Amazon

Microsoft

Apple

Marc Krejci

8-time founder. 7.5 years at Meta. 20+ years of zero-to-one launches.

Cohort #1

Cohort 2

Cohort 1

Startup founders building new businesses, from MVP to scale.

Conducting user interviews, surveys, and usability studies to understand customer needs and validate decisions.

Identifying opportunities and validating what to build through customer research, experimentation, and prioritization.

Finding and validating product-market fit — identifying underserved markets, testing hypotheses, and iterating to fit.

Four weeks of structured practice. Four deliverables. One sent Design Partnership Agreement.

Founder, ProtoVibing.ai

Product-Market Fit Without Guessing

Founder

Spotify

Building has never been easier. Validation has never mattered more.Most early-stage founders are stuck in the same trap: build fast, ship something, wait for traction that doesn't come. Then realize they were solving the wrong problem for the wrong person. The root cause is almost always accountability and process: you know what to do, and nothing is holding you to doing it.In four weeks, you'll run a complete validation loop end to end using a proven <a target="_blank" rel="noopener noreferrer nofollow" href="https://protovibing.ai">human-driven agentic flywheel</a>: sharpen a real bet, build a clickable prototype with AI agents, put it in front of real customers, synthesize the signal, and make a commit decision backed by evidence.You leave with a tested prototype and a sent Design Partnership Agreement. AI agents accelerate the synthesis and the building. The conversations with real humans are yours to have. No synthetic shortcut.Every session is live demonstration, group practice, and a public commit the cohort holds you to.

Real customers. AI agents. The Human-Driven Agentic Flywheel.

The Validation Mindset

The Interview That Tells the Truth

Synthesize and Iterate

Commit and Close a Design Partner

This course is not for the pre-idea stage. You need a hypothesis, even a rough one, that you're trying to pressure-test with real humans.

You have an idea or early MVP to validate

Customer discovery means real conversations with real people. The cohort provides structure and accountability. The reps are yours to do.

You're willing to talk to strangers

The vibe coding tools in this course are designed for non-technical founders. If you can describe it, you can build it.

No engineering background required for prototyping

Early-stage founders with an MVP that isn't gaining traction and a hunch they haven't validated the right problem yet.

Solo technical founders who build fast but avoid customer conversations because they don't have a repeatable process for them.

Repeat founders or corporate operators going independent who want a rigorous zero-to-one validation framework, not theory.

Marc Krejci will make validation your superpower in the AI era

Marc Krejci

Courses

Product-Market Fit Without Guessing

Lightning Lessons

Validate Your Idea Live with v0

How to Turn AI Prototypes into Validated Products

Resources

Presentation: How to Turn AI Prototypes into Validated Products