My Data Engineer Interview Experience ----------------------------------------------------------------------------------- I recently interviewed for a Data Engineer role and wanted to share some of the topics and questions I came across. Hopefully, this helps anyone preparing for similar roles! 🔹 Python / Programming Difference between list, tuple, and set in Python How Python handles memory management and garbage collection Multithreading vs multiprocessing in Python Writing efficient Pandas operations for large datasets 🔹 SQL & Databases Write a query to find the nth highest salary in an Employee table Difference between OLTP and OLAP systems How indexes work in relational databases and when to use them Partitioning vs sharding in large datasets 🔹 Big Data & ETL Difference between batch and streaming data pipelines Kafka vs Kinesis: when to use each How Spark optimizes jobs under the hood (RDD, DataFrame, Catalyst optimizer) Best practices for building resilient ETL pipelines 🔹 Cloud & Data Warehousing Snowflake vs Redshift vs BigQuery: key differences How to design a data lake vs a data warehouse Role of IAM and data security in cloud environments How orchestration works with Apache Airflow 🔹 Coding Round Reverse words in a string without using built-in functions Implement a Kafka producer-consumer in Python Write an Airflow DAG for a daily ETL job Find duplicates in a dataset efficiently ----------------------------------------------------------------------------------- Hope this helps anyone preparing for their Data Engineer interviews! hashtag#DataEngineer hashtag#BigData hashtag#Python hashtag#SQL hashtag#ApacheSpark hashtag#Snowflake hashtag#Airflow hashtag#Kafka hashtag#ETL hashtag#InterviewPreparation hashtag#Coding

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Important reminder, if you own a domain name and don't use it for sending email. There is nothing to stop scammers from sending email claiming to be coming from your domain. And the older it gets, the more valuable it is for spoofing. It could eventually damage your domain's reputation and maybe get it blacklisted, unless you take the steps to notify email servers that any email received claiming to come from your domain should be trashed. Just add these two TXT records to the DNS for your domain: TXT v=spf1 -all TXT v=DMARC1; p=reject; The first says there is not a single SMTP server on earth authorized to send email on behalf of your domain. The second says that any email that says otherwise should be trashed. If you do use your domain for sending email, be sure to add 3 records: SPF record to indicate which SMTP server(s) are allowed to send your email. DKIM records to add a digital signature to emails, allowing the receiving server to verify the sender and ensure message integrity. DMARC record that tells the receiving email server how to handle email that fails either check. You cannot stop scammers from sending email claiming to be from your domain, any more than you can prevent people from using your home address as a return address on a mailed letter. But, you can protect both your domain and intended scam victims by adding appropriate DNS records. #cybersecurity #email #DomainSpoofing #EmailSecurity #phishing

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