Data Engineering

30 interview prep topics with adaptive MCQ tests.

Data Pipelines
Data Pipelines are the backbone of modern data-driven organisations, enabling the reliable flow of information from…
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Apache Kafka
Apache Kafka has become an indispensable technology for building high-throughput, fault-tolerant, and scalable…
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Message Queues
Message Queues are fundamental components in modern distributed systems, enabling asynchronous communication and loose…
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Apache Spark Lazy Evaluation
Apache Spark Lazy Evaluation is a core execution paradigm where transformations on distributed datasets are not…
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Change Data Capture (CDC)
Change Data Capture (CDC) is a design pattern for determining and tracking data changes in a database so that action…
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Data Lake vs Data Warehouse
The debate between Data Lakes and Data Warehouses remains a cornerstone of data engineering interviews in 2026. As…
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Data Quality and Observability
Data Quality and Observability has evolved from simple row-count checks to a critical engineering discipline in 2026.…
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Data Skew in Distributed Processing
Data skew in distributed processing occurs when data is unevenly distributed across partitions, causing a subset of…
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Dimensional Modeling (Star Schema)
Dimensional modeling is a foundational technique in data warehousing, designed to optimize data for end-user query…
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ETL vs ELT
ETL (Extract, Transform, Load) and ELT (Extract, Load, Transform) represent the two fundamental paradigms for data…
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Feature Engineering for ML Pipelines
Feature Engineering for ML Pipelines is the systematic process of transforming raw data into predictive signals that…
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Medallion Architecture
Medallion Architecture is a data design pattern used to logically organize data in a lakehouse, facilitating a…
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Dead Letter Queues (DLQ)
A Dead Letter Queue (DLQ) is a specialized message queue used by messaging systems to store messages that cannot be…
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Event Sourcing & CQRS
Event Sourcing and Command Query Responsibility Segregation (CQRS) represent an advanced architectural paradigm shift…
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Exactly-Once Semantics
Exactly-once semantics (EOS) represents the gold standard in distributed messaging, ensuring that an event is processed…
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Kafka Consumer Groups
Kafka Consumer Groups are the fundamental mechanism for horizontal scalability and fault tolerance in Apache Kafka. By…
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Kafka Streams vs Flink
In the modern 2026 data landscape, choosing between Kafka Streams and Apache Flink is a defining architectural decision…
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Outbox Pattern
The Outbox Pattern is a critical architectural solution for ensuring data consistency in distributed systems,…
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Apache Airflow Orchestration
Apache Airflow has cemented its position as the industry standard for programmatic workflow orchestration, moving far…
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Apache Flink Stream Processing
Apache Flink stream processing has become the definitive backbone for real-time data pipelines, low-latency analytics,…
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Apache Hadoop & HDFS
Apache Hadoop and the Hadoop Distributed File System (HDFS) remain foundational pillars for large-scale distributed…
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Apache Hive Engine
The Apache Hive Engine remains a fundamental component of enterprise big data analytics architectures in 2026, serving…
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Apache Iceberg Table Format
The Apache Iceberg table format has fundamentally transformed the modern data engineering landscape by bringing…
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Apache Spark Engine & Scale
Apache Spark has cemented its position as the foundational unified analytics engine for large-scale data engineering,…
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Celery task queue
The Celery task queue is an open-source, asynchronous task queue or job queue based on distributed message passing. It…
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Data Modeling Schemas
Data modeling schemas form the architectural bedrock of modern analytical data systems, bridging raw operational data…
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dbt Data Build Tool
The Data Build Tool, universally known as dbt, has firmly established itself as the bedrock of modern analytics…
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Delta Lake storage layer
The Delta Lake storage layer represents one of the most critical foundational components in modern data engineering,…
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Presto & Trino Query Engines
Presto and Trino represent the pinnacle of distributed SQL query engines designed for low-latency, ad-hoc analytics…
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RabbitMQ message broker
The RabbitMQ Message Broker stands as the industry-standard implementation of the Advanced Message Queuing Protocol…
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