I only have 3 favorite producers: Richard X Xenomania SAW Edit: Oh, you meant the 2010s decade? I've got nothing.
Max Martin almost has too many to decide from. It's probably either I Want It That Way, Since U Been Gone, or Baby One More Time.
If only there was a rate that could decide the forum consensus! (I can't believe five producers were named before Max Martin came up, what're y'all doing?!?!)