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Photon Interactive Interview Questions and Answers
76 Interview questions
Promises are objects in JavaScript that represent the eventual completion or failure of an asynchronous operation.
A Promise can be in one of three states: pending, fulfilled, or rejected.
You create a Promise using the 'new Promise' constructor.
Example: const myPromise = new Promise((resolve, reject) => { /* async code */ });
You handle the result of a Promise using '.then()' for success and '.catch()' for errors...
The Event Loop is a programming construct that manages asynchronous operations in JavaScript, enabling non-blocking execution.
The Event Loop allows JavaScript to perform non-blocking I/O operations despite being single-threaded.
It works by continuously checking the call stack and the message queue.
When the call stack is empty, the Event Loop pushes the first message from the queue to the stack for execution.
Exampl...
Async and Await are keywords in programming that simplify asynchronous code, making it easier to read and maintain.
Async functions return a promise, allowing for non-blocking operations.
Await pauses the execution of an async function until the promise is resolved.
Example: async function fetchData() { const data = await fetch(url); }
Using async/await improves code readability compared to traditional promise chainin...
Implementing effective recruitment strategies enhances talent acquisition and aligns candidates with organizational goals.
Utilize social media platforms for job postings and employer branding, e.g., LinkedIn, Facebook.
Implement an employee referral program to leverage existing employees' networks.
Conduct targeted outreach to universities and colleges for internships and entry-level positions.
Use data analytics to ...
Node.js is a JavaScript runtime built on Chrome's V8 engine, enabling server-side scripting and asynchronous event-driven architecture.
Node.js uses an event-driven, non-blocking I/O model, making it efficient and suitable for I/O-heavy applications.
It allows developers to use JavaScript on both the client and server sides, promoting code reuse.
Node.js has a rich ecosystem of libraries and frameworks, such as Expre...
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
Virtual DOM is a concept used in frameworks like React to improve performance by minimizing actual DOM manipulations.
Changes made to the virtual DOM are compared with the actual DOM, and only the differences are updated.
This process helps in reducing the number of updates needed and improves the ...
Map and filter are higher-order functions in JavaScript used to manipulate arrays.
Map: Transforms each element in an array and returns a new array with the transformed elements.
Example: [1, 2, 3].map(num => num * 2) => [2, 4, 6]
Filter: Creates a new array with elements that pass a certain condition.
Example: [1, 2, 3, 4].filter(num => num % 2 === 0) => [2, 4]
Redux is a predictable state container for JavaScript apps.
Used for managing the state of an application in a predictable way
Helps in maintaining a single source of truth for the state
Facilitates state management in complex applications by providing a centralized store
Works well with React to manage the state of components
The box model is a concept in web design that describes how elements are structured with content, padding, borders, and margins.
The box model consists of content, padding, border, and margin.
Content is the actual content of the element, such as text or images.
Padding is the space between the content and the border.
Border is the line that surrounds the padding and content.
Margin is the space outside the border, sep...
Routing is the process of selecting a path for network traffic to travel from one point to another.
Routing determines the best path for data packets to travel
It involves making decisions based on network protocols and algorithms
Examples include IP routing in the internet and routing tables in networking devices
Photon Interactive Interview Experiences
117 interviews found
Anonymous
Selected
Java oops concepts
collections
spring framework
(1 Question)
- Q1. About project performance improvement of application db performance issues
Interview Preparation Tips
if you are in project safe (all projects are 3-4 months) else you will be fired without giving notice period (ie. immediate ). they don't have capability to maintain bench resources. simply running a company. Apart from me nearly 20 candidates are resigned . they forced to put papers.
One of the colleague (6-7 years in Photon) for her also not given any notice period. Asked her to leave immediately. So you can understand how bad this company is.
(2 Questions)
- Q1. Difference between default and props
- Ans.
Default values are set in a component, while props are passed from parent components to child components in React.
Default values are defined using defaultProps in a component.
Props are passed to components as attributes when they are instantiated.
Example of default: MyComponent.defaultProps = { name: 'Guest' };
Example of props: <MyComponent name='John' /> passes 'John' as a prop.
- Q2. How do you know the dom is ready or not
- Ans.
The DOM is ready when the HTML document is fully loaded and parsed, allowing scripts to manipulate it safely.
Use the 'DOMContentLoaded' event: This event fires when the initial HTML document has been completely loaded and parsed.
Example: document.addEventListener('DOMContentLoaded', function() { /* code here */ });
Check if 'document.readyState' is 'complete': This indicates that the document and all resources are fully...
Interview Preparation Tips
Skills evaluated in this interview
Salman Shaik
(2 Questions)
- Q1. Can you introduce yourself?
- Q2. What is your experience with implementing lazy loading?
- Ans.
Implemented lazy loading in web applications to improve performance by loading content only when needed.
Implemented lazy loading for images on a website to reduce initial page load time.
Utilized libraries like Intersection Observer to trigger loading of elements when they come into view.
Implemented lazy loading for components in a single page application to improve user experience.
(1 Question)
- Q1. What challenges did you face during the project?
I applied via LinkedIn and was interviewed in Nov 2024. There was 1 interview round.
Created an app which take data from API service and show in a list using jetpack compose
Selected
I appeared for an interview in May 2025, where I was asked the following questions.
- Q1. Core Java, Microservices, GCP cloud, kafka related questions
- Q2. Java 8, 11
Rumpa Pandey
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. What type of HR strategy do you use in your recruitment process?
- Q2. What strategies can be implemented for effective recruitment?
- Ans.
Implementing effective recruitment strategies enhances talent acquisition and aligns candidates with organizational goals.
Utilize social media platforms for job postings and employer branding, e.g., LinkedIn, Facebook.
Implement an employee referral program to leverage existing employees' networks.
Conduct targeted outreach to universities and colleges for internships and entry-level positions.
Use data analytics to asses...
Interview Preparation Tips
Santosh Parakh
I appeared for an interview in Mar 2025, where I was asked the following questions.
- Q1. L1 round, given a task related to string which I was supposed to completed in an hour HR was there in the call monitoring me throughout
- Q2. I submitted my code and waiting for another round
Interview Preparation Tips
(2 Questions)
- Q1. How do you approach design for accessibility?
- Ans.
I approach design for accessibility by considering various user needs and ensuring the interface is usable for all individuals.
Conducting research to understand the diverse needs of users
Implementing features such as alt text for images and proper color contrast
Testing the design with assistive technologies like screen readers
Providing multiple ways to navigate the interface for different abilities
- Q2. How do you balance astestics and functionality in design?
- Ans.
Balancing aesthetics and functionality in design involves prioritizing user experience while maintaining visual appeal.
Understand the target audience and their needs
Focus on usability and intuitive navigation
Use visual hierarchy to guide users' attention
Simplify complex information for better comprehension
Test designs with real users for feedback and improvements
I applied via Naukri.com and was interviewed in Jul 2024. There was 1 interview round.
(3 Questions)
- Q1. Explain how do you handle large data processing in Pyspark
- Ans.
Large data processing in Pyspark involves partitioning, caching, and optimizing transformations for efficient processing.
Partitioning data to distribute workload evenly across nodes
Caching intermediate results to avoid recomputation
Optimizing transformations to minimize shuffling and reduce data movement
- Q2. Explain how do you implement data governance in your company
- Ans.
Data governance is implemented through policies, processes, and tools to ensure data quality, security, and compliance.
Establish data governance policies and procedures to define roles, responsibilities, and processes for managing data
Implement data quality controls to ensure accuracy, completeness, and consistency of data
Utilize data security measures such as encryption, access controls, and monitoring to protect sens...
- Q3. Name any 2 data lineage tools
- Ans.
Two data lineage tools are Apache Atlas and Informatica Enterprise Data Catalog.
Apache Atlas is an open source tool for metadata management and governance in Hadoop ecosystems.
Informatica Enterprise Data Catalog provides a comprehensive data discovery and metadata management solution.
Skills evaluated in this interview
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