Smith made his screen debut in 2014, appearing in two episodes of the Nickelodeon series The Thundermans. In 2015, he played the supporting role of Marcus "Radar" Lincoln in the film Paper Towns, and from 2016 to 2017 had a regular role in Baz Luhrmann's TV series Anneal.

In 2017, Smith co-starred in the off-Broadway production of Ian, for which he received Drama Desk and Lucille Lortel Award nominations. In 2018, he had a role in the film Ghost and also joined the Jurassic Park franchise, playing the role of Franklin Webb in Jurassic World 2.

In 2019, Smith had a leading role in the movie Pokémon. Detective Pikachu”, and also appeared in a production of the play “Mother” by Florian Zeller. In 2020, he played the title role in the film All the Joyful Places.

Filmography:

Year		Film
2012		Trigger Finger
2015		Paper Towns
2018		Every Day
		Jurassic World: Fallen Kingdom
2019		Pokémon: Detective Pikachu
2020		All the Bright Places
		Query
2021		The Voyeurs
		Ron's Gone Wrong
2022		Jurassic World: Dominion
2023		Dungeons & Dragons: Honor Among Thieves
		Sharper