Developer-first SaaS API for EU VAT validation via VIES with Redis caching, change monitoring, and webhook notifications.
Senior Full-Stack Engineer
I have been building software for 25+ years, from PHP and MySQL to TypeScript, Python and production AI systems. I work hands-on from architecture to production, and I stay with a system after it ships.
Who I am as an engineer
For 12 years I was the only person responsible for the technology of a logistics company: every system, every integration, and every decision about what to build and in what order. Later, as Head of Development at a manufacturer, I built the IT side of an international e-commerce business from scratch, including the order pipeline, the integrations and an AI support assistant.
Alongside that I build and operate my own SaaS products, so I know what a system looks like when it has users, invoices and an on-call rota of one. That is why I care about the unglamorous parts: queues that do not lose messages, migrations that do not break a running release, and logs you can search at 3 a.m.
What I do
Product engineering
Web applications from first commit to production: data model, API, interface, deployment. TypeScript, React and Next.js on the front, Node.js and Python behind it, PostgreSQL and Redis for state.
Integrations and automation
Order pipelines and system-to-system flows built on queues (BullMQ, Redis), webhooks and REST APIs, designed to survive retries, duplicates and partner outages. One production order pipeline completes 99.4% of orders without human intervention.
Backend, data and payments
REST APIs with authentication, rate limiting and webhooks; relational schemas with backward-compatible migrations; billing and invoicing flows that keep money in integer units and make every retry idempotent.
Infrastructure and operations
Docker, self-hosted deployments on Coolify, CI/CD, structured JSON logs and Sentry. I run what I build, so I design for the person who gets the alert.
Selected work
Vertical SaaS that gives a salon, barbershop or solo beauty specialist their own booking website in minutes.
SaaS platform for PDF authenticity verification with a public REST API.
E-commerce platform with 30 locales, product configurators, AI chatbot, and fully automated order flow: Stripe → Zoho CRM → Airtable → Mailgun → PDF.
Databases
Internal sales portal that turns a wholesale deal into its full trade paperwork from one form: pro forma, contract, commercial invoice, packing list, CMR.
Databases
Production algorithmic trading system for perpetual futures – multi-account, event-driven, with a dynamic progressive grid and 10-level risk management.
How I work
I own it end to end
Architecture, code, deployment and what happens at 3 a.m. are the same person’s problem. That keeps decisions honest: nobody ships a design they will not have to operate.
Boring, current technology
I pick well-understood tools and use their current versions. I upgrade deliberately, one major version at a time, with the changelog read and the checks run.
Fail fast, make failure visible
Validate at the boundary, refuse bad input early, do not hide errors behind fallback values. Every service logs structured events with a request ID, and errors that need action reach me.
Idempotent by default
Anything that can be retried, will be. Webhooks, queue jobs and payments carry a deduplication key and can be run twice safely.
Minimal, justified changes
Every change answers a concrete problem. I do not rewrite working code because another approach looks cleaner, and I keep the scope of a task to the task.
Security and money are not afterthoughts
Authorization is checked in the handler that does the work, secrets live in the environment, and money is never a float.
Stack
- Languages
- TypeScript, JavaScript, Python, SQL, PHP
- Front end
- React, Next.js, Tailwind CSS, Framer Motion
- Back end
- Node.js, Python, FastAPI, Hono, REST APIs, webhooks, BullMQ
- Data
- PostgreSQL, Redis, Drizzle ORM
- Infrastructure
- Docker, Coolify, Linux, CI/CD, Cloudflare
- Quality and operations
- Sentry, structured logging, pytest, ESLint, TypeScript strict mode
- Payments and email
- Stripe, Mollie, Resend
- AI
- OpenAI API, Anthropic API, Gemini API, RAG, MCP servers
- Google Cloud
- Cloud Run, Pub/Sub, Eventarc, Cloud Workflows, BigQuery, Firestore, Secret Manager, Vertex AI (Gemini 2.5 Flash)
AvailableHiring a senior full-stack engineer?
Send me the role and what the team is building – I respond within 24 hours.