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Engineering a Multi-Tenant B2B SaaS from Product to Infrastructure.
Designed and built a production B2B SaaS end-to-end, covering backend architecture, multi-tenancy, infrastructure, security, integrations and mobile expansion.
The project : CoutureCiel is a multi-tenant B2B SaaS platform built for tailoring workshops to manage their customers, measurements, orders, inventory, finances and day-to-day operations.
As the sole engineer and CTO, I designed and built the system across the full engineering lifecycle — from product architecture and data modeling to production infrastructure and operations.
- Designed the multi-tenant application and data architecture
- Built core business workflows for orders, measurements, inventory, accounting and customer management
- Implemented granular roles, permissions and subscription quota enforcement
- Integrated WhatsApp Cloud API and transactional SMS for operational notifications
- Designed CI/CD and production deployment workflows
- Built and operated the self-hosted infrastructure
- Implemented monitoring, incident response and infrastructure cost optimization
- Designed a Zero Trust model for sensitive internal administration
- Extended the existing platform architecture toward React Native / Expo mobile applications
My role : Architecture • Backend Engineering • DevOps • Infrastructure • Security • Integrations • Technical Product Engineering
Stack : NestJS • Next.js • Docker • Dokploy • Cloudflare • WhatsApp Cloud API
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