The biggest scaling mistake is focusing on running up numbers while ignoring the underlying mindset. During its peak growth, Facebook put every new engineer through a six-week bootcamp not for immediate productivity, but to instill the company's culture. This investment in a shared mindset is what enables sustainable scaling, preventing the chaos that comes from rapid headcount growth.

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Success is often attributed not to a relentless personal grind, but to a superpower in attracting and retaining top talent. True scaling and outsized impact come from empowering a great team, embodying the idea that "greatness is in the agency of others."

Resist hiring quickly after finding traction. Instead, 'hire painfully slowly' and assemble an initial 'MVP Crew' — a small, self-sufficient team with all skills needed to build, market, and sell the product end-to-end. This establishes a core DNA of speed and execution before scaling.

The true ROI of a great company culture is operational velocity. Long-tenured employees create a high-context environment where communication is efficient, meetings are shorter, and decisions are faster. This 'shared language' is a competitive advantage that allows you to scale more effectively than companies with high turnover.

To scale from 100 to 1,000+ employees, you must stop interviewing everyone. Success depends entirely on the cultural foundation built with the first 100 people. By personally hiring and imbuing them with the company's core values, you create a group of leaders who can replicate that culture as the organization expands.

Contrary to the popular bottoms-up startup ethos, a top-down approach is crucial for speed in a large organization. It prevents fragmentation that arises from hundreds of teams pursuing separate initiatives, aligning everyone towards unified missions for faster, more coherent progress.

When Facebook's growth stalled due to new engineers breaking the codebase, Zuckerberg instituted a mandatory, two-month bootcamp for all new engineers and PMs. This systemically solved the knowledge gap, allowing the team to scale effectively.

The most durable growth comes from seeing your job as connecting users to the product's value. This reframes the work away from short-term, transactional metric hacking toward holistically improving the user journey, which builds a healthier business.

In 2007, Facebook's traffic flattened after doubling its engineering team because new hires didn't understand the system architecture. This taught a young Zuckerberg a crucial lesson: at scale, knowledge must be taught explicitly. He then created a mandatory two-month bootcamp for all new product and engineering hires.