T Simple Bank API

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EBANX Software Engineer Take-home assignment

• Implement the following API in the simplest way you can.

• Durability IS NOT a requirement, that is, you don’t need to use a database or persistence mechanism.

• The main goal of this exercise is to create a common ground to conduct the interview process.

The API consists of two endpoints, GET /balance, and POST /event. Using your favorite programming language, build a system that can handle those requests, publish it on the internet, and test it using our automated test suite.

After getting green light from our test suite, please submit bellow the source code for your solution to continue the interview process.

Keep in mind that

• There is no hidden agenda, if you code passes the tests, and you are happy about it: you are done;
• Pay attention to the package/directory structure, naming and encapsulation;
• Separate your business logic from the HTTP transport layer;
• Keep your code simple, do not try to anticipate anything that is not part of the spec;
• Keep your code malleable, we may ask for modifications;
• AGAIN, Keep your code malleable, we may ask for modifications;
• Use version control, we would love to see your step-by-step process;
• Take your time, don’t rush it;

https://ipkiss.pragmazero.com/

Requirements

testScript:

--
# Reset state before starting tests

POST /reset

200 OK


--
# Get balance for non-existing account

GET /balance?account_id=1234

404 0


--
# Create account with initial balance

POST /event {"type":"deposit", "destination":"100", "amount":10}

201 {"destination": {"id":"100", "balance":10}}


--
# Deposit into existing account

POST /event {"type":"deposit", "destination":"100", "amount":10}

201 {"destination": {"id":"100", "balance":20}}


--
# Get balance for existing account

GET /balance?account_id=100

200 20

--
# Withdraw from non-existing account

POST /event {"type":"withdraw", "origin":"200", "amount":10}

404 0

--
# Withdraw from existing account

POST /event {"type":"withdraw", "origin":"100", "amount":5}

201 {"origin": {"id":"100", "balance":15}}

--
# Transfer from existing account

POST /event {"type":"transfer", "origin":"100", "amount":15, "destination":"300"}

201 {"origin": {"id":"100", "balance":0}, "destination": {"id":"300", "balance":15}}

--
# Transfer from non-existing account

POST /event {"type":"transfer", "origin":"200", "amount":15, "destination":"300"}

404 0