After meeting Duke Dumont, he developed an interest in house music and together they co-wrote and produced “I Got U”, “Won’t Look Back” and “Ocean Drive”. Jones features on the single “I Got U”, the song peaked at number one on the UK Singles Chart in March 2014, leading to his breakthrough as an artist.

On 24 July 2015, he released the single “Yeah Yeah Yeah”. In July 2016, he released the single “House Work”. Jax says of the track, “At the end of the day, I started making beats on a four-track, so it feels right to put that DIY energy into my music”. In December 2016, he released the single “You Don’t Know Me” based on the sampling of the bassline of M.A.N.D.Y. vs. Booka Shade’s 2005 hit “Body Language”. The song became his biggest success, reaching number three in the UK and top five status in several European countries, including Germany, Ireland, Belgium and Norway. Jones continued to release songs wherein he collaborated with the likes of Demi Lovato and Years & Years. He released his debut extended play, Snacks, on the 28th of November 2018. The EP was later expanded into Jones’ first album, Snacks (Supersize), which was released on the 6th of September 2019.

Jax also collaborated with fellow DJ Martin Solveig to create the musical duo Europa. Their first song together, “All Day and Night” (featuring Madison Beer, was included Jones’ 2018 EP Snacks and was released as single in March 2019. They released their next single, “Tequila” (featuring RAYE), in February 2020.

On 18 September 2020, Jax announced on his Instagram that his wife had given birth to their daughter, Lawana.