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Re:Slack Closes $250M Funding Round at $5B Valuation by c-smile on Sunday September 17, 2017 @11:31PM (#15273207)
I personally can do UI of Slack client in 5-8 months (so 5-8 man/months) + one/two backend developers needed. And it will be almost native client with client distribution less than 5mb.

As a proof, it took me 2 months to make this application: https://notes.sciter.com/ (and site for it in that time too).

Re:Slack Closes $250M Funding Round at $5B Valuation by askafriend on Sunday September 17, 2017 @11:59PM (#15273303)
That's the easy part. The hard part is scaling, marketing, and building a business/platform around the product so that you take it worldwide.

Several people have built Slack clones and there's even multiple open source projects out there. Building a company and business at a scale like Slack is the incredibly difficult part and nobody has managed to replicate that.

Re:Slack Closes $250M Funding Round at $5B Valuation by c-smile on Monday September 18, 2017 @12:34AM (#15273426)
That's true. My personal educated estimation is that only 5-10% of income is spent on R&D in established companies.
Re:Slack Closes $250M Funding Round at $5B Valuation by ctraganos on Monday September 18, 2017 @09:47AM (#15275859)
I'd pay for an alternative "lite" Slack client for basic channels, DMs, and attachments. With 10+ accounts, my 2017 mac struggles under the weight of the Electron mac client