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Re:Slack Closes $250M Funding Round at $5B Valuation by itomato on Monday September 18, 2017 @12:19AM (#15273376)
A competitive app would have:

- easy signup for public access

- integrations for killer apps in other verticals

- plugin architecture

- public and private apis

- mobile app(s) with 80% of core desktop functionality

- end-to-end encryption

Maybe it's sufficient to extend IRC. Add support for custom emojis & Giphy integration.

Voice, video conferencing and screenshare would be essential.

Re:Slack Closes $250M Funding Round at $5B Valuation by c-smile on Monday September 18, 2017 @12:43AM (#15273454)
I've participated in design of application similar to that (it is already on the market): voice, video, camera desktop sharing and textual chat. First version was made in 9..11 months: core UI team - 3 developers for desktop. 2 developers for mobile clients, one for each platform. Server side 3-5 as it supports video transmission for 1000 and more participants. Platforms: Windows, Mac OS, Linux, Android and iOS. Small, manageable and so effective professional team.