SEATTLE — In 2019, a mid-level employee at Jeff Bezos’s Blue Origin had grown fed up with the company, and as he left, he wrote a long memo that he sent to Bezos, chief executive Bob Smith and other senior leaders: “Our current culture is toxic to our success and many can see it spreading throughout the company.” The problems at the spaceflight company were “systemic,” according to the memo, which was obtained by The Washington Post and verified by two former employees familiar with the matter, and “the loss of trust in Blue’s leadership is common.”