I applied through another source. The process took about a month. First, I got a call from a very nice recruiter. Then, they assigned me a take-home project, which I did, including code, tests, a Docker image, and a README file. After a week, I received an email stating that I don't have the skills for Nubank.

Code Challenge — Authorizer. You are tasked with implementing an application that authorizes a transaction for a specific account following a set of predefined rules.

Sample usage:

$ cat operations { "account": { "activeCard": true, "availableLimit": 100 } } { "transaction": { "merchant": "Burger King", "amount": 20, "time": "2019-02-13T10:00:00.000Z" } } { "transaction": { "merchant": "Habbib's", "amount": 90, "time": "2019-02-13T11:00:00.000Z" } }

$ authorize < operations { "account": { "activeCard": true, "availableLimit": 100 }, "violations": [] } { "account": { "activeCard": true, "availableLimit": 80 }, "violations": [] } { "account": { "activeCard": true, "availableLimit": 80 }, "violations": [ "insufficient-limit" ] }