Frontend / Product Developer
Guillaume Dumas
React/Next.js, TypeScript, APIs and real-time web apps, with enough backend awareness to understand the whole flow.
About
Frontend developer from Grenoble, trained at 42 School Lyon after a first career in high-end leather craft.
I like turning complex product flows into clear, readable interfaces that feel easy to pick up.
I care about details and the small defects users feel before they can describe them.
Experience
Jupiter
Early 2026
Frontend Consultant - Remote
Frontend work on Jupiter Predict, a live market product inside a large React and TypeScript codebase.
- Reworked activity, For You, live option and leaderboard screens.
- Improved chart behavior, payment UI and desktop/mobile states.
Adrena
Late 2025
Frontend Intern - Remote
Joined a trading product team and shipped roughly 30 merged PRs across UI, swaps and optimized API work.
- Reworked trading UI, token selector, staking leaderboard and ALP screens.
- Integrated Jupiter swaps, campaign UI and mobile layout fixes.
Versus
2024 - 2025
Founder & Developer - Remote
Built a real-time betting product around live AI fighting matches. Public testing: 100+ testers, around 100 SOL in total volume.
- Owned the Twitch scraper, oracle and monorepo work.
- Handled timing bugs, invalid matches, refunds and payout logic.
42 Lyon
Late 2023 - Mid 2025
Common Core Graduate - Lyon, France
Completed the peer-reviewed 42 Common Core through low-level, systems and web projects.
- Built projects in C, C++, Unix, networking, graphics and Docker.
- Finished ft_transcendence: a Pong platform with multiplayer tournaments in a TypeScript SPA.
Magicake & Doge Capital
2021 - 2024
Founder, Board Member
Built product, community and strategy experience around digital projects and online communities.
- Handled communication, operations, business development and strategic decisions.