Harness Senior Software Engineer 1 Interview Questions and Answers

Q1. Describe Life cycle in react
Ans. 
React has three main phases in its lifecycle: mounting, updating, and unmounting.
• Mounting: when a component is created and inserted into the DOM

• Updating: when a component is updated due to changes in props or state

• Unmounting: when a component is removed from the DOM

• Lifecycle methods can be used to perform actions at each phase, such as componentDidMount() or componentWillUnmount()

• React also has error handling methods,
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Q2. Explain strict mode in javascript and it's use
Ans. 
Strict mode is a way to write secure and optimized JavaScript code.
• Enables catching of silent errors

• Disallows duplicate property names or parameters

• Prevents use of undeclared variables

• Makes `eval()` safer to use

• Throws errors on invalid usage of `this` keyword
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CURD operations along with implementation of a mock UI

Round duration - 120 minutes
Round difficulty - Hard

This round was very difficult. I never do these much difficulty level of coding questions. But i give my best, and just do every questions by using step by step process.

Q1. 
Hourglass Pattern Problem Statement
Given an integer 'N', print an hourglass pattern based on the value of 'N'.
Input:
The first and only line of input contains an integer, denoting the value of N.
Out...read more
Ans. 
Print an hourglass pattern based on the given integer 'N'.
• Read the integer 'N' as input

• Print the top half of the hourglass pattern with decreasing numbers

• Print the bottom half of the hourglass pattern with increasing numbers

• Handle the constraints for 'N' values between 1 and 50
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Q2. 
BFS Traversal in a Graph
Given an undirected and disconnected graph G(V, E) where V vertices are numbered from 0 to V-1, and E represents edges, your task is to output the BFS traversal starting from the ...read more
Ans. 
BFS traversal in a disconnected graph starting from vertex 0.
• Use BFS algorithm to traverse the graph starting from vertex 0.

• Explore neighbor nodes first before moving to the next level neighbors.

• Consider bidirectional edges in an undirected graph.

• Output the BFS traversal sequence for each test case in a separate line.

• Ensure the BFS path starts from vertex 0 and print connected nodes in numerical sort order.
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Q3. 
Sort a Stack Problem Statement
You are given a stack. Your task is to sort the elements within the stack in ascending order using only push and pop operations. You are allowed to use one additional stack ...read more
Ans. 
Sort a given stack in ascending order using only push and pop operations with the help of an additional stack.
• Use one additional stack to assist in sorting the elements.

• Pop elements from the input stack and push them onto the auxiliary stack in sorted order.

• Keep track of the current minimum element to maintain ascending order.

• Pop elements from the auxiliary stack back to the input stack to get the sorted order.
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Round duration - 90 minutes
Round difficulty - Easy

This round is also coding round in this round we have a small video call interaction too, in which hr ask few questions to only those whose coding question is correct.

Q1. 
Next Smaller Palindrome Problem Statement
You are given a palindrome number represented as a string S. Your task is to find the largest palindrome number that is strictly less than S.
Example:
Input:
T...read more
Ans. 
Find the largest palindrome number strictly less than a given palindrome number.
• Iterate from the middle towards the start of the number and decrement the digits to create the largest palindrome less than the given number.

• Handle cases where the number is all '9's by changing the middle digit to '9' and decrementing the rest of the digits.

• If the number has an odd length, simply mirror the first half to create the largest
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Q2. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
Ans. 
Find minimum time to rot all fresh oranges adjacent to rotten oranges in a grid.
• Use Breadth First Search (BFS) to simulate the rotting process.

• Track the time taken to rot all fresh oranges.

• Return -1 if all fresh oranges cannot be rotten.

• Handle edge cases like empty grid or no fresh oranges.
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Create an API using Notepad to check if a string is a palindrome or not.

Q1. Solid principal
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Q1. Basics Oops concepts and SQL queries along with currently working projects stacks
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Q1. More in-depth technical questions use of reflections etc
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Q1. Usual HR interviews company values etc
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Q1. Oops? .net core features
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Q1. How do you measure success at work?
Ans. 
Success at work is measured by achieving goals, delivering high-quality work, and receiving recognition.
• Achieving goals set by the team or organization

• Delivering high-quality work that meets or exceeds expectations

• Receiving recognition from colleagues, managers, or clients

• Meeting deadlines and completing tasks efficiently

• Contributing to the overall success of the team or project
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Q2. How many programming languages do you know?
Ans. 
I know multiple programming languages.
• I am proficient in Java, Python, and C++.

• I have experience with web development languages such as HTML, CSS, and JavaScript.

• I am familiar with scripting languages like Bash and PowerShell.

• I have worked with database query languages like SQL.

• I have knowledge of mobile app development languages like Swift and Kotlin.
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Q1. Regarding BMS and system engineering activities
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Q2. System engineer process and tools
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Q1. System engineer role and responsibilities
Ans. 
System engineers design and manage complex systems to ensure they operate efficiently and effectively.
• Designing and implementing computer systems

• Managing system configurations and upgrades

• Troubleshooting system issues

• Collaborating with other IT professionals

• Ensuring system security and data integrity
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Q2. System engineer activity wrt BMS
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Q1. Salary related stuff and expectations
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Q2. Details regarding joining date and last working day
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Q1. Previous project and role?
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Q2. What is KWP2000 or UDS use for?
Ans. 
KWP2000 and UDS are communication protocols used in automotive diagnostics.
• KWP2000 is used for diagnostics and flashing of electronic control units (ECUs) in older vehicles.

• UDS (Unified Diagnostic Services) is a modern protocol used for diagnostics and flashing of ECUs in newer vehicles.

• Both protocols allow for communication between a diagnostic tool and the vehicle's ECUs to read and clear fault codes, perform tests, ...read more
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Q3. How many type of ECU are there?
Ans. 
There are mainly three types of ECUs: Engine Control Unit (ECU), Transmission Control Unit (TCU), and Body Control Module (BCM).
• Engine Control Unit (ECU) - controls the engine functions such as fuel injection, ignition timing, and emissions.

• Transmission Control Unit (TCU) - manages the transmission system, including gear shifting and torque converter lockup.

• Body Control Module (BCM) - oversees various body functions li...read more
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Q4. What is online and offline in CANoe?
Ans. 
Online and offline in CANoe refer to the modes of communication with the CAN bus.
• Online mode allows real-time interaction with the CAN bus, sending and receiving messages.

• Offline mode allows analysis of previously recorded CAN bus data without real-time interaction.

• Online mode is used for testing and debugging live systems, while offline mode is used for post-analysis and simulation.

• Examples: Online mode is used to mon...read more
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Q1. Same as round one question?
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Q1. Salary expectations?
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