Questions I loved answering:

TypeScript / JavaScript

https://stackoverflow.com/questions/12694530/what-is-typescript-and-why-would-i-use-it-in-place-of-javascript/35048303#35048303

http://stackoverflow.com/questions/22426816/using-apply-new-in-javascript-to-create-objects/22428459#22428459

Domain Driven Design:

http://stackoverflow.com/questions/17933313/ddd-nested-aggregates-and-many-to-many-relationships/18291272#18291272

Regular expressions:

http://stackoverflow.com/questions/14182879/regex-to-match-latex-equations/14537848#14537848

https://stackoverflow.com/questions/15277789/currency-range-regular-expression/15281521#15281521

Scala

https://stackoverflow.com/questions/41600074/scala-and-akka-background-job/41601353#41601353

Digging in opensource:

http://stackoverflow.com/questions/19351253/boostregex-match-resultsoperator-mysterious-sub-2-line/19380532#19380532

http://stackoverflow.com/questions/20283152/puppet-package-provider-what-is-the-query-method-for/20311700#20311700

http://stackoverflow.com/questions/22132151/custom-sonarqube-admin-user-ussing-puppet/22148221#22148221

Digging into forgotten standards

http://stackoverflow.com/questions/34565189/float-to-non-standard-java-byte4-conversion/34566103#34566103

Going overboard and winning no points:

http://stackoverflow.com/questions/14363303/regex-to-match-all-excluding-block-comments/14511692#14511692

http://stackoverflow.com/questions/21056781/how-to-get-mime-type-of-p7s-files/21062794#21062794

Humor:

http://stackoverflow.com/questions/16735455/practice-class-internal-field-access-via-getters-setters-only/16757661#16757661