Amichai launched the Israeli government's efforts for bettering regulation in 2013, and has led them since then. He has served as Head of the Better Regulation Unit since it was established in 2015. Throughout his professional career, Amichai has combined social activity with institutional infrastructure in government work, as well as philosophical research in academia. Amichai joined the Governance and Social Affairs Department at the Prime Minister's Office in 2010, initially working on social issues and later heading the Governance Division, which deals with the foundations for governmental work. Prior to working for the Israeli government, Amichai worked in the third sector, mostly in Aharai! (Follow Me!), an NGO which integrates youth from Israel's socioeconomic periphery into Israeli society. Amichai managed the learning center and served as Resource and Strategy-Development Manager of the organization.
ראש אגף מדיניות רגולציה במשרד ראש הממשלה. זהו תפקידו השלישי במשרד לאחר שמילא שני תפקידים באגף ממשל וחברה. בעברו כיהן במגוון תפקידים עד מינויו לסמנ"כל עמותת 'אחרי! נוער מוביל שינוי'. עמיחי בעל תואר ראשון ושני בפילוסופיה ולקראת עבודת דוקטורט.