The decision was taken by director of planning Graham Duncan, who heard the case earlier this month. Mr Shield is expected to appeal. The two and a half day hearing considered allegations that Mr Shield contravened the council's selection and recruitment policy and wilfully failed to implement an instruction from chief executive Paul Lowenberg.
According to a council statement, Mr Shield was told not to make an appointment to the post of contracts officer without the agreement of director of personnel and management services Don Hughes.
'The allegations were found to be substantiated and amount to an irretrievable breakdown in trust and confidence between employer and employee - and that they separately constitute a gross breach of discipline', said the statement.