Web Design, Web Development Guest Blogger

Looking for an expert on web design and web development content that will help us guest blog on other web design/development websites. Applicant should have a proven track record and provide 3 links to works that they're proud of.
Guest blog sites should have an adequate amount of traffic and social proof (blog comments, social shares, RSS readers, social followers, etc.).

Please also list 3 sites that you can write on and your Twitter handle. We're looking for 500+ word articles that are actionable and valuable to readers.