SAN FRANCISCO — The lawyer seeking to revive a gender discrimination class action against Twitter Inc. faced pushback Thursday from a California appellate panel about whether the company had a uniform policy regarding the promotion of software engineers.

Jason Lohr of San Francisco’s Lohr Ripamonti & Segarich, who originally sued Twitter in 2015 on behalf of one of the company’s first female engineers, Tina Huang, told a three-judge panel of the First District Court of Appeal that testimony from the company’s own human resources official, as well as hundreds of pages of policy documents, showed that Twitter had a “single promotion process.” Lohr indicated that the company managers were the gatekeepers to promotion decisions and that the company had set criteria for who was worthy of promotion—criteria referred to internally as “Impact” and “How.” The overall policy, he argued, had a disparate, negative impact on women seeking to move up the ranks at Twitter.