I applied online. The process took 2 weeks. I interviewed at WTW (Philadelphia, PA) in Sep 2008
Interview
I was interviewed back in 2008, when Towers Perrin hasn't been merged with Watson Wyatt. The interview started from a phone interview with their HR, and then about an hour phone interview with a technical manager. After a week, I was invited to on-site interview. There were 4 people interviewed me in different aspects, e.g., database, problem solving, design pattern, and etc. I got the offer in the second day and I took it.
Interview questions [1]
Question 1
describe the concept of design patterns, how to use it, and when to use it.
I applied through a recruiter. The process took 2 weeks. I interviewed at WTW (Guildford, England) in Nov 2019
Interview
I was given a Programming problem and expected to submit its solution later in stap 2 had 1:1 discustion with team leads in their office. They hadn't checked my solution before the interview. Even then they are interested in throwing all sorts of programming questions on you. Environment was intimidating & Non-friendly. I wish i had left the interview to record my anger.
A conversational phone screening lasting about 40 minutes.
There is a decent amount of legacy code and legacy systems.
Process is mostly traditional waterfall.
Some large teams: 15 people => 105 lines of communication
I applied through a staffing agency. The process took 5 days. I interviewed at WTW (Philadelphia, PA) in Mar 2009
Interview
At the time, the process was relatively simple. Knowledge of basic Object Oriented principles, C#, ASP.NET, SQL Server design. They are not a framework shop and you really only need to know how to code on all tiers of an n-tiered architecture. JQuery, Telerik controls, JavaScript, XML. They may have you complete a short written quiz on the technologies, but nothing a senior developer wouldn't be able to ace. Sharepoint experience would be a plus.