Web Developer / Blog

December
4th, 2008

Interview questions from Google, Yahoo!, O’Reilly and a few startups

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Just over a year ago my wife and I decided that we’d consider moving from Cincinnati to Silicon Valley.  I’ve always found it difficult to find work that I enjoyed in Cincinnati.  That resulted in me being involved in two startups, neither being successful :).  As part of the process my friends who were also considering moving and I documented the questions we were asked during interviews.

O’Reilly (in person):

  • Create a Perl dictionary in Python.

Google (phone):

  • What is a sticky bit?
  • How do you display all available information for an inode?
  • What is the default switch for kill?

Gaia Online (in person):

  • Write pseudocode which determines if a move is legal in reversi.
  • Write a regular expression to convert this UBB code into valid HTML: The dog [b]ran over [i]the street[/b] and said: [blockquote]i am a dog[/blockquote].
  • Questions regarding what I did to help scale software at Photagious and ClearChannel.

Rearden Commerce (in person):

  • What is the architecture where you currently work and what are some of the bottlenecks?
  • How do you go about solving a performance problem?
  • Can a computer process two things at the same time?
  • How would you implement support for multiple languages in a web application?
  • How would you remove all of the sequential characters from the following string: AADBDDDABDDEAAD?
  • How would you speed up the performance of Javascript?
  • How would you speed up the performance of CSS?

Yahoo! (in person):
Group 1

  • What does the gnu top program do?
  • What does the gnu find program do?
  • What is the difference between a thread and a process?
  • What version control software have you used?
  • Why would you use git over subversion?
  • What is a hash datatype?
  • What is a super class or parent class?
  • Explain prototype in Javascript.
  • What character encoding does Javascript use?
  • What methods are supported by HTTP?
  • When wouldn’t you use an MD5 hash?
  • How would you approach writing an similar hashing algorithm to MD5?
  • What is a CSS sprite?

Group 2

  • Given a 2 dimensional array write pseudocode which sorts the array by the 2nd dimension.
  • How would you replicate the PHP extract function?

Group 3

  • How would you efficiently pull out links to MP from an HTML file?
  • Can you avoid cross site scripting (XSS) with ajax calls?  If so, how?

Group 4

  • Given n points in the form (x1, y1, z1)…..(xn, yn, zn), find the k closest points to the origin.
  • Given the same points as above, find the K closest points to each other.
  • Given a url such as http://yahoo.com/foo/bar/../baz/./abc/foo/def/../ghi, determine the final directory being requested by parsing the string.
  • Given the following set of numbers: 10, 7, 5, 8 find all pairs which add up to 15.

Once it was all said and done, we all ended up out here in sunny California.

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About this site:
This is my (Jaisen Mathai) personal site for potential employers who want to see my resume or portfolio. My ideal job would be to work as a Web developer on a large scale consumer website. My experience is in using PHP, MySQL, Ajax and JSON. I really enjoy creative brainstorming...taking a problem apart and narrowing 100 solutions down to the best one.

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