If the analogy is between a software shop and a band then I wouldn't say DBA's are on stage. The sales reps and support are the performers, the developers are the songwriters (and often performers too). DBA's would be behind-the-scenes people: sound or lighting engineers or even roadies.

So if you were hiring a sound engineer: They need to be demonstrably proficient, experienced and reliable. If they need to be performers or songwriters too then that's a strange set up and they will need qualities that might be diametrically opposed to those. Drummers and bassists also need to be especially reliable and not inclined to show off. I don't think you want a singer or lead guitarist doing the sound levels or lighting: their egos would get in the way.

Sound engineers (DBAs) need to be able to lay down the law to the band (managers, sales and development) at times but still working with them to achieve the desired effect ("if we turn the guitars up any more it'll drown out the vocals and we'll start getting feedback. maybe we could layer the direct guitars with an aux send to get a bigger sound without making it louder"). I expect all the great bands had great sound engineers.