We dont have to always learn the hard way. We can learn from others experiences. Here are some links of great engineering blogs from solid technology companies where you get to see how they use technology FOR GOOD. Hope this helps!!
http://engineering.linkedin.com/
http://engineering.twitter.com/
http://engineering.tumblr.com/
http://nerds.airbnb.com/
https://www.facebook.com/Engineering
http://google-engtools.blogspot.in/
http://googledevelopers.blogspot.in/
http://googletesting.blogspot.in/
https://engineering.groupon.com/
http://developer.bazaarvoice.com/blog
http://techblog.netflix.com/
http://instagram-engineering.tumblr.com/
http://codeascraft.etsy.com/
http://engineering.foursquare.com/
http://word.bitly.com/
https://tech.dropbox.com/
http://code.flickr.net/
http://37signals.com/svn/sysadmin
http://devblog.xing.com/
http://www.twilio.com/engineering
http://blog.socialcast.com/engineering/
http://corp.klout.com/blog/category/engineering/
http://eng.yammer.com/blog/
http://engineering.slideshare.net/
Please feel free to add, if you find something great missing here.