The helmsman — the one who reads the wind, holds the course, and keeps the ship on track.
Approach
How I work
I embed in your team, understand your domain, and ship production-ready code. No hand-off friction — I take features from architecture to deployment, with clean code and clear communication at every step.
Architecture & Clarity
I help you make solid technical choices. Data modelling, API contracts, system design — I bring the expertise so your team can move fast with confidence.
End-to-End Delivery
From requirements to production, I deliver complete features. You stay in control of the roadmap — I make sure what ships is clean, tested, and shipped on time.
Your Stack, Your Team
I adapt to your tools, your processes, and your people — but I value pair programming over solo silos, pair reviews over async back-and-forth. Direct collaboration is where the best work happens.
Security by Design
Security is not an afterthought. OAuth with server-only cookies, strict CSP with nonces, XSS prevention, least-privilege permission models — I bake these in from day one. I maintain ongoing CVE watch on sensitive dependencies and treat security hygiene as a first-class engineering concern.
Stack & Practices
How I Build
Clean Architecture
Hexagonal architecture, dependency injection, clear boundaries between domain and infrastructure. Code that’s easy to test, extend, and hand off.
Quality-Driven
BDD and TDD aren’t buzzwords — they’re how I make sure what I ship actually works. Tests document intent, catch regressions, and give your team confidence to change things. Pair reviews over async back-and-forth.
Product Thinking
I take the time to understand your domain deeply before writing a line of code. Good engineering starts with the right questions, not the fastest keyboard.
AI-Augmented
I use Claude Code and AI coding tools daily — not as a crutch, but as a multiplier. I know how to prompt, review, and steer AI output to ship faster without sacrificing quality.
Experience
Track Record
Tmonier SRL
FounderFounded Tmonier SRL to bring senior full-stack engineering and AI expertise to ambitious product teams — as an independent consultant.
Aware
EmployeeSenior Full Stack Developer
Data-sharing platform for food industry groups and supermarket chains to exchange and process operational datasets across 4 European markets.
- ▶ Built frontend and backend services around hexagonal architecture principles, with a strong emphasis on type-safety and functional programming
- ▶ Designed an ETL framework enabling the team to create and maintain 300+ bronze/silver/gold Medallion pipelines — clean architecture, dependency injection, and automated data quality checks
- ▶ Built an embedded DuckDB ETL system directly in the backend — with observability, DX-friendly tooling, and auto-refresh — reducing analytics load times by up to 100× across all pages
- ▶ Mentored developers and fostered a culture of ownership, knowledge sharing, curiosity, and quality across the team
- ▶ Owned dependency health: drove major version upgrades across the stack, led the CJS → ESM migration, ran tech watch, and tracked CVEs to keep the stack secure and current
- ▶ Managed cloud infrastructure; set up CI/CD with automated testing and Databricks deployment pipelines
Proxyclick
EmployeeFull Stack Developer
SaaS visitor management platform serving enterprise clients across 100+ countries.
- ▶ Worked within a microservices architecture with event-driven inter-service communication via Apache Pulsar
- ▶ Rewrote the entire billing and self-service system — module subscription flows, payment integration, and account management
- ▶ Designed and built an event-based automation engine (IFTTT-style) to simplify the management and customisation of complex visitor workflows
- ▶ Led a progressive frontend modernisation — migrating legacy AngularJS modules to a modern typed stack
Emisys
EmployeeFull Stack Developer
Event management application used by major Belgian festivals.
- ▶ Developed ticketing and scheduling features
- ▶ Implemented payment and refund systems — transaction processing, cancellation flows, and financial reconciliation for festival operations
- ▶ Maintained a platform serving thousands of concurrent users during live festival events
mPhase
EmployeeFull Stack Developer
Water treatment logistics tool for Montreal municipal operations.
- ▶ Built the full application from scratch — sole developer, end-to-end ownership from data model to UI
- ▶ Designed geolocation-based routing and scheduling system
- ▶ Architected a generic form DSL — a declarative schema-driven engine letting field technicians build and customise their own inspection forms without touching code
Extia
Employee↳ mission @ Taktik
Full Stack Developer
Software platform delivering personalized experiences through IPTV and digital signage solutions.
- ▶ Built monitoring dashboards and alerting systems
- ▶ Maintained the high-throughput media backend handling video and multimedia stream distribution across the IPTV infrastructure
- ▶ Implemented real-time data visualization on the frontend dashboard
Extia
Employee↳ mission @ Bewan
Full Stack Developer
CRM and event management platform for a digital transition expert in the hospitality industry.
- ▶ Built CRM features and event management modules
- ▶ Built Diserv from scratch — a metric collection and storage platform (InfluxDB) with a flexible billing engine supporting flat-rate plans, overage-based pricing, and per-metric charging
IoTFactory
InternFull Stack Developer
Bluetooth/LoRa IoT gateway for on-site asset tracking.
- ▶ Deployed on Raspberry Pi gateways with a local-first architecture — data persisted on-device and automatically reconciled with the backend when connectivity was restored
- ▶ Implemented geofencing and indoor geolocation via Bluetooth beacon triangulation for precise asset positioning in GPS-denied environments
- ▶ Built device management dashboard and monitoring tools
- ▶ Set up a captive portal for frictionless WiFi onboarding of new devices on-site
Bachelor in Computer Science
AI specialisationReferences, work samples & credentials available on request.
Projects
Side Projects
Vigie
↳ Tmonier
Local-first AI agent supervision — real-time monitoring, loop detection, human-in-the-loop control over Claude Code. Built with Bun daemon, Hono + Effect-TS, TanStack Start, PostgreSQL.
Autonomous Bar
Full self-service bar system: orders, inventory, accounting, referral engine, RFID cards (IoT), photobooth, cocktail machine, real-time BI dashboards.
Flagship Project
vigie
/vi.ʒi/ — the lookout in the crow's nest
Eyes on the horizon.
A local-first supervision layer for AI coding agents. Real-time visibility into agent activity, loop & drift detection, token cost guardrails, checkpoints & rollback. Your AI writes the code — you keep the helm.
About
Behind the keyboard
I'm Damien — a curious tinkerer since the days I was dismantling every piece of electronics at home (sorry, Mom). 31 years old, married to the wonderful Clara who tolerates my late-night coding sessions, and proud dad to Basile who already beats me at board games.
What drives me is the craft. Part of the SoCraTes Belgium community, I believe great software is about clean design, tight feedback loops, and the discipline to keep learning. TDD, pair programming, continuous refactoring — that's how I sleep at night knowing my code won't wake anyone up at 3 AM.
The rise of AI in development? Fascinating — but when agents write code unsupervised, things drift fast. Context window limits, hallucinated logic, quality erosion. That's why I built Vigie: the more powerful our tools, the more we need control. When I'm not coding, you'll find me losing at Terraforming Mars or chasing whatever shiny tech caught my eye.
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