Projects

`$ ls projects`

`library-rest-api/`

REST API for a library catalog with JWT authentication and role-based access control
Nested book reviews with ownership-based permissions — admins can moderate, not edit
Filtering, sorting, and pagination on catalog and review endpoints
Zod schema validation with coercion, defaults, and centralized error handling
60-test suite (Vitest + Supertest, 93% coverage), including a fixed auth bypass bug

RuntimeNode.js

FrameworkExpress

ValidationZod

TestingVitest

Node.js

Express.js

Zod

Vitest

Supertest

`knn-cli-tool/`

From-scratch CLI KNN classifier — Euclidean, Manhattan, Cosine metrics
Interactive CLI with real-time input validation
2D/3D visualization and descriptive statistics; tested on 2,896-point datasets
96.76% avg. accuracy across 10 runs (95.07-98.59%), +34% vs. baseline
8-file test suite covering algorithm, metrics, normalization, and error handling

LanguagePython

CLITyper

Testspytest

LicenseMIT

Python

Typer

Rich

Matplotlib

pytest

`matrix-library-java/`

Java library for numerical matrix operations
Matrix arithmetic, determinants, and inverses
From-scratch Gauss-Jordan elimination
84% line / 81% branch coverage (JaCoCo, 86 methods)
500x500 inversion in ~186ms (see benchmarks)

LanguageJava

BuildMaven

TestsJUnit 5

LicenseMIT

Java

Maven

JUnit5

JaCoCo