10+ FIS Senior Software Engineer Interview Questions and Answers

I would start by reproducing the issue, analyzing logs, checking code changes, and using debugging tools.

• Reproduce the issue to understand the exact scenario where the defect occurs.

• Analyze logs to identify any error messages or warnings related to the defect.

• Check recent code changes to see if any recent modifications could have caused the defect.

• Use debugging tools like breakpoints, logging, and profiling to trace the issue in the code.

• Collaborate with team members to brain...read more

Breaking changes can be implemented by following a structured process to minimize impact on users.

• Communicate the changes to stakeholders in advance

• Provide detailed documentation on the changes and how to adapt to them

• Implement versioning to allow users to choose when to adopt the changes

• Use feature flags to gradually roll out the changes and monitor impact

• Run thorough testing to ensure the changes do not introduce new bugs

I would analyze the impact of the defect and explore alternative solutions.

• Analyze the impact of the defect on the overall system functionality

• Discuss with the team to brainstorm alternative solutions

• Consider workarounds or temporary fixes while a permanent solution is being developed

Observables are used in RxJS to handle asynchronous operations, input/output refers to data flow, ForJoin and MergeMap are operators, interceptors are used for handling HTTP requests.

• Observables are used for handling asynchronous operations in RxJS

• Input/Output refers to the flow of data into and out of a system

• ForJoin is used to combine multiple observables into a single observable

• MergeMap is an operator used to merge observables and map their values

• Interceptors are used in A...read more

Tokens in Angular can be stored in local storage, session storage, or as cookies.

• Store tokens in local storage for persistent storage across browser sessions

• Use session storage for tokens that should be cleared when the browser is closed

• Store tokens as cookies for secure transmission over HTTPS

HashMap is a data structure that stores key-value pairs and provides fast retrieval of values based on their keys.

• HashMap is part of the Java Collections Framework.

• It allows null values and null keys.

• Keys must be unique, but values can be duplicated.

• HashMap uses hashing to store and retrieve elements efficiently.

• It provides constant-time performance for basic operations like get, put, and remove.

• Example: HashMap employeeSalaries = new HashMap<>();

Observables provide a more flexible and powerful way to handle asynchronous data streams compared to promises.

• Observables can handle multiple values over time, while promises can only handle a single value.

• Observables can be cancelled, while promises are not cancellable.

• Observables support operators for transforming, combining, and filtering data streams.

• Observables provide better error handling capabilities compared to promises.

Java 8 introduced several new features including lambda expressions, streams, and default methods.

• Lambda expressions enable functional programming in Java.

• Streams provide a new way to process collections of data.

• Default methods allow adding new methods to interfaces without breaking existing implementations.

Oops concepts are fundamental principles of object-oriented programming used for designing and implementing software.

• Encapsulation: bundling data and methods that operate on the data into a single unit

• Inheritance: creating new classes using existing classes as blueprints

• Polymorphism: ability of objects to take on multiple forms

• Abstraction: hiding the complex implementation details and showing only the necessary features