I too would recommend a Ralph Moore rose. Sequoia Gold is a fantastic rose. It is starting to rebloom (3x this year so far). In my 24 years with this rose (can't believe that bush is 24 years old!), I have rarely seen it without a bloom (unless I have cut them all off and am giving the plant a rest). BTW, that yellow color does not fade in the sun/heat--amazing!
I also have his Halo Sweetie and it is another fantastic rose. However, it is not a bright color, so I don't know if you would be interested (if you can even find this rose now-a-days). One of the mentors in my Master Gardener class used to have every one of Ralph's Halo roses. Unfortunately, she moved and left her over 400 roses behind. She just couldn't take care of them any more (advancing age). Every time I would mention mine, her eyes would light up and she would talk about them.
If you want a rose that does well in a pot and has pretty much continuous bloom and can take the heat, I would recommend Peppermint Parfait. It is not bright colors but does have some striping (pink, cream) and it is incredibly healthy. I could not believe all the blooms on it yesterday, when I would outside deadheading and also providing an all you can eat, free, personal buffet for passing mosquitoes.
Another rose I would suggest would be Kim Rupert's Little Butterfly. I think the colors would brighten up any corner. Although I don't have particular experience with this rose....yet (I am getting it next year), I know from personal experience that any of my Kim Rupert roses have been disease free, beautiful blooms, withstand the heat in my inferno yard, etc. This rose is just simply charming and reminds me of a KR NOID (my name for one of his seedlings 'Kim Rupert No ID' rose), which looks very similar--except mine has more pink tones to it. Hey, if I am willing to sacrifice the first bloom the those ugly Hoplia Beetles, it has to be a great KR rose! Burling carries it.