Systems Technology Group Inc. Software Developer Interview Questions and Answers for Experienced

Q1. React js, ReactHooks, es67 features, bootstrap
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60mintues DSA level coding exam

Q1. Closures, hostings, react js, redux, hooks basic
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Q2. Html5, css3, basic javascript stuff
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Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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If you are a fresher , then this is for you else almost no coding test for experienced candidates.

Q1. Javascript basics, Angular react general questions depends upon profile.
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Q1. They asked general questions related to some hectic situation faced in previous company / project..
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Read apti books available in the market

Q1. All Java related questions
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Q2. Idea about AI and general HR questions
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Logical reasoning, pseudo codes, mathematical equations

Q1. Explain OOPS in java
Ans. 
OOPS in Java stands for Object-Oriented Programming System, which is a programming paradigm based on the concept of objects.
• OOPS focuses on creating objects that interact with each other to solve a problem

• It involves concepts like inheritance, encapsulation, polymorphism, and abstraction

• Java supports OOPS principles through classes and objects
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Q2. Data Structure, Basic SQL queries
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Q3. Define abstract method and abstract class
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Abstract method is a method without implementation in abstract class which cannot be instantiated. Abstract class is a class with abstract methods.
• Abstract method is declared in abstract class without implementation

• Abstract class cannot be instantiated, only used as a base for other classes

• Abstract class can have both abstract and non-abstract methods

• Example: abstract class Animal { abstract void makeSound(); }

• Example:
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Q1. Why should we hire you?
Ans. 
I have a strong technical background, excellent problem-solving skills, and a passion for software development.
• I have a Bachelor's degree in Computer Science and 5 years of experience in software development.

• I have successfully completed multiple projects using various programming languages and technologies.

• I am a quick learner and always eager to expand my knowledge and skills in the field.
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Q2. What challenges your faced in life?
Ans. 
I have faced challenges in balancing work and personal life, overcoming imposter syndrome, and adapting to new technologies.
• Balancing work and personal life: Juggling deadlines at work while making time for family and friends.

• Overcoming imposter syndrome: Feeling like I don't belong in the tech industry and constantly doubting my abilities.

• Adapting to new technologies: Learning new programming languages and tools to st
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Round duration - 135 minutes
Round difficulty - Medium

The test window was open from 2:00 p.m. to 05:30 PM IST on 28th of August 2020.We were also given a chance to take a practice test to know about working of the platform .It was a Proctored Assessment .The test platform was HackerEarth and there were around 28 MCQs, 1 programming question, and 2 SQL queries. MCQs majorly focused on OS, DBMS, C++, OOPS concepts.

Q1. 
Find All Pairs Adding Up to Target
Given an array of integers ARR of length N and an integer Target, your task is to return all pairs of elements such that they add up to the Target.
Input:
The first line ...read more
Ans. 
Find all pairs of elements in an array that add up to a given target.
• Iterate through the array and use a hashmap to store the difference between the target and current element.

• Check if the current element exists in the hashmap, if so, print the pair.

• If no pair is found, print (-1, -1).
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Round duration - 50 minutes
Round difficulty - Medium

It was basically a technical interview. It was conducted around 11:00 a.m. on 31st august 2020. There was only 1 person who was interviewing me though I expected a panel. It started off by the question regarding our college and infrastructure of it and what do I like the most about it etc. Later continued by few technical subjective questions and a code along with a basic query. Technical questions regarding data structures like linked list, Array List , HashMap were asked along with concepts like backtracking were also covered. More about technologies related to projects that I have done were asked which is machine learning. the ratings i earned in online judges were also asked about.

Q1. 
Sudoku Solver
Given a 9x9 Sudoku board, your task is to fill the empty slots and return the completed Sudoku solution.
A Sudoku is a grid composed of nine 3x3 smaller grids. The challenge is to fill in the...read more
Ans. 
Implement a Sudoku solver to fill empty slots in a 9x9 grid with numbers 1-9 satisfying constraints.
• Create a recursive function to solve the Sudoku puzzle by trying out different numbers in empty slots.

• Use backtracking to backtrack and try a different number if a conflict is encountered.

• Ensure each number appears only once per row, column, and 3x3 grid.

• Return the completed Sudoku grid as the output.
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Q2. 
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the ...read more
Ans. 
Detect if a singly linked list forms a cycle by checking if a node's next points back to a previous node.
• Traverse the linked list using two pointers, one moving one step at a time and the other moving two steps at a time.

• If the two pointers meet at any point, it indicates the presence of a cycle in the linked list.

• If one of the pointers reaches the end of the list (null), it means there is no cycle in the linked list.
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Round duration - 40 minutes
Round difficulty - Medium

It is more of a Managerial round. This was not confined to any topic or a subject .It took place around 4:15 p.m. on 31st of August ,2020.