Anyone who has been unhappy in a job and then resigned has probably wondered just how candid one should be in that final parting communication. Usually one decides to hold back on being too honest about the frustrations encountered while working at a company if for no other reason than not burning one’s bridges. After all, one might need a reference in a future job and so discretion is the better part of valor when it comes to that final missive! At the same time one can understand the frustration of Cian Kelliher, who worked at the Dublin office of the Ernst & Young and felt the need to unload…