Millie Marconi
Founder & CEO at Yesterday
I'm a founder building tech solutions with the support of venture capital. My background isn't technical, but I've found that vision and determination can take you far.I'm passionate about AI, entrepreneurship, and the startup journey. Building a company has been a continuous learning process - from working with developers to making product decisions and adapting to market feedback.Networking and community have been invaluable throughout this journey. The connections and support from fellow entrepreneurs have made all the difference.Currently navigating the messy middle of a startup pivot - that challenging space between what was and what will be. It's chaotic, uncertain, and exactly where innovation happens. Stay tuned as we navigate this transition - we're excited to share our new direction soon. The only constant is change, and at Yesterday, we're embracing it fully.
In their own words
From Millie Marconi on Building an AI to Test Content Before You Post It · In The Blink Of AIReputational risks can honestly be more devastating than business risk. So it made me more intentional about what risks to take.
Key moments
Jump straight to the part of Millie Marconi on Building an AI to Test Content Before You Post It you want.
- 2:25 What Millie’s Building: Yesterday Test Feed
- 4:52 Why Synthetic Audiences Are a Game-Changer
- 6:14 The Demo That Went Viral: Over 800 Signups
- 7:58 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
Connections
Spot something wrong? Suggest a correction Updated 25 September 2026
Want a show of your own?
W2D1 Media — the team behind the Day One Network, which helped build Blackbird Ventures' Wild Hearts — builds and produces podcasts for funds, founders and operators. If you want a show built around your brand, let's talk.
