I worked at Omnicom full-time
Great people. Atmosphere that is uplifting and creative. One of the best jobs as far as Omnicom and all of its subsidiaries.
Only downside was sometimes having to deal with a 3rd party they contracted to do IT work called DXE (also called HPE Services for a bit). DXE is the most unprofessional bunch of incompetent buffoons I have ever had the displeasure of coming across. What few times they didn't bungle they would outright lie and deceive. DXE is unethical and should be avoided.
Advice to Management
Use your own IT guys or keep going with DDB. CDS was better as well. You are a great company and are hurting yourselves being chained to the utter failure that is DXE. Use their failures to break the contract and move on as soon as you can. You really are one of the best companies out there. Be free and fly.
I applied online. The process took 2 days. I interviewed at Omnicom (New York, NY) in November 2017.
Recruiter was unprofessional, she sent me and email 5 minutes before asking something random about my resume and then called me 20 minutes after our schedule time. It was really weird.