Available for new opportunities
Simon Paillassa
Selected Works
Ossau App
Shared outdoor experience application making mountain activities more accessible in the Pyrenees.
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bVision
High-performance monitoring and management platform for road and airport maintenance, providing real-time data visualization and analytics to enhance operational efficiency.
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Sarba
Expense Management Application designed to help employees and administration to manage expenses incurred during working days.
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Full-stack developer with 7 years of experience building web and mobile applications. I work mainly with React, Next.js, NestJS and TypeScript. I'm comfortable taking a project from architecture to deployment. Outside of client work, I co-founded Ossau, a mobile app for the hiking community, built from scratch and now used by 2,000+ people.
Professional Journey
downloadDownload ResumeCo-founder & Lead Developer
Ossau App
Co-founded Ossau, a mobile app for the Pyrénées hiking community with 2,000+ active users. Sole developer working alongside a product co-founder and a UX designer. Built the full stack from scratch: NestJS backend on VPS, PostgreSQL via Neon, Expo/React Native frontend. Core features include trail maps, group social features, real-time notifications, and deep linking for iOS & Android.
Freelance Full-Stack Developer
Independent · Remote
Working independently with European clients on varied projects from internal tooling to enterprise applications. STEF (2024–present): Built a React/Next.js monorepo framework as the technical foundation for all internal web apps, shared component library, RBAC authorization. Boschung (2024): Frontend development on Boschung Web. Extia (2023–2024): React/PWA interfaces, REST APIs, VPS infrastructure, CI/CD with GitHub Actions.
Full-Stack Developer
ITAF.TECH · Bordeaux, France
Full-stack developer on a healthcare ERP serving 70,000+ patients. Feature development and integration across the application, multi-tenant architecture to support multiple international client deployments, i18n implementation, and architectural refactoring with test automation.
Full-Stack Developer
Addeo · Bordeaux, France
Full-stack developer in an e-learning agency, working on a SaaS career development platform. Rewrote the legacy codebase with clean architecture principles, performance optimization and unit testing. Close collaboration with the design team on feature feasibility.