Greenway Health Assistant System Engineer Interview Questions and Answers

Python coding - To connect db and fetch data and create pipeline for ETL process

Q1. General introduction and technical question
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Q1. Basic core java questions, SQL questions
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Easy applitute question with 1 coding question at the end

Q1. String builder vs string buffer
Ans. 
String builder is faster but not thread-safe, while string buffer is slower but thread-safe.
• String builder is recommended for single-threaded applications for better performance.

• String buffer is recommended for multi-threaded applications to ensure thread safety.

• Example: StringBuilder sb = new StringBuilder(); StringBuffer sbf = new StringBuffer();
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Q2. Final keyword in oops
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The final keyword in OOP is used to restrict the user from changing the value of a variable, overriding a method, or inheriting from a class.
• Final variable: value cannot be changed once assigned

• Final method: cannot be overridden in child classes

• Final class: cannot be inherited by other classes
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Q3. Bsf graph explanation
Ans. 
BSF graph explanation
• BFS (Breadth-First Search) is a graph traversal algorithm that explores all the neighbor nodes at the present depth before moving on to the nodes at the next depth.

• It uses a queue data structure to keep track of the nodes to visit next.

• BFS is often used to find the shortest path in an unweighted graph.

• Example: BFS can be used to find the shortest path in a maze from the starting point to the exit.
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Quant, logical reasoning, mathematics

Q1. Access modifiers
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Q2. Diff between abstract class and interface Difference between array and array list Difference between method overloading and overriding Pillars of oops Deadlock Normalisation
Ans. 
Abstract class is a class with abstract methods, interface is a contract with only abstract methods. Array is fixed size, ArrayList is dynamic. Method overloading is same method with different parameters, overriding is redefining a method. OOP pillars are inheritance, encapsulation, polymorphism, abstraction. Deadlock is a situation where two or more processes are unable to proceed because each is waiting for the other...read more
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Q1. React lifecycle methods, React hooks
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Q1. RDBMS related questions asked
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Q2. SQL login building related questions
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Combination of all topics under by aptitude

Basic java questions

Advanced java questions and DSA also

Q1. I am not shortlisted one
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Basic aptitude, cloud-related questions and some data warehousing questions

Q1. Identify result of given c++ code
Ans. 
The code prints the sum of elements in an array.
• The code initializes an array of integers with values 1, 2, 3, 4, 5.

• It then calculates the sum of all elements in the array and prints it.
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Q2. DSA questions and basic questions on data engineering domain
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