Northcorp Software Javascript Developer Interview Questions and Answers

Based on my CV, they assigned me a task related to data migration.

Q1. Project reviews
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Q2. Attendance regarding
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Q1. How would you handle missing dataduring analysis?
Ans. 
Handling missing data involves identifying, assessing, and applying appropriate techniques to manage gaps in datasets.
• Identify missing data: Use methods like 'isnull()' in Python to find missing values.

• Assess the impact: Determine how missing data affects your analysis and results.

• Imputation: Replace missing values with mean, median, or mode. For example, use the median for skewed distributions.

• Remove missing data: If ...read more
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Q2. Explain the difference inner join and left join in SQL ? and example
Ans. 
Inner join returns matching records from both tables, while left join returns all records from the left table and matching from the right.
• Inner Join: Combines rows from two tables where there is a match in both tables.

• Left Join: Returns all rows from the left table and matched rows from the right table; unmatched rows from the right will show NULL.

• Example of Inner Join: SELECT * FROM TableA INNER JOIN TableB ON TableA....read more
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Q3. Which visualisation have tools used and how do you decide which chart to used for a given dataset?
Ans. 
Choosing the right visualization depends on data type, audience, and insights needed.
• Use bar charts for categorical comparisons (e.g., sales by region).

• Line charts are ideal for trends over time (e.g., monthly revenue).

• Pie charts can show proportions but are less effective for many categories.

• Scatter plots help identify relationships between two variables (e.g., age vs. income).

• Heatmaps visualize data density or correl...read more
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Q1. What experience do you have in this role?
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Q2. What tools or technologies are you comfortable using?
Ans. 
I am proficient in various data analysis tools, including Excel, SQL, Python, and visualization software like Tableau.
• Excel: Advanced functions, pivot tables, and data visualization.

• SQL: Writing complex queries for data extraction and manipulation.

• Python: Utilizing libraries like Pandas and NumPy for data analysis.

• Tableau: Creating interactive dashboards for data visualization.

• R: Statistical analysis and data visualiza...read more
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Q1. What is Websocket?
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WebSocket is a protocol for full-duplex communication channels over a single TCP connection, enabling real-time data exchange.
• WebSocket allows persistent connections, reducing latency compared to traditional HTTP requests.

• It is commonly used in applications like chat apps, online gaming, and live notifications.

• WebSocket connections start with an HTTP handshake, then upgrade to a WebSocket connection.

• Example: A chat app...read more
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Q2. How do you integrate Websocket with Android Project.
Ans. 
Integrating WebSocket in an Android project allows real-time communication between client and server.
• 1. Add dependencies: Use libraries like 'OkHttp' or 'Java-WebSocket'. Example: 'implementation 'com.squareup.okhttp3:okhttp:4.9.1''

• 2. Create a WebSocket client: Use OkHttpClient to create a WebSocket instance. Example: 'OkHttpClient client = new OkHttpClient();'

• 3. Implement WebSocketListener: Override methods like onOpe...read more
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Q1. Work Experience
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Q2. Salary Expectations
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Q1. Products worked
Ans. 
Developed various products including web applications, APIs, and data analysis tools.
• Created a web application for tracking sales data using Django framework

• Built RESTful APIs for mobile applications using Flask

• Developed data analysis tools using pandas and numpy libraries
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Q1. Expectation and Joining Date
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Q1. More on projects done
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Q2. Team handling experience in past
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I led a team of developers, fostering collaboration and driving project success through effective communication and agile methodologies.
• Managed a team of 5 developers, overseeing project timelines and deliverables.

• Implemented Agile methodologies, resulting in a 30% increase in productivity.

• Conducted regular code reviews to ensure quality and adherence to best practices.

• Facilitated team meetings to encourage open commun...read more
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Q1. Working attitude and technical knowledge
Ans. How good you are in approaching problems and achieving solutions
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Q1. Tell about yourself
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Q2. Write a program using pythin
Ans. 
Program to print 'Hello, World!' in Python
• Use the print() function in Python to display text

• Enclose the text in single or double quotes
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