There are a couple of Russian language news articles from 2013 which indicate that it was Alexei Soskovets who answered when correspondents applied for job ads posted by the Internet Research Agency.

Novaya Gazeta, September 2013:

We meet with a friend Alexei Soskovets – a native of the youth polittusovki. In “friends” VKontakte he has a lot of activists of the movement “Nashi”, “Young Guard of United Russia” and employees of the Committee for Youth Policy of St. Petersburg, including the former head of the committee Nikita Alexandrov.

In 2013, Soskovets’s “North-West Service Agency” won 18 contests for the organization of holidays, forums and sports events for St. Petersburg authorities. In half of the competitions the agency participated alone. In the summer of 2013, the contest for transport services for participants of the camp “Seliger” won.

Mr7, September 2013:

I call Alexei, whose phone number is indicated in the ads ( 1 , 2 , 3 ). This kind of hospitality is rarely seen in the interview: a young man escorts to his office, not yet fully equipped after moving to a new building, is wondering “how to get there” and “it is convenient to sit”, almost nothing asks the essence of the vacancy and prints a questionnaire about employment.

Alexei Soskovets is a young businessman, the organizer of the holidays and the “mayor” of the Committee for Youth Policy at the “Foursquare”. In 2013, its “North-West Service Agency” won 17 contests for the organization of holidays, forums and sports events for St. Petersburg authorities. In half of the competitions the agency participated alone. If anything remained from the budget for small holidays, everything  was given to the firm “Neva entertainant”, in which Alexey, according to public sources, is listed as the project manager. In the summer of 2013, “North-Western Agency” won the contestfor transportation costs of the participants of the camp “Seliger”. Journalists estimated that the cost of gasoline for the delivery of one activist cost the budget 1,800 rubles, although with an average consumption of gasoline would have turned out to be 300 – six times less.