I worked at Mainstream Advertising full-time (Less than a year)
It was a short experience, I don't recommend it to anyone. The sales reps were friendly folks and worked hard. Unfortunately the technical team members were not so friendly with each other. Am glad I don't work there anymore.
They were spammers and tried to hide it through different company names. No Quality Control processes at all resulted in releasing buggy software. The whole network was on the verge of collapse all the time. Did not appreciate the adult side of the business which was also hidden.
Advice to Management
Spend some money on infrastructure.
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