FIS Senior Software Developer Interview Questions and Answers

Q1. Communication between microservices
Ans. 
Communication between microservices is typically done through APIs, message queues, or event-driven architecture.
• Use RESTful APIs for synchronous communication between microservices

• Implement message queues like RabbitMQ or Kafka for asynchronous communication

• Utilize event-driven architecture with tools like Apache Kafka or AWS SNS/SQS

• Consider gRPC for high-performance communication between microservices
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Q2. Collectionin java
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Q1. How you will takle esculation
Ans. 
I will tackle escalations by first understanding the issue, prioritizing tasks, communicating effectively, and seeking help from senior team members if needed.
• Understand the root cause of the escalation

• Prioritize tasks based on urgency and impact

• Communicate effectively with stakeholders

• Seek help from senior team members if needed
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Q1. What is MVC and explain how it works?
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MVC stands for Model-View-Controller, a software design pattern that separates the application into three main components.
• Model: Represents the data and business logic of the application.

• View: Represents the UI components of the application.

• Controller: Acts as an intermediary between Model and View, handling user input and updating the Model accordingly.

• MVC helps in organizing code, improving maintainability, and promo...read more
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Q2. What is Index Fragmentation in SQL
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Index fragmentation in SQL occurs when the logical order of pages in an index does not match the physical order in the data file.
• Index fragmentation can lead to decreased query performance as the database engine has to scan more pages to retrieve data.

• Fragmentation can be caused by frequent insertions, deletions, or updates on the indexed columns.

• Rebuilding or reorganizing indexes can help reduce fragmentation and impr...read more
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Q3. Explain about myself
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Q1. About My Company and Project
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Q2. Asked to write SQL query to find the 2nd highest salary of an employee
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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. Http1.1 vs 2.0 vs 3.0
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HTTP/1.1 is the older version with persistent connections, HTTP/2.0 introduces multiplexing and server push, and HTTP/3.0 uses QUIC protocol for faster performance.
• HTTP/1.1 uses persistent connections for each request/response, leading to potential performance issues.

• HTTP/2.0 introduces multiplexing, allowing multiple requests/responses to be sent over a single connection simultaneously.

• HTTP/2.0 also supports server pu...read more
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Q2. Print all the possible subsets from a given slice of integers
Ans. 
Print all possible subsets from a given slice of integers
• Use recursion to generate all possible subsets

• For each element in the slice, include or exclude it in the subset

• Keep track of the current subset being generated
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Q3. Questions on GRPC implementation
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Q4. About code profiling
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Q5. What is context package in golanguage
Ans. 
Context package in Go language provides a way to pass around deadlines, cancellation signals, and other request-scoped values.
• Context package is used to manage deadlines, cancellation signals, and request-scoped values in Go programs.

• It allows passing data between function calls without having to pass them explicitly as arguments.

• Context package is commonly used in web servers to manage request-specific data and timeou...read more
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Q6. RestApi vs GRPC
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REST API is a standard protocol for web services using HTTP, while gRPC is a high-performance, open-source RPC framework.
• REST API uses HTTP for communication, making it easy to implement and widely supported.

• gRPC is a modern, high-performance RPC framework that uses HTTP/2 for transport and Protocol Buffers for serialization.

• gRPC is more efficient in terms of performance and supports features like bidirectional streami...read more
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Q1. How to copy slice element and reflect the new changes done in original slice to new slice
Ans. 
Use copy() function to create a new slice and reflect changes in original slice to the new slice.
• Use the copy() function to create a new slice with the same length as the original slice.

• Make changes to the original slice.

• The changes made to the original slice will automatically reflect in the new slice as well.
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Q2. How do you handle panic in golang
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Q3. Why golang is best compared to other languages
Ans. 
GoLang is best for its simplicity, efficiency, concurrency support, and strong community backing.
• Efficient performance due to compiled nature and garbage collection

• Concurrency support with goroutines and channels

• Strong standard library with built-in support for networking, encoding, and more

• Simple and clean syntax that promotes readability and maintainability

• Growing community and ecosystem with popular frameworks like
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Q4. Explain Kubertnetes Architecture
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Kubernetes is an open-source container orchestration platform for automating deployment, scaling, and management of containerized applications.
• Kubernetes follows a master-slave architecture with a master node controlling multiple worker nodes.

• Master node components include API server, scheduler, controller manager, and etcd.

• Worker node components include kubelet, kube-proxy, and container runtime (e.g. Docker).

• Kubernet...read more
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Q1. Project related questions, database basic questions, python basics
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