Grzegorz Niewisiewicz

62.01.Z - Computer programming activities

62.02.Z - Computer consultancy activities

62.03.Z - Computer facilities management activities

62.09.Z - Other information technology and computer service activities

63.11.Z - Data processing, hosting and related activities

63.12.Z - Web portals

63.99.Z - Other information service activities not elsewhere classified

77.29.Z - Rental and leasing of other personal and household goods

85.59.B - Other out-of-school forms of education, not elsewhere classified