[2] Metivier credited Philip Pullman's His Dark Materials trilogy for inspiring her to write.
[3] Metivier began her career in children's television, working as a script editor and development executive at Kindle Entertainment.
She began a running collaboration with Dan Berlinka in 2014, co-creating and writing the children's mystery series Dixi for CBBC Online.
[8] She continued script editing on The Life and Adventures of Nick Nickleby and the eleventh series of Doctor Who.
She would later write the fourth episode of the twelfth series, Nikola Tesla's Night of Terror.