Teads Senior Full Stack Developer interview questions

Even though they are hiring for Full Stack Developers who has knowledge on Java, role is actually in Scala (they mentioned that for Java developers it would be easy to learn & work in Scala) and React JS. Initial exchange with HR: Regarding roles, responsibilties, salary expectations and all Technical round with a Manager: This is 360 degree round (Screening on everything. It includes: a coding exercise, working strategies, previous project experiences, tools/technologies used) Next 4 rounds in Paris office(System Design, Code Review, Cultural fit with VP or Director & final debrief with HR) - 1 hr each round They have arranged for lunch in a restaurant nearby their office Even though i felt i did well but then after attending all rounds HR called me and said there was a negative feedback in one of the 4 rounds :-(