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title: README
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# Hi, I'm Kalana Hewapathirana 👋

**Software Engineer & Computer Science Educator** · Colombo, Sri Lanka 🇱🇰

BSc (Hons) Computer Science graduate working at the intersection of applied machine learning and education. I build end-to-end ML systems — data pipelines, model training, APIs, and dashboards — with a focus on NLP, computer vision, and document AI. Currently teaching Computer Science (Pearson Edexcel iLowerSecondary & IGCSE) while continuing to build and share ML work here.

## 🔬 What I work on

- **NLP & Text Classification** — Sentence Transformers and BERT-based classifiers for app review and complaint analytics
- **Computer Vision** — CNNs for diabetic retinopathy detection, transfer learning with DenseNet121
- **OCR & Document AI** — EasyOCR pipelines for digitizing handwritten records
- **ML Engineering** — FastAPI, PostgreSQL, SQLite, Streamlit dashboards, embedding storage and retraining pipelines

## 🚀 Featured Projects

| Project | Stack | Highlights |
|---|---|---|
| **Diabetic Retinopathy Detection** | TensorFlow, custom CNN | 98% accuracy lightweight model; benchmarked against DenseNet121 with test-time augmentation |
| **SLT Selfcare Bug Analytics** | BERT, Streamlit | Classifies Play Store reviews into bug categories, cutting manual triage time |
| **Review Analytics Engine** | Sentence Transformers, Logistic Regression, SQLite | End-to-end complaint classification with a retraining pipeline |
| **WiFi Router Localization** | Particle & Kalman Filters, FastAPI, Leaflet.js | Real-time RSSI/GPS positioning with live map visualization |
| **Fiber Length OCR** | EasyOCR, Python | Automated extraction of handwritten fiber data into a queryable database |

## 🛠️ Tech Stack

`Python` · `TensorFlow` · `PyTorch` · `Scikit-learn` · `Transformers` · `FastAPI` · `PostgreSQL` · `SQLite` · `Streamlit` · `EasyOCR` · `Git`

## 🎓 Background

- **BSc (Hons) Computer Science** — South Eastern University of Sri Lanka
- **Computer Science Teacher** — IES College International (Pearson Edexcel)
- **Software Engineer (Intern)** — Sri Lanka Telecom, Digital Platforms

## 📫 Connect

[![LinkedIn](https://img.shields.io/badge/LinkedIn-0A66C2?style=flat&logo=linkedin&logoColor=white)](https://linkedin.com/in/hewapathirana-kr)
[![GitHub](https://img.shields.io/badge/GitHub-181717?style=flat&logo=github&logoColor=white)](https://github.com/kaan84k)
[![Email](https://img.shields.io/badge/Email-D14836?style=flat&logo=gmail&logoColor=white)](mailto:kalanarandil@gmail.com)