Here are Australian companies and consultancies known for combining human‑centred (user‑centred) design with software/product development. I’ve grouped a mix of large consultancies, design studios and product/development firms — each entry includes a short note and a web citation you can follow for details.

• Designit — global strategic design & product teams in Australia (Sydney/Melbourne). Service & product design, service design, product development. (au.designit.com)
• Fjord (Accenture Song) — design & innovation studio within Accenture with Australian studios; human‑centred service & product design at scale. (linkedin.com, adnews.com.au)
• ThoughtWorks (Australia) — technology consultancy that integrates strategy, UX and engineering; strong user‑centred engineering practices. (thoughtworks.com, investors.thoughtworks.com)
• Luminary — full‑service digital agency (Melbourne/Sydney/Brisbane) that emphasises human‑centred UX, digital strategy and development. (luminary.com)
• Bliss Digital — Melbourne/Sydney UX and human‑centred design studio that also delivers web/app builds. (blissdigital.com.au)
• UserCentric — delivery‑focused software & UX consultancy (customer‑centred design + application development). (usercentric.com.au)
• Momentum Design Lab — UX/product design studio (listed on Clutch) that pairs research‑led design with delivery capabilities. (clutch.co)
• Rendr Software Group — small product & development shop that combines UX/design with custom software development. (clutch.co)
• Humaan — Perth‑based product agency specialising in human‑first product design and in‑house development. (humaan.com, au.linkedin.com)
• Luminary (listed above) — included here as an established mid‑sized digital product studio with HCD + engineering. (luminary.com)
• Anthroware — human‑centred software development and product design studio (research, prototyping, development). (anthroware.com)
• Dovetail — Australian company that builds research & insights software used by UX teams (useful if you need a user‑research platform alongside design/development). (en.wikipedia.org)
• Nous Group — management & design consultancy with human‑centred design and service redesign work across government and large organisations. (nousgroup.com)
• Thought Collaborative / Think Human (examples of Australian boutique human‑centred consultancies) — smaller local consultancies focused on co‑design, service design and user research. (thoughtcollaborative.com.au, thinkhuman.com.au)

Notes:

• These firms cover different scales and industry focus (enterprise consulting through to boutique product teams).
• If you want an industry or region filter (e.g., government, health, NSW vs. WA) or a shortlist by approximate budget/ team‑size, tell me which constraints and I’ll refine this to 5–7 best matches and include contact pages.