
Justus Hammer
Serial entrepreneur, investor, and CEO passionate about online marketplaces
Sydney, Australia
Joined April 2025
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Summary
Justus Hammer is a seasoned serial entrepreneur with a strong track record in founding, growing, and successfully exiting online marketplace businesses. His ventures include co-founding Spreets, which was acquired by Yahoo7 for $40 million, and Mad Paws, now Australia's largest online pet care platform. He demonstrates a keen ability to identify market needs, scale operations, and adapt strategies in dynamic tech environments. com+3
Beyond his entrepreneurial roles, Hammer is an active angel investor and advisor, having supported over 45 startups in two years. He provides strategic guidance and early-stage capital to emerging companies, particularly within the tech space, leveraging his extensive experience in online marketing, business processes, and fundraising. myworstinvestmentever+2
Hammer's early career foundation includes a Diploma in Macro Economics from Ludwig-Maximilians-Universität München and a Master of Commerce in Information Technologies from Macquarie University. This academic background, combined with initial roles in marketing for companies like GoYellow and GetPrice, provided him with a blend of analytical skills and practical online marketing expertise crucial for his subsequent success in digital ventures. edu+3
Work
Education
Hobbies
Played professional basketball for a period, developing determination and drive which he applies to his business ventures. myworstinvestmentever+1
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