With over 12 years of consulting experience at Robert Bird Group, Bonar has managed a diverse range of projects spanning infrastructure, commercial, residential, and retail sectors. His expertise includes mixed-use developments, retrofitting existing structures, temporary works, heritage refurbishment, marine and deep basements. Bonar has overseen the construction methodology and staging of numerous projects, including complex major infrastructure developments, across Sydney, Brisbane, and London.

Bonar has effectively led teams of engineers and drafters, overseeing conceptual design, multidisciplinary coordination, detailed design completion, and construction phase support. His collaborative approach to working with contractors to develop cost-effective buildable solutions and construction methodologies has resulted in substantial savings in both time and money.

Some notable projects Bonar has contributed to at Robert Bird Group include Cross River Rail (Brisbane, Australia), Sydney Metro, 2B-6 Hassall Street, Parramatta (Sydney, Australia), Battersea Power Station Regeneration, 21 Moorfields, Bank Station Capacity Upgrade, and Nova Victoria (all in London, UK), along with Pendle Hill Station Upgrade and Museum Station Easy Access Upgrade (both in Sydney, Australia).