Persistent Systems Interview Questions (With Answers)

555 Questions asked

Mar 2026 First seen

Sep 2026 Last seen

555 Unique questions

🥧 Difficulty mix

How hard are these questions?

Easy 70 (13%)Medium 400 (72%)Hard 85 (15%)

📊 Question type

Breakdown by interview phase

🔥 12-week activity

When candidates are asked these

Last 12 weeks →

🏷️ Top topics

Where these questions cluster

Devops 70

Cloud Devops 55

Ai Machine Learning 50

Algorithms Data Structures 31

Python 28

Databases Sql 27

Security 24

Data Engineering 23

👤 Experience level mix

What seniority these are asked at

Fresher (0-1yr) 69Junior (1-3yr) 3Mid (3-6yr) 398Senior (6+yr) 85

📝 Recent questions

Latest 10 asked by candidates

🔴 Hard ✅

Describe the key functionalities of your data pipeline: the source system, the ingestion mechanism you use to bring data into cloud storage, the transformations and cleansing performed in the silver layer, the aggregation performed in the gold layer, and the consumers or users that consume the data. What is the business use case?

Data Pipeline Data Lake Silver Layer Gold Layer Ingestion Transformation Business Use Case

Conceptual · Asked 1× · Sep 2026

🟡 Medium ✅

In PySpark, please write a code snippet to perform a join between two DataFrames.

Pyspark Dataframes Join

Coding · Asked 1× · Sep 2026

🔴 Hard ✅

How would you design a system that receives a user query, uses a performance vector from a module, sends context to an AI component, and returns a global response?

System Design Ai Performance Vector Context Management

System Design · Asked 1× · Sep 2026

🟢 Easy ✅

Which AWS service is specifically designed for defining and enforcing data quality rules and thresholds in automated pipelines?

Aws Glue Data Quality Data Quality

Conceptual · Asked 1× · Jul 2026

🟡 Medium ✅

Which approach is correct for deploying Lambda functions in an AWS Elastic Kubernetes Service (EKS) cluster?

Aws Lambda Eks

Conceptual · Asked 1× · Jul 2026

🔴 Hard ✅

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🥧 Difficulty mix

📊 Question type

🔥 12-week activity

🏷️ Top topics

👤 Experience level mix

📝 Recent questions

In PySpark, please write a code snippet to perform a join between two DataFrames.

How would you design a system that receives a user query, uses a performance vector from a module, sends context to an AI component, and returns a global response?

Which AWS service is specifically designed for defining and enforcing data quality rules and thresholds in automated pipelines?

Which approach is correct for deploying Lambda functions in an AWS Elastic Kubernetes Service (EKS) cluster?

What security considerations apply to closures?

When is privilege a poor choice for a production system?

How would you document a production design that uses virtual?

What security considerations apply to trials?

What would you inspect first when linearizability is slow or unstable?

🎤 Want these answered in real-time during your interview?