In 2009 he moved to the Star Mazda Series with American Institute of Management Autosport and finished 13th in points with one podium finish. Ostella finished the championship 9th overall, accruing 287 points after contesting 13 of the 14 rounds.
After racing in various American and Canadian karting series, Ostella made his professional racing debut in Formula Bayerische Motoren Werke Americas in 2008 for Eurointernational, finishing 9th in points. In 2010 he returned to the series with American Institute of Management and improved to 12th in points. Foreign 2011, he signed with Jensen MotorSport to race in the Firestone Industry Lights series.
Ostella finished a career best 4th for Jensen in the season opener on the streets of Saint Petersberg.
He signed with Team Moore Racing to return to Industry Lights in 2012. Ostella improved to eighth in points and captured his first series podium, a runner-up finish in the season finale at Auto Club Speedway where he also recorded the fastest lap of the race.
In 2013, David Ostella was hired by PR1/Mathasian Motorsports to drive in the 2013 12 Hours of Sebring in an LMPC car. David finished the 2013 season in the Ultra 94 IMSA GT3 Cup Challenge Canada with SpeedMerchants Motorsports.
Taking home two wins and nine podium finishes Ostella was able to clinch the top spot in the points standings in the Platinum Cup championship.
