L&T Technology Services Senior Software Developer Interview Questions and Answers

Q1. React questions
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Q2. JavaScript questions
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Q1. React questions
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Q2. JavaScript questions
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Q1. Company related questions
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Q2. Questions based on previous experience
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Q1. Microservice Architecture
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Q2. Rest api vs soap api
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REST API is lightweight, flexible, and widely used, while SOAP API is more rigid and heavy.
• REST API uses standard HTTP methods like GET, POST, PUT, DELETE, while SOAP API uses XML for communication.

• REST API is stateless and can be cached, making it faster, while SOAP API is stateful and requires more bandwidth.

• REST API is easier to implement and understand, while SOAP API has more built-in security features.

• Examples: R
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Questions from Resume, solving code snippets, DSA Algo

Q1. Explain GCD, Core Data, Higher Order Functions, ARC
Ans. 
GCD, Core Data, Higher Order Functions, ARC are key concepts in iOS development.
• GCD (Grand Central Dispatch) is a technology for managing concurrent operations.

• Core Data is a framework for managing the model layer objects in an application.

• Higher Order Functions are functions that operate on other functions, taking them as arguments or returning them.

• ARC (Automatic Reference Counting) is a memory management technology
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Q2. Weak Unowned, iOS App States
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Q1. Regarding SQL i Cleared my Test
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Q2. What is CTE ? And Write a Sample Query ?
Ans. 
CTE stands for Common Table Expressions, used to create temporary result sets within a SQL query.
• CTE is defined using the WITH keyword in SQL.

• It helps in simplifying complex queries by breaking them into smaller, more manageable parts.

• CTEs can reference themselves recursively, making them useful for hierarchical data.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;
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Q3. Print Numbers between 1 to 20 , even/odd numbers
Ans. 
Print even and odd numbers between 1 to 20.
• Iterate from 1 to 20 and check if the number is even or odd.

• Use a conditional statement to determine if the number is even or odd.

• Print the number along with its type (even or odd).
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Q1. Max of the Questions which interviewer was asked i answered well
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Q1. What is the difference between map and flat map
Ans. 
Map transforms each element of a collection, while flatMap transforms each element into a new collection and flattens the result.
• Map applies a function to each element of a collection and returns a new collection with the results

• FlatMap applies a function that returns a collection to each element of a collection, then flattens the result into a single collection

• Example: map([1, 2, 3], x => [x, x+1]) returns [[1, 2], [2...read more
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Q2. What is the difference between comparable and comparator
Ans. 
Comparable is an interface used for comparing objects, while Comparator is a separate class used for custom sorting.
• Comparable is implemented by the class whose objects need to be compared, while Comparator is a separate class used for custom sorting.

• Comparable has a single method, compareTo(), which is used to compare objects, while Comparator has a method, compare(), for custom sorting logic.

• Comparable is used for na...read more
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Q1. Interview questions based on your technology
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Q2. If database,what is procedure & function
Ans. 
Procedures and functions are stored routines in a database that can be called to perform specific tasks.
• Procedures are a set of SQL statements that perform a specific task. They can have input and output parameters.

• Functions are similar to procedures but return a value. They can be used in SQL queries like any other function.

• Both procedures and functions can improve code reusability and maintainability in a database sy
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Q3. What is trigger
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A trigger is a special kind of stored procedure that is automatically executed when certain events occur in a database.
• Triggers are used to maintain data integrity by enforcing business rules or cascading changes.

• They can be set to execute before or after INSERT, UPDATE, or DELETE operations.

• Examples include auditing changes to a table, updating related records in other tables, or enforcing constraints.
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Q4. What'sis database
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A database is a structured collection of data that is stored and accessed electronically.
• Database organizes and stores data in tables

• It allows for efficient retrieval, insertion, and updating of data

• Examples include MySQL, Oracle, MongoDB
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Q5. What is primary key?
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Primary key is a unique identifier for each record in a database table.
• Primary key ensures each record in a table is uniquely identified.

• It must have a unique value for each record.

• Primary key can be a single column or a combination of columns.

• Examples: ID column in a user table, combination of first name and last name in an employee table.
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Python core concepts and basic coding challenges

Q1. Basic java , oops
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Q2. Sql , project, behavioral
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