After working in all the engineering/team/project management functions up to a CTO. As CTO he built software house 10-fold: from 6 to 60 people. After few years of being the CTO, he decided to go back to full-time engineering role and he works as a Principal Software Engineer in his company (and is super happy about it). Jarek has been working as an engineer in many industries - Telecoms, Mobile app development, Google, Robotics and Artificial Intelligence, Cloud and Open Source data processing. Jarek is currently PMC and active committer in the Apache Airflow project.