One phone screen.

One technical phone interview, coding on Google Docs:

• How would you write DB write/access functions to ensure data is not modified by threads?
• Parse a mathematical expression given as chars in an array: ['1', '+', '2', '/', '4'].

Four onsite interviews over the course of 4 hours, asking a variety of questions:

• Write an algorithm to find a loop in a graph.
• Write C code to convert an integer to a string.

Write an algorithm to find a loop in a graph. The graph is unidirectional with any number of connections. The graph is not necessarily connected.