Freelancer profile translated to English.
Back to original languageAbout Bertrand
Senior Fullstack Web Developer | Tech Lead | CTO ● MVP & ERP & SaaS
Are you developing an ERP or SaaS and need reinforcement tomodernizeyour codebase, develop **new features**, or launch an **MVP**?
I have been developing and modernizing critical business applications for over 15 years; online payment, invoicing, activity monitoring; for SaaS publishers with 20,000 to 100,000 users.
My typical interventions:
→ **Progressive refactoring of legacy systems**: non-disruptive migration, test implementation, incremental refactoring, reduction of technical debt
→ **Development of new SaaS features**: invoicing, dashboards, multi-tenant management, REST API
→ **MVP creation**: from scoping to production, architecture designed for scaling
✨ What sets me apart
I am **autonomous from A to Z**: scoping, development, testing, deployment, documentation
I **deliver maintainable code**: hexagonal architecture, DDD, automated tests
I integrateAIinto my daily workflow: Claude Code, agents, skills, MCP to deliver faster without sacrificing code quality
🛠️ Main Stack
Backend:TypeScript, Node.js/NestJs, PHP, Symfony
Frontend:TypeScript, Vue.js/Nuxt.js, Ember.js, React.js
API:REST, SOAP, design/integration
Infrastructure:Docker, CI/CD (Jenkins, GitLab, GitHub), RabbitMQ, Redis, Solr, VPS
Architecture:Clean Architecture, Hexagonal Architecture, Clean Code, SOLID principles, DDD, KISS, YAGNI
Test Automation:unit, integration, and end-to-end
UX/UI:responsive, ergonomics, accessibility (RGAA / WCAG)
Extension Development:Chrome / Firefox
🤝 Modalities
- Smooth communication 💬
- Regular deliveries 📦
- Remote first 🏡
French
Native or bilingual
English
Fluent
German
Basic
Remote only
Primarily works remotely
Experience
- VovooCTO - Founding EngineerAUTOMOBILEMarch 2026 - Today (5 months)Lille, FranceDevelopment and maintenance of a B2B SaaS platform for automotive professionals for the digitalization of used vehicle trade-ins (inspections, estimates, reports).🎯 Configurable inspection form engine by organization🎯 AI Integrations (GPT-4o): license plate recognition, reliability analysis, recommended maintenance, defect detection and localization in photos, predictive maintenance🎯 Multi-tenant management: organizations, roles, credits, Stripe billing👉 Main tasks- Definition of technical architecture and stack choices- Third-party integrations: Autobiz (vehicle data), MyTracks (price estimation), Mailjet (transactional emails + webhooks), Stripe (payments), INSEE (SIREN/SIRET), OpenAI (GPT-4o vision)- Implementation of offline mode / PWA (IndexedDB, synchronization queue, mobile photo capture)- Technical debt management👉 StackTypeScript, NestJS 10, TypeORM, PostgreSQL 16, MinIO (S3), Passport JWT, class-validator, pdfMake, Next.js 14 / React 18 (client), Next.js 15 / React 19 (admin), Tailwind CSS, shadcn/ui, Radix UI, React Hook Form + Zod, Redux Toolkit, Capacitor, PWA (@ducanh2912/next-pwa), Recharts, Monaco Editor, Docker, OpenAI GPT-4o, Mailjet, Stripe, Twilio👉 Best practicesModular architecture, Domain Driven Design, Clean Code, SOLID, KISS/YAGNI, multi-tenant, security👉 TeamSmall early-stage team in direct contact with the CEO on product strategy and partnerships
- ObatSenior Fullstack DeveloperSOFTWARE PUBLISHINGJanuary 2026 - Today (7 months)Dunkerque, FranceDevelopment and maintenance of new features on a SaaS ERP for construction professionals (~20k users).🎯 Customer and supplier contact management with professional directory🎯 Project tracking (planning, progress, associated documents)🎯 Payment failure management: access maintained for 30 days with automated reminders, payment retry with 3DS management, suspension at D+31 and accounting credit note at D+61: estimated reduction in involuntary churn of ~€30k MRR/year recovered👉Main tasks- Migration of legacy code- Quoting and specification of new features in collaboration with POs- Backend and frontend development- Performance improvements: cache management, query optimization- Test automation (unit, integration, e2e)- Code reviews to ensure maintainability and adherence to best practices👉StackPHP 7.4 and 8.4, Symfony 5.4 and 7.3, PHPUnit, ApiPlatform, Symfony Messenger, Twig, React 18.2, RabbitMQ, Redis, Mercure, MariaDB, REST API, Docker, GitLab, SonarQube, PHPStan, Datadog👉Best practicesHexagonal Architecture, Domain Driven Design, microservices, agile methodology (Kanban)👉Team6 developers, 1 tech lead, 1 QA, 1 PM
- FreelanceSenior Fullstack DeveloperSOFTWARE PUBLISHINGJuly 2025 - Today (1 year and 1 month)Dunkerque, FranceCreation from scratch of a multi-tenant content management system (CMS) application allowing management of several client sites from a single administration interface.🎯 JWT authentication system with refresh tokens🎯 Multi-tenant management with strict data isolation per client🎯 User management with granular permissions and profile management🎯 Hierarchical tree structure for page management🎯 Dashboard with statistics and KPIs per tenant🎯 Multi-tenant public-facing section with dynamic routing👉Main tasks- Backend and frontend development- Test automation (unit, integration, e2e)- VPS administration and deployment automation👉StackTypeScript, NestJS, Vue.js 3, Nuxt 4, MariaDB, REST API, Prisma, Zod, Pino, ESLint, Prettier, Stylelint, Husky, shadcn/ui, TailwindCSS, JWT, PNPM Workspaces, GitHub👉Best practicesHexagonal Architecture, Domain Driven Design
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Education
- Master in Free Software EngineeringUniversité du Littoral - Côte d'Opale2008
- Licence Génie Mathématiques et InformatiqueUniversité du Littoral - Côte d'Opale2006