作者对自己维护的 perl 的 CGI module 有感而发，颇有哲理。我们现在写的每一行新代码最终都将成为 legacy；正如所有软件都有 bug，所有软件都是 legacy。
『The important thing is that we learn from that and we make sure the future legacy is easy to understand. Write clean interfaces, good tests, descriptive commit messages. Another important thing is to understand the lineage; In CGI.pm’s case the module was in part responsible for Perl’s huge popularity early on, and even propelled Perl forwards. When the limitations of CGI.pm’s implementation were hit alternative code was written in response, again and again, leading to where we are today.』
几年前很多网站的 url 里经常看到 /cgi-bin/ 的字样，那十有八九是用 perl 的 CGI.pm 搭的网站：）
由于 Stack Overflow 里 2/3 的工程师都是远程办公，所以面试主要也是远程的，用 Google Hangouts + 共享文档写代码，注重交流的过程而非quiz。做招聘决定时，只有 yes 与 no，maybe 等于 no。
对于公司来讲，面试真的很难。连这么有经验的Google都觉得难。文中引用了Google管人事的 VP 的话："We looked at tens of thousands of interviews, and everyone who had done the interviews and what they scored the candidate, and how that person ultimately performed in their job. We found zero relationship. It’s a complete random mess..."