Go to Sephora and have one of their staff to try Makeup Forever's Mat Velvet to your skin tone. It's a light foundation that isn't shiny and doesnt need powder. If it's well matched to your skin, you can use it only where you need to even out your skin, like around your nose, chin and forehead.

Also, consider trying a kittle cream blush, to add a bit of color. Cream is mire blendable than powder, and it's easy to wipe away if you go too heavy. Stila has some nice ones.

I hardly ever wear foundation, but when I do I use mineral powder foundation. I use one by Aubrey Organics that I got at PCC, and haven't had any issues with it irritating my skin.

I have sensitive skin that is mostly oily but dry in some places, and any heavy foundation just highlights the dry in a very unattractive way. So I make sure my skin is clean and well moisturized first. I put the mineral makeup on with a big puffy powder brush and when I'm done with whatever other powdery makeup I might use I mist my face with a little bottle of water (sometimes rosewater if I have it). The mist helps the foundation disappear on my skin and not look too powdery. After the mist dries I put on mascara and my tinted lip balm. Blotting papers are nice for touch-ups - you don't have to worry about spilling powder on yourself.

I've also heard really good things about Clinique from people with sensitive skin.

Oh, make sure you drink plenty of water and other hydrating fluids - it really helps the way your skin looks.

I have super-sensitive skin and I've had good luck with Clinique superbalanced makeup. It is a liquid makeup. I don't use much and then use a little bit of powder. I've heard good things about mineral powders, but have never tried them myself.

You might want to decide on something fast, and try it out to make sure it doesn't give you a rash or something first. You can usually put some on your inner arm to try it out, or maybe start out with a bit on your face.

Good luck! And try not to put on too much makeup. Better less than more!

I have sensitive skin and breakout if my makeup is too heavy and I LOVE Neutrogena Healthy Skin Enhancers for foundation. http://www.neutrogena.com/product/healthy+skin+enhancer.do NOT the other versions of their Healthy Skin foundation - they're all way too heavy for me. I even cut this with a bit of lotion before I apply, depending on the level of my skin coverage needs. You can find it at most drugstores. It's light enough that my skin can breathe but makes my skin even and nicely moisturized.

I also reccomemd the mineral make up. As a foundation newb the chances of putting too much on, or having it patchy when using liquid is very high. With the mineral powder you have much more control over how much you put on.

Tips:
1 - get the nice big brush, is a must for good application
2 - Get some put on you in the shop. If the sales person is condescending or disinterested, go elsewhere. Once you have it on your face, go outside and look at it. If you look like you, then it is an ok color.. Do not feel obligated to buy just because the salesperson put it on you. If it is too light or dark, keep shopping.
Get the salesperson to show you how to put it on. The trick is the circling motion, but it is easiest to learn by someone demonstrating.

Find a foundation for sensitive skin. If you are new to wearing cover up/foundation don't try to cover every splotch because the results will be noticeable. Instead, opt for a light coverage foundation and smooth a small amount only over the splotchiest areas of your face. Don't wear a full face, it can look caked on.
Make sure you moisturize before the application. Apply foundation in natural day light if possible to prevent further unevenness.
Finish with a light dusting of powder using a makeup brush. I use plain old cornstarch as powder which works like a charm and shouldn't affect sensitive skin.
If you get oily throughout the day, blot the areas with a tissue.
If you intend to purchase a foundation anyway, it might be good to visit a quality makeup counter before the interview. Pick out a foundation you want to purchase and have a professional apply it for you. Do the rest of the makeup yourself (you want to look like YOU at the interview after all).
Makeup counter foundation can be expensive (think MAC, NARS, Lancome, ect) but it utilizes better quality ingredients that will be milder on your sensitive skin.

Well, I don't think the makeup will cause greasiness in itself, though if you're sensitive, the wrong foundation may cause breakouts. But what you want to keep in mind is that liquid makeup along with already greasy skin may seem greasier after a few hours, slipping off your face (even with a mattefying powder on top.) Personally, I have greasy skin but stick to the liquid foundations anyway, because I also have uneven colors, small breakouts and scars, which liquid makeup hides better (I usually use a primer to help dealing with the grease, esp. in summer.)
If you don't feel like you need tons of coverage, go with a mineral powder foundation, they're usually kinder to the skin, and will help with the grease (getting a good brush for powder makeup is key). You can also buy blotting papers in most makeup stores, they suck up the excess grease without messing to much with the rest of your makeup.