venture capital lean startup saas finding investors software as a service startup fundraising startups neeraj agrawal t2d3 david skok matrix ventures growth replicable recurring revenue scale up guide b2b traction angel investor vc angel investors techfoundry mvp minimum viable product eric reis alex osterwald steve blank customer development lean launchpad business model canvas system strategy feedback loops process flow business model freshbooks dropbox evernote metrics freemium
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