Westpac Senior Software Engineer Interview Questions and Answers

Q1. Group id in kafka consumer configuration
Ans. 
Group id is a unique identifier for a group of consumers in Kafka consumer configuration.
• Group id helps in coordinating the consumption of messages among multiple consumers in a consumer group.

• Each consumer group should have a unique group id to ensure proper message distribution.

• Changing the group id will result in the consumer group starting consumption from the beginning of the topic.

• Group id is specified in the con...read more
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Q2. Recursive algorithm for multiplying 2 numbers
Ans. 
Recursive algorithm for multiplying 2 numbers
• Define a base case for when one of the numbers is 0

• Use recursion to repeatedly add the second number to the result until the first number reaches 0

• Consider handling negative numbers and optimizing for efficiency
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Q3. Spring filters implementation
Ans. 
Spring filters are used to intercept HTTP requests and responses in a Spring application.
• Spring filters can be used for logging, authentication, authorization, etc.

• They are implemented using the javax.servlet.Filter interface.

• Filters can be configured in the web.xml file or using annotations like @WebFilter.

• Example: Implementing a logging filter to log incoming requests and outgoing responses.
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Q4. SQL query for first 5 biggest salaries
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SQL query to retrieve the first 5 biggest salaries from a table
• Use the ORDER BY clause to sort salaries in descending order

• Use the LIMIT clause to limit the results to the first 5 rows
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Q1. Write a program to check numer is palindrom or not.
Ans. 
Program to check if a number is a palindrome or not.
• Convert the number to a string to easily check for palindrome

• Reverse the string and compare it with the original string

• If they are the same, the number is a palindrome
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Q2. What is the functionality of Lambda Expression in Java.
Ans. 
Lambda expressions in Java are used to provide a concise way to represent anonymous functions.
• Lambda expressions are used to define inline implementation of a functional interface.

• They enable you to pass functionality as an argument to a method.

• Lambda expressions are made up of parameters, an arrow, and a body.

• Example: (a, b) -> a + b
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Q3. How to call default method of interface if class implemented multiple interfaces.
Ans. 
To call a default method of an interface when a class implements multiple interfaces, use the interface name followed by the method name.
• Use InterfaceName.super.methodName() to call the default method of a specific interface.

• If a class implements multiple interfaces with default methods of the same name, you must specify the interface name to call the desired method.

• Example: Interface1.super.defaultMethod() to call the
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Q1. Lots of technical questions but the interview was not technical..
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Q2. What is JIT compiler
Ans. 
JIT compiler stands for Just-In-Time compiler, which compiles code during runtime instead of ahead of time.
• JIT compiler improves performance by compiling code on the fly as it is needed

• It converts bytecode into native machine code for execution

• Examples include Java HotSpot JIT compiler and .NET JIT compiler
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Q3. What are futures
Ans. 
Futures are financial contracts that obligate the buyer to purchase an asset or the seller to sell an asset at a predetermined future date and price.
• Futures are standardized contracts traded on exchanges, where the buyer agrees to purchase an asset at a future date for a price agreed upon today.

• They are commonly used in commodities, currencies, and financial instruments trading.

• Futures allow investors to hedge against ...read more
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Q4. What is GC and what types we have
Ans. 
GC stands for Garbage Collection, a process in programming languages where unused memory is automatically reclaimed.
• Types of GC include: Mark and Sweep, Reference Counting, Generational, and Incremental.

• Mark and Sweep: Identifies and removes unreachable objects.

• Reference Counting: Keeps track of the number of references to an object and deletes it when the count reaches zero.

• Generational: Divides objects into different...read more
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Q5. Walk me through a trading process
Ans. 
A trading process involves buying and selling financial instruments in the market.
• Research and analysis of market trends and opportunities

• Placing buy or sell orders through a trading platform

• Monitoring and managing open positions

• Executing trades based on predetermined strategies

• Recording and analyzing trade data for performance evaluation
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Q1. Difference between ref and out
Ans. 
ref is used for passing a variable by reference, out is used for returning a variable by reference
• ref is used for passing a variable by reference, allowing the method to modify the variable

• out is used for returning a variable by reference, typically used for returning multiple values from a method

• Example: int x = 10; SomeMethod(ref x); // x can be modified inside SomeMethod

• Example: int result; SomeMethod(out result); /
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Q2. Ref needs to be initialized before passing and will change, out no need to be initialized and
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Duration : 1 hours
Question type : Greedy algo question(DSA)
Platform : of any choice

Q1. LLDs Designing on any system
Ans. 
LLDs are detailed design documents that describe the software architecture of a system.
• LLDs typically include detailed information on modules, components, interfaces, and data for a system.

• They help in understanding how different parts of the system interact and communicate with each other.

• Examples of LLDs include class diagrams, sequence diagrams, and data flow diagrams.

• LLDs are crucial for developers to implement the
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Q1. Coding plus behavioral plus LLD
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Q1. Basics of java script
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General knowledge and development skills and new things..

Q1. What are your roles in your current organization
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Q2. How Micro-frontends work.
Ans. 
Micro-frontends are a technique for breaking down a large frontend application into smaller, more manageable parts.
• Each micro-frontend is a self-contained module that can be developed and deployed independently.

• They communicate with each other through APIs or events.

• Micro-frontends can be written in different languages and frameworks.

• They can be combined to form a cohesive user interface.

• Examples of companies using mic
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