Australia’s largest customer-owned bank brings modern digital banking to small businesses
About Great Southern Bank
Great Southern Bank (GSB) is the country’s largest customer-owned bank serving customers across Australia. A member-first powerhouse, GSB has built its reputation on competitive products, personal service, and a mission to make life better for members.
The opportunity
GSB saw a clear gap in the SME market and decided to lead from the front. They set out to build a business-banking experience that felt modern, fast, and designed for real business needs with four key goals:
Business banking that empowers
Deliver genuine value to SMEs (from micro-businesses to mid-market) with intuitive, integrated banking solutions that delight.
Digitally native
Replace “somewhat digital” with truly end-to-end digital, giving business owners the same smooth experience they have come to expect from modern tech.
Modern lending
Bring business lending into the new era: with unsecured loans, term deposits, and vehicle finance that are easy to understand and quick to approve.
Operational efficiency that scales
Run the business bank with a small, high-performing team by leveraging automation, self-service, and AI-driven workflows.
The solution
GSB Business+ built and launched fast
Constantinople is the engine behind Business+, a fully digital platform that went live in March 2024 and launched nationally later that year. The platform is already exceeding expectations, building a strong deposit base and serving a brand new business segment.
Complex onboarding streamlined
Company owners, directors, and administrators of companies, partnerships, and trusts can now onboard and set permissions entirely online. AI optimises document processing and boosts straight-through-processing rates, turning what used to take days into minutes.
Comprehensive transactional capability
Business+ delivers everything SMEs need to run their finances in one place with multi-level approvals, batch payments, expense management, integrated invoicing, and native Xero and MYOB connectivity.
Business lending that actually works
Working-capital facilities, equipment finance, and business term loans are now available digitally with ~10-minute credit decisions and seamless applications through to settlement.
Self-service that empowers bankers
GSB’s product, credit, and marketing teams can now configure products, run credit assessments, and access real-time portfolio reporting without manual processes or paper.
The result
“Constantinople is transforming how banks operate, giving us an unmatched advantage to move fast and lead the market in digital banking for small businesses.”
Paul Lewis, CEO, Great Southern Bank
This isn’t just a tech upgrade, it’s a commercial transformation.
GSB Business+ proves member-owned banks can compete head-to-head with the majors and neobanks, delivering fast growth, operational leverage, and experiences that make customers proud to bank with a mutual.
