Backend Developer at Give

Hi, This is recruitment assessment. I, Krishan Kumar Yadav has completed task following the instructions given. For more details that may easy your recruitment process, Please my resume below-

Resume

Prerequisites

• Node 12.x or above
• curl

Setup instructions

• Clone the git repo
• Open project directory (senior-backend-developer-challenge) in terminal/cmd
• Run npm install.
• Run npm start.

Thats all. Great you have setup the project :) .

Test Instructions

Input (JSON)

• fromAccountId
• toAccountId
• amount
• pin (I added this only for authorization.)

Output (JSON) success case:

• newSrcBalance: The balance in the source account after the transfer
• totalDestBalance: The total balance in all accounts of destination user combined
• transferedAt: timestamp

failure case:

• errorCode
• errorMessage

Test1: Invalid request, i.e missing required params

• Run below curl command

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "10101010101",
    "toAccount": "60606060606",
    "amount": 5000
}'

Test2: Unauthorized Access i.e wrong pin for fromAccount

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "10101010101",
    "toAccount": "60606060606",
    "pin": "0000",
    "amount": 5000
}'

Test3: AccountDoesntExists Exception, i.e one of the accounts is not valid

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "10101010111",
    "toAccount": "60606060606",
    "pin": "1111",
    "amount": 5000
}'

Test4: Source and target account belongs to single user

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "10101010101",
    "toAccount": "30303030303",
    "pin": "1111",
    "amount": 5000
}'

Test5: Source account doesnt have sufficient balance

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "30303030303",
    "toAccount": "40404040404",
    "pin": "3333",
    "amount": 30000
}'

Test6: Basic saving account exceeded limit

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "40404040404",
    "toAccount": "50505050505",
    "pin": "4444",
    "amount": 30000
}'

Test6: Valid transaction

curl --location --request POST 'http://localhost:8000/send-money' \
--header 'Content-Type: application/json' \
--data-raw '{
    "fromAccount": "40404040404",
    "toAccount": "50505050505",
    "pin": "4444",
    "amount": 1000
}'

Data

I setup only 2 users having 6 accounts 1-1 each account type. All accounts are listed below-

{
    '10101010101': {
        pin: '1111',
        accountNumber: '10101010101',
        accountType: 'current',
        userId: 1,
        balance: 40000,
        transactions: []
    },
    '20202020202': {
        pin: '2222',
        balance: 20000,
        userId: 2,
        accountNumber: '20202020202',
        accountType: 'current',
        transactions: []
    },
    '30303030303': {
        pin: '3333',
        balance: 20000,
        userId: 1,
        accountNumber: '30303030303',
        accountType: 'saving',
        transactions: []
    },
    '40404040404': {
        pin: '4444',
        balance: 40000,
        userId: 2,
        accountNumber: '40404040404',
        accountType: 'saving',
        transactions: []
    },
    '50505050505': {
        pin: '5555',
        balance: 40000,
        userId: 1,
        accountNumber: '50505050505',
        accountType: 'basic_saving',
        transactions: []
    },
    '60606060606': {
        pin: '6666',
        balance: 40000,
        userId: 2,
        accountNumber: '60606060606',
        accountType: 'basic_saving',
        transactions: []
    }
}

Profile overview

• Please hit http://localhost:8000 in browser to know more about me.

Thats all. Thanks you :)