In the period 1985 to 1998 Bruno was principal of Bruno Kiernan and Associates and then senior partner of Kiernan Bryant & Bourke. Both firms focused on criminal law and coronial inquests. During this time Bruno was perhaps best known for representing the families of several men fatally shot by police at the Police Shootings Inquests.

In 2000 Bruno completed an MBA at Melbourne University and worked as a senior associate at a leading management consulting firm until 2004. During this period he delivered professional development programs to executives in both private corporations and government departments.

In 2005 Bruno recommenced practising law and joined leading family law firm Carew Counsel. From 2005 to 2007, he variously instructed or appeared as counsel in parenting and property hearings before the Family Court and Federal Magistrates' Court. He also variously instructed or appeared as counsel in de facto hearings before the County and Supreme Courts.

In 2007 Bruno was appointed a registered Family Law Dispute Resolution Provider by the Attorney General's Department (Cwlth). Since signing the Bar Roll, he has continued a focus on the Family Law and DeFacto jurisdictions.