Roberts-Smith appeared opposite Emma Matthews in 2016 as Zurga in the West Australian Opera production of Bizet's Les pêcheurs de perles.

[28] For Deutsche Oper Berlin he has appeared in over a dozen productions, including La traviata opposite Leo Nucci in August 2017,[29] Il Barbiere di Siviglia in October 2017,[30] Lady Macbeth of Mtsensk in April 2018,[30] Rigoletto in May 2018 opposite Simon Keenlyside,[31] Il viaggio a Reims in June 2018,[32] and Andrea Chénier in November 2018.

[30] In 2019, Roberts-Smith appeared in La traviata for West Australian Opera,[33] understudied the role of Judge Turpin and performed in the TEG Life Like Company's Sweeney Todd starring Anthony Warlow and Gina Riley,[34][35] performed Brahms' Requiem with the Sydney Philharmonia Choirs,[36] the title role in Le Nozze di Figaro for the Australian International Productions tour of China,[37] starred in Barry Conyngham's Australian opera Fly,[38][39] and completed a Graduate Diploma of Human Resource Management from Edith Cowan University.

In October that year, Roberts-Smith performed the title character in the Australian premier of The Enchanted Pig[40] in collaboration with internationally renowned Director Gale Edwards AM and Academy Award winning costume designer Tim Chappel.

[44] Roberts-Smith has a Master's degree in Human Resource Management from Edith Cowan University[45] and appears on the ECU School of Business and Law's 2021 Dean's List.