After graduation of Higher Officers School of Mechanized Forces in 1989 his first assignment was a platoon leader 2nd Reconnaissance Battalion and later company commander. His next assignment was the 5th Mechanized Division and further military education.
Lieutenant General Malinowski later took the position of a senior operations officer in the 17th Mechanized Brigade, and in 2000, he became a battalion commander. Three years later, he took command of the 10th Reconnaissance Battalion and was sent to The Hague to complete a NATO staff officer course.
In 2004, Lieutenant General Malinowski served within the Polish Military Contingent in Iraq for the first time, as the chief of a reconnaissance unit. Upon his return to Poland, he served as the Chief of Staff of the 17th Mechanized Brigade for another two years. In 2007, he returned to Iraq as a deputy brigade commander.
From 2008 to 2011, Lieutenant General Malinowski served at Headquarters Supreme Allied Commander Transformation (HQ SACT) in Norfolk, USA. Simultaneously he completed postgraduate studies in crisis management and civil defence at the Higher School of Business in Gorzów Wielkopolski, and a planning course for NATO staff officers at the NATO School, Oberammergau.
In 2012, Lieutenant General Malinowski became the Deputy Chief of Staff for operations in the 11th Armoured Cavalry Division. Once the restructuring process of the Polish Armed Forces started, he took the position of a team chief within the Organization Group of the General Command of the Polish Armed Forces.
Nextly in 2014, he was appointed as Chief of the State Defence Readiness Unit in the Department of Defence Strategy and Planning of the Ministry of Defence.
Between 2015-2018 served as a Commander of the 17th Mechanized Brigade.
In March 2018, Lieutenant General Malinowski became Chief of Staff of the Multinational Division Northeast and was promoted to Brigadier General. On almost every position not only in Poland but also abroad he has been involved in operational and logistical planinig proceses.
In November 2019, he was appointed Chief of Staff of the General Command of the Polish Armed Forces.
On the eighth of October 2021, LTG Malinowski assumed command of the Joint Warfare Centre (Stavanger, Norway). His time at the helm of this organization has brought him countless insights, challenges, and achievements. He served as the Officer Directing the Exercise for the STEADFAST JUPITER and STEADFAST JACKAL series, including STEADFAST JUPITER 23 (October 2023), which involved nearly 7,000 participants from NATO and partner countries and took place across 27 locations in Europe and North America. In January 2022, he was able to declare that the JWC’s wargame design capability was fully operational. In May 2024, LTG Malinowski directed NATO’s first major joint exercise for the new Allied Reaction Force, which was scheduled by Supreme Headquarters Allied Powers Europe to train and evaluate NATO Rapid Deployable Corps Italy as the first NATO ARF headquarters.