Freelancer profile translated to English.
Back to original languageAbout Sacha
I help SaaS editors evolve their platform without stopping deliveries.
Full-stack architect (.NET · React · Kubernetes), 6 years on B2B multi-tenant platforms — retail, healthcare,...
What this looks like in practice:
• Multi-tenancy at scale: designed the backbone of configuration for a white-label SaaS (major European fast-food chains) — onboarding a new client reduced from 1 month to half a day.
• Refactoring without production downtime: led a DDD/Hexagonal architecture migration on a live codebase, POC event-sourced .NET 9.
• Generative AI in production: RAG, agents, MCP — not demos, systems that run. Author of an open-source .NET framework (CQRS/Event Sourcing).
• Growing the team with the code: mentoring, Clean Architecture workshops, team AI adoption.
Service Formats:
Long-term mission (4-5 days/week) — architect/tech lead within your team. This is my primary format.
Short-term reinforcement / expertise (€900/day) — multi-tenancy, event sourcing, LLM integration.
Technical audit (fixed package, from €4,500) — architecture, debt, risks. Scored report + action plan in 2 weeks.
Fractional CTO (on request) — 1-2 days/week for early-stage structures.
French
Native or bilingual
English
Fluent
Can work on-site
Bruxelles (up to 50km), Tournai (up to 50km), Mons (up to 50km), Namur (up to 10km)
Experience
- FLYX CloudTech Lead | Architect | Fullstack Developer (Consultant)SOFTWARE PUBLISHINGNovember 2021 - Today (4 years and 9 months)Brussels, Belgium
Complete technical transformation of a SaaS editor over 4 years.
Migration from a 1 cluster/1 tenant/1 DB architecture to automated multi-tenancy on Kubernetes. Adoption of React across all frontends (kiosks, web, B2B, admin).Creation of the unified design system. Implementation of K8s monitoring. Training and skill development for teams and support for juniors.Result: scalable platform for N tenants, reduced infra costs, autonomous team. - Sassy SolutionsCo-founderSOFTWARE PUBLISHINGJanuary 2025 - Today (1 year and 7 months)Bruxelles, BelgiumDescription**: Design and development of Nexus, a **PaaS platformallowing to **launch a complete SaaS in a few hours**: IAM, billing, messaging, multi-tenancy, AI capabilities. Open-source framework Compendium as a foundation — event sourcing, CQRS, multi-tenant, zero dependencies in the Core, .NET.Distributed architecture on Kubernetes, automated provisioning, AI integration via MCP and Claude Code.Compendium Framework: ~22 packages published on NuGet." + tag RAG and MCP. The rest is good.
- HygieFractional CTO | Architect (Consultant)SOFTWARE PUBLISHINGSeptember 2024 - September 2025 (1 year)Wallonia, Belgium
Took over the technical direction of a nurse billing software to make it a multi-professional health platform.
Implementation of a modular architecture designed to integrate new specialties without breaking everything.Mentoring the technical team, leading architecture reviews, creating technical rituals that didn't exist.Constant alignment between healthcare business needs and architectural choices to ensure maintainability and regulatory compliance.
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Education
- Information TechnologyHELHa — Haute École Louvain en Hainaut2020Bachelor's degree
- Bachelor's degree, DrawingRoyal Academy of Fine Arts and Decorative Arts of TournaiBachelor's degree, Dessin