The WTTJ profile is your prep material, read it end-to-end first
Every French scale-up on Welcome, Alma, Partoo, BlaBlaCar, Doctolib, Aircall, invests heavily in their WTTJ employer profile. Videos with founders and engineers, employee bios with personal interest sections, blog posts on culture and process. Block 20–30 minutes before applying: watch the founder video, read 2–3 employee stories, scan a recent article. Take notes of specific names, quotes, or projects mentioned. This is exactly what the recruiter will expect you to reference in your application, and it's what separates the candidates they remember from the ones they don't.