The head of the Emergency Department of the European Research Hospital Georges Pompidou, Juvin held the mayorship of La Garenne-Colombes, a Parisian suburb, from 2001 to 2022 and was briefly a member of the Regional Council of Île-de-France in 2021–2022.

Juvin is currently Head of the Emergency Department of the European Research Hospital Georges Pompidou in Paris,[2] where he was appointed after a selection procedure that started in March 2010.

[1] He positively answered to the solicitation of "Ukrainian colleagues", whose "courage" he saluted, to help the medical staff and teach war medicine to soldiers, doctors and civilians.

Since his election, he launched 4 twinning programmes for the city of La Garenne-Colombes with Valpaços (Portugal) in 2004, Yoqneam (Israel) in 2006, Clarksville (United States) in 2008 and Daroun-Harissa (Lebanon) in 2011.

He was furthermore rapporteur for the European Parliament on the Impact of Advertising on Consumer Behaviour, and on electromagnetic fields, and worked as rapporteur for the EPP on a variety of files: the reinforcement of the rights of vulnerable consumers, the reduction of health inequalities within the EU, the establishment of a collective redress system at EU level, data protection, the reinforcement of the food supply chain in Europe and pharmacovigilance.

[15] After Michel Barnier's nomination as European Commissioner for Internal Market, Juvin ran to chair the UMP group of the PPE presidency.

[17] In response to France's anti-terrorism legislation allowing mass surveillance of suspected terrorists following the January 2015 Île-de-France attacks, Juvin and Thierry Solère sent a joint letter to President of the European Commission Jean-Claude Juncker warning that, without proper safeguards, the new intelligence measures would violate the Charter of Fundamental Rights of the European Union.

In 2018, Wauquiez included Juvin in his shadow cabinet; in this capacity, he served as opposition counterpart to Minister of the Armed Forces Florence Parly.

[24] During his campaign, Juvin defended the reduction of social security contributions, advocated the postponement of the retirement age to 65 and the extension of the legal working week.

Unlike his opponents within the party, he did not make immigration and security issues central to his platform, seeking to introduce the theme of public services into the political debate on the right.

[27] Ahead of the Republicans' 2022 convention, Juvin endorsed Bruno Retailleau for the party chairmanship;[28] however, Éric Ciotti won the second-round vote.