Freelancer profile translated to English.
Back to original languageAbout Jonathan
I oversee every iteration of your mobile application: audit, scoping, writing specifications, design, development, testing, and deployment on app stores.
I am involved in the entire product cycle, from ideation to growth: performance monitoring (onboarding, retention, engagement), bug tracking, data-driven iterations, and continuous improvement.
My approach is focused on rapid and clean delivery: short cycles, frequent deployments, continuous visibility on progress, and quick field feedback to align the product closely with real-world usage.
As a full-stack developer at heart, I also handle the application's backend to ensure consistency, performance, and scalability.
In practice, I combine development, product management, and project management.
French
Native or bilingual
English
Fluent
Spanish
Conversational
Can work on-site
Paris (up to 50km), Strasbourg (up to 50km), Lyon (up to 50km), Montpellier (up to 50km)
Experience
- SaleslinkMobile Fullstack DeveloperCIVIL ENGINEERINGFebruary 2024 - February 2026 (2 years)Dallas, United StatesContextSaleslink is a mobile application for construction companies, enabling sales reps, workers, tradespeople, and project managers to prospect, manage their projects, and produce operational indicators.MissionI worked as a Mobile Fullstack Developer on two major phases:1. Maintenance and evolution of an existing React Native application.2. Complete refactoring of the application with a robust and scalable architecture.Features- Construction site data management: KPIs, pipelines, pin/lead/project escalation.- Component optimizations: reducing re-renders, improving fluidity on Android.- Modular architecture: separation of UI, business logic, and services (use cases / gateways).- Supabase Backend: multi-tenant, advanced RLS, granular permissions.- Database-level business logic: triggers, PL/pgSQL routines, scheduled jobs.- Realtime & Background tasks: subscriptions, resumable uploads, event handling.- Geoqueries & Clustering: visualizing projects on a map.- Performance optimization: dedicated SQL functions to avoid line-by-line RLS rule evaluation.Technologies- Frontend: React Native, Expo 54, Redux Toolkit, Gluestack-UI-v3- Backend: Supabase, PostgreSQL, PL/pgSQL- Tools: React DevTools, React Native Profiler, SentryImpact- Centralization of field data: tracking sales opportunities and projects.- Reliable indicators: production of KPIs for supervisors.- Access management: organization of teams and appropriate permissions.- Scalable architecture: rapid feature delivery, maintained maintainability and performance.
- DataLegalDriveBackend Node.js / Typescript DeveloperLEGALJanuary 2024 - Today (2 years and 4 months)Paris, FranceDataLegalDrive is the leader in compliance solutions for companies regarding anti-corruption and transparency laws, GDPR, and SAPIN II.Main objective:Customer data migration.Key achievements:- Development of import scripts written in Typescript on a Node.js backend.- Reading Excel files containing processing lists using XLSX.- Generation of a JSON representing the modifications to be made in the database.- Generation of an error report to handle inconsistent data.- Addition of collected processing data to the MongoDB database.- Thorough verification of import quality.- Design of a new data reading and field assignment engine.
- France TélévisionsFrontend React DeveloperPRESS AND MEDIAFebruary 2024 - February 2024Study and prototyping of a web video player for TF1.Key achievements:- Analysis of technical debt related to an ActiveX plugin used for video playback.- Design of a React-based web video player using Video.js.- Development of a minimalist demonstration site to test integration.- Performance of playback and stream conversion tests with VLC and FFmpeg.- Documentation of broadcast network streams (UDP / TCP).- Study of technical solutions to make these streams usable in a browser (conversion server, browser extension, desktop application).
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Education
- Master's Degree in Computer ScienceUniversity of Grenoble2018- Développement d'interface en Java - Création des fonctions principales d'un système d'exploitation en C - Mise en place de routeurs en réseaux - Apprentissage par des cas concrets de la gestion et de la conception de projet - Ecriture d'algorithmes comparés - Introduction à la cryptographie - Illustration d'approches ergonomique et intuitive
- Bachelor's Degree in Life SciencesUniversity of Strasbourg2017Spécialité Biologie Cellulaire et Physiologie de Organismes