NIKE Senior Software Engineer Interview Questions and Answers

The assessment consisted of an online round lasting one hour, during which there were 33 questions, all of which were challenging, including the multiple-choice questions. The questions were divided into six subsections: 1. Data Structures and Algorithms (DSA) - with a problem related to dynamic programming or recursion; 2. Java; 3. Java 8; 4. Spring; 5. Spring Boot; 6. Microservices.

DSA medium and Java Coding Questions

Frontend coding questions in Js and React js

Q1. What are Hooks and life cycle in React
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Q2. Behavioural questions like leadership etc
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Q1. Salary Expectations
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Q2. Company Values and Mission
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Q1. What is ReactQuery?
Ans. 
ReactQuery is a library for managing server state in React applications.
• Provides hooks for fetching, caching, and updating data from APIs

• Automatically handles caching, background refetching, and stale data management

• Improves performance by reducing unnecessary network requests
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Q2. Have you used useMemo, useCallback
Ans. 
Yes, I have used useMemo and useCallback in React applications.
• Used useMemo to memoize expensive calculations and prevent unnecessary re-renders.

• Used useCallback to memoize functions and prevent unnecessary re-creations.

• Example: const memoizedValue = useMemo(() => calculateValue(a, b), [a, b]);

• Example: const memoizedFunction = useCallback(() => { doSomething(a, b); }, [a, b]);
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Q1. Linked list implementation with second largest and second smallest
Ans. 
Implement a linked list with methods to find the second largest and second smallest elements.
• Create a linked list class with methods to insert elements, find second largest, and find second smallest.

• Traverse the linked list to find the largest and smallest elements, then find the second largest and second smallest.

• Handle edge cases such as empty list or lists with less than 2 elements.

• Consider using a priority queue to...read more
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Q2. Max Frequency Character in a string
Ans. 
Find the character with the highest frequency in a given string.
• Iterate through the string and count the frequency of each character using a hashmap.

• Track the character with the highest frequency as you iterate.

• Return the character with the highest frequency at the end.
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Q3. Longest common subsequence print
Ans. 
Find and print the longest common subsequence in an array of strings
• Use dynamic programming to find the longest common subsequence

• Iterate through the array of strings to find common characters

• Print the longest common subsequence found
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Q1. Solid design principles
Ans. 
Solid design principles are fundamental guidelines for designing software that is maintainable, scalable, and efficient.
• Follow the SOLID principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, Dependency Inversion)

• Use design patterns like Factory, Singleton, Observer, etc. to solve common design problems

• Keep code modular, reusable, and easy to understand

• Separate concerns and avoid ti
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Q2. Snake and Ladder LLD
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Q3. Executor Service
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Q1. Its a normal questions which usually service based company asked
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Q2. Overall it is good
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Ask you to implement any solution like caching using LRU or LFU

Its a manager round where they discuss about u=your past experiences and also they tell you about the project

Q1. I think they gave you only based on your previous offer.
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Q2. Negotiate well with them . Don't accept just for the sake of an offer because further they will not change it until/ unless it is filling position.
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2 coding questions were asked one on string to remove the nested parantheses and form string.
Second question was- I was given a mapping array and a num array
Mapping - {6,2,0,7,1,8,3,4,5,9}
NUM- {996, 25, 225}
Output- 553, 08, 008}

Q1. Callback method in java and alternatives
Ans. 
Callback method in Java allows passing a function as an argument to another function. Alternatives include using interfaces, lambda expressions, and method references.
• Callback method allows passing a function as an argument to another function

• Alternatives include using interfaces, lambda expressions, and method references

• Example: Using Runnable interface in Java to pass a function as a callback
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Q2. Hashmap vs concurrent hashmap
Ans. 
Hashmap is not thread-safe, while ConcurrentHashMap is thread-safe and allows for concurrent access.
• Hashmap is not thread-safe and can lead to race conditions in a multi-threaded environment.

• ConcurrentHashMap is thread-safe and allows for concurrent access by multiple threads without the need for external synchronization.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments, each of which can be lo...read more
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Q3. Different method to invoke methode with using constructor or variable
Ans. 
You can invoke a method using a constructor by creating an instance of the class and calling the method, or by using a variable that holds a reference to the method.
• Invoke method using constructor: ClassName obj = new ClassName(); obj.methodName();

• Invoke method using variable: ClassName obj = new ClassName(); Runnable r = obj::methodName; r.run();
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Q4. Ask many scenario based questions
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Q1. Design patterns
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Q2. IIS services questions
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Q1. How can fragments communicate among themselves
Ans. 
Fragments can communicate among themselves using interfaces, shared view models, and activity callbacks.
• Use interfaces to define communication contract between fragments

• Implement the interface in the hosting activity and pass it to the fragments

• Use shared view models to share data between fragments

• Use activity callbacks like onActivityResult() to communicate between fragments
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Find cycle in a linked list