Resufit: An Intelligent Resume Analysis and ATS Optimization System Based on Large Language Models

Resufit is an AI-driven resume analysis and optimization tool built with Python and Flask. It integrates the large language model capabilities of the Groq API, providing functions such as ATS scoring, job matching analysis, and AI-enhanced resume generation. It helps job seekers break through automated screening systems and solves the problems of low efficiency and difficulty in quantifying results in traditional resume optimization. The project is open-sourced on GitHub and maintained by bharathkarri23-svg.

In today's job market, over 90% of large enterprises use ATS (Applicant Tracking Systems) for initial resume screening. Many qualified candidates are eliminated due to format inconsistencies or lack of key skill keywords. Traditional resume optimization relies on manual experience or expensive career consulting services, which are inefficient and difficult to quantify results. Resufit addresses this pain point by leveraging the natural language understanding and generation capabilities of large language models to provide a data-driven, quantifiable resume optimization solution.

Resufit integrates multiple key functional modules:

1. AI-driven ATS scoring analysis: Comprehensive scoring from three dimensions—readability, format standardization, and keyword density; supports scanned PDF parsing (PyMuPDF + Tesseract OCR);
2. Intelligent job description matching: Performs gap analysis, identifies matching/missing industry keywords and certification recommendations;
3. Interactive resume generation wizard: WYSIWYG editing experience;
4. Multi-template layout library: 8 professional templates with real-time switching;
5. AI resume customization: Automatically rewrites professional summaries and experience descriptions via Groq API's Llama series models.

Resufit's tech stack:

• Backend: Python 3.13 + Flask framework;
• AI capabilities: Groq API integration with Llama-3.3-70b-versatile and Llama-3.1-8b-instant models;
• Text/image parsing: PyMuPDF, Pillow, Tesseract OCR;
• Frontend: HTML5 + CSS3 + JS (glassmorphism design, responsive interface);
• Data storage: SQLite3 (user records and session caching).

Resufit's usage flow:

1. Upload resume PDF → System performs ATS scoring analysis (displays readability score, keyword coverage, and format suggestions);
2. Paste target job description → Perform job matching analysis, identify gaps, and provide improvement suggestions;
3. Build resume from scratch: Input personal information, educational background, etc., via the wizard; AI automatically optimizes content;
4. Switch templates (8 professional styles) → Export final PDF resume.

Resufit's significance:

1. Provides accessible, quantifiable tools for job seekers, reducing information asymmetry in job hunting;
2. Demonstrates a complete solution combining LLM with OCR and PDF parsing technologies, which can be extended to scenarios like contract analysis and report generation;
3. Provides a Flask + AI integration example for the open-source community, showing best practices for Python web applications interacting with external AI services (API calls, error handling, response caching, etc.).