Case studies: what I have built and what runs

Port Jatki restaurant CRM and website

Port Jatki is a fish restaurant in Bydgoszcz that I co-own. Before opening, it needed one place for the menu, recipes and costs, invoices, supplier orders, the staff rota and kitchen tickets. Plus a website that Google and tourists can find. I built one dashboard instead of several programs.

What it does and its status

• liveGuest website in 6 languages (PL, EN, DE, UK, ES, ZH), 48 pages with structured data, one-button publishing from the dashboard, changes reported via IndexNow
• livePurchase invoices from KSeF 2.0 every 5 minutes (4:00–20:00), line items and PDF invoices read by Claude, payment batch to import into the bank
• liveRecipes and food cost, recipe price shown automatically on the website menu
• liveProduct and ingredient database loaded from invoices
• liveSales from the Dotykačka POS and a summary for the accountant (PDF and CSV)
• liveTicket screens: POS orders on kitchen and floor screens, live, in serving order
• liveStaff rota for two venues, tablet time clock, push notifications
• in progressInventory: goods received from invoices, stocktaking from a photo of the count sheet, stock issues (the module exists, stock tracking starts when the restaurant opens)
• in progressStock reduced automatically by POS sales (recipe × portions sold)
• in progressOrder suggestions and purchasing plan from sales history (a weekly plan and order list from recipes already exist)
• in progressDocuments by email: contracts and other documents sent to an address and filed in one place
• in progressSocial media in the dashboard: photos, posts in the restaurant's voice, Facebook connection

Numbers

• 6 languages and 48 URLs in the sitemap,
• 12 server functions and 22 end-to-end tests of the dashboard,
• 378 code commits over 23 working days, from 9 October to 6 November 2026.

The restaurant opens at the end of November 2026. The website is live at portjatki.pl.

Video pipeline: video, Shorts and Stories from one script

One script becomes 1 video, 4 Shorts and 12 Stories, with subtitles, descriptions and a thumbnail. A regular channel means many hours of work per episode: recording, editing, subtitles, vertical versions, descriptions and uploads. The pipeline now does most of that work.

How it works

• A fact-checked script: publishing is blocked until the facts are confirmed. I approve the script before recording.
• Voice and subtitles: voice from ElevenLabs, subtitles aligned to the words, with the spelling from the script.
• Editing: Claude plans the scenes, Remotion renders the video with animations synced to the voice.
• Upload: YouTube with a synthetic content label, Instagram, TikTok and LinkedIn, only after I approve.

WealthOS: an investment portfolio app

WealthOS is a web app that brings an investment portfolio held with several brokers, in different currencies, into one place. I built it for myself, because no other app showed my wealth the way I wanted: returns, dividends and allocation were scattered across statements. Since 8 November 2026 it has been in a free test phase: every account has full access and payments are switched off.

What it does

• Broker statement import (CSV and XLSX, including XTB, Saxo and Exante): the whole account history from one file, a chart from the first trade and a comparison with the S&P 500.
• Prices and exchange rates from several sources (if one does not answer, the next one is used) plus ECB rates.
• Modules: portfolio, macro, geopolitics, stock scanner, watchlist, taxes, reports, model portfolios, ETF alternatives and an Academy with courses.
• The Lumi assistant answers questions about using the app and about your own portfolio, with a daily AI cost limit.
• Public pages for Google and AI: about 930 company pages, 29 macro pages, 11 geopolitics pages and 44 glossary entries as ready HTML, with sitemaps and llms.txt.
• Phone app (PWA) with notifications.

Numbers

• 3,578 code changes over 153 working days, from 12 April to 10 November 2026,
• 74 server functions and 359 test files,
• security checked in two reviews (22 and 30 October 2026), including bank details masked before anything is sent to AI.

The test version runs at aktywa.netlify.app (in Polish). The screenshots and video come from a demo account with fictional data. The app shows data; it does not give investment recommendations.