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Technical choices

  • Husky : pre-commit to run test on every commit.
  • Eslint : Airbnb => I agree with most of the decisions (I changed some specific rules).
  • Updated tsconfig to use aliases and run on test files.
  • Custom babel to correctly run Jest's tests with TS & aliases, etc...
  • Unit Tests on components & services... just do yarn test --coverage.
  • Possibility to login from any user on homepage.
  • Handle errors gracefully and display message to user.
  • Each users can send/receive messages.
  • AutoScroll to the most recent message.
  • Use of nextjs layout to keep UI non-flashy and fluid between pages
  • Use of tailwindcss, because my friend told me “it's cool”.
  • Awesome brand ascii art.
  • Sharp, minimal and eye breaking UI.
  • Responsive design.
  • Init axios interceptors for logging service.
  • Fixed interface conversation (missing lastmessagetimestamp)
  • Fixed typo in db.json ('second' => 'deuxième')

Screenshots

home conversations messages

Signature

  __          ___                    
 /\ \        /\_ \    __           
 \_\ \    ___\//\ \  /\_\     __   
 /'_` \  / __`\\ \ \ \/\ \  /'__`\  
/\ \L\ \/\ \L\ \\_\ \_\ \ \/\  __/  
\ \___,_\ \____//\____\\ \_\ \____\  
 \/__,_ /\/___/ \/____/ \/_/\/____/

Context :

At leboncoin, our users can share messages about a transaction, or ask for informations about any products.

Your job is to create the interface to consult those messages. The interface needs to work on both desktop & mobile devices.

In addition to your code, a README explaining your thought process and your choices would be appreciated.

Exercice :

  • Display a list of all the conversations
  • Allow the user to select a conversation
    • Inside the conversation, there is a list of all the messages between these two users.
    • As a user, you can type and send new messages in this conversation

As your application can be used by millions of users, make sure to provide some robust safety guards.

Sketches :

Obvisouly, it is up to you to make something nice and pretty, you are free to design it the way you like. The sketches are here to give you an idea on how it should look.

Click to see the sketches

Mobile list :

Desktop list :

Mobile conversation :

Desktop conversation :

API :

You can find the API swagger file in docs/api-swagger.yaml.

For a better readibility, you can view it on https://leboncoin.tech/frontend-technical-test/.

Bonus 1 :

We provide some conversation samples, but can you improve the app so the user can now create new conversations ?

Bonus 2 :

Our infrastructure is a bit shaky.. Sometimes the servers are crashing. “It’s not you, it’s me”, but maybe you can display something nice to warn the user and handle it gracefully.

Do you want to make the app even better ?

Feel free to make as many improvements as you like. We love creativity and technical challenges.

If you are out of ideas, here are some thoughts :

  • As we want to reach our users anywhere, we need to make sure the app is performing well. What can you do to make it really fast ?

  • Our goal is to support everybody in the country, including people with disabilities. As a good citizen and a good developer, can you make sure the app is accessible for everyone ?

  • We all love to relax after a hard day’s work. It would be a shame if we didn’t feel confident enough about the upcoming automatic deployment. Are you sure everything has been tested thoroughly ?