Twilio Senior Software Engineer 1 Interview Questions and Answers

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Q1. System Design netflix or Youtube
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Q1. What is content security Policy
Ans. 
Content Security Policy (CSP) is a security standard that helps prevent cross-site scripting (XSS) attacks by allowing website owners to control which resources can be loaded on their site.
• CSP is implemented using an HTTP header that specifies approved sources of content such as scripts, stylesheets, images, fonts, and more.

• It helps protect against XSS attacks by restricting the sources from which certain types of cont...read more
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Q2. React question to have directory sturcture listing
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It was 3 hour test. Given sessions of users with timestamp and generate the group of session which falls in 10 minutes window.

Q1. There were 4 rounds. 2 System Design and 1 coding round followed by hiring manager round with behavioral questions
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Q2. Design weather Widget where you are calling an API to get hourly data
Ans. 
Design a weather widget that calls an API to get hourly data.
• Use a front-end framework like React or Angular to create the widget.

• Make API calls to a weather service like OpenWeatherMap or WeatherAPI.

• Display hourly weather data such as temperature, humidity, and precipitation.

• Include icons or graphics to represent different weather conditions.

• Allow users to input their location or automatically detect it using geolocat...read more
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Q3. Design Netflix streaming system
Ans. 
Design a scalable and efficient streaming system for Netflix.
• Use a content delivery network (CDN) to cache and deliver content closer to users.

• Implement a recommendation system to personalize content for users.

• Utilize a microservices architecture to handle different components like user authentication, video encoding, and streaming.

• Use load balancing and auto-scaling to handle varying traffic demands.

• Implement a fault-...read more
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Q4. Longest substring without repeating characters
Ans. 
Find the longest substring without repeating characters in a given string.
• Use a sliding window approach to track the longest substring without repeating characters.

• Keep track of the characters seen so far in a set to check for duplicates.

• Update the start index of the window when a duplicate character is found.

• Return the length of the longest substring.
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Q5. Tell me about a time when you had a conflict
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Q1. The usual talk about your experience and what to expect
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Take home timed coding assignment using GET and POST

Q1. 3 hour virtual onsite: easy/medium level LC, Vanilla JS, system design
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Q1. Https api design
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[1] a^2 + b^2 = x^2 , given x find a and b. Example x = 100, we have to return [6,8]
[2] rotate a square matrix by 90 degrees

Cloud integration and application integration

Medium to high level coding questions

Q1. Technical questions were asked
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Q1. Technical questions were asked
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