Hi, my name is
Hadouin Leroy
I build things for the web
I'm a freelance creative dev turning raw ideas into polished products.
Hire me!
About me
Hello! My name is Hadouin LEROY, a creative developer with a strong technical background, shaped by hands-on experience designing and building applications from scratch. I like turning raw ideas into polished, tangible products.
I graduated from ISEP engineering school in Paris (2025), with exchanges at Glyndwr University in Wales (UX design, mobile apps) and Presidency University in Bangalore (management, blockchain). Along the way I worked at Dassault Systèmes, Enoria, JuniorISEP, and now Runelabs.
Today I'm a freelance creative dev, also wearing hats as a UX designer and certified scrum master. Fluent in English, native in French.
My experience
stuff i've shipped along the way
-
Jan 2025 → Now · 1.5 years
Founding Engineer @ Runelabs
Web3 Game Studio
- ▹ Designed Midgard from the ground up, crafting its full UX/UI, logo, brand and 3D assets with a strong gaming identity and mobile-first responsive approach. Helped shape a platform enabling decentralized monetization for indie studios.
- ▹ Led the full frontend development of PonziLand, crafting a polished on-chain game experience at the intersection of gaming and crypto. Partnered closely with the Game Designer to turn gameplay into intuitive, immersive user flows.
- ▹ Built animated landing page experiences, Three.js 3D scenes and Blender assets, then led major rendering optimizations.
- Svelte
- Three.js
- Blender
- Figma
- UX/UI
- Branding
-
Sept 2023 → Jan 2025 · 2 years
Software Engineer · R&D Delmia @ Dassault Systèmes
3D software for industry
- ▹ Led the end-to-end architecture and redesign of a documentation engine, taking it from requirements gathering to production deployment. Defined user needs, selected the technical stack, developed custom plugins, and set up Docker + GitLab CI/CD infrastructure.
- ▹ Owned the integration of a code demo tool in a Product Owner role, coordinating with an international team and applying a user-centered approach across product, UX and technical implementation.
- Docker
- GitLab CI/CD
- Plugins
- Product Owner
- UX
-
Feb 2023 → Sept 2024 · 1.5 years
Tech Lead @ JuniorISEP
Junior Dev Shop
- ▹ Created JE Intervenants, a full Angular PWA combining a user-facing mobile app and an admin dashboard. Designed both mobile and desktop interfaces, led frontend development and structured the project with several collaborators.
- ▹ Technical qualification of bespoke client apps, including projects for Ampère-Renault, assessing feasibility and defining appropriate technical approaches.
- Angular
- PWA
- Frontend
- Scrum Master
- Prototyping
-
Sept 2022 · 6 months
Frontend Dev @ Enoria
ERP / CRM Software
- ▹ Delivered a full UI redesign and UX improvements for a CRM-like management application, making the product clearer, more modern and easier to use. Bootstrap, SCSS and JavaScript in an agile environment.
- Bootstrap
- SCSS
- JavaScript
- Agile
Education
where i trained
-
Paris, France · 5 years
ISEP · Engineering Degree
School coding projects, game dev and hackathons.
-
Wrexham, Wales · 6 months
Glyndwr University · Exchange
UX design courses, mobile app development.
-
Bangalore, India · 3 months
Presidency University · Exchange
Management class, blockchain group project.
My projects
things i've done during my life
-
Midgard
Score-based competitive markets on Starknet. Factory Owners stake on game scores, Challengers pay to beat them, Vault Investors provide capital. Built by RuneLabs.
- SvelteKit
- Svelte 5
- TypeScript
- PostgreSQL
- Drizzle
- Starknet
- Cairo
- Dojo
- TailwindCSS
- Blender
- Three.js
- Threlte
-
PonziLand
Fully onchain, token-agnostic DeFi metagame built on Starknet. A multi-language project with SvelteKit frontend, Cairo smart contracts using Dojo framework, and Rust-based indexer services
- Svelte
- TypeScript
- Cairo
- Dojo
- Rust
- Starknet
- PostgreSQL
-
JE Intervenants
Platform for Junior ISEP to connect alumni and industry experts with student project teams through a browsable expert directory.
- Design Thinking
- UX Research
- Product Design
- Scrum
- Figma
- Notion
- CI/CD
-
Enoria
Collaborative church management application. I conducted the rework of the UI during my internship, now I work there as a freelance to implement new features and resolve bugs
- PHP
- Symfony
- Bootstrap
- twig
- git
-
Deep Trading
End-to-end algo trading platform: backtest strategies on historical data, review Sharpe and equity curves, then deploy live bots with risk guardrails — plus a strategy marketplace. Built on SvelteKit with Alpaca market integration.
- SvelteKit
- TypeScript
- Supabase
- TailwindCSS
- Alpaca API
- Python
- Docker
- Playwright
-
Moodle UX/UI Redesign
Full UX/UI redesign of the Moodle mobile app, reimagining the student experience with a bold dark theme and focused information hierarchy.
- Figma
- UI/UX
- Product Design
- User Research
- Mobile Design
-
Locavore
Mobile app concept and business plan to map French local markets, connecting consumers with producers and merchants through geolocation, smart shopping lists, and an editorial media arm.
- UI/UX
- Branding
- Figma
- Business Plan
-
Emi
Environmental Measures for Industries — a connected vest that tracks workers' health and environment in coal plants, plus a PHP OOP web platform to read live device data, manage workers, and run the community forum.
- C
- Energia
- TIVA TM4C123
- Bluetooth
- Electronics
- TINA
- PHP
- OOP
- MVC
- MariaDB
- Docker
- Figma
- UI/UX
-
LinkMeal
Linkmeal is the application that fights against food waste and student poverty by allowing students to exchange uneaten meals
- ReactNative
- Symfony
- UI/UX
- JavaScript
-
-
Le Jockey Tricolore
Logo rebrand for Le Jockey Tricolore, a French DJ collective specializing in musical animation for events, weddings, and private parties.
- Logo Design
- Rebranding
- Visual Identity
-
Monquiro
Brand identity and logo design for Monquiro, an AI accounting SaaS that automatically imports Gmail invoices and syncs them to Pennylane.
- Logo Design
- Branding
- Visual Identity
-
FreeRoom • Edelweiss
Real-time free classroom finder for ISEP students. SvelteKit full-stack app with Prisma, PostgreSQL and scheduled event ingestion, built with the Edelweiss student association.
- Svelte
- SvelteKit
- TypeScript
- Prisma
- PostgreSQL
- TailwindCSS
- Docker
-
-
-
Guardians of the bookshelves
Guardians of the bookshelves is a game book editor in the terminal. GB also offers you to play the books you create! A class project in groups of 4 over 2 months
- Git
- python
-
Build things with me.
I'm very flexible both in learning quickly different subjects but also in adapting and being empathic to my fellow teammates.