Synoptek Senior Data Engineer Interview Questions and Answers

Q1. Project related question
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Q1. Scenario based question
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Q1. Salary discussion
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Q1. What are different KPI's
Ans. 
Key Performance Indicators (KPIs) are measurable values that demonstrate how effectively a company is achieving key business objectives.
• KPIs are specific, measurable, achievable, relevant, and time-bound metrics used to evaluate the success of an organization or a particular activity.

• Examples of KPIs include revenue growth rate, customer acquisition cost, customer retention rate, website traffic, conversion rate, and e
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Q2. Differentiate loc and iloc in pandas
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loc is label-based indexing while iloc is integer-based indexing in pandas.
• loc is used to access a group of rows and columns by labels

• iloc is used to access a group of rows and columns by integer position

• Example: df.loc['row_label', 'column_label'] vs df.iloc[0, 1]
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Easy applitute question with 1 coding question at the end

Q1. String builder vs string buffer
Ans. 
String builder is faster but not thread-safe, while string buffer is slower but thread-safe.
• String builder is recommended for single-threaded applications for better performance.

• String buffer is recommended for multi-threaded applications to ensure thread safety.

• Example: StringBuilder sb = new StringBuilder(); StringBuffer sbf = new StringBuffer();
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Q2. Final keyword in oops
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The final keyword in OOP is used to restrict the user from changing the value of a variable, overriding a method, or inheriting from a class.
• Final variable: value cannot be changed once assigned

• Final method: cannot be overridden in child classes

• Final class: cannot be inherited by other classes
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Q3. Bsf graph explanation
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BSF graph explanation
• BFS (Breadth-First Search) is a graph traversal algorithm that explores all the neighbor nodes at the present depth before moving on to the nodes at the next depth.

• It uses a queue data structure to keep track of the nodes to visit next.

• BFS is often used to find the shortest path in an unweighted graph.

• Example: BFS can be used to find the shortest path in a maze from the starting point to the exit.
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Q1. Basic to medium questions related to DotNet Core MVC, SQL Server, etc
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Q1. Completely unprofessional behavior of the interviewer. - No Introduction Direct start asking questions. - Asking too many misleading questions (First ask what you worked on, then ask did you heard about th...read more
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Q1. Self Introduction
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Q2. Salary Expectation
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Q1. 14 questions in excel formulas
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Object Detection on a subset of COCO dataset having Cars and Person classes

Q1. Technical discussion on Machine Learning, Deep Learning Concepts and coding round.
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Q1. Technical discussion on Deep Learning and Computer Vision.
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30 mins Aptitude Question

30 mins - 3 Coding Question

Q1. Describe Rest API
Ans. 
Rest API is a set of rules and conventions for building and interacting with web services using HTTP methods.
• Rest API stands for Representational State Transfer Application Programming Interface.

• It uses standard HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations.

• RESTful APIs use URLs to access resources, and return data in JSON or XML format.

• Stateless communication allows for scalability and flexibilit...read more
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Q2. What is various Response code. Diffenrence b/w 200 & 201, 400 & 403
Ans. 
Response codes indicate the status of a HTTP request. 200 & 201 are success codes, while 400 & 403 are client error codes.
• 200 - OK: Request was successful

• 201 - Created: Request was successful and a new resource was created

• 400 - Bad Request: The server cannot process the request due to a client error

• 403 - Forbidden: The server understood the request, but refuses to authorize it
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