RecuriterIQ: An Intelligent Resume Screening System Based on Semantic Search and Large Language Models

RecuriterIQ is an intelligent recruitment tool that combines NLP, sentence embedding, and the Llama3 large language model. Its core goal is to replace traditional keyword matching with semantic matching, addressing pain points in resume screening such as time-consuming processes, talent omission, and implicit bias, thereby achieving fair and efficient talent evaluation.

Traditional ATS (Applicant Tracking Systems) rely on keyword matching and have three major issues: 1. Candidates using synonyms or different expressions are easily missed; 2. Over-reliance on keywords triggers an 'arms race' of resume optimization; 3. Inability to identify cross-domain transferable skills. Additionally, manual screening is time-consuming and has implicit bias, making it difficult to capture semantic-level ability matching.

RecuriterIQ uses Sentence Embeddings technology, leveraging the all-MiniLM-L6-2 model to convert resumes and job descriptions into high-dimensional vectors, and calculates semantic matching degree via cosine similarity. This method can identify:

• Semantic similarity between 'project management' and 'project coordination'
• Ability overlap between 'Python development' and 'Django backend engineer'
• Cross-industry transferable skill combinations Compared to keyword matching, it effectively avoids talent omission caused by expression differences.

Based on semantic matching scores, the system calls Llama3-70B (via Groq API) for in-depth analysis, outputting:

• Skill Extraction: Automatically identify tech stacks, soft skills, and industry experience
• Advantage Identification: Highlight candidates' core competitiveness
• Job Recommendation: Suggest the most suitable job directions
• Improvement Suggestions: Specific optimization plans for resume defects
• Interview Prompts: Targeted HR interview questions
• Comprehensive Score: Quantitative evaluation from 0 to 100 points The system architecture adopts a frontend-backend separation design: User → Streamlit frontend → FastAPI backend → PDF extraction/NLP preprocessing/embedding/similarity calculation/LLM analysis → JSON response → Frontend visualization, ensuring scalability and modularity.

Technology Stack Selection

Layer	Technology	Reason for Selection
Backend Framework	FastAPI	High-performance asynchronous support, auto-generated API documentation
Frontend Framework	Streamlit	Quickly build data application interfaces, Python-native
Embedding Model	all-MiniLM-L6-v2	Lightweight yet effective, suitable for production deployment
Similarity Calculation	Cosine Similarity	Industry standard, efficient computation
Large Model	Llama3-70B via Groq	Open-source and commercially usable, Groq provides high-speed inference
PDF Parsing	pdfplumber	Pure Python, excellent text and table extraction
Development Language	Python 3.12	Better type hint support, performance optimization

Implementation Highlights

• Modular Design: Clear separation of frontend and backend responsibilities, easy to test and maintain
• Asynchronous Processing: FastAPI's async feature supports concurrent processing of multiple resumes
• Configurability: Adjust similarity thresholds, LLM temperature parameters, etc., via environment variables

Core Functions

1. Resume Upload and Parsing: Support PDF format, extract text, tables, and formatted information
2. Semantic Matching Score: 0-100% score + color coding (green ≥80%, yellow 60-80%, red <60%)
3. AI-Driven Analysis: Explain match/mismatch reasons and挖掘 potential advantages of candidates
4. Bidirectional Suggestions: Provide interview prompts for HR, and resume improvement and career development advice for candidates

Application Scenarios

• Recruitment Teams: Batch initial screening, cross-department unified evaluation, activate historical talent pools
• Job Seekers: Resume diagnosis, job match recommendation, clear skill gaps

The current version only supports PDF resumes. Future plans include:

• Word document parsing
• Image resume OCR recognition
• Multilingual resume processing
• Batch folder upload
• Integration with mainstream ATS systems

RecuriterIQ does not replace HR, but enhances their decision-making capabilities through AI technology: semantic search discovers talent missed by keyword filtering, and large models provide deep insights, ultimately achieving a fairer and more efficient recruitment process. As an open-source solution, it can be directly deployed and easily customized, suitable for teams wanting to improve recruitment quality.