Olivier obtained a First Class LLB with honors from Middlesex University, London, United Kingdom in July, 2014. He thereafter successfully completed the Bar Professional Training Course at BPP Law School, Holborn, London and was called to the Bar of England & Wales in July, 2015 as a barrister-at-law. In October, 2015, he commenced his pupillage with the Law Chambers of Francis Chang-Sam, S.C resulting in his call to the Bar of Seychelles and admittance as an Attorney-at-law in October, 2017. On the 1st April, 2020, Olivier and Edith formed Chang-Leng and Wong Law Chambers and have been in operation since.
During his time as a pupil and attorney-at-law, Olivier has been involved in several key high profile cases in Seychelles, such as being a part of the legal team which assisted the former Chief Justice of the Seychelles in the Tribunal of Inquiry set up to investigate her, as well as numerous high value commercial deals, including the proposed acquisition of Habib Bank Limited, the financing of the second phase of the Eden Island project and the acquisition of Cable and Wireless (Seychelles) Limited by a consortium of Seychellois investors in what was the biggest leverage buyout in the history of Seychelles.