Opmeer graduated to single-seaters in 2016, participating in the SMP F4 Championship. He took seven victories and thirteen podiums in his debut year of F4, finishing second place in the championship to fellow countryman Richard Verschoor.
Opmeer also participated in two race meetings of the Spanish F4 with MP Motorsport, taking 5 podiums out of 6 races.
In April 2019, Opmeer was signed to Renault–Vitality Esports Team as a driver for the third season of the F1 Esports Series.[5] The Dutchman finished his first season in the competition in fourth place and helped secure his team 4th place in the teams' championship.[6]
On 26 January 2021, Opmeer announced that he has signed with the Mercedes Formula One Esports team.[8] On 16 December 2021, Opmeer won the 2021 Formula One Esports Series.[9] He achieved 4 wins and 7 podiums, edging out championship rival Fredrick Rasmussen with 9 podiums by just 8 points.
The 2022 season proved to be much more difficult for Opmeer, as his struggles in qualifying heavily affected his race results. However, he won 2 races back-to-back and finished fifth overall in the championship.
Jarno began the 2023–24 season by finishing second in Bahrain from P9 on the grid.[10] With continued struggles in qualifying pace he would only achieve a single win this season, at Silverstone, achieving 4th overall in the drivers championship. After the season, Opmeer leaves Mercedes Formula One Esports team.[11]
As a free agent driver, Jarno signed a multi-year deal with Red Bull Sim Racing on 21 August 2024, joining Frederik Rasmussen on the team.[12]
Formula E: Accelerate
In 2021, Opmeer was signed to the Mercedes-EQ Formula E Team to compete in the esport series Formula E: Accelerate. In his first year he finished fifth overall in the standings, scoring his debut podium in the final round set in Rome.
In the double-header London Open in 2022 Opmeer finished second overall.
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