I build the systems a company runs on.
I'm Sjaack Tieman. I ran production floors for about nine years. Now I build AI automation, workflows and business software. The latest: nine separate apps merged into one ERP in five months, for a food distributor in Lima.
Until June 2026: nine apps, nine logins.Now one.
- Chatbot dashboard
- Applicant screening
- Agenda and tasks
- Meeting minutes
- Attendance
- Delivery app
- Stock
- Product catalog
- Sign-in dashboard
Rebuilt for this page with sample data. The real screens hold a client's numbers.
NEXO is in production. People clock in on it at twenty past six.
| Separate apps merged into one | 9 | measured, project plan |
|---|---|---|
| Pages | 320 | measured, Nov 2026 |
| API routes | 594 | measured, Nov 2026 |
| Database migrations | 226 | measured, Nov 2026 |
| Commits in the repository | 1,338 | measured, Nov 2026 |
| Lines of TypeScript | about 310,000 | measured, Nov 2026 |
| Customers in the CRM after import | 1,563 | measured, June 2026 |
| Staff on the attendance clock | 75 | measured, Sept 2026 |
Sales, stock, finance, HR, production and deliveries, in one place with one login. Rights are set per role and per screen, by the company's own admin.
I did not replace everything in one weekend. The old apps moved in one at a time while the work went on.
Other work
- AI customer serviceOne assistant, built for WhatsApp, Messenger and Instagram, that knows whether it is talking to a consumer or a business and answers from the company's own documents.n8n, RAG
- Delivery systemThe day's orders go in as a spreadsheet. Out come routes per zone, a phone app for drivers that works without signal, and a settlement per zone at the end of the day.Logistics, PWA
- n8n workflow examplesFour workflows you can read, import and run. Built for a made-up coffee roaster, tested, and published with the tests.Open source
- JACKMy own voice assistant. It listens on my laptop, thinks with Claude, talks back, and can read my calendar, my messages and my servers.Own project
What I can do for you
- Look first
- A paid audit of one process: what happens now, where the time goes, what I would automate and what I would leave alone. You get it in writing.
- Build it
- A workflow, a chatbot or a business app, for a fixed price that we agree on before I start.
- Keep it running
- Monitoring, updates and small changes for a monthly fee. Software that nobody looks after stops working on a Friday afternoon.
What I will not do
- Automate a process that nobody can explain to me.
- Let a model decide about money or stock without a rule in code next to it.
- Build a chatbot that pretends to be a person.
I was the user before I was the builder.
For about nine years I was a production manager: planning, stock, quality, delivery, and a hundred people who needed the numbers to be right at the start of the shift. I have filled in the spreadsheet that everybody hated. I know why it existed.
That is the difference when I build something. I do not start with the tool. I start with who has to use it at six in the morning.
Tell me what goes wrong on a normal Tuesday.
Thirty minutes, video or phone. You describe one process that costs you time. I ask questions and tell you honestly whether I would automate it, fix it first, or leave it alone. No slides.
Lima time, UTC-5. I reply within one working day, in English, Dutch or Spanish.
Open to remote roles and to projects.