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