Freelancer profile translated to English.

Description

Malt Profile

Fractional CTO | Expert DDD | AI-Native – Complex systems delivered to production

Do you have a critical system to design, technical debt slowing your teams down, or a rewrite to manage without breaking production? For 15 years, I've been helping startups and scale-ups design, develop, and refactor demanding backend platforms (fintech, AI, infrastructure).

My approach: deliver code in production, not just diagrams. Good design is the shortest path to delivery; and I'm hands-on across the entire chain (backend, infra, architecture).

Clients & achievements:

- Leboncoin: 1st P2P payment solution, hexagonal architecture adopted org-wide

- Voodoo: k8s operator for 50+ clusters, formal verification TLA+

- Mansa (regulated fintech): Complete rewrite in 4 months, zero regressions, DDD + fp-ts

- Smartway.ai: CTO 50 engineers, 80% firefighting → 80% features in 1 year

- Weeel: Co-founder, 200+ business rules modeled, from discovery to production

- YourLead.dev: SaaS LLM in production (AI-augmented code review)

- International transport(Talan): 30+ Event Storming workshops

What I deliver: strategic framing & bounded contexts, hexagonal architecture, functional domain modeling, rewrites without regressions, production backend code, cloud infrastructure, Event Storming / Event Modeling workshops, DDD / TDD / FP coaching, LLM agents in well-defined domains.

Tech stack: TypeScript, Node.js, fp-ts, Elixir, Go, Rust, PostgreSQL, Redis, RabbitMQ, Kubernetes, Terraform, ArgoCD, Docker, AWS, GCP, fly.io, LLM APIs

Methodology: DDD, Event Storming, TDD, BDD, property-based testing, ADRs, continuous delivery, pair programming, code review.

Want to discuss? I propose a video call to understand your needs and present a tailored approach.

Response guaranteed within 24 hours.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Weeel
CPTO (co-founder)
RESTAURANTS AND FOOD SERVICE
January 2024 - January 2025 (1 year)
Brest, France
Co-founder CPTO

Context: Greenfield project, built with domain experts from restaurant management.

- Applied DDD from discovery to production with domain experts
- Designed and implemented full platform; event search page aggregates 200+ business rules without issue
- Functional domain modeling in Elixir
DDD Elixir Domain Driven Design
Smartway
Chief Technology Officer
RETAIL (LARGE RETAILERS)
June 2023 - October 2024 (1 year and 4 months)
Brest, France
CTO~50 engineers

Context: Company signed international clients with near-zero error tolerance.

DDD-related Actions:
- Reorganized engineering using Wardley Maps: aligned teams with domain evolution stages
- Introduced explicit ownership boundaries matching domain contexts
- Enabled experts to own their domain and choose the right tools

Impact:
- Dev onboarding dropped from months to weeks through explicit domain boundaries
- Codebase reduced by 40% by eliminating cross-context coupling
DDD Domain Driven Design CI/CD Management DevOps
Mansa - Micro-loan startup
Staff Engineer
BANKING AND INSURANCE
January 2021 - January 2023 (2 years)
Paris, France
Staff Engineer~10 people

Context: Regulated fintech with distributed monolith. Production incidents took weeks to resolve due to ripple effects across unclear boundaries.

DDD Actions:
- Worked closely with compliance and business stakeholders to ensure loan domain models matched regulatory expectations
- Introduced DDD across the company (training + hands-on implementation)
- Stabilized system by isolating loan lifecycle, customer eligibility, and operational concerns into explicit bounded contexts
- Aligned team ownership with bounded contexts critical to credit decisioning and regulatory reporting
- Led full system rewrite with clear bounded contexts from day one

Functional Domain Modeling:
- Strong typing with fp-ts to encode loan rules, eligibility constraints, state transitions at type level
- Property-based testing to validate invariants across loan lifecycle
- BDD for externally visible behavior

Impact:
- Full system rewrite in under 4 months, zero regressions
- Incident diagnosis reduced from multi-day to minutes
- Independent team deployments enabled by explicit context boundaries

*tech stack: typescript (fp-ts), postgresql, rabbitMQ, kubernetes, argoCD, GCP*

DDD Domain Driven Design CI/CD Management Typescript DevOps