Online Chatou, France
Dan Nutu
Product & Systems Engineer
I design products, and the systems that keep them running.
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Six products online, since March 2026.
And the systems that keep them running.
One engineer. Backed by AI agents.
Six products. Two internal tools. One project in the shadow.
Online bizleen.com
Bizleen
It all starts with a physical card.
I design every card and laser-engrave it myself, in Chatou.
Noble wood, a vector QR code, an NFC chip.
Turn it over.
The QR code works: one scan opens the site.
A scan or an NFC tap: the card deploys the business showcase mini-site, with catalog, booking and hours.
And behind the scenes for the team, the connected ERP.
Bizleen Orbit on tablet and smartphone: NFC clock-in, compliant scheduling, tips and payroll, in fourteen languages.
The public site sells (Bizleen). The connected workspace delivers (Orbit).
- 11 business verticals
- 10 / 14 languages (public & team)
- 40 150 test cases
- 892 400 production lines
Astro 6 SSR · Workers · D1 · R2 · Cloudflare Images · Resend
Online halvyn.app
Halvyn
The couple app that turns conversations into a game.
Compatibility 87% illustration
- 9 languages
- Web, iOS, Android
- 8 mini-games
- Real time
Docker Compose · PostgreSQL 16 · Redis Pub/Sub · Cloudflare R2 · OpenAI · Stripe
Online shortstayguide.com
ShortStayGuide
A city in one, two or three days. In three languages.
Globe points: illustration
An editorial system for multilingual travel guides, with semantic search.
- 343 cities
- 3,087 city guides
- 24,255 published pieces
- 3 languages
@astrojs/cloudflare · Workers AI · Vectorize · D1 · Browser Rendering
Online open source
MagicWindows
Apple’s Magic Keyboard layouts on Windows. Native, free.
A native Windows installer with health checks and a web distribution channel.
- 6 layouts
- 12 native DLLs
- x64 and ARM64
- v0.4.1
Tauri 2.10 · Rust 1.77+ · Cloudflare Workers · R2 (public)
Online npm
PetForge
A companion that grows while you code.
XP bar: illustration
A local progression layer for Claude Code: every session evolves an ASCII creature.
- 18 species
- 52 achievements
- 5 Claude Code hooks
- v3.7.11
Node 20+ · atomic JSON · npm public
Online protected access
Gouvernance
An audit, turned into a decision space.
64 FMEA risks
A risk and architecture audit delivered as an interactive, access-controlled space.
- 4 target architectures
- 5 PDF deliverables
Astro 5.7 (static) · Cloudflare Pages · Worker (lock) · KV (anti-brute-force)
Two internal tools. And one project in the shadow.
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Internal
MeetScribe
Meeting transcription, without the audio ever leaving home.
1,020 tests
Python 3.12 · Local GPU RTX 4070 · FastAPI 0.137 · SQLite / FTS5 · Tailscale
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Internal
Separis
Traceable bookkeeping: an inconsistency blocks the export.
87 tests
Python 3 · Flask 3.0 · SQLite (10 tables) · Tailscale LAN
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In progress
A seventh project is being built. It stays in the shadow until launch.
Where everything runs.
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Cloudflare edge · Workers · D1 · R2
- Bizleen public storefront
- Bizleen Orbit connected workspace
- ShortStayGuide edge · 3 languages
- Gouvernance audit · restricted
- This site Astro · SSR
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VPS · Docker Compose
- Halvyn web · iOS · Android
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Distributed to users
- MagicWindows Tauri · Windows
- PetForge npm · CLI
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Homelab · Proxmox · 3 nodes · 18 guests
Internal: MeetScribe · Separis
- Self-hosted CI
- Prometheus · Grafana
- Deduplicated backups
Remote access over an encrypted mesh · no service port exposed to the Internet
Figures, not adjectives.
- 26,000+ automated tests counted across Bizleen and Bizleen Orbit, MeetScribe, PetForge, Separis and MagicWindows
- 6 products online Bizleen with Bizleen Orbit, Halvyn, ShortStayGuide, MagicWindows, PetForge, Gouvernance
- 7 months since March 2026 of design, delivery and operations, without pause
- 5 pilot venues Bizleen launch cohort, real restaurants
- 24,255 published pages ShortStayGuide, three languages, 343 cities
- 18 isolated environments 5 VMs and 13 containers on a 3-node Proxmox cluster
Spec, plan, blitz, polish.
In short: I define “done” before coding, delegate execution to agents, and answer for the result.
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Spec
clarify, then harden
Understand the user, the business process and the constraints. Write down what “done” means, with the edge cases, the sensitive data and the failure scenarios, before a single line of code.
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Plan
architecture and risk
Choose a proportionate architecture and document the trade-offs. Split the work into numbered, sequential tasks: the architecture is settled before execution, not discovered during it.
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Blitz
execution by agents
Delegate implementation to AI agents working in parallel, slice by slice and end to end: database, API, interface, translations. Every increment ships verifiable.
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Polish and operations
review, production, handover
Demanding review of the produced code, release to production, observation of real behaviour, fast fixes. Then documented procedures, so that someone else can take over.
AI writes a lot of the code. The decisions stay mine.
It does
- Research and prototyping
- Writing code under a specification
- Repetitive tasks
- A first review pass
It does not
- Architecture decisions
- Product trade-offs
- Validation in production
- Responsibility for the outcome
A lab designed to fail cleanly.
- 3 nodes
- 11 TB shared
- 18 guests (5 VMs and 13 LXC containers)
In short: three machines, eighteen isolated environments and tested backups: the training ground for everything else.
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01
Recovery is tested, not assumed
Daily incremental deduplicated backups go to a dedicated server, with retention, integrity verification and restore tests.
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02
Private by construction
Remote access uses an encrypted mesh network. No service port is exposed directly to the Internet; internal routing and TLS are handled by reverse proxies.
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03
A failure mode removed by design
Network shares mount on demand and their mount points are protected. If storage becomes unavailable, writes fail explicitly instead of silently filling a system disk.
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04
Operated as a system
Prometheus, Grafana and dedicated exporters cover node health, memory pressure, volumes and applications. Configuration and incident notes are versioned in Git.
Evidence first, labels second.
In production
- TypeScript · React · Astro
- Node.js · Hono · APIs
- PostgreSQL · D1 · SQLite
- Cloudflare Workers · R2
- Docker · CI/CD
- Authentication · multi-tenancy · GDPR
At the homelab
- Proxmox · VM · LXC
- Network storage
- Deduplicated backups
- Prometheus · Grafana
- Reverse proxy · TLS
- Private mesh network · self-hosted CI
In projects
- Terraform
- Kubernetes
In training
- IAM · access governance
- SIEM · supervision
- Vulnerability assessment
- Pentest methodology · hardening
Training and foundations
- IBM · Coursera DevOps & Software Engineering
- LIORA Cloud Developer Administrator
- LIORA Cybersecurity Administrator In progress
Founder · since March 2026
Let’s talk about a system, a product or a team.
Restaurants, finance, then software through products: I build what I then operate.
My strength is connecting the layers of a system, identifying risk, and going deep where the system requires it.
Read the full storyTell me what already exists, what is not working, and what outcome you are aiming for. Email and LinkedIn are the simplest places to start.
- Join a team
Internship or opportunity to deepen cloud, infrastructure and operations alongside experienced engineers.
- Build a product
Ownership of a full-stack scope, a 0→1 product or a rebuild that needs end-to-end thinking.
- Exchange expertise
Architecture review, open-source collaboration or a focused conversation about a systems problem.
Reply within 48 h on weekdays