Work

The backbone of heat and water cost allocation: site/block/unit records, meter inventory, readings, the billing engine, accounts, field service and HR. PHP, one code base, period-scoped databases.

• Watching how the system is actually usedJune 24, 2026
• Moving two thousand invoices into the backgroundJune 11, 2026
• Moving a ten-year-old system without forking itJune 2, 2026
• “A DN20 clamp-on ultrasonic water meter” — searching a catalogue in a sentenceMay 21, 2026
• How a heating bill is actually calculatedMay 9, 2026

The resident portal. You see your bill, your daily consumption against the weather, and how it compares with the building average. A separate panel for site managers. PHP 8.3 + FastRoute + Twig, written from scratch.

• I rewrote the portal that shows the billApril 22, 2026

The licence and log server for field reading terminals. No framework — a PHP 8.3 micro-framework with a console-themed admin.

• I wrote an admin panel without a frameworkJune 18, 2026

The reading application in the field technician’s hands (.NET). Reads meters over an optical head and wM-Bus radio, decodes the telegram, fetches its licence from the server. v4 “Aurora” ships over ClickOnce.

• Three ways to read a heat meterFebruary 18, 2026

A conversational layer over a commercial ERP. A manager asks in plain language, the system builds the right query, and every number comes from the database carrying its source.

• The spreadsheet was right, the system was wrongAugust 31, 2026
• I caught a hallucination live, and it became a product ruleAugust 25, 2026

A flight-decision app for drone pilots. Web + Android + iOS. Wind by altitude, geomagnetic activity, no-fly and GPS-jammer maps, camera/ND recommendations and a flight-log decoder.

• I have no Mac, and an iOS appAugust 28, 2026
• Decoding a flight log: same extension, two different worldsAugust 17, 2026
• “Can I fly?” is a decision, not a scoreJuly 28, 2026

A recipe system that tells you what you can cook with what you have. Scaling, a technique library, membership, and a channel that publishes itself to social media.

• What can you cook with what you have — and a site that publishes itselfSeptember 13, 2026

A deterministic match simulator. You build a squad, the engine plays the match; the same seed produces a bit-for-bit identical match anywhere.

• I wrote my own captcha — five layers, four of them invisibleSeptember 3, 2026
• The root of determinism: the language’s own randomnessSeptember 2, 2026

A crypto trading engine that decides on its own. It classifies the market regime, gates four strategies by regime, and refuses any trade that fails an expectancy test. Node engine + PHP dashboard.

• I wrote a trading engine that decides on its ownSeptember 4, 2026

A diagnostic engine that scans an address and produces evidenced findings and a transparent score: SEO, AI visibility, security, DNS/email, technology + CVEs, privacy compliance.

• If it cannot be measured, it says “not verified”September 14, 2026

An always-on voice assistant at home. It listens, separates speakers, recognises faces, drives home devices and writes code. Its brain is a Claude Code session.

• Who spoke, where from, what now — three separate questionsSeptember 7, 2026
• Settings that are silently ignored, and 8.9 seconds becoming 1.8September 6, 2026

An engine that analyses a track and turns it into a light show. DMX and Philips Hue output, a show engine that is a pure function of time, and a room-acoustics measurement tool.

• My instrument mistook silence for reverbAugust 24, 2026
• render(t): no accumulated state, so it can rewindAugust 22, 2026
• Nobody answers anybody on a DMX cableAugust 21, 2026

A personal server and VPN. Personal projects moved off client hosting; PC, phone and a Quest headset come in over the tunnel.

• I built my own server and put the house behind a tunnelSeptember 5, 2026

Operating the server that hosts dozens of client sites: mail, firewall, bot traffic, PHP-FPM pools, and a root-cause log.

• The watchman said “all clear”, because it was counting the wrong stageSeptember 8, 2026

The corporate site of a mechanical contractor and authorised Siemens partner. 90 pages, TR/EN/DE, generated from one source.

• Ninety pages, three languages, one sourceAugust 13, 2026

E-commerce for Siemens products: catalogue, a compatibility engine, cart and checkout, a Google Merchant feed and a help desk.

• “Will this fit instead of that one?” — a compatibility engineSeptember 12, 2026
• “The site won’t open” and “the payment isn’t showing”: two root causesSeptember 10, 2026

The site of a heat-meter inspection laboratory. Accredited scope, documents, and a request wizard that finds the right inspection type without asking you to know the regulation.

• Let them fill in the decision, not the formJuly 8, 2026

A draft site and technical audit for a luxury and supercar service in Maslak, Istanbul.

• Press the button before you write the proposalAugust 5, 2026

A draft site for a home-textile manufacturer in Bursa. The product tree was extracted from a 77-page catalogue PDF.

• From a 77-page PDF to 68 productsJuly 23, 2026

A dealership operations platform: vehicle stock, processes, sales, service, used-car listings and a public showroom site. Layered architecture, multi-tenant.

• Twenty-nine commits in a day: building a dealership platform from the bottomJuly 3, 2026

A game platform I built for my son. Backgammon, okey, card games, hangman and a robot-combat RPG — all multiplayer.

• I built a game platform for my sonMarch 14, 2026

My own site. Two modes: the professional narrative and “Inside My Mind” — a thought simulator, a groovebox that runs in the browser, and this log.

• Sixteen cells vanished: the generic class name trapAugust 9, 2026
• I taught my site to thinkJuly 2, 2026

Two tools that tidy my own desk: a disk analyser that reads the NTFS master file table directly, and a mail tool that strips closed conversations out of an inbox.

• Don’t walk the disk, read its ledger — and two tools that tidy my deskSeptember 9, 2026