Protocol Stack Engineer (80-100%) Protocol Stack Engineer (80-100%) Threema is the world’s best-selling secure messenger for both private users and businesses. Since 2012, we have been working tirelessly to ensure that our users can communicate freely without worrying about their privacy. Our growing user base includes millions of private customers and thousands of businesses and organizations from all over the world. We are growing and looking for a new team member to join as a Protocol Stack …