Jack Altman on Product-Market Fit

Jack Altman shares his career trajectory from investment banking to early startup employee at Teespring, then co-founding Lattice (which reached a $3 billion valuation), and now investing through AltCapital with a $275 million first fund. He credits the experience of working at a small YC-backed company as the catalyst that made him want to found his own startup, driven partly by a 'regret minimization' framework similar to Jeff Bezos's.

On product-market fit, Altman emphasizes that when something works, it typically works fast. He argues that the clearest signal of weak PMF is when a team keeps saying 'one more feature' without getting genuine pull from customers. He describes Lattice going through three pivots before finding traction with performance reviews, noting that they sold the product before it was fully built — his co-founder was literally coding the ability to close a review cycle as customers were using it for the first time.

The tension between customer requests and product vision is a central theme. Altman argues that neither blindly following every customer request nor ignoring all feedback is correct. He describes the difficult judgment call of large enterprise customers offering significant ARR in exchange for custom features that no other customer has requested, and acknowledges this is rarely as simple as it seems — the work always takes longer than a month and customers always have more asks.

Regarding co-founder dynamics, Altman says his partnership with Eric Koslow succeeded due to pre-existing trust from Teespring, clear division of responsibilities with minimal second-guessing, and a relationship where arguments were always about ideas rather than personal attacks. He believes that without that relationship, either of them might have quit before reaching PMF.

On early hiring, Altman argues that founders must find 'diamonds in the rough' — people who are genuinely great but not yet legibly great to the broader market, since obviously great candidates have too many better options. He also notes that early sales reps should be entrepreneurial rather than process-driven, as the sales process itself hasn't yet been figured out.

For fundraising, Altman advises running a compressed, wide-funnel process, not engaging with investors who are trying to pull founders into premature processes, and noting that a term sheet is the only real signal of investor intent. He observes the current market is highly momentum-driven, particularly around AI companies.

Finally, Altman reflects on how the AI era has changed startup building — much of the core technology now lives at frontier labs, which fundamentally changes the role of the founder from building core technology to channeling external capabilities in unique ways. He also advocates for proactive versus reactive work as a key compounding habit for CEOs.