Sigmoid Senior Data Engineer Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on CSS and Jquery mainly.

Q1. What is the CSS box model?
Ans. 
The CSS box model is a design and layout concept that defines the structure and sizing of elements on a web page.
• It consists of content, padding, border, and margin around an element.

• Content area is where text and images are displayed.

• Padding is the space between the content and the border.

• Border is the line that goes around the padding and content.

• Margin is the space outside the border.

• Example: div { width: 200px; pad...read more
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Q2. How do you select all div elements using jQuery?
Ans. 
To select all div elements using jQuery, use the selector $('div').
• Use the jQuery selector $('div') to select all div elements on the page.

• You can also use the find() method to select div elements within a specific parent element.

• To perform actions on the selected div elements, use jQuery methods like css(), text(), or addClass().
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Q3. How can you change the background color of all items in JavaScript?
Ans. 
You can change the background color of all items in JavaScript by selecting all elements and setting their background color property.
• Select all elements using document.querySelectorAll()

• Loop through the selected elements and set their style.backgroundColor property

• Example: document.querySelectorAll('.item').forEach(item => item.style.backgroundColor = 'blue');
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Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on Java mainly.

Q1. What are the uses of the final keyword in Java?
Ans. 
The final keyword in Java is used to define constants, prevent method overriding, and make a class immutable.
• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be extended
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Q2. What is the Front Controller in Spring MVC?
Ans. 
Front Controller in Spring MVC is a design pattern that handles all requests and acts as a central point of control.
• Front Controller is a servlet in Spring MVC that receives all requests and then dispatches them to the appropriate handlers.

• It helps in centralizing request handling logic, improving code organization and reducing duplication.

• Front Controller can perform tasks like authentication, logging, exception handl...read more
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Q3. What is the annotation for request mapping in Java?
Ans. 
The annotation for request mapping in Java is @RequestMapping.
• @RequestMapping annotation is used to map web requests to specific handler methods in Spring MVC.

• It can be applied at class level or method level to specify the URL path that the controller will handle.

• You can also specify HTTP request methods, headers, parameters, and more using @RequestMapping.
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Q4. What is the annotation used for a controller in Java?
Ans. 
The annotation used for a controller in Java is @RestController.
• Used to define a class as a controller in Spring MVC

• Automatically serializes return objects into JSON/XML responses

• Equivalent to @Controller + @ResponseBody annotations
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Round duration - 30 minutes
Round difficulty - Easy

This was a typical HR round.

Basics of SQL, Python

Experience based questions, SQL and Python

Q1. Tell me about the projects you worked on
Ans. 
I have worked on projects involving building data pipelines, optimizing data storage, and developing machine learning models.
• Built data pipelines using Apache Spark and Airflow

• Optimized data storage by implementing partitioning and indexing strategies

• Developed machine learning models for predictive analytics
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Q2. Based on experience some questions related to projects.
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Q1. SQL problems to solve nth highest salary
Ans. 
Use SQL query with subquery to find nth highest salary
• Use ORDER BY and LIMIT to get the nth highest salary

• Use a subquery to exclude the top n-1 salaries before selecting the nth highest salary
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Q1. GCP big query Architecture
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Language coding test which might be very specific to the proficient for data technologies

Q1. More of basic understanding on the concepts of processing of data and related technologies
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Q1. In terms of architecture understanding and designing perspective
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