Huttunen retired from go-kart competition at age 19 in 2013 and committed fully to rallying, joining the AKK Driver Academy in Finland. He began in local events with a Suzuki Swift before switching to an Opel Kadett, taking a class win at the Oulujärvi Rally while placing fifth overall. In 2014 he moved to an Opel Astra, recording a fourth-place finish at the Pohjola Rally and securing enough backing to debut in the Finnish Rally Championship with a Citroën C2 R2 at the season's final two rounds, claiming a junior class podium at the closing event.
The 2015 season was decisive for Huttunen. Signed by Printsport as a full-time driver in the Finnish championship's R2 junior class, he took two class wins and secured the SM3 Class title, earning the "Rally Star of the Future" designation from the Finnish championship organisers. He also made his World Rally Championship debut at Rally Finland, competing in WRC-3, though a crash in the second leg forced his retirement.
Huttunen entered the Deutsche Rallye Meisterschaft full-time in 2016, competing in the spec Opel Adam category. He won all but one round of the championship, claiming the Opel Rallye Cup title with near-total dominance. This result earned him a place in Opel's Junior Rally Team for the following season in the European Rally Championship.
Driving for the Opel Junior Team in the ERC-3 category, Huttunen competed alongside British driver Chris Ingram in 2017. Although Ingram often had the upper hand in ERC, Huttunen's mid-season return to the WRC produced one of the most unexpected results of the year. Racing for Printsport in a Skoda Fabia R5 at Rally Finland, only his second ever WRC event and only his second time driving four-wheel-drive machinery in competition, Huttunen won the WRC-2 class by two minutes and 17.8 seconds over Quentin Gilbert.
The result attracted significant attention and led Hyundai Motorsport to include Huttunen in a multi-driver shootout at the end of 2017, competing against talents including Kalle Rovanperä, Gus Greensmith, and Pierre-Louis Loubet. Huttunen was selected for Hyundai's 2018 R5 development program, making his first appearance for the team at Rally Great Britain.
Competing for Hyundai Motorsport in selected WRC-2 events through 2018, Huttunen faced a mixed season. Early outings in Sweden and Mexico were hampered by mechanical failures and less competitive machinery relative to the Skoda and Toyota packages. He nonetheless showed strong pace at his home Rally Finland, finishing second in the WRC-2 class, and recorded a near-win at Rally Poland in the European Rally Championship, finishing second after a 10-second time penalty in the closing stages.
He concluded the season at Wales Rally GB, where a fourth-place WRC-2 finish gave him eighth in the overall WRC-2 standings.
With Hyundai reducing its junior program focus in 2019, Huttunen returned to Printsport for Rally Sweden on a one-rally deal, again in a Skoda. He was running in second in the WRC-2 class and won seven stages including one outright over the main WRC field — an exceptional feat in R5 machinery — but crashed out with two stages remaining when he had been closing on the class lead.
The 2020 season was Huttunen's most successful. Co-driven by Mikko Lukka in a Hyundai i20 R5, he competed in four WRC-3 rounds: winning at Rally Sweden and Rally Italia Sardegna, finishing second at Rally Estonia, and third at ACI Rally Monza. His 83 points were enough to claim the WRC-3 championship by five points over Marco Bulacia Wilkinson. He also earned 14th place in the overall WRC standings.
Simultaneously, Huttunen won the Polish Rally Championship, which ran just three rounds due to the COVID-19 pandemic. He won two of the three events — the Rajd Rzeszowski and the Rajd Śląska — and finished second in the third to claim the title ahead of Grzegorz Grzyb.
He also participated in testing for the new Hyundai i20 Rally2 car ahead of its competitive introduction.
Huttunen's career arc — from local Finnish events through a dominant German title and then an improbable WRC-2 debut win — marks him as one of the more dramatic emerging rally talents of the late 2010s. His 2020 WRC-3 title and Polish championship confirmed his ability to convert speed into consistent championship results. His management by Marcus Grönholm further connects him to Finland's deep rally tradition.