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Backend Engineer Interview Questions
14,381 backend engineer interview questions shared by candidates
Coding questions, no references allowed, no built in library functions allowed.
From DS & Algorithm and Design
Did you have the experience to deal with Support or troubleshoot a production issue? If yes, kindly elaborate it
1) Coding question in a lang of your desire, here it is: Given the following class (JAVA): class Role { String title, LocalDate effectiveFrom } You need to calculate what role an employee had per a given set of dates, can be multiple roles of course. Need to implement the following function: Map rolesByDates(List history, List dates) Note that the history list is sorted by the effectiveFrom property in descending order. Here's the main function: public static void main(String[] args) { List history = Arrays.asList( new Role("Team Leader", LocalDate.of(2020, 8, 1)), new Role("Fullstack developer", LocalDate.of(2016, 5, 15)), new Role("Frontend developer", LocalDate.of(2015, 11, 17)) ); List dates = Arrays.asList( LocalDate.of(2021, 1, 1), LocalDate.of(2014, 1, 1), LocalDate.of(2016, 6, 1) ); Map rolesByDates = rolesByDates(history, dates); rolesByDates.forEach((key, value) -> System.out.println("date = " + key + ", role = " + value.getTitle())); } 2) Given a system that generates surveys (similar to google forms), need to represent its data in high level, like technical design on how to implement such data structure, only data. 3) Differences between SQL / NO-SQL, an easy question on sql syntax, related to the previous question and on which db it will be better to represent it.
Asking about the automation of ec2 instances
What is Mutex? How to implement one?
How to handle failures when processing a message coming from a queue (say SQS, RabbitMQ, etc.)?
About my one achievement that i am proud of in my professional career
Simple asynchronous programming
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