Morningstar Senior Scientific Officer Interview Questions, Process, and Tips

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Q1. Core Java, Spring Boot, AWS
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Q2. What is DI and IoC, RestTemplate, Design patterns
Ans. 
DI and IoC are design principles in software development. RestTemplate is a class for making HTTP requests. Design patterns are reusable solutions to common problems.
• DI (Dependency Injection) is a design pattern where objects are passed their dependencies rather than creating them internally.

• IoC (Inversion of Control) is a design principle where the control of object creation and lifecycle is inverted to a container or...read more
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Q3. SQL vs NoSQL, Working of Keys in DynamoDB
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SQL is relational database, NoSQL is non-relational. DynamoDB uses primary keys for data retrieval.
• SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL databases use structured query language for defining and manipulating data, while NoSQL databases use various data models like document, key-value, graph, etc.

• In DynamoDB, keys are used for data retrieval. Primar...read more
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Q4. How hashmap works
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HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• HashMap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys hash to the same index, which is resolved using techniques like chaining or open addressing.

• HashMap in Java is a popular implementation that provides constant-time complexity for basic operations like get and
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Q5. Circuit Breaker design pattern
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Circuit Breaker design pattern is used to prevent a system from repeatedly trying to execute an operation that is likely to fail.
• Circuit Breaker pattern is used to handle faults in distributed systems by providing a way to fail fast and prevent cascading failures.

• It monitors the number of failures and once a threshold is reached, it opens the circuit and stops executing the operation.

• After a certain period of time, the...read more
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