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Carl Quivron Lille, France Senior Ruby on Rails Freelance Senior Ruby on Rails Freelance Github Twitter
I’m a Ruby on Rails freelance developer focused on B2B SaaS. I help CTOs and founders ship features, reduce technical debt, improve reliability, and evolve the product over the long term.

Freelance experiences

Ruby On Rails - Hotwire oct 2022 → current
Hubflo ⚡️ Hubflo is a B2B SaaS client portal designed to centralize collaboration, communication, and financial workflows. I joined the project during its first year and contributed to building and scaling a large Rails codebase in production. My work focused on core product features such as client portals, form builder logic, custom domains, open banking integrations, email synchronization, and reporting dashboards. Open Banking API Email API (Nylas) Custom domain Form builder Client Portal
Ruby On Rails - React.js mai 2021 → jan 2025
ChooseYourBoss 🤝 ChooseYourBoss is a recruitment platform focused on matching tech and digital profiles with relevant job opportunities. I worked on a long-lived legacy codebase, leading major upgrades such as the migration from Rails 4 to Rails 5 and the transition from Heroku to Google Cloud Platform. My contributions also included improving search and matching logic, refactoring critical parts of the application, and enhancing the overall user experience for both candidates and recruiters. Rails Upgrade Heroku Migration React.js
Ruby On Rails oct 2020 → fev 2021
Willgreen 🚗 Willgreen was an MVP designed to automate the administrative process around driver’s license applications. I was responsible for designing and implementing the subscription system, including Stripe integration, billing flows, and webhook handling. I also contributed to building user-facing features such as dashboards and form integrations required for the core workflow. Stripe API
Ruby On Rails oct 2019 → jul 2020
Rdv-Solidarites 🏥 Rdv-solidarités.fr is a French public service platform designed to improve access to social and healthcare appointments. I joined the project before its public launch and contributed to core features such as the appointment slot finder, waiting queue, and SMS notifications. Working within a public digital product environment, I also learned the importance of measuring feature usage and reliability to continuously improve the service. Sms API Heroku migration to Scaleway
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