Technical Screen

Fractional-Share Inventory

RobinhoodSoftware Engineer · Technical Screen · Sep 2026

The author describes a first-round Robinhood coding interview about handling customer trades when an exchange accepts only whole shares. The exercise tracked fractional inventory by symbol, covered purchases and sales, and included orders expressed either in shares or in money. Exchange transactions had to leave each inventory balance nonnegative and below one share after an order. The supplied f…

Shared by a candidate · reported Sep 2026. Interview formats change; use it as a guide, not a script.