Cognizant Senior Software Engineer Interview Questions, Process, and Tips for Experienced

Q1. Microservice questions and cloud services.
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Aptitude test was taken for campus placements.

Q1. Question was asked about college project
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Q2. Basic of Java programming and sql
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Q1. What is oracle database architecture
Ans. 
Oracle database architecture is a set of components that work together to manage data storage and retrieval.
• Oracle database architecture consists of physical and logical structures

• Physical structures include data files, redo logs, and control files

• Logical structures include tablespaces, schema objects, and segments

• Oracle database architecture also includes background processes and memory structures

• Oracle database archi...read more
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Q2. Explain about exadata
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Exadata is an engineered system designed for running Oracle Database workloads.
• Exadata combines hardware and software components to provide high performance and scalability for Oracle Database workloads.

• It uses a combination of flash storage and disk storage to provide fast access to data.

• Exadata also includes specialized software that offloads database processing from the database server to the storage servers, improv...read more
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Q1. Printing 1 to 20 number without using any loop.
Ans. 
Use recursion to print numbers from 1 to 20 without using loops.
• Use a recursive function to print numbers from 1 to 20.

• Base case: when the number reaches 20, stop recursion.

• Each recursive call should print the current number and then call itself with the next number.
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Q2. What techniques you use to optimise your application/code
Ans. 
I use techniques like code refactoring, performance profiling, caching, and database optimization to optimize my applications.
• Code refactoring to improve code readability and maintainability

• Performance profiling to identify bottlenecks and optimize critical sections

• Caching to store frequently accessed data and reduce database queries

• Database optimization by indexing tables, optimizing queries, and reducing data redunda
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Q1. In which scenario you use documents based database over SQL based database and why ??
Ans. 
Document-based databases are preferred for unstructured data and flexible schemas, while SQL databases are better for structured data and complex queries.
• Use document-based databases for unstructured data like JSON, XML, etc.

• Document-based databases have flexible schemas, allowing for easy changes and additions to data structure.

• SQL databases are better for structured data with complex relationships and queries.

• Example...read more
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Q2. What's is uses of cache memory in application and which cache you used in your application and why ??
Ans. 
Cache memory is used to store frequently accessed data for faster retrieval, improving application performance.
• Cache memory reduces the time taken to access data by storing frequently used data closer to the processor.

• It helps in improving the overall performance of the application by reducing latency.

• Different types of cache memory include L1, L2, and L3 caches, each with varying sizes and speeds.

• In my application, we...read more
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Q3. Filter top 3 student from each class based on their marks. From 100 students list
Ans. 
Filter top 3 students from each class based on their marks from a list of 100 students.
• Sort students in each class by marks in descending order

• Select top 3 students from each class
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Q1. Question mostly related to current project and javascript
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Q2. How js engine works
Ans. 
JS engine is responsible for executing JavaScript code in a web browser.
• JS engine parses and executes JavaScript code line by line.

• It consists of a memory heap for storing variables and a call stack for managing function calls.

• JS engine uses various optimization techniques like JIT compilation to improve performance.

• Examples of popular JS engines include V8 (used in Chrome) and SpiderMonkey (used in Firefox).
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Q3. React higher order component
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Q4. Pure component in react
Ans. 
A pure component in React is a component that does not re-render unless its props have changed.
• Pure components extend React.PureComponent class

• Pure components implement shouldComponentUpdate method to compare props and state for changes

• Pure components are useful for optimizing performance by preventing unnecessary re-renders
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Q1. Angular architecture and it's components
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Angular architecture and its components
• Angular follows a component-based architecture

• Components are the building blocks of Angular applications

• Each component has a template, class, and metadata

• Modules are used to organize components and services

• Services are used for sharing data and functionality between components

• Directives are used to add behavior to elements in the DOM

• Pipes are used for data transformation

• RxJS is us...read more
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Q1. Core Java Basics + JAVA-8 functionalities
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Q2. Collection + Threads + basic SQL Queries
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Q1. Job location requirement
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