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Data Engineer Technical Assessment

The purpose of this assignment is to assess your familiarity with the technologies in our data stack. Please read all the instructions carefully. This exercise should take about 1 to 2 hours to complete, but may take longer if you're unfamiliar with dbt or need to install additional dependencies locally.

Instructions

  1. Set up your local development environment as outlined here.
  2. Clone this repository locally.
  3. Complete the goal described below
  4. Submit all deliverables

Goal

The database instance is a copy of the Sakila sample database. The database models the data for a DVD rental store.

ERD

Your goal is to create models to enable an analyst to answer the following question:

What are the most popular categories of rented films by month?

Add your models to the models directory. You can use whatever organization and conventions reflects your understanding of best practices around dbt and data modeling in general. Update dbt_project.yml to reflect your changes to the models.

You do not need to model all the data in the database, only what's required to answer the question above. However, the models should reflect the fact that additional data may need to be exposed in the future to meet additional data needs.

Note: When developing locally, make sure to append the --profiles-dir . option when running any dbt commands so that the provided profiles.yml file is used.

The dbt run and dbt test commands should execute successfully on a completed project.

Lastly, update query.sql with a SQL query that can be executed against the generated model tables to answer the analyst's question.

Deliverables

Make sure you've committed all your changes, then generate a zip of the local branch:

git archive HEAD -o assessment.zip

Local development environment

  1. If not already installed, install dbt-postgres (instructions)
  2. If not already installed, install Docker (instructions)
  3. Build database image
docker build --tag contra-assessment .
  1. Start database
docker run --name contra-assessment --detach --publish 5438:5432 contra-assessment
  1. Verify the database is accessible at postgresql://postgres:workthewayyouwant@localhost:5438/postgres

Helpful resources

  • Sakila sample database documentation (link)
  • dbt documentation (link)