As part of the candidate evaluation process, you will complete a simple project in React that will be used to evaluate your skills.

Project Overview

The Lucit Application delivers advertising images in real-time to digital billboards. Each time one of the images is displayed on a digital billboard screen, that system delivers a “pingback” to our system notifying us that the image was displayed.

You may login to the Lucit App to get an idea of what some of these images look like. You have been given access to “Demo” accounts within Lucit that you are free to play around with.

Your project is to build an application that simply shows the last image that was played on a digital billboard, when and where it played. This application will be an internal application that we will run on screens / TV’s inside of our office so we can see, in real-time, the most recent image that we ran.

Evaluation Criteria

Your work will be evaluated based on

  • How well you followed the project requirements / instructions
  • What you did differently than other candidates
  • The quality of your code, your commits and the organization of your components, files, etc.
  • What you innovated / added / created beyond what was listed in the project requirements


In order to build this project you will need

  • The Lucit App – You will receive an Invite to the App – Which can you can install from the App Store or Play Store (see here for help OR, you can login to the application at
  • An API Token – You must REQUEST an API Token, by submitting a HELP Request from within the Lucit App – Click on “Help” in the toolbar and then type the following into the Help Request box : “API Token Request for Entry Level Developer Project : {Your Name}”
  • A github account. You will push your project to your github account for us to review

Project Requirements

A successful project will

  • Be able to run on any windows / mac / linux machine in the browser
  • Must be able to launch from the cli (e.g. using something like npm start )
  • Look great on a variety of screen sizes (from a 60″ TV down to a small 13″ Screen)
  • Take into account a large range of billboard image sizes (some are 160px wide, some are 1800px wide, some are long rectangles, some are short and square)
  • Shows a new image every XXX seconds
  • Always shows (or attempts to show) a different image from a different campaign than the previous one that was displayed
  • Show the location and operator of the digital billboard that the image appeared on


Your project should be

  • Pushed to a new repo in your personal github account.
  • Please call this repo lucit-dev-project-a-{your-first-name-and-last-initial}
  • Notify Lucit by sending an email to with the exact subject line Entry Level Developer Project A : Submission


Pingback A pingback object is created every time an image is displayed on a digital billboard. Typically a pingback will tell us where, when, and for how long an image appeared on the digital billboard
Inventory Export In our terminology an Inventory Export is equivilent to a Campaign.
Digital Board A digital billboard – a large digital screen normally mounted on a large pole or other structure that has a physical location
Agency Most commonly a Billboard Operator, this is the company that owns the physical billboard that the images running on
Inventory Photo This object represents the actual creative image

API Endpoint

We have created a specific endpoint in our api that can be used to fetch the most recent image and associated details

endpoint : GET

returns : json array with an element called pingbacks which contains a single pingback representing the last image that ran


Parameter Type Description Example
api_token required string An api token will be provided to you and will be required to make the call to the api ?api_token={yourtoken}
exclude_export_ids optional array

Each image is assigned to an “export” which is a group of images that will run on any given set of bilboards.

Use this option to exclude 1 or more export_id’s from being selected

exclude_photo_ids optional array

Each image has a “photo_id” that uniquely identifies it.

Use this option to exclude 1 or more photo_ids from being selected



A description of some objects and fields

NOTE: Not all fields are described and not all fields will need to be used within your project


Represents the event of when and where this image played.

id Unique Id of the pingback  
photo_id The unique id of the image that played  
play_datetime UTC datetime of when the image played on the billboard  
play_duration How long the image was on the screen  
inventory_export_id The export to which this image belongs  
object_id Always the same as photo_id  
object_class Always InventoryPhoto  
board_id Unique ID of the Digital Billboard  
impressions Sometimes zero, sometimes a number. This is an estimate of the number of People that saw this image  
impressions_calc_method If 0 – no impressions. If 1 we have it calculated based on an avg daily total  


This is the screen on which this advertisement was displayed. Typically these are large screens mounted atop a pole at a location

id Unique Id of the digital board  
agency_id Id of the operator that owns the board  
board_identifier An id that is used by the board owner to identify their board.  
name A name of the board – sometimes its location or address  
location_id Id of the location object where this board is physically located at  
width Width in pixels of this board  
height Height in pixels of this board  


Location objects are physical locations used to identify where a board is.

id Unique id for this location  
name A name for this location  
address Address of this location  
city City  
state State  
postal_code Zip Code  
Country Country  
latitude Latitude  
longitude Longitude  


The “agency” represents the owner of the digital billboard. Called an Operator or a Billboard Operator

id Unique id
name Name of the Billboard Operator
options.primary_image_public_url The logo or icon for the billboard operator


The inventory_photo object represents the image that was displayed

id Unique photo_id for this image  
inventory_item_id Images (1 or more) can be attached to a single inventory item which represents this specific creative in multiple sizes or styles  
options.public_url The url to this image  
options.dimension_width Width in pixels of this image  
options.dimension_height Height in pixels of this image  
public_url Same as options.public_url  


The “export” can be thought of like an “Advertising Campaign” This campaign contains multiple “inventory_photo” objects and is attached to multiple “digital_board” objects

id Unique id  
name Name of the campaign  
options.primary_image_public_url If this exists, it is an icon for the campaign