Musenga's first posting was in 2000, when the Minister of Foreign Affairs of the Democratic Republic of the Congo) deployed him as a temp at AMBARDC New Delhi, India. Two years later, he was hired in the Public Service and assigned to Foreign Affairs Ministry (Order Nº CAB.MIN/FP/MJ/kit/181/2002 of May 8, 2002 On Admission Sub-status and Appointment of Public Service Career Agents of the State of Different Ministries), hence the starting point of his diplomatic career.
He was transferred to AMBARDC New Delhi at the rank of 2nd Secretary of Embassy (aka ATB2), on January 29, 2003 (Transfer Order Nº 131.1/165/2003 of January 29, 2003 to exercise the functions of 2nd Embassy Secretary). He joined the Corps of Diplomats of the Republic at the rank of 1st Secretary of Embassy (aka ATB1) on May 10, 2003 (Order Nº 130/006 of May 10, 2003 of the Minister of Foreign Affairs and International Cooperation, page 3, relating to integration into the diplomatic corps of the Republic)
Musenga was promoted to the rank of 2nd Embassy Counselor (aka Chef de Bureau), on September 27, 2006 and transferred to AMBARDC New Delhi (Transfer and Regularization Order Nº130A.E/131.1/1197/2005 of September 27, 2006 to exercise the functions of 2nd Counselor of Embassy)[2][3]
Twelve years later, he get promoted to the rank of First Advisor (aka Chef de Division), by Order Nº 130/0006/2018 of January 23, 2018 supplementing and modifying Collective Commissioning Nº 130/0001/2017 of December 22, 2017 for Agents and Officials of the Ministry of Foreign Affairs and Regional Integration[4][5][6]
Minister Counselor 2022
On May 5, 2022, Kasongo get promoted Minister Counselor (by Order Nº 038/CAB.VPMIN/FP-MA-ISP/JPL/2022 of on the interim appointment of career staff to public command posts State services of the various Ministries) thus became a career member of the Senior Foreign Services.
Alerted by the cry of distress of Congolese players stranded in Sudan following the war, the Minister of Sports and Leisure, Mr. Kabulo informed President Félix Tshisekedi. The latter entrusted this emergency mission to his extraordinary and plenipotentiary ambassador in Egypt, Kasongo Musenga who brought back all the players safe and sound. It is Fabrice Ngoma, Steven Ebwela, Glody Lilepo and trainer Eugène Bulayima who are finally in Kinshasa, accompanied by the ambassador Jean Baptiste Kasongo Musenga. They were welcomed at N'djili Airport, in the early afternoon of Monday, May 15, 2023, by the Minister of Sports and Leisure François Kabulo Mwana Kabulo.[7]