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Firmin G.FG

Firmin G.

Staff TypeScript React Node – SaaS & Remote

€750/day
1 project
Paris, FR
8-15 years

Average response time: 1 hour

About Firmin

Expert fullstack JS pour développement complet et hosting de solution applicatives web (React) et mobile (React Native) server (Node) et database (SQL). J'apporte une expertise en développement agile et communique le plus clairement possible comment obtenir une vision la plus proche possible du produit souhaité.
  • French

    Native or bilingual

  • English

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • PhantomBuster
    Staff Engineer (TypeScript · Automation, AI & Data Platforms)
    SOFTWARE PUBLISHING
    October 2024 - July 2025 (9 months)
    Paris, France
    ➔ Lead development of scalable automation and data-extraction tools using a TypeScript-first full-stack architecture (Node.js backend, React/Next.js frontend), improving developer velocity and platform reliability.
    ➔ Designed and maintained robust scraping workflows and internal APIs that power automated data pipelines across LinkedIn, Instagram, Twitter, and other platforms, delivering structured data for analytics and CRM workflows.
    ➔ Built and optimized multiple headless scraping & automation modules (including LinkedIn Profile & Job Scrapers), balancing performance, error handling, and safety limits with external platforms’ constraints.
    ➔ Integrated AI-assisted tooling to enhance data enrichment, lead scoring, and outreach workflows, enabling more contextual automation while maintaining API efficiency.
    ➔ Collaborated cross-functionally with product, QA, and infrastructure teams to deploy new features, monitor operational KPIs, and mitigate scraping throttling/safety events.
    ➔ Championed best practices in type-safe codebases, CI/CD pipelines, and observability to reduce runtime incidents and improve dev onboarding.
    Typescript intelligence artificielle Infrastructure React.js Web Scraping
  • bip and go
    Expert React Native
    TRANSPORTATION
    September 2023 - October 2024 (1 year and 1 month)
    Paris, France
    – Responsable du développement et de l’évolution de l’application mobile principale en React Native, assurant une expérience fluide et performante pour des milliers d’utilisateurs quotidiens.
    – Conception et implémentation de fonctionnalités complexes : géolocalisation en temps réel, gestion d’abonnements et de paiements, intégrations avec des APIs backend robustes, et optimisation des flows utilisateurs pour la mobilité.
    – Mise en place de bonnes pratiques techniques (architecture modulaire, tests unitaires & E2E, CI/CD), réduisant les bugs en production et accélérant les cycles de release.
    – Collaboration étroite avec les Product Managers, UI/UX Designers et Backend Engineers pour transformer les besoins business en solutions techniques scalables.
    – Supervision du refactoring de composants clés pour améliorer la maintenabilité, la performance et la réutilisabilité du code à l’échelle de l’application.
    – Mentorat auprès des développeurs plus juniors, conduite de revues de code et diffusion de standards React/TypeScript dans l’équipe.
    – Optimisation des performances applicatives (temps de démarrage, consommation mémoire, interactions fluides) pour garantir une expérience mobile premium.
    React Native Firebase iOS Android
  • Manutan
    Technical Lead
    RETAIL (LARGE RETAILERS)
    January 2023 - September 2023 (9 months)
    Paris, France
    In charge of leading the total revamp of Manutan's ecommerce websites. Some of our key challenges:

    ➔ Creating a common design-system for different websites sharing a generic frame (handle theming)
    ➔ Handle localization
    ➔ Re-use backend logic between websites

    Technical Stack: Contentful, Storybook, React, Nextjs, Ansible, Kubernetes, Azure devops
    Storybook Contentful DevOps React.js Architecture SI

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Education

  • Fullstackopen - Deep Dive Into Modern Web Development, Computer Science
    University of Helsinki
    2019
    Fullstackopen - Deep Dive Into Modern Web Development, Computer Science
  • Diplôme de Comptabilité et de Gestion - Formation accélérée
    IAE Bordeaux
    2010
    Diplôme de Comptabilité et de Gestion - Formation accélérée

Skill set

Categories