Portal of the federal government for skilled workers from abroad
https://www.make-it-in-germany.com/de/ueber-das-portal/kontakt/hotline/
Information on the residence of skilled workers without vocational training or academic education, including IT specialists without formal qualifications, on the website of the Federal Office for Migration and Refugees (German): https://www.bamf.de/DE/Themen/MigrationAufenthalt/ZuwandererDrittstaaten/Arbeit/FachkraefteOhneAusbildung/fachkraefte-ohne-ausbildung-node.html
Information on the stay of skilled workers without vocational training or academic education, among others for IT specialists without formal qualification, on the website of the Federal Office for Migration and Refugees (English):
https://www.bamf.de/EN/Themen/MigrationAufenthalt/ZuwandererDrittstaaten/Arbeit/FachkraefteOhneAusbildung/fachkraefte-ohne-ausbildung-node.html
This is the way to access the annual announcements of the Federal Ministry of the Interior on the minimum salary required for the residence permit for IT specialists without formal qualifications: Open the website of the Federal Gazette and enter the words Bekanntmachung zu § 6 der Beschäftigungsverordnung in the search mask there.
You can also obtain free advice on the topics of entry, residence and occupation from the Working and Living in Germany hotline of the Federal Government's portal for skilled workers from abroad
Phone: 030 1815-1111
Service hours: Monday to Friday from 8:00 a.m. to 4:00 p.m

Residence permit for the purpose of gainful employment Issuance for the purpose of employment with distinctive practical vocational knowledge