Invesco Senior Software Engineer Interview Questions and Answers

Q1. Tell me your project details
Ans. 
Developed a web application for online shopping with user authentication and payment gateway integration.
• Used React.js for front-end development

• Implemented user authentication using JWT tokens

• Integrated Stripe API for payment processing
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Q1. Oops concepts explained
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Q1. Optimization Techniques
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Optimization techniques are methods used to improve the efficiency and performance of software applications.
• Use of algorithms like dynamic programming and greedy algorithms

• Profiling and performance tuning to identify bottlenecks

• Code refactoring to improve readability and maintainability

• Utilizing caching and memoization for faster access to data

• Parallel processing and multi-threading for improved concurrency
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Q1. Data Structure based questions - medium level difficulty
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Q2. Another DS Algo based ques on Arrays, tree, linkedlist
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Q1. Core java based ques
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Q2. Logical questions
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Q1. Tell about yourself
Ans. 
I am a Senior Software Engineer with 8 years of experience in developing scalable and efficient software solutions.
• Experienced in full stack development using technologies like Java, Spring Boot, Angular, and SQL

• Strong background in designing and implementing RESTful APIs

• Proficient in Agile methodologies and working in cross-functional teams

• Passionate about continuous learning and staying updated with the latest techno
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Q2. Your confidence level with Java
Ans. 
Highly confident in Java with 8+ years of experience in developing complex applications
• 8+ years of experience in Java development

• Proficient in Java programming language features and best practices

• Extensive experience in developing complex applications using Java

• Familiar with Java frameworks and libraries such as Spring, Hibernate, and Apache Commons

• Comfortable with multi-threading, performance optimization, and debuggi
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Q1. Code Singleton in Java
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Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance variable of the class.

• Make the constructor private to prevent instantiation from outside the class.

• Provide a static method to get the instance, creating it if necessary.
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Q2. Code Angular Component Service
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Machine coding round, try to come up with at least one working requirement

Q1. Low level design
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Q2. Cant share the exact quesy
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Q1. High level design
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Q1. Hiring manager round
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Q1. Pagination in SQL
Ans. 
Pagination in SQL allows for displaying a subset of query results at a time.
• Use LIMIT and OFFSET clauses in SQL queries to implement pagination.

• LIMIT specifies the maximum number of rows to return.

• OFFSET specifies the number of rows to skip before starting to return rows.
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Q2. OOPS concepts.. SOILD design principles
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Q3. Thread vs task in multiprocessing.. explain with examples
Ans. 
Threads and tasks are both used in multiprocessing, but have different characteristics and use cases.
• Threads are lightweight processes within a single process, sharing memory space. They are managed by the operating system.

• Tasks are units of work that can be executed asynchronously. They are typically managed by a task scheduler.

• Threads are suitable for parallel processing and improving performance, while tasks are use...read more
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Q4. ViewBag vs Tempdata in MVC
Ans. 
ViewBag is used to pass data from controller to view, while TempData is used to pass data between controller actions.
• ViewBag is a dynamic property that allows you to pass data from controller to view

• TempData is a dictionary object that allows you to pass data between controller actions

• ViewBag is not type-safe and requires typecasting, while TempData is type-safe

• ViewBag data is lost if redirection occurs, while TempData
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Q5. Abstract vs Interface
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Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.
• Abstract classes can have constructors, fields, and non-abstract methods.

• Interfaces can only have abstract methods and constants.

• A class can implement multiple interfaces but can only inherit from one abstract class.
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