Oldest surviving code dates back to 2006. It's a simple PHP script, that generates an Excel file(without the help of any libraries. I was really into not-invented-here then) containing information about banners shown for a week. If it works, don't touch it, right?
Second one dates back to 2008. It's a webapp written in Django for real estate agents. Full of bugs, requiring careful input of data in order not to mess up the listing. I went on a 3 day hackaton somewhere back in 2011 to fix all the bugs for free and got some very angry calls, because things weren't working like they used to before. Turns out people were aware of these bugs and made their own workarounds. I was forced to roll back all my changes and backport just a single change - the ability to reorder images by using drag and drop.
Second one dates back to 2008. It's a webapp written in Django for real estate agents. Full of bugs, requiring careful input of data in order not to mess up the listing. I went on a 3 day hackaton somewhere back in 2011 to fix all the bugs for free and got some very angry calls, because things weren't working like they used to before. Turns out people were aware of these bugs and made their own workarounds. I was forced to roll back all my changes and backport just a single change - the ability to reorder images by using drag and drop.