- Tiffany Amber – composer
- Ammo – instrumentation, producer, programming, background vocals
- Beatriz Artola – engineer
- Stacey Barnett – background vocals
- Billboard – instrumentation, producer, programming
- Benny Blanco – instrumentation, producer, programming, background vocals
- Sophia Black – background vocals
- Christian Karlsson – instrumentation, producer, programming, vocal producer
- Heather Bright – composer, background vocals
- Jeremy Coleman – composer
- Joshua Coleman – composer
- Tom Coyne – mastering
- Ester Dean – composer, background vocals
- Megan Dennis – production coordination
- DJ Ammo – drum programming, synthesizer
- Dr. Luke – executive producer, instrumentation, producer, programming, background vocals
- Dream Machine – instrumentation, producer, programming
- Dylan Dresdow – mixing
- Eric Eylands – assistant engineer
- Ashton Foster – background vocals
- Livvi Franc – composer, background vocals
- Fraser T Smith – composer, drum programming, keyboards, producer
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- Clint Gibbs – production coordination
- Aniela Gottwald – assistant
- Tatiana Gottwald – assistant
- Venza Gottwald – assistant
- John Hanes – engineer, mixing
- Jeri Heiden – art direction
- Jacob Kasher Hindlin – composer
- Sam Holland – engineer, background vocals
- J-MIKE – instrumentation, producer, programming, background vocals
- Cri$tyle Johnson – background vocals
- Mathieu Jomphe – composer
- Henrik Jonback – composer, instrumentation, producer, programming, vocal producer
- Claude Kelly – composer, background vocals
- Padraic Kerin – engineer
- Savan Kotecha – composer
- Alexander Kronlund – composer, instrumentation, programming
- Adam Leber – A&R
- Benjamin Levin – composer
- Jeremy "J Boogs" Levin – assistant
- Magnus Lidehäll – composer
- Magnus – instrumentation, producer, programming, vocal producer
- Myah Marie – background vocals
- Max Martin – composer, engineer, executive producer, instrumentation, keyboards, producer, programming, background vocals
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- Bonnie McKee – composer, background vocals
- Nicole Morier – composer, background vocals
- Jackie Murphy – creative director
- Rob Murray – assistant
- Chris "Tek" O'Ryan – engineer
- Chau Phan – background vocals
- Irene Richter – production coordination
- Tim Roberts – assistant engineer, mixing assistant
- Patrizia Rogosch – background vocals
- Larry Rudolph – A&R
- Kesha Sebert – composer
- Britney Spears - lead vocals, composer, background vocals
- Shellback – engineer, guitar, keyboards, producer
- Shellback – bass, composer, engineer, guitar, keyboards, producer
- Nick Steinhardt – art direction, design
- Sophie Stern – composer
- Ryan Supple – photo production
- Peter Thea – A&R
- Dave Thomas – stylist
- Henry Walter – composer
- will.i.am – composer, drum programming, engineer, piano, producer, synthesizer
- Pontus Winnberg – composer
- Emily Wright – composer, engineer, vocal producer
- Randee St. Nicholas - photography
- Serban Ghenea – mixing
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