Data Engineer Process Interview Questions
After general rounds of interviews, you will usually progress into a technical stage which consists of coding challenges, problem-solving, database system design on a whiteboard, a take-home exam, and analytical questions.
This stage can be quite intense, so knowing some of the usual data engineering interview questions and answers can help you ace the interview.
How Would You Check The Validity Of Data Migration Between Databases
A data engineer’s primary concerns should be maintaining the accuracy of the data and preventing data loss. The purpose of this question is to help the hiring managers understand how you would validate data.
You must be able to explain the suitable validation types in various instances. For instance, you might suggest that validation can be done through a basic comparison or after the complete data migration.
The Business Intelligence Engineer Role At Amazon
At Amazon, business intelligence engineers work with clients, analysts, and database developers to translate collected data into business decisions. The solutions created by these engineers assist in the analysis, automation, and reporting of both internal and external client data.
Frequently, Amazon engineers are embedded within teams and work cross-functionally with other teams, aiming to improve the overall customer experience. The roles of this position range from implementing solutions through data modeling to guiding business leaders.
Interview Query talked with an Amazon BI engineer about his job role and responsibilities. Here is what this Amazon business intelligence engineers does:
I ended up learning how to convert Python code to PySpark and then moved over to Amazon as a business intelligence engineer. Most of my work was around Tableau reporting, building ETL jobs, and figuring out what kind of data needed to be in the reporting databases so that your end reports work well.
Likely when going through the business intelligence interview, youll be interviewing in any one of these teams.
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Ace The Data Engineer Interview
…and get multiple job offers at top tech companies like Amazon, Facebook and Google!
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Prepare for questions about schema design, data modeling, and architecture design. Practice SQL and Python problems, and find what what interviewers really mean when they ask behavioral questions. Real world case studies to demonstrate the importance of designing scalable AWS infrastructure – learn about everything from storage to compute to data warehousing.
What Is A Cursor
A cursor is a temporary memory or workstation. It is allocated by the server when DML operations are performed on the table by the user. Cursors store Database tables. SQL provides two types of cursors which are:
Implicit Cursors: they are allocated by the SQL server when users perform DML operations.
Explicit Cursors: Users create explicit cursors based on requirements. Explicit cursors allow you to fetch table data in a row-by-row method.
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How Well Can You Work In Team Settings
I understand that you value teamwork here at Amazon, which I am prepared for when I get this job. I.would.love to confirm that I have worked in several teams before and therefore know how to get along with others and be of value in team settings. I can respect boundaries, motivate my team members to be at their best and contribute to the overall team performance. I am confident that I will get along well with your team thanks to my interpersonal and people skills, which have always come in handy in my career.
Cracking The Top Amazon Coding Interview Questions
Landing a job at Amazon is a dream for many developers around the globe. Amazon is one of the largest companies in the world, with a workforce of over half a million strong.
For you to join them, youll need to complete their unique interview that combines technical and leadership knowledge.
Today, Ill walk you through everything you need to crack the Amazon interview, including coding questions and a step-by-step preparation guide.
Today we will go over the following:
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What Is Root Cause Analysis
Root cause analysis was initially developed to analyze industrial accidents but is now widely used in other areas. It is a problem-solving technique used for isolating the root causes of faults or problems. A factor is called a root cause if its deduction from the problem-fault-sequence averts the final undesirable event from recurring.
What Is Your Biggest Strength How Does It Increase Your Chances Of Succeeding At This Job
I have many strengths that have helped me succeed as a data engineer. However, I believe that the main one is my willingness to learn. I am always looking for new information to help me advance in my career and improve my prowess. I usually love sharing information with my team members and learning from everyone regardless of their positions. I have managed to come this far owing to this attribute.
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What Does The Amazon Data Engineering Job At Amazon Entail
As a data engineer at Amazon, one assumes the following responsibilities:
- Designing, implementing, and automating Amazon’s distributed system for accumulating and processing log events from various sources
- Monitoring and troubleshooting data or operational issues in data pipelines
- Driving architectural plans and implementing them for analytic solutions, reporting, and future data storage
- Working alongside data scientists, business analysts, and other internal partners of Amazon to identify opportunities as well as problems
- Assisting the team to troubleshoot, research the root cause of an issue, and thorough resolving any defect in the event of a problem
The company offers an array of opportunities and experiences that facilitates one’s growth. Being a data engineer at Amazon allows you to push the envelope and set your career trajectory in the right direction.
Differentiate Between Relational And Non
Relational Database Management Systems
Non-relational Database Management Systems
Relational Databases primarily work with structured data using SQL . SQL works on data arranged in a predefined schema.
Non-relational databases support dynamic schema for unstructured data. Data can be graph-based, column-oriented, document-oriented, or even stored as a Key store.
RDBMS follow the ACID properties – atomicity, consistency, isolation, and durability.
Non-RDBMS follow the Brewers Cap theorem – consistency, availability, and partition tolerance.
RDBMS are usually vertically scalable. A single server can handle more load by increasing resources such as RAM, CPU, or SSD.
Non-RDBMS are horizontally scalable and can handle more traffic by adding more servers to handle the data.
Relational Databases are a better option if the data requires multi-row transactions to be performed on it since relational databases are table-oriented.
Non-relational databases are ideal if you need flexibility for storing the data since you cannot create documents without having a fixed schema. Since non-RDBMS are horizontally scalable, they can become more powerful and suitable for large or constantly changing datasets.
E.g. PostgreSQL, MySQL, Oracle, Microsoft SQL Server.
E.g. Redis, MongoDB, Cassandra, HBase, Neo4j, CouchDB
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Q6 Can You Tell Me What Are Eigenvectors And Eigenvalues
Eigenvectors: Eigenvectors are basically used to understand linear transformations. These are calculated for a correlation or a covariance matrix.
For definition purposes, you can say that Eigenvectors are the directions along which a specific linear transformation acts either by flipping, compressing or stretching.
Eigenvalue: Eigenvalues can be referred to as the strength of the transformation or the factor by which the compression occurs in the direction of eigenvectors.
Amazon Data Engineer Interview Practice Questions And Answers
Here are useful sample questions with answers that you can work with in your Amazon data engineer interview preparation:
For a question like this, you should not be vague you have to go straight to the point.
Tell the interviewer something you achieved and were proud of. You could tell of a time where you and some colleagues started working but didnt think the job would turn out to be fine because of certain issues, but at last, it had a beautiful ending, its been the best so far.
You need to explain why and how you got interested in data engineering.
Your answer could be something like, I always loved computers since when I was a kid, and so I knew I would find myself doing something related to it.
You could answer this by focusing on the fact that you are enthusiastic about new things, especially things you know will be profitable in the long run.
You can tackle this one by focusing on the fact that you have carried out your background study and research, and you know that this is the best place where you will grow tremendously.
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Q: Why Did You Create This Course
A: When I was in college I bought a similar mentorship program and it changed my life. The book was related to data science but unlike other courses that I found online, this course wasn’t just focused on optimizing code and tuning ML models. Instead this course focused on product and impacting the business. This course helped shape my mindset not only for future interviews, but my career as well! I see a similar opportunity in the data engineer landscape where a lot of courses suggest studying 100 SQL and python problems, when in reality that is only a portion of the what gets asked in a data engineer interview at companies like Amazon, Facebook and Google.
How Does Network File System Differ From Hadoop Distributed File System
Network File System
Hadoop Distributed File System
NFS can store and process only small volumes of data.
Hadoop Distributed File System, or HDFS, primarily stores and processes large amounts of data or Big Data.
The data in an NFS exists in a single dedicated hardware.
The data blocks exist in a distributed format on local hardware drives.
NFS is not very fault tolerant. In case of a machine failure, you cannot recover the data.
HDFS is fault tolerant and you may recover the data if one of the nodes fails.
There is no data redundancy as NFS runs on a single machine.
Due to replication across machines on a cluster, there is data redundancy in HDFS.
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Faqs On Amazons Interview Process
Question 1: Is it hard to get hired at Amazon?
Amazonâs hiring process is extremely competitive. However, an individual with the required skill set, knowledge, experience, and the right prep strategy can crack an interview at this company. Moreover, applicants can opt for professional interview prep to increase their chances of being hired at Amazon.
Question 2: How many rounds are there in Amazon interviews?
Interviews at Amazon begin with a phone screening, which includes a general discussion about the role, the candidate’s experience, etc., followed by a technical phone interview. Its on-site interview consists of five rounds â technical round, debugging round, culture-based round, data modeling round, complex SQL round â each lasts an hour. You can expect a few behavioral questions during each of these rounds.
What Do You Mean By Collaborative Filtering
Collaborative filtering is a method used by recommendation engines. In the narrow sense, collaborative filtering is a technique used to automatically predict a users tastes by collecting various information regarding the interests or preferences of many other users. This technique works on the logic that if person 1 and person 2 have the same opinion on one particular issue, then person 1 is likely to have the same opinion as person 2 on another issue than another random person. In general, collaborative filtering is the process that filters information using techniques involving collaboration among multiple data sources and viewpoints.
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Amazon Data Engineer Interview Strategy
What Was The Algorithm You Used In A Recent Project
First, decide which project you’d want to talk about. If you have a real-world example in your field of expertise and an algorithm relevant to the company’s work, utilize it to capture the hiring manager’s attention. Maintain a list of all the models and analyses you deployed. Begin with simple models and avoid overcomplicating things. The hiring supervisors want you to describe the outcomes and their significance. There could be follow-up questions like:
- Why did you choose this algorithm?
- What is the scalability of your model?
- If you were given more time, what could you improve?
What Is Data Modeling
Data modeling is a technique that defines and analyzes the data requirements needed to support business processes. It involves creating a visual representation of an entire system of data or a part of it. The process of data modeling begins with stakeholders providing business requirements to the data engineering team.
What Are The Various Design Schemas In Data Modeling
There are two fundamental design schemas in data modeling: star schema and snowflake schema.
Star Schema- The star schema is the most basic type of data warehouse schema. Its structure is similar to that of a star, where the star’s center may contain a single fact table and several associated dimension tables. The star schema is efficient for data modeling tasks such as analyzing large data sets.
Snowflake Schema- The snowflake schema is an extension of the star schema. In terms of structure, it adds more dimensions and has a snowflake-like appearance. Data is split into additional tables, and the dimension tables are normalized.
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Data Engineer Interview Questions On Sql
You will spend most of your career using SQL if you are a Data Engineer working in an organization. Building a strong foundation in SQL is crucial since you may easily save time and effort if you can leverage its various features effectively. Also, acquire a solid knowledge of databases such as the NoSQL or Oracle database. Questions addressing data modeling and database architecture test your understanding of entity-relationship modeling, normalization and denormalization, dimensional modeling, and relevant ideas. Below are a few data engineer interview questions on SQL concepts, queries on data storage, data retrieval, and a lot more.
How Do You Plan To Deal With Conflicts
I always try to avoid conflicts as much as possible since I know their effects on productivity when left unchecked. However, if I disagree with a colleague, I normally ensure that we settle our differences before the sun sets. I am usually the first to approach the other party for reconciliation purposes. I believe differences should be handled early enough before they blow out of proportion. I will not leave work until all conflicts between other employees are settled.
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What Are Different Data Validation Approaches
The process of confirming the accuracy and quality of data is known as data validation. It is implemented by incorporating various checks into a system or report to ensure that input and stored data are logically consistent. Common types of data validation approaches are
- Data type check: It confirms that the data entered is of the correct data type.
- Code check: A code check verifies that a field is chosen from a legitimate list of options or that it corresponds to specific formatting constraints. Checking a postal code against a list of valid codes, for example, makes it easier to verify if it is valid.
- Range check: It ensures that input falls in a predefined range.
- Format check: Many data types follow a predefined format. Format check confirms that. For example, a date has formats like DD-MM-YY or MM-DD-YY.
- Consistency check: It confirms that the data entered is logically correct.
- Uniqueness check: It ensures that the same data is not entered multiple times.
What Are The Skills Needed To Become A Data Engineer At Amazon
Data engineering is a confluence between data science and software engineering. In fact, many data engineers start as software engineers as data engineering relies heavily on programming.
Therefore, data engineers at Amazon are required to be familiar with:
Ã Building database systems.
Ã Maintaining database systems
Ã Finding warehousing solutions
Customer obsession is a part of Amazon’s DNA, making this FAANG company one of the world’s most beloved brands. Naturally, Amazon hires the best technological minds to innovate on behalf of its customers. The company calls for its data engineers to solve complex problems that impact millions of customers, sellers, and products using cutting-edge technology.
As a result, they are extremely selective about hiring prospective Amazonians. The company requires data engineers to have a keen interest in creating new products, services, and features from scratch.
Therefore, during the data engineer interview, your skills in the following areas will be assessed:
- Big data technology
- Summary statistics
- SAS and R programming languages
Since Amazon incorporates a collaborative workspace, data engineers work closely with chief technical officers, data analysts, etc. Therefore, becoming a data engineer at this FAANG firm also requires you to have soft skills, such as collaboration, leadership, and communication skills.