QueueX

Production-grade distributed task queue and monitoring platform built with FastAPI, Celery, Redis, PostgreSQL, and React.

QueueX is an open-source asynchronous job processing platform designed to demonstrate production backend engineering concepts such as distributed workers, reliable task execution, retries, scheduling, real-time monitoring, and fault recovery.

Instead of executing long-running operations inside the request-response cycle, QueueX offloads work to background workers, enabling applications to remain responsive while processing jobs asynchronously.

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Why QueueX?

Modern applications frequently execute operations that take seconds or minutes to complete:

• AI inference
• Audio transcription
• Image processing
• Email delivery
• Report generation
• Data import/export
• File compression

Executing these tasks synchronously increases latency and limits scalability.

QueueX solves this problem by providing a reliable distributed background processing system.

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Features

Core Queue

• Asynchronous job processing
• FIFO scheduling
• Priority queues
• Delayed jobs
• Scheduled execution
• Retry queues
• Dead Letter Queue (DLQ)

Worker Engine

• Distributed workers
• Lease-based job reservation
• Worker heartbeats
• Graceful shutdown
• Automatic failure recovery
• Horizontal scaling

Monitoring

• Live dashboard
• Queue metrics
• Worker health
• Job timeline
• Execution logs
• Real-time WebSocket updates

Security

• JWT authentication
• Refresh tokens
• Authorization
• Input validation
• Idempotency support

Reliability

• At-least-once delivery
• Retry policies
• Lease expiration
• Crash recovery
• Structured logging

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Architecture

                Client Applications
        (AudioPilot, Trackathon, Dashboard)
                       │
                       ▼
                 QueueX REST API
                  (FastAPI)
                       │
        ┌──────────────┴──────────────┐
        │                             │
   PostgreSQL                    Redis Queue
        │                             │
        └──────────────┬──────────────┘
                       │
               Distributed Workers
                       │
                WebSocket Gateway
                       │
                 React Dashboard

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Tech Stack

Backend

• FastAPI
• Celery
• SQLAlchemy
• Alembic
• Pydantic

Database

• PostgreSQL

Queue

• Redis

Frontend

• React
• TypeScript
• Tailwind CSS

Infrastructure

• Docker
• Docker Compose
• Nginx

Testing

• Pytest

CI/CD

• GitHub Actions

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Project Structure

QueueX/
│
├── backend/
├── frontend/
├── worker/
├── docker/
├── docs/
├── scripts/
├── .github/
├── README.md
├── LICENSE
├── CHANGELOG.md
└── VERSION.md

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Documentation

The complete system design is available in the docs/ directory.

• Requirements Specification
• System Architecture
• Database Design
• Queue System Design
• REST API Specification
• Architecture Decision Records (ADRs)
• Development Roadmap

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Roadmap

Version 0.1

• Project foundation
• Docker
• PostgreSQL
• FastAPI

Version 0.2

• Authentication
• JWT
• User management

Version 0.3

• Job APIs
• Validation
• Pagination

Version 0.4

• Redis queue integration

Version 0.5

• Worker engine

Version 0.6

• Retry system
• Dead Letter Queue
• Failure recovery

Version 0.7

• Dashboard

Version 0.8

• WebSockets

Version 0.9

• Testing
• CI/CD

Version 1.0

• Production-ready release

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Planned Integrations

QueueX is designed to be reusable infrastructure for multiple applications.

Initial integrations include:

• AudioPilot — asynchronous transcription and AI processing
• Trackathon — playlist imports, analytics, and background synchronization

Future applications can integrate with QueueX through its REST API and worker framework.

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Contributing

Contributions, feature requests, and bug reports are welcome.

Please read the contribution guidelines before opening a pull request.

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License

This project is licensed under the MIT License.