Security Engineering Teams / Positions @ Google

Can someone from Google give me a rundown of the various Security Engineering positions at Google? Looking at open positions, I see titles like Information Security Engineer, Security Engineer (Threat Analysis), Security Engineer (Detection), and Security Engineer (Infrastructure Protection). I get the general jist of each position from the job postings, but looking for some inside insight in to the best security teams / positions. Which positions are SWE with a security focus vs. dedicated Security positions? Also any info about location of these teams would be awesome.