Freelancer profile translated to English.
Back to original languageAbout Firmin
Expert fullstack JS for complete development and hosting of web (React) and mobile (React Native) applications server (Node) and database (SQL). I bring expertise in agile development and communicate as clearly as possible how to achieve a vision as close as possible to the desired product.
French
Native or bilingual
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- PhantomBusterStaff Engineer (TypeScript · Automation, AI & Data Platforms)SOFTWARE PUBLISHINGOctober 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.
- bip and goExpert React NativeTRANSPORTATIONSeptember 2023 - October 2024 (1 year and 1 month)Paris, France– Responsible for the development and evolution of the main mobile application in React Native, ensuring a smooth and performant experience for thousands of daily users.– Design and implementation of complex features: real-time geolocation, subscription and payment management, integrations with robust backend APIs, and optimization of user flows for mobility.– Implementation of good technical practices (modular architecture, unit & E2E tests, CI/CD), reducing production bugs and accelerating release cycles.– Close collaboration with Product Managers, UI/UX Designers, and Backend Engineers to transform business needs into scalable technical solutions.– Supervision of the refactoring of key components to improve maintainability, performance, and code reusability at the application level.– Mentoring junior developers, conducting code reviews, and disseminating React/TypeScript standards within the team.– Optimization of application performance (startup time, memory consumption, smooth interactions) to ensure a premium mobile experience.
- ManutanTechnical LeadRETAIL (LARGE RETAILERS)January 2023 - September 2023 (9 months)Paris, FranceIn 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 websitesTechnical Stack: Contentful, Storybook, React, Nextjs, Ansible, Kubernetes, Azure devops
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Education
- Fullstackopen - Deep Dive Into Modern Web Development, Computer ScienceUniversity of Helsinki2019Fullstackopen - Deep Dive Into Modern Web Development, Computer Science
- Accounting and Management Diploma - Accelerated TrainingIAE Bordeaux2010Diplôme de Comptabilité et de Gestion - Formation accélérée