She began her practice at Weil in the Houston and Dallas offices where she handled federal- and state-court litigation and arbitration. She was actively involved in diversity efforts, recruiting, and mentoring at Weil and later, Giana practiced litigation at Sidley Austin LLP in Dallas.

Giana finished law school at the University of Houston Law Center as Senior Articles Editor of the Houston Law Review. During law school, she worked as an intern for the First Court of Appeals in Houston, Texas and as a summer associate for Haynes & Boone (Dallas and Houston) and for Weil, Gotshal, & Manges (Dallas). Following law school, Giana served as law clerk to the Honorable Judge Jorge Solis of the United States District Court for the Northern District of Texas in Dallas.

Giana is a member of the Supreme Court Advisory Committee (appointed by order of the Texas Supreme Court), a past Chair for the State Bar of Texas Court Rules Committee (appointed by the State Bar President), and has served as the Chair of the State Bar School Law Section of attorneys (member-elected). She is an active member of the Board of Directors for the Arlington ISD Education Foundation and has previously served as a mentor for the Big Brothers Big Sisters Mentor 2.0 program in the Fort Worth Independent School District, among other community involvement. Giana received the Texas Bar CLE Standing Ovation award for Outstanding Volunteer in 2023. Giana is a member of the 2009-2010 State Bar of Texas Leadership Class; and other former appointments and memberships include the State Bar of Texas’s Texas Minority Council Program planning committee, Houston Bar Association Gender Fairness Committee, Dallas Diversity Task Force, Tarrant County Women Attorneys Section board, Tarrant County Bar Association Diversity Committee, and Houston Law Review Diversity Initiative.

Giana is a frequent writer and presenter on ethics, general and employment litigation, school law, and civil procedure.