In 2015, Allen was featured in
Teen Vogue, after releasing two solo EPs. She began her career by working on a number of solo projects and formed Amy & The Engine, a four-piece
indie pop rock group, before moving to
New York City for a year. The band released their first single "Last Forever" on February 14, 2015.
TandeMania, their debut EP, was released on September 22, 2016. Amy & The Engine announced their EP
Get Me Outta Here! in 2017 and an East Coast tour in the summer of 2017 and a U.S. tour in 2018. Allen described the sound of Get Me Outta Here! as being "a bit darker and heavier than the first". Amy & The Engine released the EP's lead single "Chasing Jenny" in January 2017. Going to
Los Angeles in November 2017, she began collaborating with
Scott Harris and eventually signed to
Artist Publishing Group. In 2019, Allen signed to
Warner Records, and it was expected that her debut solo album would be released in 2020. Also in 2019, she collaborated with
Harry Styles on his single "
Adore You", and collaborated with Halsey again on the single "
Graveyard". Allen also collaborated with
alternative rock band
Pvris on their 2019 EP,
Hallucinations. She was named as one of
Varietys "2019 Hitmakers" for the single "Without Me". In January 2020, Allen was featured in
Forbes 30 Under 30 in Music. She has been announced as a panelist for the 2020
ASCAP Experience. On January 22, 2020, it was announced that Allen would be performing at the annual St. Jude Songwriters Showcase to benefit the
St. Jude Children's Research Hospital, along with
Gretchen Peters. On March 9, 2020, the ASCAP Experience event was cancelled due to concerns over the ongoing
COVID-19 pandemic.
Variety named Allen a "2020 Hitmaker" for co-writing Harry Styles' "Adore You". After signing a recording deal with
Warner Records, Allen released five singles over the next two years: "Queen of Silver Linings", "Difficult", "Heaven", "What a Time to Be Alive", and "One". Her debut solo EP,
AWW!, was released on November 5, 2021 with singles "A Woman's World" and "End of a Dark Age" having been released in the preceding two months. In 2024, Allen released new singles "Girl with a Problem," "Darkside," "Even Forever," and "To Love Me" from her debut album,
Amy Allen, released September 6, 2024. In advance of her album release, she opened for
Bleachers on their 2024 European tour. Allen’s successes with
Tate McRae ("
Greedy") and
Sabrina Carpenter ("
Feather," "
Espresso," and "
Please Please Please") topped the Top 40 Radio charts and "Please Please Please" went to No. 1 on the Billboard Hot 100. Allen co-wrote every track on Carpenter’s ''
Short n' Sweet'' album which debuted at number 1 on the Billboard 200. In September 2024,
The New York Times published a profile of Allen’s success including quotes from collaborators including
Jack Antonoff and
Julia Michaels. In the same week, Allen claimed the number one spot on the Billboard Hot 100 Songwriters chart, with thirteen songwriting credits on the Billboard Hot 100 (including all twelve tracks from Sabrina Carpenter's number one album ''Short n' Sweet''). With the achievement, Allen became the sixth woman to reach number one on the Hot 100 Songwriters chart in the year 2024. As of September 2024, she has co-written 34 Hot 100 charting songs, seven of which were top 10 chart hits. Six of her songs have also hit number one on the Pop Airplay chart. She is only the third woman in the history of the Hot 100 Songwriters chart to capture number one without also being billed as the recording artist. During the 2024 awards season, Allen won the Variety Hitmakers Songwriter of the Year Award. She has been nominated for the Top Hot 100 Songwriter category in the 2024 Billboard Music Awards. In 2025, she received the Grammy Award for Songwriter of the Year, Non-Classical. She also received the Songwriter of the Year award at the iHeartRadio Music Awards in 2025. During the 67th Annual Grammy Music Awards, Allen was nominated in four categories: Songwriter of the Year, Non-Classical, Best Song Written for Visual Media ("Better Place" from Trolls Band Together), and for both the Album of the Year (Short n' Sweet), and Song of the Year ("Please Please Please") awards for her work with Sabrina Carpenter. Allen was awarded the Grammy for Songwriter of the Year, Non-Classical. She is one of only two songwriters in history to have been nominated twice in the Songwriter of the Year category at the Grammy Awards, and is the first woman to receive the award. == Style and influences ==