Robb received a go-kart at age five. He started running nationally at age eight, entering Cadet division events from 2010 to 2013. During his first season in the Junior ranks he finished second in America and raced in Valencia, Spain. He won a national championship in Rotax Junior Max karting in 2015, and also raced go-karts in Portugal. In 2015, Robb achieved second place in the Karts to Car Scholarship Shootout, earning a US$15,000 scholarship to race in the Skip Barber Race Series.
In late 2016, Robb made his NASCAR K&N Pro Series West debut in Utah, becoming the youngest driver ever to participate in the series. He competed in the NASCAR K&N Pro Series West 2018 NAPA Auto Parts Idaho 208, finishing tenth.
Robb switched from go-kart racing to car racing in 2015. He raced in the Skip Barber Winter Series that winter and finished second in the standings. After winning a race in the Formula Car Challenge driving part-time for World Speed Motorsports, he joined the team ahead of the 2017 Pro Mazda Championship. As the youngest driver on the grid, he started the year with fourth place in race 2 at St. Petersburg. Further fourth places followed at Road America and Watkins Glen, as well as fifth at Mid-Ohio, with Robb finishing sixth in the points standings. He remained in Pro Mazda the following season driving for Team Pelfrey. Thanks to a last-lap pass on teammate Andrés Gutiérrez, Robb finished a season-best result at Indianapolis. Despite three further top fives, he dropped to seventh in the championship.
In 2019, Robb joined Juncos Racing as part of their Indy Pro 2000 roster. He finished third at the season opener in St. Petersburg. Though a lockup cost him a podium in the first Indy race, he bounced back with second place in race 2 after holding off Danial Frost. He battled Kyle Kirkwood on the Lucas Oil Raceway oval to finish second. A mechanical issue at Road America and a crash in a battle for second in Toronto were setbacks before Robb returned to the podium in race 2 at Mid-Ohio. He scored his maiden pole at Portland but was punted into a spin by Artem Petrov at the start. In race 2 of the Portland weekend he finished second. He then took pole and led the most laps at Laguna Seca before experiencing strong tyre wear in the closing laps, eventually finishing second. Robb finished fourth in the overall standings.
For the 2020 Indy Pro season, Robb returned to Juncos. He started by finishing second at Road America and third in race 2 at Mid-Ohio, then won his maiden Indy Pro 2000 race at Mid-Ohio by inheriting the lead and holding off Hunter McElrea. Following two oval rounds, Robb swept a three-race weekend at Indianapolis. He held off Parker Thompson in race 2 of the second Mid-Ohio round for another victory. At New Jersey he stood on all three steps of the podium, including a win from pole in race 2. Robb secured the Indy Pro 2000 championship with two races to spare, and claimed a further victory in the final round at St. Petersburg. His season tally included seven victories, five pole positions, and eleven podiums.
Robb remained with Juncos in 2021, using his scholarship from the Indy Pro title to move up into Indy Lights. He finished eighth in the points standings, with only one top five at Mid-Ohio.
On October 28, 2021, Andretti Autosport announced that Robb would join the team full-time for the 2022 Indy Lights season. At Barber, Robb scored his first podium in the series with third. He inherited another third place in race 1 at Indy following an incident ahead, then advanced from 13th on the grid to third in race 2. He attempted to pass Benjamin Pedersen for second in the opening Detroit race but slid into the wall, finishing eleventh, before returning to the podium with third on Sunday. At Road America, Robb qualified on pole and finished second, having been overtaken by Christian Rasmussen during the lap 11 restart. A sixth at Mid-Ohio and fifth in Iowa were followed by second place on the streets of Nashville. In the Laguna Seca season finale, Robb dominated race 1 from pole, building an 11-second gap for his first and only Indy Lights win. He narrowly missed victory in race 2 to Rasmussen, finishing second in both the race and the overall points table.
Robb made his IndyCar Series testing debut in July 2022, driving the No. 98 Andretti alongside Christian Rasmussen.
With significant financial backing, Robb elected to step up to the IndyCar Series rather than remain in the renamed Indy NXT series. He was confirmed as the full-time driver for Dale Coyne Racing with Rick Ware Racing for the 2023 season, partnering David Malukas. The opening races saw Robb involved in several incidents, including a mistake at his maiden IndyCar oval race at Texas where he slid into the wall. He also caused a collision with teammate Malukas at the Indianapolis Road Course, later apologising for ending the team's day on lap two. In May, he qualified for his first Indianapolis 500, posting a speed of 229.549 mph during the "Last Chance" session to line up 32nd. Robb crashed in turn 1 near the mid-point of the race, finishing 31st. He was also disqualified from the second race at Iowa when one of the wheels dislodged itself after a pit stop. His best finish of the campaign was twelfth at Laguna Seca. Robb ended the season 23rd in the standings, with only Benjamin Pedersen among full-time drivers finishing behind him.
For 2024, Robb switched to A.J. Foyt Racing, which had just taken on a technical partnership with Team Penske. Robb was lightly injured after a last-lap crash during race 2 at Iowa: he could not avoid the slowing car of Alexander Rossi on the final lap, hitting the rear of the McLaren and somersaulting onto his own car's aeroscreen. In the next race at Toronto he retired following a multi-car crash. At Gateway, Robb claimed his maiden top 10 finish with ninth place. He concluded the season 20th in the points standings after causing two cautions in race 2 at Milwaukee.
Robb moved to Juncos Hollinger Racing in 2025, reuniting with his Indy Pro 2000 championship-winning team with Townsend Lucas as his race engineer. At the season-opening St. Petersburg race, Robb held up eventual winner Álex Palou near the end in an attempt to stay on the lead lap, finishing 21st. In race 3 at Long Beach, Robb was one of just six drivers to start on prime tyres, led for 12 laps using this alternate strategy, and finished ninth in the caution-free race. It was later reported that Robb was working with driver coach Rob Wilson to improve his performances.
Robb qualified 19th for the Indy 500 (later becoming 17th following two Team Penske penalties) but was taken out mid-race following a spin by Kyle Larson. Starting 26th at Detroit, he progressed to 15th in a chaotic race. Crashes followed at Road America (nearly hitting Marcus Armstrong under braking and hitting the turn 5 outside wall in avoidance) and at Iowa (hitting the turn 2 wall hard during race 2). Results of 17th at Toronto and 19th at Laguna Seca followed. Robb was one of two drivers to run on the hard tyres for multiple stints at Portland, finishing 14th. He concluded the 2025 season with 23rd at Milwaukee and 16th at Nashville, ending the year 25th in the points standings, third-lowest among full-time drivers.
Robb was retained by Juncos Hollinger Racing for 2026, where he joined alongside Rinus VeeKay.
Robb attended Payette High School, where he played basketball and ran cross country. He is a devout Christian and has publicly credited his faith as central to his career.
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