What do the best computer programmers have in common?
Eric Barker stashed this in Tech
The most important factor was the comforts afforded to them by their work environment: "... top performers overwhelmingly worked for companies that gave their workers the most privacy, personal space, control over their physical environments, and freedom from interruption."
Via Quiet: The Power of Introverts in a World That Can't Stop Talking:
Those seem like characteristics of a great startup culture.