Jiahui Li

AI Application Development Engineer

15262073926 · 3314794663@qq.com · 22 years old

Summary

AI application engineer specializing in computer vision and large language model (RAG) applications, with full-cycle experience taking AI projects from 0 to 1 — data processing, model training and inference, backend services, and frontend dashboards.

Experience

AI Vision Behavior Monitoring System

Nov 2025 – Jun 2026

Suzhou Kunyin Technology Co., Ltd. · System Development

Built a real-time video AI behavior analysis platform for biopharmaceutical production B/C/D cleanrooms (PPE compliance monitoring, key operation monitoring, and GMP audit trail), ingesting 16 production/inspection channels from Hikvision NVR.
Developed FastAPI microservices with camera management, tiered alarming, RBAC authorization, audit logging, report export, and REST APIs to meet GMP compliance.
Built a custom YOLOv8 detection service handling 16 HLS/RTSP streams for PPE detection (mask / goggles / gloves / protective suit) with ≤3s per-channel response and ≥95% accuracy.
Set up FFmpeg + ZLMediaKit video pipeline (NVR → HLS, multi-channel preview, AI frame extraction); integrated Hikvision AIOP with alarm dedup, snapshot archiving, and WebSocket real-time notifications.
Developed a Vue 3 + Electron dashboard with HLS.js playback and a security module (JWT auth, AES-256 encryption, face de-identification, audit trail).

Software Copyright Technical Consultant

Mar 2024 – Present

Independent Technical Consultant (Part-time)

Provided end-to-end technical solutions for software copyright applications, independently completing requirement analysis, code development, UI design, and technical documentation for 7+ software projects.
Achieved a first-pass approval rate above 85%, with the remaining clients approved after amendments.
Tech stack spans Python / Java / JavaScript, MySQL, and Vue / React, selected flexibly to match each client's needs for efficient delivery.
Built a template- and review-criteria-driven documentation workflow with Office automation and professional writing to improve approval rates and delivery efficiency.

Projects

RAG Knowledge Base Q&A System

Designed and built an enterprise RAG system supporting 6 document formats (PDF / DOCX / CSV, etc.) with a multi-stage retrieval and evaluation pipeline.
Hybrid retrieval: FAISS (HNSW) vector search + BM25 (jieba) fused via RRF, improving Recall@5 by 18%.
Cross-Encoder re-ranking with bge-reranker-v2-m3, improving Top-5 MRR by 15% and reducing hallucination by 67%.
Query rewriting with LLM (e.g. "last year's net income" → "2025 net income") improving Recall by 23%; multi-turn dialogue and coreference resolution improving follow-up accuracy by 40%.
ReAct Agent with tool calling and visualized reasoning; MRR / NDCG / Recall@k evaluation suite with A/B comparison.

License Plate Recognition & Vehicle Access Management System

Built FastAPI backends for vehicle archives, whitelist management, access records, recognition-result search, and statistical reports, secured with JWT.
Implemented license plate detection with YOLOv8 and character recognition with PaddleOCR; added image preprocessing and confidence filtering for night, tilt, and occlusion scenarios.
Processed camera streams with OpenCV (keyframe extraction, result overlay, snapshot archiving) and pushed abnormal vehicles via WebSocket for real-time display.

YOLOv8-based Steel Surface Defect Detection System

Built a YOLOv8 defect detection and classification model; used data augmentation and loss optimization for small objects and class imbalance, improving mAP to over 92%.
Applied OpenCV image preprocessing (illumination normalization, ROI cropping, noise suppression) for robustness under harsh factory lighting and reflections.
Developed FastAPI APIs for defect record management, statistical reports, and historical queries; ran real-time inference on industrial camera streams with WebSocket alerts.

Education

B.Eng. in Artificial Intelligence

Sep 2022 – Jun 2026

Kewen College, Jiangsu Normal University

Volunteer Experience

Xuzhou Marathon & Grand Canal Marathon Volunteer

Nov 5, 2023

Led and organized 11 volunteers across registration, water stations, and cheer squads, primarily managing operations at the finish-bag pickup point.
Coordinated with 5 other volunteers to efficiently serve the supply needs of 2,000+ runners with zero errors.
Strictly followed organizing committee procedures, serving 8+ hours continuously to keep race operations smooth.

Honors

First-author paper "Deep Learning-based Fraudulent App Intelligent Recognition and Analysis System", published in Internet Weekly.
Software copyright: "Fraudulent App Intelligent Recognition and Analysis System V1.0".
Third prize, 15th Blue Bridge Cup provincial competition.
CET-6 (College English Test Band 6).
Jiangsu Provincial College Student Innovation and Entrepreneurship Training Program.

Skills

PythonFastAPIFlaskSQLAlchemyMySQLSQLiteOpenCVYOLOv8PyTorchFAISSBM25BGE EmbeddingRAG / LLMVue 3PiniaElectronWebSocketFFmpegStreamlit