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Ventnurenox Associate Backend Engineer Hiring Test

Overview:

The aim of this assessment is to evaluate your backend skills using NodeJS and by adopting a microservice architecture. The assessment will primarily be a web app where you'll be exposing API endpoints, interacting with Database via ORM, producing and consuming event via Kafka.

Suggested Techstack:

  • NodeJS

  • ExpressJS (web server)

  • Objection JS (ORM)

  • KnexJS (Query Builder)

  • KafkaJS

Note: you may use whichever ORM or Qerybuilder you arer comfortable with.

Assissting Technology (provided in the starter code)

  • Docker Compose file for orchestrating multiple services

  • Postgres

  • Adminer

  • Kafka

Assessment:

For this assessment you will be using the following ERD. The following have 2 major tables having a single one to many relationship between them.

Task 0: Running the repo

The repo has been created in a microservice fashion using docker and docker compose. In order to run the whole repo use the following command to run all the services/containers:

docker-compose up -d --build

To stop all containers use the following command:

docker-compose down

To run a specific microservice:

docker-compose up -d --build <servicename>

Note: For every change that you make in the code, in order to rerflect those you need to re-run the container using the first command given in this section.

If you dont have docker and docker-compose setup in your system consult the following:

For Debain based linux distros:

Install docker and docker-compose using the following command in terminal:

sudo apt install docker docker-compose

For windows systems:

Install docker desktop.

For other OS:

Consult the installation guide relevant to your system on the Docker offical website.

NOTE: A service named social has already been setup with kafka for you to work in. Start working in ./backend/social/

Task 1: Checking the Sample web server code

Study the starter code for the web service provided. In which a sample web server has been created for you with a sample router/endpoint in it. You are to run the endpoint successfully via browser or Postman to check if you able to run the web app successfully.

Task 2: Creating the database using ORM/Query builder

Using the ERD provided above create the database using an ORM/Query builder. Throughout this assessment you are required to use only the ORM/Query builder to interact with the database and the tables inside of it. Add this code to the web server started code provided.

Task 3: Adding routes/endpoints

For the tables in the database you are to create separate API group(s). In each API group you will have the following category of endpoint with the described funcitonality:

  • POST - add data to the corresponding database table, data has to be passed as a raw request in JSON.
  • GET - get all data from the corresponding database table
  • GET - get specific record based on the ID of the record, this ID has to be passed as a path parameter when requesting the route/endpoint.
  • DELETE - delete specific rercord for the correspinding database table, this ID has to be passed as a path parameter when requestion the route/endpoint.
  • PATCH - alter a specific record specified by ID in the corresponding database table, this ID has to be passed as a path parameter when requesting the route/endpoint.

Task 4: Implementing Kafka consumer

Social service contains a file StreamManager.js file. This file outputs the consumed data.

For this task a Kafka server has already been setup and utility classes have been provided in order to seamlessly connect and communicate with the topics. You are to use this provided code of a consumer in order to consume messages from the a specific topic (specified in Kafka utility code), parse them and insert the consumed messaged in appropriate database tables.