Rémi joined the European institutions in 2004, after a career in investment banking that included private and public sector assignments, including financial system reform missions in CIS countries, Asia, North Africa and the Middle East.

He first served four and a half years at the EU Delegation to Ukraine, as head of operations section. As country officer for European Union–Republic of Moldova relations, first at the European Commission (2008-2010), then at the European External Action Service (2011-2014), he coordinated the visa liberalisation process, the preparation of the EU–Republic of Moldova

Association Agreement, and advised successive EU Special Representatives in the Transnistrian settlement process.

In 2014, Rémi joined the European Commission Support Group for Ukraine, before moving to Kyiv in January 2017 to advise, later deputise for, the Special Representative of the Chairperson- in-Office of the Organization for Security and Cooperation in Europe (OSCE) in Ukraine and in the Trilateral Contact Group, the OSCE negotiating platform on the conflict in eastern Ukraine. Since 1 January 2021, Rémi has been the Deputy Head of the EU Delegation to Ukraine.