He scored his first Hungarian League goal in the 2013–14 Nemzeti Bajnokság I season against Mezőkövesd-Zsóry SE in the 28th minute at ETO Park.

On 17 January 2025, Lang was signed by Hungarian League club Debreceni VSC on a two and half-year deal.

[19] He went on to play the full 90 minutes against both Iceland and Portugal, as Hungary qualified for the knockout stage as Group F winners, unbeaten in three matches.

[22] On 13 November 2016, Lang scored his first goal for Hungary in a 4–0 win over Andorra during 2018 FIFA World Cup qualification.

[23] On 1 June 2021, Lang was included in the final 26-man squad to represent Hungary at the rescheduled UEFA Euro 2020 tournament.

[24] He was an unused substitute in all three of the team's Group F matches, as the Magyars lost to Portugal and drew with both France and Germany.

[27][28] On 16 June, he started the team's opening match of the tournament against Switzerland, playing the first 45 minutes of the 3–1 loss before being substituted for Bendegúz Bolla at half time.