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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Full Stack Developer (RoR & React Native) - **Company:** Kolsquare - **Location:** Paris, France (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Software Quality, Code Review, Data Sharing, Data Synchronization, Payment Systems, Monitoring of Systems, OAuth, Ruby, ReactJS, Delivery Pipeline, Stripe, Enterprise Integration, React Native, Webhooks, Web Api - **Published:** July 5, 2026 - **Apply:** https://fr.indeed.com/viewjob?jk=3b79da8129c64082 ## About the Role * You have a minimum of 3 years of experience in Ruby / Rails, and relevant experience with React (preferably Native) * You enjoy shaping the technical direction of early-stage projects and laying down a robust foundational architecture * You are autonomous, organized and proactive, with demonstrated ability to prioritize and manage multiple projects in a fast-paced environment * You know how to leverage AI to optimize your output, in terms of quality and quantity * You are empathetic and you love working with people from different backgrounds * You have excellent communication skills, with the ability to collaborate effectively across teams * You are fluent in English ## Description We are building a new B2C product for the next generation of content creators, and we need a strong technical partner to make it happen. As a Senior Full Stack Developer, you will work hand-in-hand with the your Development colleagues, Product Designer and Product Marketing Manager to design, build and ship a product that creators love to use - across web and mobile., Together with your Development colleagues, Product Designer and Product Marketing Manager, you will be responsible for the technical execution and quality of this new B2C product: * Full Stack Development: Build and maintain features end-to-end - from Rails API endpoints and background jobs to React Native screens and components - ensuring a seamless experience across iOS and web. * Architecture & Code Quality: Contribute to architecture decisions, advocate for simplicity and maintainability, and uphold high standards through code reviews, testing and clean abstractions. * Platform Integrations: Work with social media APIs (Instagram, TikTok, Facebook), payment systems (Stripe) and third-party services, handling OAuth flows, webhooks and data synchronization reliably. * Infrastructure & Deployment: Participate in our deployment pipeline (Kamal on GCP), background job processing, monitoring and observability - keeping the product stable and performant in production. * Cross-Functional Collaboration: Work closely with product and design to turn user needs into technical solutions, synchronize with the broader Kolsquare engineering team to leverage shared data and mutualize features when possible., * You are a passionate person and you have determination to reach any goal * You are curious and want to learn, improve and gain responsibility * You want more than just a job! Kolsquare is a benefit company, with a general ambition that goes beyond our profitability goals: positively impact the world, * Be Responsible in your actions * Pursue Growth & Learning * Be passionate and determined * Share your Power, Knowledge & Wealth * Build Authentic relationships We cultivate a culture of inclusion for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team - one that makes better decisions, drives innovation, and delivers better business results. ## Related Videos - [Navigating Growth, Scaling Challenges, and Office Expansions with David Singleton, CTO at Stripe](https://www.wearedevelopers.com/videos/100362-navigating-growth-scaling-challenges-and-office-expansions-with-david-singleton-cto-at-stripe) - [Coffee with Developers: David Heinemeier Hansson](https://www.wearedevelopers.com/videos/875-coffee-with-developers-david-heinemeier-hansson) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [Keeping applications secure by evolving OAuth 2.0 and OpenID Connect](https://www.wearedevelopers.com/videos/100152-keeping-applications-secure-by-evolving-oauth-2-0-and-openid-connect) - [Coffee with Developers](https://www.wearedevelopers.com/videos/354-coffee-with-developers) - [Coroutine explained yet again 60 years later](https://www.wearedevelopers.com/videos/690-coroutine-explained-yet-again-60-years-later) ## Related Articles - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [The 7 Most Popular Backend Frameworks for Developers](https://www.wearedevelopers.com/magazine/403-the-7-most-popular-backend-frameworks-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)