Coding challenge (Leaving company name out so that it's not searchable ;)

How to run

• to run the application

./mvnw spring-boot:run

• to run the tests

./mvnw test

Assumptions

• no concurrency controls are necessary for this implementation
• a tap can be uniquely identified by the combination of a PAN , stopId, dateTimeUTC & tap type(on or off)

Architecture, tech choice & rationales

• I chose to use spring boot because it's a fast way to bootstrap a project & there were no specific requirements to optimise for run time speed
• I think it's the best way to show how I would write enterprise backend apis, to show the use of layers to an application
• I chose to use mapstruct & lombok to speed up development time
• H2 database - if I chose to use purely in memory data structures java.util.List or java.util.Map the code that matches tap ons to tap offs would be much less readable

What I could do differently with more time

• better error handling
• a proper arg parser
• useful help text
• optimised sql queries - the date property is duplicated to simplify the query logic at the expense of efficiency
• better test coverage, more cases
• not include credentials in git - done ONLY for efficiency given the mock data