IT company Mastek will hire 5,000 professionals for a new campus at the Mahindra Industrial Park in Chennai.In the first phase, which is expected to be completed in the next one year, the company will recruit 1,100 professionals, it said in a release today.The company also said it is building a centre of excellence at the recently launched Chennai facility to acquire competencies in mainframe technology mainly in the insurance vertical. The recruitments for this unit is under process, the release added.Mainframe technology provides massive storage capacity and improves data security and flexibility in the client/sever design.