I am the only front end developer in my team, used to be 2, and there is 4 java backend dev. We are all Seniors, so you'd expect to be experienced. I like my code to be "nice" and I am using linting tools, rules, formatting etc... (I do JS mainly).

During a scrum review some of the java guys showed some code on the screen and that thing was a monstrosity for me! I could not look at some code like that, if I had to work with that I'd probably hang myself. Nothing was aligned, no consistency. So my question: you guys aren't using any guidelines to have cleaner code ? How do you make sure you all code the same ?

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What are you taking about ? We use Eclipse, with default options, no tools no guidelines...