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Top 40 PostgreSQL Coding Challenges for Senior Developers

Curated collection of challenging PostgreSQL questions typically asked in senior developer interviews at top tech companies

Core Concepts
Data Structures and Algorithms
System Design
Coding and Debugging

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Core Concepts

Data Structures and Algorithms

System Design

Coding and Debugging

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Top 40 PostgreSQL Coding Challenges for Senior Developers

AI-Powered Technical Assessment

Core Concepts

Write a query to pivot dynamic columns based on distinct category values

Create a materialized view with concurrent refresh capability

Implement a custom aggregate function to calculate median

Write a query to handle slowly changing dimensions (SCD) Type 2

Create a function to generate a UUID-based sequential ID

Implement a query to find the longest streak of consecutive events

Implement a recursive CTE to generate a hierarchical view of employees and their managers

Write a query to find running totals of sales by date with a 7-day moving average

Create a function to generate and maintain an audit trail for table changes

Implement a query to find gaps in a sequence of consecutive numbers

Data Structures and Algorithms

How would you implement an LRU Cache using PostgreSQL?

Implement a sliding window function to calculate moving averages over time series data

How would you implement a stack data structure in PostgreSQL?

Implement a solution to find pairs of numbers that sum to a target value

How would you implement a priority queue in PostgreSQL?

Implement a graph traversal algorithm using recursive CTEs

How would you implement a binary search tree traversal in PostgreSQL?

Implement a solution to find the median in a streaming data scenario

How would you implement a trie (prefix tree) structure in PostgreSQL?

Implement a solution for finding the longest increasing subsequence

System Design

Design a scalable URL shortener service using PostgreSQL. What schema and architecture would you use?

How would you design a real-time notification system using PostgreSQL's LISTEN/NOTIFY feature?

Design a social media feed system with PostgreSQL. How would you handle scaling reads and writes?

How would you implement a distributed rate limiter using PostgreSQL?

Design a job queue system with PostgreSQL for handling background tasks. How would you ensure reliability and scaling?

Design a real-time analytics system using PostgreSQL. How would you handle high-volume inserts and aggregations?

How would you implement a distributed session management system using PostgreSQL?

Design a content tagging system with efficient search capabilities using PostgreSQL.

How would you implement a distributed locking mechanism using PostgreSQL?

Design a scalable e-commerce inventory management system using PostgreSQL.

Coding and Debugging

Implement a trigger to maintain audit logs for table changes

Write a PostgreSQL query to find duplicate records in a table based on multiple columns

Create a recursive CTE to generate a sequence of dates between two dates

Write a query to pivot rows into columns dynamically

Create a function to calculate running totals with window functions

Debug a slow-performing query using EXPLAIN ANALYZE

Write a query to find gaps in sequential data

Implement a custom aggregate function for median calculation

Debug and fix a deadlock situation in concurrent transactions

Implement a hierarchical query for organizational structure

Streamline Your PostgreSQL Hiring Process

Interview Questions for Other Related Skills

Why Index.dev?

Our talent is hand-picked

We prioritize speed

We respect your budget

Top 40 PostgreSQL Coding Challenges for Senior Developers

AI-Powered Technical Assessment

Core Concepts

Write a query to pivot dynamic columns based on distinct category values

Create a materialized view with concurrent refresh capability

Implement a custom aggregate function to calculate median

Write a query to handle slowly changing dimensions (SCD) Type 2

Create a function to generate a UUID-based sequential ID

Implement a query to find the longest streak of consecutive events

Implement a recursive CTE to generate a hierarchical view of employees and their managers

Write a query to find running totals of sales by date with a 7-day moving average

Create a function to generate and maintain an audit trail for table changes

Implement a query to find gaps in a sequence of consecutive numbers

Data Structures and Algorithms

How would you implement an LRU Cache using PostgreSQL?

Implement a sliding window function to calculate moving averages over time series data

How would you implement a stack data structure in PostgreSQL?

Implement a solution to find pairs of numbers that sum to a target value

How would you implement a priority queue in PostgreSQL?

Implement a graph traversal algorithm using recursive CTEs

How would you implement a binary search tree traversal in PostgreSQL?

Implement a solution to find the median in a streaming data scenario

How would you implement a trie (prefix tree) structure in PostgreSQL?

Implement a solution for finding the longest increasing subsequence

System Design

Design a scalable URL shortener service using PostgreSQL. What schema and architecture would you use?

How would you design a real-time notification system using PostgreSQL's LISTEN/NOTIFY feature?

Design a social media feed system with PostgreSQL. How would you handle scaling reads and writes?