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Wonderschool Coding Challenge

Introduction

Thanks for your interest in joining the Wonderschool engineering team! Before we proceed with more formal interviews, we ask that all candidates take our coding challenge. The coding challenge is a foundational piece of our process and it's referenced later in our process during the technical interviews. Instructions for the coding challenge and submission process are outlined below.

For an experienced full-stack web developer, the coding challenge should not take longer than 2-3 hours to complete. We understand that everyone has different schedules and we are happy to accommodate your availability. If you need more time, please let us know.

If at any point you have questions concerning the coding challenge and/or interview process, please do not hesitate to email [email protected].

Coding Challenge

The coding challenge revolves around building a task list. Tasks belong to groups and can have dependencies on one another (i.e. if task X depends on task Y, task X cannot be completed until task Y is completed). The challenge includes 3 components:

  • Build React-based UI
  • Complete a backend interface
  • Design database schema

Build React-based UI

The UI consists of 2 screens:

  • Overview: Displays a list of all the groups along with their completion status. Clicking on a group should render the detail screen.

  • Detail: Displays a list of all the tasks in the selected group and allows the user to toggle the completion status of unlocked tasks.

The screens should look like this:

screen design

The data you should use to implement your solution is available at a GQL Query called tasks, you can find it on ./client/src/graphql/getTasks.graphql. SVG assets for the icons used in the design live in ./client/public/.

Requirements:

  • Locked tasks cannot have their completion status toggled
  • Tasks remain locked until all of their dependencies have been completed
  • When clicking the box to complete a task, you must use the toggleTask mutation.
  • Your implementation should resemble the above design
  • Please do not introduce any new dependencies, you should have everything you need to complete the challenge
  • We value well structured code that follows industry best practices

Complete a backend interface

As mentioned above, you will need to use the toggleTask mutation to complete/un-complete a task. To accomplish this, you will need to implement the backend logic for toggling the task.

Design Database Schema

Design a database schema to store the task list data by writing the SQL code needed to create the schema in schema.sql. The schema should define all tables, columns, and constraints needed to store the task list data.

Getting Started

  • To get started, clone this repo to your local machine.

  • Next you'll want to install the dependencies and run the client and server (we recommend using node 20 LTE):

    cd server
yarn install
yarn dev

    open other terminal on the root of this project

    cd client
yarn install
yarn start

At this point, the client and server should be running in development mode and any local modifications you make will be automatically detected and result in reloads.

You should only need to add/modify code in the ./client/src/ and ./server/src/ directory.

Submission

To submit your coding challenge, commit all your changes to the master branch and run the following commands:

# Make sure all changes were committed
git diff-index --quiet HEAD -- || echo 'You have uncommitted changes!'

# Create bundle to submit
git bundle create coding-challenge.bundle HEAD master

Email the generated coding-challenge.bundle file to [email protected]. We do our best to review and respond to submissions within 5 business days.

Thanks for taking the time to do this coding challenge and here's to hoping we talk soon!