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Assignment: Cloud deployment through infrastructure-as-code

The goal of this assignment is to verify that you can apply cloud engineering and devops techniques in practice. To do so, we ask you to deploy an application to AWS, incl. all the infrastructure that is needed to run the application.

Instructions

As a side-hustle, Source has built an amazing and game-chaning TODO-app: Todoozie. The backend of Todoozie needs to deployed to the AWS cloud in a scalable and reproducable way. We are strong believers in infrastructure-as-code and we hope you are too! So your mission - should you choose to accept it - is to make sure our backend is deployed completely through code. This means that we should be able to reproduce the deployment completely without having to touch the AWS Web Console.

We will provide you with a sandbox account on AWS to develop and test your solution. Credentials have been provided per email.

Requirements

In the end, you should have the following:

  1. The application code is running somewhere in AWS
  2. There is a PostgreSQL database running on AWS and the application can connect to it
  3. The API that the backend exposes, is reachable over the internet, so we can access it from our (fictional) frontend

Some hints and tips:

We have made things easy for you by already Dockerizing the application. But that doesn't mean you have to use Docker to run the application on AWS. You can choose whatever platform/service you think fits this application best.

You can start the application and a PostgreSQL database locally to test thigns out. You can do this by running Docker Compose from the root of this repository:

docker-compose up

The application is configured through environment variables. Study the docker-compose.yml file and/or the application code to see which environment variables are needed to make the application run.

When documenting your solution, you can also use visuals to describe the architecture of your solution.

Bonus objectives

  • The application has authentication built in, but you can add an extra layer of security by requiring API key & secret for accessing the API
  • Build a CI/CD pipeline using Github Actions to deploy new versions of the application:
    • When new code is pushed, build new Docker images
    • Publish the Docker images somewhere
    • Deploy the new Docker image in the AWS setup you created
  • Add some form of monitoring to see and be notified if the application is still healthy

Non-functional requirements

  • Everything is deployed using infrastructure-as-code
  • You will use AWS CDK to deploy the code and infrastructure (this is also what we're using at Source.ag)
  • You can use whatever programming language is supported by CDK: TypeScript, Python, Java, .NET, or Go
  • Please make sure the final commit to your repository is done at least 24 hours before the start of your interview

Deliverables

This assignment should be delivered in the following way:

  • All (CDK) code is pushed to your private copy of this repository
  • Documentation is provided in the README.md on how the solution works, and how to deploy it

Assessment Criteria

The solution will be assessed on the following criteria:

  • How is your code structured? Is it easy to read and follow?
  • How clear is the documentation?
  • How secure is the deployed infrastructure?
  • Are there any clear bugs in your code?
  • Can you clearly and concisely describe the process you have followed and the choices you have made?
  • Can you describe the biggest short-comings of your solution and which steps could be taken to improve on that?

IMPORTANT

You can keep the application and the infrastructure you've created running in the Sandbox account until the tech interview. There you will show us that it's all running and how you've set it up.