BitGo Senior Software Engineer Interview Questions and Answers for Experienced

Q1. What is hibernate transaction?
Ans. 
Hibernate transaction is a way to manage database transactions in Hibernate framework.
• Hibernate transaction allows grouping multiple database operations into a single unit of work.

• It ensures data consistency and integrity by either committing all changes or rolling back in case of failure.

• Transactions in Hibernate are managed using Session interface.

• Example: session.beginTransaction(); session.save(entity); session.get
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Q2. How to handle million of data which need to be save in the DB?
Ans. 
Use efficient database design, indexing, partitioning, and caching to handle large amounts of data.
• Optimize database schema for efficient storage and retrieval.

• Implement indexing on frequently queried columns to speed up search operations.

• Partition data to distribute load across multiple servers or disks.

• Utilize caching mechanisms like Redis or Memcached to reduce database load.

• Consider using sharding to horizontally s...read more
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They give a standard application to develop in mvvm or clean architecture, don't forget to write unit tests

Q1. Mostly discuss on the implementation of the project you've done in round one
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Q2. Flutter is addon
Ans. 
Flutter is a UI toolkit for building natively compiled applications for mobile, web, and desktop from a single codebase.
• Flutter is an open-source framework developed by Google.

• It uses the Dart programming language.

• Flutter allows for hot reload, which enables developers to see changes instantly.

• It provides a rich set of pre-built widgets for building user interfaces.

• Flutter can be used to create apps for iOS, Android, w
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Q3. Explain about compose way of thinking.
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Compose way of thinking involves breaking down complex problems into smaller, manageable parts and then combining them to create a solution.
• Break down a problem into smaller components

• Solve each component individually

• Combine the solutions to create a complete solution

• Example: Using functions to break down a complex task into smaller functions and then combining them to achieve the desired outcome
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Q4. Difference between presenter and viewmodel
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Q5. Explain about lifecycle of view
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Lifecycle of view refers to the stages a view goes through from creation to destruction in an application.
• Creation: View is initialized and loaded into memory.

• Layout: View is positioned and sized on the screen.

• Display: View is rendered and displayed to the user.

• Interaction: User interacts with the view through input events.

• Destruction: View is removed from memory when no longer needed.
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Q1. About prev project experience
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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 are indexes in the database? what is the difference between clustered and non-clustered indexes?
Ans. 
Indexes are used to improve database performance. Clustered indexes determine the physical order of data, while non-clustered indexes do not.
• Indexes are used to speed up data retrieval operations in a database.

• Clustered indexes determine the physical order of data in a table, while non-clustered indexes do not.

• A table can have only one clustered index, but multiple non-clustered indexes.

• Clustered indexes are generally ...read more
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Q2. Write a query to delete duplicate rows from a table.
Ans. 
Query to delete duplicate rows from a table
• Use GROUP BY clause to group the rows by their unique values

• Use HAVING clause to filter out the groups with count greater than 1

• Use DELETE statement to delete the duplicate rows
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Q3. Class A { public string A() { return "hello"; } } what is wrong with above code?
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Q4. What is a singleton pattern and how to implement it?
Ans. 
Singleton pattern restricts the instantiation of a class to a single instance and provides a global point of access to it.
• Create a private constructor to restrict instantiation of the class

• Create a private static instance of the class

• Create a public static method to access the instance

• Ensure thread safety if necessary

• Examples: Database connection, Logger, Configuration settings
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Q5. How do you handle exceptions in stored procedures?
Ans. 
Handle exceptions in stored procedures by using TRY-CATCH blocks.
• Use TRY-CATCH blocks to catch and handle exceptions

• Log the error message and severity level

• Rollback the transaction if necessary

• Rethrow the error if it cannot be handled

• Use RAISERROR to raise custom error messages
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Q6. Explain SOLID principles.
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SOLID principles are a set of five design principles that help in creating maintainable and scalable software.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segregation Principle: C...read more
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Q7. Difference between throw and throw exception?
Ans. 
throw is used to throw an exception while throw exception is used to throw a specific exception.
• throw is used to throw any type of exception while throw exception is used to throw a specific type of exception.

• throw exception is followed by the type of exception that needs to be thrown.

• throw can be used to throw any object while throw exception can only be used to throw an exception object.

• Example: throw new Exception("
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Q1. Angular concepts like : Interpolation, services, directives, pipes
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Q2. Observables, promises, components
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Q1. Extension methods in C#
Ans. 
Extension methods allow adding functionality to existing types without modifying them.
• Extension methods are defined in a static class.

• They must be marked with the 'this' keyword before the first parameter.

• They can be called on instances of the extended type as if they were instance methods.

• Extension methods can be used to add functionality to third-party or built-in types.

• Example: 'myString.Reverse()' where 'Reverse' i
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Q2. When an int is declare with 0 value and passed as an out parameter to a method what will be the output
Ans. 
The output will depend on the implementation of the method.
• The method may or may not modify the value of the int parameter.

• The method may or may not return a value based on the int parameter.

• Without knowing the implementation of the method, it is impossible to predict the output.
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Q3. How do you inherit a partial class
Ans. 
To inherit a partial class, use the 'partial' keyword in both the base and derived classes.
• Use the 'partial' keyword in both the base and derived classes

• Ensure that the partial classes have the same name and are in the same namespace

• Add the necessary code to the derived class to inherit the properties and methods from the base class
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Q4. What is "using" keyword
Ans. 
The 'using' keyword is used in C# to declare a code block that uses an object and automatically disposes of it when done.
• The 'using' keyword is followed by a set of parentheses that contain the object to be used.

• The object must implement the IDisposable interface.

• The 'using' block ensures that the object is disposed of when the block is exited, even if an exception is thrown.

• Example: using (FileStream fileStream = new ...read more
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Q5. Tools in visual studio for memory management, rectify unused variable and unnecessary code
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Q6. Why do we need WebAPIs
Ans. 
WebAPIs allow communication between different systems and enable access to data and functionality over the internet.
• WebAPIs provide a standardized way for different systems to communicate with each other over the internet.

• They allow access to data and functionality from remote servers, enabling the creation of web and mobile applications.

• WebAPIs can be used to integrate different systems, such as payment gateways, soci...read more
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Q7. Can DML statements be written in functions
Ans. 
Yes, DML statements can be written in functions.
• Functions can contain DML statements like INSERT, UPDATE, DELETE.

• Functions can also return values based on the DML statements executed.

• However, functions cannot be used to execute DDL statements like CREATE or ALTER.
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Q8. What are triggers in sql
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Triggers in SQL are special types of stored procedures that are automatically executed in response to certain events.
• Triggers can be used to enforce business rules or data integrity

• They can be executed before or after an INSERT, UPDATE, or DELETE statement

• Triggers can also be used to audit changes to data

• Examples of triggers include sending an email notification when a new record is inserted or updating a related table
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Q9. How to you fetch a record from table
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To fetch a record from a table, use SELECT statement with appropriate conditions.
• Use SELECT statement with appropriate columns and table name

• Add conditions using WHERE clause to filter the record

• Use LIMIT clause to limit the number of records returned

• Example: SELECT * FROM users WHERE id = 1 LIMIT 1
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Q10. Inbuilt methods that follow overriding
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Inbuilt methods that follow overriding
• In Java, methods that can be overridden are marked with the 'override' keyword

• The overridden method must have the same name, return type, and parameters as the original method

• The 'super' keyword can be used to call the overridden method from the subclass

• Overriding can be used to provide a different implementation of a method in a subclass
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Q1. Your aspirations and reason for job change.
Ans. 
Seeking new challenges and opportunities for growth in a dynamic environment.
• Looking to expand my skill set and take on more responsibilities

• Interested in working on cutting-edge technologies and projects

• Seeking a company culture that values innovation and collaboration
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