How I Built a Concurrency-Safe Reservation System

📰 Dev.to · Rahul Chaduvula

Learn how to build a concurrency-safe reservation system using FastAPI, PostgreSQL, Redis, and SQLAlchemy to prevent race conditions

intermediate Published 10 Jul 2026

Action Steps

Design a database schema using PostgreSQL to store seat reservations
Implement concurrency control using Redis to prevent race conditions
Build a RESTful API using FastAPI to handle reservation requests
Use SQLAlchemy to interact with the database and ensure data consistency
Test the system with multiple concurrent requests to ensure its safety and scalability

Who Needs to Know This

Backend developers and software engineers can benefit from this article to improve their understanding of concurrency control and build scalable reservation systems

Key Insight

💡 Proper concurrency control is crucial to prevent race conditions in reservation systems

Key Takeaways

Learn how to build a concurrency-safe reservation system using FastAPI, PostgreSQL, Redis, and SQLAlchemy to prevent race conditions

Full Article

Title: How I Built a Concurrency-Safe Reservation System

URL Source: https://dev.to/rahul_chaduvula_a406acb5c/how-i-built-a-concurrency-safe-reservation-system-2eea

Published Time: 2026-07-10T08:03:29Z

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Posted on Jul 10

# How I Built a Concurrency-Safe Reservation System

[#webdev](https://dev.to/t/webdev)[#backend](https://dev.to/t/backend)[#softwareengineering](https://dev.to/t/softwareengineering)[#programming](https://dev.to/t/programming)

> **What happens when 100 users try to reserve the same seat at exactly the same time?**

Without proper concurrency control, multiple users could end up booking the same seat—a classic race condition that every booking platform must solve.

To better understand how production reservation systems handle this problem, I built a **Concurrency-Safe Movie Reservation Backend** using **FastAPI**, **PostgreSQL**, **Redis**, and **SQLAlchemy**.

Rather than focusing on frontend features, my goal was to explore the backend engineering concepts that make reservation sy

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How I Built a Concurrency-Safe Reservation System

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