Developing e-Market Information System Android Based in Minahasa Regency Keith Francis Ratumbuisang, Yosua Fitsgerald Ratumbuisang, Mario Tulenan Parinsi Jurnal Fokus Elektroda : Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali) Vol. 7 No. 1 2022 DOI 10.33772/jfe.v7i1.22211