The document describes TLKR.io, a website that allows users to practice languages with native speakers for free via video chat. It was created by Javier Cuevas at a hackathon two years ago. The website is built with Ruby on Rails on the backend and uses WebRTC for peer-to-peer video calls between users. It allows users to earn minutes to practice languages by helping others with their native language. The creators are working to gain more traction for the website.

1. Practice any language with native speakers
...for free!
Handcrafted with ♥ by

2. About me:
Javier Cuevas
@javier_dev
Ruby on Rails Shop P2P marketplace for dog owners

3. Problem
Thanks to the Internet
learning new languages
today is easier than ever.

4. Problem
BUT...

5. Problem
Practicing languages
with native speakers is not easy.
Or at least, it’s not cheap.

6. Solution
TLKR.io
connects you with native
speakers from all over the world.
Videochat with them
right in your web browser.
It’s free. It’s fun.

7. Our story
2 years ago
me! victor
(cto @ diacode)

8. Our story
Launch Festival Hackathon

9. Our story
12 hours later...

10. Our story
24 hours later...

11. Our story
28 hours later...

12. Our story
Fast forward to today
Kick ass team of 5 developers
working remotely and enjoying life

13. Our story
LET’S
REBUILD
THIS THING
from scratch!

14. Our story
1 MONTH
4 SPRINTS
5 DEVELOPERS

15. Product

16. Product

17. Product

18. Product

19. Product

20. Product

21. Business Model
now you are
probably thinking...
OK. THIS IS
COOL, BUT...

22. Business Model
...HOW DO YOU
MAKE MONEY?

23. Business Model
TLKR.io is free as long as you help
others practice your
native language.
For every minute you help
someone, you’ll get two
to practice.
If you only have time to practice,
you can buy more minutes.

24. Business Model

25. Business Model

26. Technology
Front-End
○ HTML5 & CSS3 ➔ HAML & SASS
○ Bourbon & Bitters + Neat
○ CoffeeScript + React.js (coming soon)
○ SimpleWebRTC
○ WebSockets (for text chat)
Back-End
○ Ruby on Rails 4
○ PostgreSQL
○ Sidekiq + Redis (for background workers)
○ Node.js + Socket.io (for WebRTC signaling)
○ APIs
○ Stripe
○ Facebook connect
○ Mandrill
○ Freebase (for users’ interests)

27. Technology
WebRTC
BASICS

28. Technology
WebRTC enables modern browsers to:
○ P2P data sharing
○ Access webcam and microphone
(without external plugins)
○ P2P audio / video calls
○ And other stuff I don’t have time to explain today…
WebRTC is supported in:
○ Google Chrome (including Android)
○ Firefox (including Android)
○ Opera
○ Bowser (only iOS)

29. IF IT IS P2P
WE DON’T NEED
A SERVER,
RIGHT?
MEH!
Technology

30. Technology
WebRTC P2P video calls require:
○ STUN server
google public stun server
To figure out what’s the public IP for each peer.
○ Signaling server
To “introduce” one peer to another.
○ TURN server (optional)
node.js + socket.io
we don’t have one (yet)
As fallback for peers who are behind complex
firewalls.

31. We are at the starting point
of our adventure.
We still need to figure out
how to get traction.
You can help us to make
TLKR.io awesome.
Current Status

32. Takeaways
○ Sign up for TLKR.io today
And get 100 minutes free!
○ Go to Hackathons
Build things, break them, fix them and try to ship
them to users.
○ Traditional Education is f*cked up
Use technology to fix it.
○ WebRTC is awesome
You better start building something with it today.
If you don’t, you’ll regret. :)

33. THANK YOU.
QUESTIONS?
https://TLKR.io
hello@tlkr.io
@tlkr_io