Master's thesis on An action adhesion defended with very good distinction from the Faculty of Law and Administration at the University of Wroclaw in 2002.

In 2002-2005 Mr. Jasiński was a trainee prosecutor of the District Prosecutor's Office in Wroclaw.

In 2003-2005 he was a trainee bailiff by the Council Chamber of Bailiffs in Wrocław.

In 2006 Mr. Jasiński was included in the list of legal advisors by the District Chamber of Legal Advisers in Wrocław and was admitted to the bars of the District Bar Council in Wroclaw.

His professional activity began in 2002 working as a trainee bailiff, and then as the assistant bailiff.

In 2006-2007 he practiced the profession of legal adviser, and in 2007 he ran his own law firm.

Since 2013 he is a partner in the law firm "RHETOR" Sliwinski & Jasinski professional partnership.