FIS Senior Software Engineer Interview Questions and Answers

MCQ type questions related to Front end, Back end and involved few coding questions in the MCQ format

Q1. How would you debug an application to solve a production defect that was raised?
Ans. 
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 th...read more
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Q2. What would you do if a defect can't be fixed?
Ans. 
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
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Q3. How would you implement breaking changes in the application?
Ans. 
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...read more
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Q1. Asked Angular related Questions
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Q2. Observables Input Output ForJoin MergeMap Interceptors
Ans. 
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 ...read more
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Q3. Why Observables over promise
Ans. 
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 t...read more
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Q4. Behavior Subject vs SUbject
Ans. 
Behavior Subject is a type of Subject in RxJS used for emitting values and managing subscriptions.
• Behavior Subject is a type of Subject in RxJS.

• It emits the most recent value to new subscribers.

• It retains the last emitted value and emits it immediately upon subscription.

• Example: const subject = new BehaviorSubject(0);
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Q5. Where to store token in angular
Ans. 
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
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Q1. 1. Implement a linked list 2. Java 8 stream questions
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Q2. Java streams questions & convert to list map etc
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Q1. 1. questions on microservices & AWS
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Q1. Oops concepts and implementation
Ans. 
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 feature...read more
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