviewing-100-hr-leaders-about-activity-7284745207923781632-QU-X?utm_source=share&utm_medium=member_desktop&rcm=ACoAACb9cQIBMRvkSzVlzjznYUqzAEsWp-Q5zBo
This Episode Is Brought To You By
More Episodes You Might Like
Let's talk
Turn podcasting into pipeline
We help founders, funds and operators build trust, authority and deal flow with a show tailored to their market.
Win better deals and stay top‑of‑mind with founders.
Close more deals and build a category you own.
Reach founders and operators with a show they trust.
