Romain Marino

Profile

An engineer who loves building things — turning a blank page into something useful, thoughtful, and alive. Three years of software engineering, DevOps and cloud architecture on payment platforms, after four and a half years of full-stack web development.

Experience

Software Engineer Worldline Jan 2023 – Dec 2025

Software engineering, DevOps and cloud architecture on payment platforms — REST & serverless APIs, backends, OAuth / session auth, Stripe payment & subscription flows.

Full-stack Developer APIZR — Lille, France Sep 2018 – Jan 2023

Four and a half years building full-stack web applications, front to back.

IoT Developer GreenMinded 2017 – 2018

Application & web development and embedded-system prototyping.

Education

Master’s degree, Computer Science 2019 – 2021

Faculté de Gestion, Économie & Sciences

Licence STS, Informatique CNAM 2018 – 2019

Bachelor-level year in computer science.

BTS SIO — option SLAM EFFICOM Lille 2016 – 2018

Two-year higher technician diploma — software development.

Music theory — 1^er cycle (1C1) Conservatoire de Roubaix Nov 2024

Formal solfège study — the background behind the Undosus training apps.

Selected Projects

Undosus undosus.com

A family of free, installable, account-free music-training apps — Metronomy (rhythm), Beatsy (tempo), Sightly (sight-reading). Each ships as a single static file: no framework, no build, zero JS dependencies, bilingual, offline-capable.

Static site · PWA · Web Audio API · SVG · vanilla JS

Mealbox mealbox.undosus.com

Recipe manager, meal planner and shopping list as an installable static PWA — no account, no server, all data in the browser. Recipe import from ~24 sites via per-site adapters, photo OCR, optional calendar sync. Trilingual FR/EN/JA.

PWA · Offline-first · Web scraping · vanilla JS

Game jams nahalu.itch.io

Weekend game jams with a small team — three finished games made in Godot (Puppets Runner, Landlord, Alien Abduction), playable in the browser or as Windows / Linux downloads.

Godot · Canvas / game loops · hand-rolled physics

API, backend & payments client work

Production work for clients: REST and serverless APIs, data models and backends, OAuth / session auth, Stripe payment & subscription flows. Mostly under NDA — references on request.

REST · Serverless · Stripe · OAuth / session