Langasque turned professional after the
2016 Masters Tournament, thus forfeiting his exemption into the
2016 U.S. Open. Langasque played on the
Challenge Tour in 2016, where he was runner-up in the
Barclays Kenya Open, the
D+D Real Slovakia Challenge and the
Vierumäki Finnish Challenge. He finished ninth in the Road to Oman, the order of merit, to gain entry to the
European Tour for 2017. Langasque started the
2017 European Tour season by finishing tied for tenth place in the
Australian PGA Championship. This was his only top-10 finish of the season and he finished 151st in the Race to Dubai, losing his
European Tour place. In December 2017 he finished tied third at the
AfrAsia Bank Mauritius Open, where he had been invited. He then missed the cut in 5 of the 6 other European Tour events he was able to play, the last of them being the
HNA Open de France in July 2018. Back on the
2018 Challenge Tour, he had a difficult start, earning less than €6,000 until mid-July. From the
Le Vaudreuil Golf Challenge he started playing more solidly, making eight cuts in a row, including a tied fifth place at the
Kazakhstan Open in September and his first professional victory a week later at the
Hopps Open de Provence. Despite a fourth-place finish in the
Ras Al Khaimah Challenge Tour Grand Final, he finished 19th in the Road to Ras Al Khaimah rankings, missing out on a European Tour place. However, less than two weeks later he finished in fifth place in the European Tour
Q-School to earn a place on the
European Tour for 2019. Langasque had a successful start to the
2019 European Tour season, finishing second in the
South African Open in December 2018. The event was part of the Open Qualifying Series and his high finish gave him an entry to the
2019 Open Championship, his first major as a professional. He had solo third-place finishes in the
Made in Denmark tournament and the
Scottish Open and finished the 2019 season 24th in the Order of Merit. On 23 August 2020, Langasque won the
ISPS Handa Wales Open by two shots over
Sami Välimäki. He shot a final round 65 to overturn a five-shot deficit for his first European Tour win and advanced to 100th on the Official World Golf Ranking, tying his career best ranking from July 2019. On 29 September
2022, in the first round of the
Alfred Dunhill Links Championship, Langasque tied the course record at the
Old Course in St Andrews,
Scotland, with score of 11-under-par 61. ==Amateur wins==