Line edit of a full startup course (native Serbian)

Startup Akademija teaches first-time founders through short interactive lessons. We need a sharp human editor for one complete course, "Validacija ideje za 14 dana". You will line edit its 14 lessons so they read as if a calm, experienced founder wrote them: natural sentences, informal "ti" address, no filler, nothing that sounds translated from English. Deliverable: all 14 lessons with tracked changes, plus a one-page style note on the patterns you fixed, so the same standard can carry over to the other courses. Done means: every lesson is edited, the meaning and the exercises are unchanged, and any fact you doubt is flagged rather than rewritten. Must know (mandatory): native Serbian, Latin script; professional editing or copywriting on published work; Pravopis Matice srpske; tracked changes in Google Docs or Word. Nice to have: startup or product experience; course writing.