management-insight

Startup Early Buildup Strategies Are Changing: The Era of 'Hiring People First' Is Over

According to Carta's second-half 2025 report, the median seed team size has dropped to 4 people, and average headcount for Series D companies has decreased by 29% from its peak, reflecting smaller teams across both early and late stages. Meanwhile, 25% of startups in Y Combinator's Winter 2025 batch generated over 95% of their codebase using AI, altering the very constraints of initial organizational design. Organizational structures are shifting away from functional teams toward principles of 'automated review before hiring, generalists first, and delayed management layers.' As writing code becomes cheaper, the value of problem definition, data, and distribution increases, while an investment environment heavily skewed toward AI (rising from 40% in 2025 to 54% in early 2026) places earlier pressure on non-AI startups to prove revenues. The trade-offs include pressure on core talent compensation, technical debt from AI code, and a loss of institutional learning, meaning smaller teams must bring documentation and quality checks forward.