Callstack - Hire-us DevelopmentConsultingTrainingsTeamOur workJoin usCommunityHire usHelloGet up to speed with your cross-platform development or just say hiSend InfoCallstack.io Sp. z o.o.Rybacka 7, 53-656 Wroclaw, PolandVAT number:PL8992785616AboutTeamOur workCommunityJoin usOfferTrainingsDevelopmentConsultingContactHire us2018 Callstack. All rights reserved.Cross-platform experts serving you from Wroclaw, Poland.Callstack.io Sp. z o.o. seated in Wrocław, Poland, at Rybacka 7, 53-656 Wrocław, entered in the Register of Entrepreneurs of the National Court Register, kept by the District Court of Wrocław-Fabryczna in Wrocław, VI Commercial Division of the National Court Register under the number 0000606530, with share capital of PLN 8,000.00, with tax identification number (NIP) 8992785616, and statistical number (REGON) 363921820.