The engineer whose blog post kicked off an internal storm at Uber isn’t done speaking up about her former employer.

Ex-Uber engineer Susan Fowler has filed an amicus brief (PDF) with the Supreme Court, weighing in on a case about arbitration and an employee’s rights to file a class-action lawsuit. Fowler’s February 2017 blog post, titled "Reflecting On One Very, Very Strange Year At Uber," described “her futile attempts to address workplace harassment, discrimination, and retaliation on the job."

Fowler’s post led to an investigation by former Attorney General Eric Holder, which has resulted in major changes at Uber , including the firing of at least 20 employees and the resignation of former Uber CEO Travis Kalanick.

The brief is a full-bore attack on the viewpoint, often espoused by the Chamber of Commerce and other business groups, that arbitration is simply an inexpensive and efficient way to resolve disputes. The process is neither cheap nor efficient, Fowler points out. Arbitrators charge fees that range from $300 per hour to $15,000 per day, and both sides still need to hire attorneys to represent them, at prevailing rates.

The main goal of arbitration, the brief argues, isn’t to save money. Rather, Fowler's attorney Chris Baker says that arbitration serves the purpose of limiting risk to large corporations and depriving employees of their right to take collective legal action via class-action lawsuits. (An arbitration agreement is generally needed to get employees to waive class-action rights.)

"The right to litigate collectively is particularly important in the 21st century in that such litigation is the most readily available means for modern day workers to act in concert to improve their working conditions," writes Baker.

Uber employs 6,000 W-2 employees and 600,000 "1099 drivers." The company considers the drivers independent contractors, although that status has been challenged in court.

"For Uber, even 1,000 very expensive individual arbitrations is exponentially cheaper than a single class-action judgment," Baker writes.

The class-action waiver strategy is widespread throughout the tech sector. Both Google and Facebook, among many others, require workers to agree to arbitration and waive their class-action rights.

Fowler argues that class-action rights are more important than ever in the era of telecommuting and the “gig economy,” where the traditional collective actions of strikes and picket lines is less tenable. The brief cites one post-college survey that estimates that by 2020, one in three workers will be hired to work online.

Her brief was filed in a case called Epic Systems Corp. v. Lewis, which is scheduled to be heard by the US Supreme Court on October 2. The brief was filed last week and first reported yesterday by The Recorder.