Travelex Senior Software Engineer Interview Questions and Answers

Q1. What is dependency injection
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing mock dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.
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Q2. What is state in react
Ans. 
State in React is a JavaScript object that stores data and determines how a component renders and behaves.
• State is mutable and can be updated using the setState() method

• State should be used for data that will change over time and affect the component's rendering

• State should not be modified directly, use setState() instead
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Q1. Tell me your project details
Ans. 
Developed a web application for online shopping with user authentication and payment gateway integration.
• Used React.js for front-end development

• Implemented user authentication using JWT tokens

• Integrated Stripe API for payment processing
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Q1. Oops concepts explained
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Q1. Optimization Techniques
Ans. 
Optimization techniques are methods used to improve the efficiency and performance of software applications.
• Use of algorithms like dynamic programming and greedy algorithms

• Profiling and performance tuning to identify bottlenecks

• Code refactoring to improve readability and maintainability

• Utilizing caching and memoization for faster access to data

• Parallel processing and multi-threading for improved concurrency
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Q1. Data Structure based questions - medium level difficulty
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Q2. Another DS Algo based ques on Arrays, tree, linkedlist
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Q1. Core java based ques
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Q2. Logical questions
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Q1. Code Singleton in Java
Ans. 
Singleton pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance variable of the class.

• Make the constructor private to prevent instantiation from outside the class.

• Provide a static method to get the instance, creating it if necessary.
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Q2. Code Angular Component Service
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Q1. Asp net core, c#, angular ,SQL server
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Q1. Asp.net, angular , c#
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Q1. Logical questions, general discussion about your projects
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Q2. Challeges, real-time scenarios
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Q1. Family background, CTC discussion
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Q2. Company profile and norms
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Machine coding round, try to come up with at least one working requirement

Q1. Low level design
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Q2. Cant share the exact quesy
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Q1. High level design
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Q1. Hiring manager round
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