BPF Senior Engineer Take Home Challenge

**Background:**

At Better Place Forests, we take our brand and our customer communications very seriously. We pride ourselves on our ability to deliver actionable, and personalized communications to our customers exactly when (and only when) they need it. Using text messages to stay in touch with our customers as they make their way through the sales funnel is an excellent tool we can leverage. That being said, asking our sales team and forest steward team to manually type out and send texts 7 days, 3 days, or 1 day before a customer visits the forest of their choosing to pick out a tree does not scale.

**Goal:**

We need a way to programmatically send out dynamic text messages to our customers containing information that is only relevant to them and their scheduled upcoming visit to the forest. Our marketing and sales teams are constantly improving our messaging to our customers, so these text messages need to be editable and configurable by anyone at BPF.  Additionally, we need to expose an endpoint to an external service that will handle the timing and to trigger sending the messages. This external service will try to ping your app to tell you which text message to send, and to whom.

**Requirements:**

* Your app will have a UI to manage custom text messages.
* Your app will be able to support merge tags in the text messages.
* Your app will need to be able to listen to an external service sending POST requests that show up when a particular text message should be sent.
* Your app will parse the payload of this incoming message which contains the information necessary to identify a customer as well as which text to send to this customer.
* Your app will support functionality around manually sending out any text messages to a given customer based on their email address.
* Your app will provide a way to view all text messages that have been sent so to ensure that our customers are getting exactly the right information (and that it is formatted correctly).
* Your app will have a database of customers that can be queried based on email address to find necessary information to populate merge tags and phone numbers


**Notes:**

This application should be written to production ready quality. Please provide all documentation, testing, etc to facilitate this. We use Rails at Better Place Forests, so please show us your skillset in this framework when implementing this feature. Additionally, our front ends are built on top of bootstrap for styling. This is not a requirement of this project, but having a thoughtfully presented UI will help usability for non-technical people.


**Freebies:**

For the purposes of this example, please use this fake internal gem that exposes a class to actually mock-send messages:

```
module BPF
  class Text
    attr_accessor :status, :message

    def initialize(response)
      @status = response[:status]
      @message = response[:message]
    end

    def self.send(to_number, from_number, body)
      ## Text sending magic here ##

      ## For simplicity,
      ## this is a black box that
      ## returns a success hash or an error hash at pseudo-random
      message_sent = [true, false, true, true].sample

      if message_sent
        response = {status: "success", message: body}
      else
       response = {status: "error", message: "Bad number"}
      end

      new(response)
    end
  end
end
```


**Deliverables**:

Please provide your work in a publicly available github repository. Additionally please document all necessary steps to run your app locally to test its functionality.

Bonus points if you also provide a link to a working version of your app. (We use Heroku for all application hosting at BPF)

**Timeline:**

This task should take you no longer than 3 days.