Employees at Germany’s Postbank are expected to stage further strikes in the coming days as part of a wage dispute with the firm, a subsidiary of German financial giant Deutsche Bank. The trade union verdi has called on around 4,500 back-office workers at Postbank, who process banking transactions, to strike over the course of the week. The latest strike call follows a series of smaller strikes last month that shuttered Postbank branches. Verdi negotiator Jan Duscheck said that back-office employees at Postbank have faced heavy work burdens in recent months as the bank switches its computer sy…