[5] In September 1969, Kwiatkowski worked as an assistant in the Office of Urban Planning at the Lublin Provincial Committee.

From March 1972 to October 1974, he worked as a designer at the branch of the State Company - Office of Monuments Restoration (Państwowe Przedsiębiorstwo Pracowni Konserwacji Zabytków - PP PKZ) in Lublin.

He, along with Vietnamese experts, researched and prepared a program to restore medieval works of the Cham culture in central Vietnam.

The mission focused first on the brick worshiping towers at the holy site complex in the former Amaravati territory of the ancient Champa kingdom.

During his time in Mỹ Sơn, eight people in Kwiatkowski's archeological team died from both bombs left after the Vietnam War and illnesses.

[12] From 1981 to 1988, he and a team of photometric experts worked in Vietnam, performing restoration records at the ratio: 1:20 and 1:50 for more than 30 projects.

Measurements were carried out not only in Mỹ Sơn, but also in Phan Rang, Quy Nhon, Bắc Ninh, Tam Kỳ, Quang Nam and Tuy Hòa.

[13][14] In early 1995, Kwiatkowski and his team began work related to the re-evaluation of the temple-palace complex on the territory of the Imperial City of Huế.

[12] Working in Vietnam for 17 years, Kwiatkowski died on 19 March 1997 at a hotel in Huế, due to a heart attack while still actively participating in the restoration of the Imperial City.

In 1999, a collection of articles about him was published in Vietnam with the title Kazik, ký ức bạn bè ('Kazik, Memories of Friends').

In 2017, on the 20th anniversary of his death, the Vietnam-Poland Friendship Association together with Polish Embassy in Hanoi organized an event to commemorate Kwiatkowski.