Freelancer profile translated to English.
Back to original languageAbout Gary
⚡ I work with Claude Code Max and AI agents daily, planning, dev, review, tests, docs. You pay for a senior, you get team velocity.
8 years of fullstack development. I co-founded CozyUp (4,500+ hosts, 15,000+ properties), managed up to 10 people, acted as CTO as a Service at Trustiway, and was the sole mobile developer for an app used daily by hundreds of freelancers at Prium.
📈 What this resulted in:
🤖 AI at CozyUp
Layer 1 · Native AI Agent in CozyUp
→ Automatically responds to travelers on behalf of the host
→ Manages operations in natural language (create a product, check its stats, identify frequent traveler requests…)
Layer 2 · MCP Server + Tool Calling
→ Connects CozyUp to ChatGPT & Claude
→ The host manages their platform from their favorite LLM, without opening the app
🔁 Mobile CI/CD → +10h saved/week for the team
⚙️ DB Optimization (queries & indexes) → –50% server usage
✅ E2E test coverage increased to 70% on a critical module
🤖 CozyUp AI Infrastructure → –50% user operational load
🧠 Stack
React.js · React Native · Node.js · Express · TypeScript · Tailwind
PostgreSQL · Redis · BullMQ · CI/CD · GitHub Actions · Fastlane
🤖 AI & LLM
AI Agent · MCP Server · Tool Calling · LLM Integration
Claude API · OpenAI API · Agentic Workflows · RAG
👉 Have a product to build, scale, or connect to AI? Let's talk about your project.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Nantes (up to 50km), Lyon (up to 50km)
Experience
- CozyUpCo-founder & CEOSOFTWARE PUBLISHINGJanuary 2022 - Today (4 years and 6 months)Delaware, United States
CozyUp is the AI platform for short-term rental hosts (Airbnb, Booking.com..)
As co-founder and lead developer, I managed the entire technical development from scratch to several thousand active hosts across 15,000+ properties.What I built:- Web & mobile application (Vite.js, react-native, Next.js) from conception to production- Customizable online store system: additional services, product management, partners, and commissions- Automated payments and invoicing with Stripe (manual capture, security deposits, renewals, releases)- Mobile CI/CD pipelines with Fastlane & GitHub Actions- E2E test coverage increased to 70% on critical modules- DB Optimization (queries & indexes) → –50% server usageAI Infrastructure — what we've built recently:- Layer 1 · Native AI Agent: automatically responds to travelers and manages operations in natural language (create an offer, modify a product, view stats…) → –50% operational load for hosts- Layer 2 · MCP Server + Tool Calling: connects CozyUp to ChatGPT & Claude — the host manages their platform from their favorite LLM, without opening the appTechnologies:React.js · Shadcn · React Native · TypeScript · Tailwind · Node.js · Express · PostgreSQL · Redis · BullMQ · Stripe API · Vitest · Playwright · Fastlane · GitHub Actions · Firebase · Claude API · OpenAI API · MCP · Tool calling · RAG · react-query · Redux - Trustiway GroupeCTO ConsultantBANKING AND INSURANCESeptember 2024 - May 2025 (8 months)Paris, France
Description
At **Trustiway**, a **credit and insurance brokerage**, I held a hybrid role combining technical oversight, product management, and team leadership.My main responsibilities:• Structuring and **managing the product roadmap**, directly aligned with business objectives•Writing functional and technical specificationsto ensure clear and efficient execution• Implementing theAgile Scrummethodology: sprint management, ceremonies, task prioritization, KPI tracking• Mentoring and collaborating with two senior developers•Recruitingan additional developer to support project scaling• Optimizing technical and organizational processes to improve team productivity• Acting as the interface between tech, product, and stakeholders to ensure overall coherence• Occasional development contributions to support the team on specific needsThis role allowed me to leverage my **dual technical and entrepreneurial profile**, while supporting Trustiway in its product and technical structuring.Technologies:
React.js, Minimal UI, Node.js, Strapi, Stripe, MongoDB, MySQL, TypeScript, Gitlab Pipeline, Docker, Linear, Scrum - Prium SolutionsReact/React-Native DeveloperSOFTWARE PUBLISHINGOctober 2021 - September 2024 (2 years and 11 months)Paris, France
Description:
For 3 years, I worked within the Prium group, a major player in payroll outsourcing, supporting thousands of independent workers.As the lead (and sole) React Native developer, I was responsible for the development, continuous improvement, and stability of the PriumOne mobile application, used daily by employees to manage their professional activities.My main responsibilities included:• Development and deployment of new strategic features for the application• Performance optimization and continuous improvement of the user experience• Proposing designs and technical architectures for major evolutions• Setting up continuous integration pipelines with Fastlane and GitHub Actions, facilitating pre-production deliveries and the QA process• Configuration and writing of unit tests (Jest) and end-to-end tests (Detox) to ensure product robustness• Integration of push notifications via OneSignal• Project tracking using Scrum methodology• Regular publications on the App Store and Google Play StoreThis experience allowed me to strengthen not only my technical skills but also my ability to manage a mobile project from start to finish, entirely autonomously.Technologies:
React.js, React Native, TypeScript, Tailwind, Jest, Fastlane, GitHub Actions, Recoil, React Query, React Hook Form, Spraypaint.js, Detox, Flipper, OneSignal.
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Education
- Master BioinformaticsUniversities of Bordeaux2018Face à l'ère des Big DATA des données biologiques, l'automatisation des processus ne peut se faire que grâce à l'utilisation de langages de programmation et à la maitrise de l'algorithmique. C'est pourquoi, le master de Bioinformatique de Bordeaux, France combine les domaines des Sciences de la Vie et de l'informatique. Les principaux objectifs sont de donner aux étudiants une formation approfondie et interdisciplinaire en bioinformatique et en bio-analyse permettant de travailler dans les secteurs public ou privé dans les domaines de l'agronomie, l'environnement, la santé ou l'industrie pharmaceutique. Apprentissage de la programmation informatique (Python, Java, Perl, C) afin d'utiliser la puissance de calcul des ordinateurs pour réaliser des analyse Big Data. Développement de programme d'analyse de Big Data issues des expériences de laboratoires de recherches, analyse médicales, laboratoires pharmaceutiques, etc). Développement de différents programme à partir des technologies suivantes: - Python - Java - JavaScript - Perl - C - HTML5 - CSS3 - Bash Environnement: Linux OS https://master-bioinfo-bordeaux.github.io/
Certifications
- JavaAJC Inginierie2019
- React.jsPluralsight2019