Québec City's bike-share charges you once a ride passes 30 or 45 minutes, and normal map apps ignore that. This planner splits a trip into several rides on the same bike: you re-dock along the way so the clock resets. It also accounts for hills.

Result: across 1,000 sampled trips, the share charged overage fees fell from 49.6% to 0%.

Live demo · Python FastAPI OSRM Next.js

An ORM generator built as a small compiler. You describe your schema in a .nexus file. NexusORM generates plain C++ classes, SQL migrations and a chainable query builder (.where().orderBy().limit()) on top of PostgreSQL.

It needs no runtime reflection and no macros.

C++20 PostgreSQL libpqxx CMake

A chess engine that plays at around 2000 Elo. It searches with minimax, alpha-beta pruning and quiescence search, and orders moves with killer moves, the history heuristic and static exchange evaluation.

Play it on Lichess · Python

A Unix shell written from scratch. It handles pipes, < and > redirection, background jobs with &, quoting, $VAR expansion and command history, plus built-ins like cd, set and history.

C GNU Readline

A web platform for running an academic conference: authors submit papers, reviewers score them, and editors accept, reject or ask for revisions. It has separate roles for each, and exports reports to Excel and PDF.

Java 21 Spring Boot 3 MySQL Docker

A command-line tool for setting up DOMjudge programming contests. I've contributed 2 merged pull requests, about 1,260 lines in total.

Python Typer Pydantic