I live in Kirkland, moved here from Queen Anne 10 years ago. Traffic is pretty horrible, as others have said, even within Kirkland proper. My husband commutes by bus the other way, into Seattle, and it is grueling. We do have 2 VERY nice grocery stores walking distance to Google, one is an organic co-op, the other a fancy-pants gourmet market. ETA saw you will be working in Totem Lake. Much more affordable than Houghton (Google neighborhood) or DT Kirkland! Totem Lake does have a great Trader Joe's, as others have mentioned.
Kirkland is a great place for families, which is why we moved here from Seattle, but I also see lots of younger/single people here in the past few years. Nowhere near as hip as Belltown or Capitol Hill, of course, but honestly, the hipness factor in those neighborhoods would exhaust me. It's a beautiful spot with unlimited biking, paddle boarding (on the lake), running trails, parks, some pretty decent restaurants, and a small town feel. Oh, and a great library system (King County), one of the best in the country. Also easier access to the mountains if that's something that interests you. Juanita and DT Kirkland, Redmond and Bellevue have good farmers' markets May-October, too. Pike Place Market is fun but really for tourists!