Women hold roughly 8 to 15 percent of CTO and CIO roles worldwide, and the numbers have barely moved in a decade. Researchers who study the pipeline describe the problem as a “broken rung” rather than a glass ceiling: women don’t fall at the top of the ladder, they get filtered out at every step on the way up. First promotion. First technical leadership role. First company. Which makes Saima Mushtaq a useful case study, because over twenty years…