[1] He is regarded as a pioneer of the future house genre, propelling it to international attention and scoring numerous chart successes, including "Gecko (Overdrive)", "Last All Night (Koala)", "The Right Song", "Fire in My Soul", and "Turn Me On".

Heldens' 2013 song "Gecko" caught the attention of fellow Dutch DJ Tiësto, who signed the song to his label,[5] Musical Freedom, and later released a vocal version through Warner Music Group's FFRR with British singer Becky Hill on 23 June 2014 as "Gecko (Overdrive)".

[6][7] The song peaked at number 1 on the UK Top 40 chart in June 2014, was named "Essential New Tune" by BBC's Pete Tong on 31 January 2014, and DJs including David Guetta, Martin Garrix, and Zedd began supporting it.

[7] In January 2014, Heldens launched his Heldeep Mixtape on his official SoundCloud page, creating extended mixes which incorporate various genres of electronic music including different types of deep house and tech-house.

In a Billboard interview at Tomorrowland, Heldens described his style as deep house while also acknowledging the mainstream influences in his music.

[10] In July 2015, the HI-LO song "Renegade Mastah" was the first track to be released on Heldens' new label Heldeep Records.

[11] Heldeep would grow from a small imprint to a fully-fledged label, signing artists including Alok, Chocolate Puma, and Dada Life.

[12] Heldeep Talent EP was released on 23 November 2015 and included the songs "I Can't Stop" by Death Ray Shake, "Hookah" by Bojac, "Slip Away" by Niko The Kid, and "Fall Under Skies" by Jonas Aden & Robby East.

Since then Oliver released "Heldeep Talent EP Part 2" on 21 March 2016 Featuring three tracks: "Get Busy" by Steff Da Campo, "Lethal" by NOVKA, and "Mirrors feat.

[24] As a remixer, Heldens has released remixes for many high-profile artists, including Calvin Harris and Dua Lipa's "One Kiss",[25] David Guetta and Anne-Marie's "Don't Leave Me Alone",[26] The Chainsmokers' "All We Know",[27] Katy Perry's "Chained to the Rhythm",[28] Calvin Harris and Ellie Goulding's "Outside",[29] Charlie Puth's "Attention", and Jamiroquai's "Superfresh".

Others are "Rave Machine" with Rowetta, "Break This Habit", "Freedom For My People" with Shungudzo and the single "Set Me Free" together with MAX and Party Pupils.

These two songs are solely produced by HI-LO and are the start of an association with Adam Beyer and his techno record label.

Tom Grennan)" by Calvin Harris, and OH2 Records saw its second big release by Heldens with the song "Deja Vu", which features the vocals of Anabel Englund.

[33][34][35][36] Heldens has performed at festivals and venues including Coachella, Glastonbury, Lollapalooza, Electric Daisy Carnival, Ultra, Tomorrowland, Amsterdam Dance Event, Electric Zoo, Creamfields, Veld Music Festival, Stereosonic, Djakarta Warehouse Project, Sensation, Brooklyn Mirage, Echostage, Fabric, Governors Island, LIV, Printworks, and Red Rocks.

[1][4][37] He has held residencies at clubs in Las Vegas and Ibiza including Hakkasan, Omnia, Wet Republic, Marquee, HÏ, Ushuaïa and Pacha.