3a Present appointments

• 2008 – onward. Civil Servant Lecturer in Mathematics Education. Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang (UNNES), Indonesia.
• 2023 – onward. Head of Sub Directorate of Reputation and Cooperation of Universitas Negeri Semarang (UNNES).
• 2023 – onward. Member of the Institute for the Development of Muhammadiyah & Aisyiyah Higher Education of Central Java.
• 2022 – onward. Head of the World Class University Programme Task Force, Universitas Negeri Semarang, Indonesia.
• 2018 – onward. Chief Examiner of Scientific Work of Cadets at Akademi Kepolisian RI (Indonesian Police Academy), Indonesia.
• 2021 – onward. Reviewer of Matching Fund and Competitive Fund Grants, The Directorate General of Higher Education, Research, and Technology (DGHERT), Ministry of Education, Culture, Research, and Technology (MOECRT) of Indonesia.
• 2018 – onward. Editor-in-chief of UNNES Journal of Mathematics Education (p-ISSN: 2252-6927, e-ISSN: 2460-5840) published by Department of Mathematics, Universitas Negeri Semarang, Indonesia.

3b Previous employment and appointments

• Winter Semester 2023: Teaching Fellow – Johannes Kepler University Linz, Austria.
• 2019 – 2023. Expert Staff of Rector of Universitas Negeri Semarang for Academic Affairs, Universitas Negeri Semarang, Indonesia.
• October – November 2021: Visiting Professor – Department of STEM Education Johannes Kepler University (JKU), Linz, Austria.
• October 2021: Guest Lecturer – Goethe University Frankfurt (GUF) Germany.
• November – December 2020: Visiting Lecturer – Universitas Pendidikan Indonesia (UPI) Bandung, Indonesia.
• July – August 2019: Expert Lecturer on Blended Learning – Universitas Samudera (UNSAM) Langsa Aceh, Indonesia.
• 2011 -2019: Educational Media Reviewer – Balai Pusat Pengembangan TIK Pendidikan & Kebudayaan (BPTIK) Jawa Tengah, Indonesia.
• 2008: Lecturer in Mathematics Education – Department of Mathematics Education IKIP PGRI Semarang (Teacher Education Institution), Semarang, Indonesia.
• 2007 – 2008: Mathematics Teacher – SMAN 1 Banjarnegara (Senior high School) Banjarnegara, Indonesia.
• 2005 – 2007: Mathematics Teacher & ICT Teacher – SMA Ibu Kartini Semarang (Senior high School), Semarang, Indonesia.