Projects

A selection of full-stack projects I've built and shipped end to end. Each one links to its source code or a live demo.

RealMon GO

Full-stack

Location-based nature-observation game · Solo full-stack project · 2025–2026

Java 17 Spring Boot 3 MySQL React Native (Expo) TypeScript OpenAI API iNaturalist API Docker

A Pokémon-GO-style game played in the real world: players photograph plants and animals, a computer-vision pipeline identifies the species, and every catch is geotagged and collected into a personal deck — driving daily quests, in-game coins, a community feed, and push notifications.

Built both halves solo: a multi-module Spring Boot REST API (JWT auth, MapStruct/Lombok, Swagger/OpenAPI contract) and an Expo/React Native client in strict TypeScript, which I migrated from JavaScript mid-project once the API contracts stabilised.
Integrated three external services: iNaturalist for species data and computer-vision identification, OpenAI for AI-generated "creature lore" (cache-aside design so the paid API call runs at most once per species), and Expo Push for notifications dispatched only after the database transaction commits.
Engineered the scan pipeline end to end: camera capture → server-side JPEG recompression to ≤300 KB → CV identification → find-or-create persistence keyed by taxon ID to eliminate duplicate species rows.
Implemented geospatial discovery with Haversine distance filtering, merging local observations with live iNaturalist sightings, and throttled map refetching on the client.
Ran it like a team project: ~30 merged PRs with templates, Dependabot, a Dockerised local stack, Railway deployment, and full technical documentation including an honest security audit with a prioritised remediation roadmap.

Backend repo Frontend repo

DineFlex

Live demo

Restaurant discovery & booking platform · Solo full-stack project · 2025–2026

Java 17 Spring Boot 3 PostgreSQL React 18 TypeScript Vite TanStack Query Tailwind CSS Docker GitHub Actions

A restaurant-discovery and table-reservation platform for Ireland built around Early Bird and Last Minute dining deals: browse and filter venues, check slot availability by date on an interactive calendar, book a table, and receive a confirmation code.

Designed a decoupled production deployment: a Dockerised Spring Boot API on Render (PostgreSQL) and a React/TypeScript SPA on Vercel, bridged by a strict CORS allow-list and a stateless JWT scheme.
Implemented three authentication paths: email/password with BCrypt hashing, a backend-driven Google OAuth2 flow with automatic account provisioning, and a one-click demo login so the live demo works without credentials.
Built the booking engine to consume availability slots server-side as the anti-double-booking mechanism, and documented the remaining race condition with the locking strategies (pessimistic lock / conditional update / unique constraint) to close it.
Established a real test culture: JUnit 5 / Mockito / MockMvc suites across controllers, services, and security components with JaCoCo coverage on the backend, and Vitest + Testing Library specs covering the API layer, interceptors, and key components on the frontend.
Set up CI/CD with GitHub Actions (migrated from Jenkins) and externalised all environment-specific configuration so the same artifacts run locally and in production.

Live demo Backend repo Frontend repo