From Messy Scripts to Production Minded Architecture: Refactoring Job Copilot

Description and use

Refactored Job Copilot from a messy prototype to a production-ready codebase with clean architecture, automated tests, proper migrations, and enhanced security.

Problem

The Job Copilot codebase was unmaintainable, lacking tests, containing hardcoded secrets, mixing concerns, no migration system, insecure defaults, and a cluttered repository, making it unsuitable for production.

Outcome

Job Copilot transitioned from a chaotic prototype to a production-ready platform with clean architecture, automated tests, proper migrations, and hardened security.

Workflow

• Clean repository structure and move core code to backend/
• Define layered architecture: routes, services, repositories, models
• Add automated tests covering unit and integration boundaries
• Integrate Alembic for database migrations and implement schema guard
• Revise security: rotate API key, restrict CORS, bind uvicorn to 127.0.0.1
• Scrub PII and update .env.example
• Establish strict dependency management with upper bounds, hash-locked lockfile, and CI enforcement

Evidence

Zero Automated Tests

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Hardcoded Secrets in .env.example

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No Database Migration System

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I went from zero tests to a robust suite of 156 automated tests

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I integrated Alembic for proper database schema versioning

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