This news comes just ahead of Uber's board of directors meeting in Los Angeles on Sunday to discuss the findings of an investigation into the ride-hailing company by former attorney general Eric Holder.
The report was commissioned by Uber following misconduct at the firm including allegations of sexual harassment made by former employee Susan Fowler.
The company hired former United States attorney general Eric Holder in February after an ex-engineer penned a blog post about the "strange" year she experienced while at Uber. The Board unanimously voted to adopt all the recommendations of the Holder Report.
Key unfilled positions include chief operating officer, chief financial officer, chief marketing officer and general counsel - an astonishing list for a company that has more than $7 billion (€6.25 billion) in annual revenue and which was valued at $68 billion (€60.7 billion) by investors previous year.
San Francisco-based Uber is valued at almost $70bn (£55bn) but is yet to make a profit.
Last week, Uber fired more than 20 employees, following a separate investigated by Perkins Coie. Yet even in Silicon Valley, where propriety can take a back seat to profits, the claims about Uber's corporate culture have been startling, ranging from sexual harassment to the mishandling of the medical records of a woman raped by an Uber driver. To top it all off, the company's CEO Travis Kalanick had to take a leave of absence due to the tragic accident involving his parents. In part, the move was done because some executives at Uber were reportedly skeptical about the assault and believed it was orchestrated by Ola, a local competitor.
Uber's board consists of seven members including; TPG Partner David Bonderman; Huffington Post co-founder Arianna Huffington; venture capitalist Bill Gurley of Benchmark; an official from a Saudi Arabian government investment fund; co-founder Garrett Camp (chairman); Uber SVP Ryan Graves; and Mr. Kalanick himself. The 40-year-old CEO said earlier this year that he needed to "fundamentally change and grow up".
That firm checked into 215 complaints, with 57 still under investigation. Ever since 2009, Kalanick has worked endlessly to make Uber what it is now, a near $70 billion entity. The former employee said Uber suffered from a chaotic companywide culture of sexism and unprofessional business practices that had serious work-flow consequences, including the abandonment of projects and altered objectives. Saint John most recently was head of global consumer marketing for Apple Music and iTunes.