Demos

Nearly every proposal I write leaves behind a runnable demo. Win or lose, it gets sanitized and published. This page is that habit made visible. Everything below runs without credentials (mock modes where needed), and each README states what was measured, what data is synthetic, and what the result does (and does not) prove. The case studies are the deep dives; this is the wider shelf.

Annotated frame: the detector ignores a bright white glare blob near the centre and locks onto the fainter real laser dot up-left, printing the millimetre offset — What "the hard part" looks like: the bright white blob near the centre is glare, and a brightest-pixel detector chases it. The real laser dot is the fainter one up-left, and that's what the detector locks onto (green marker), reading the offset to sub-pixel precision. Generated by running the repo on synthetic frames: a method proof on synthetic ground truth, not field-validated footage.

Industrial Data · MQTT

A Sparkplug B host that doesn't kill live machines

There is no maintained open-source Python host application for Sparkplug B, so I wrote one. It matches death certificates by bdSeq rather than timestamp, treats a sequence gap as reordering before it panics, and rate-limits rebirth because one request makes a node retransmit everything. Fourteen scenarios, no broker, about a second. The README also documents four places the 3.0.0 spec contradicts itself.

Software ↔ Hardware · Safety

Command a machine over MQTT — then try to break it

Every command is classified by what it could do wrong (UI-level / won't move / damages the machine / hurts a person) and must clear that class's hard preconditions. Run break_it.py: eleven checks in about a second, being attempts to make it misbehave plus two that confirm an operator can still recover afterwards. Includes an operator HMI and a real MQTT bridge.

AI Agents · Governance

An agent that can propose a payment — and never make one

Run attack_it.py: fifteen attempts to move money that shouldn't move — prompt injection, self-approval, an amount swapped after approval, a replayed webhook, an "anonymised" phone hash brute-forced in 4,568 tries. All fifteen fail, in about a second, enforced in CI. Three were added after a reviewer broke an earlier version.

Software ↔ Hardware

Short-range depth you can trust: filter, fuse, validate

RealSense D405 short-range depth: a filter + fusion pipeline with a quantitative accuracy-validation harness. Runs on a synthetic benchmark; plugs into real .bag recordings.

Software ↔ Hardware

Reading a laser point to sub-pixel millimetres

A laser dot on a target becomes a live, glare-robust, sub-pixel millimetre offset — method demo for a camera-based leveling readout. NumPy + OpenCV, honest synthetic benchmark.

Systems & Integration

Silent printing for a browser ERP

A local bridge so a browser ERP prints PDFs silently to a chosen Windows printer — zero-dependency Node service with a per-install token and an Origin allowlist. Runs in mock mode on any OS.

Other lanes, other buyers — eleven more demos

Same habit, different buyers: data extraction, payments, marketing ops, route planning. They live down here so the shelf above stays legible. Every one still runs credential-free.

Infrastructure I run

A fleet of MCP servers with no central registry

One MCP = one directory = one port, discovered by scanning rather than by a list someone must remember to update. Spans Windows and WSL, binds loopback by default, turns auth on with an env var instead of a rewrite, and documents the three root causes that actually killed servers in production.

AI & Data

Constrained ASR beats a general model in noise: 52% vs 14%

Closed-vocabulary German number-word ASR: constrained decoding vs a general model, measured under noise — 52% vs 14% at 5 dB. Vosk + Sherpa-ONNX, fully on-device.

AI & Data

Regulatory HTML into strictly validated JSON

Offline-first Python framework parsing government and regulatory HTML into strictly validated JSON. Proven on 233-article statutes with zero warnings.

AI & Data

Floor-plan PDFs into structured data

Architectural floor-plan PDF → structured JSON/Excel (room stamps, areas, fixtures), with a low-confidence validation layer that flags what a human should check. Layout-aware, German-field sample.

AI & Data

Customer segmentation that survives validation

Segmentation → personas with validation beyond statistical separation: bootstrap stability, holdout generalization, an external-outcome check, and a 3-gate k selection (silhouette / stability / distinctness).

Systems & Integration

A four-tier embedded payments architecture, simulated

Multi-tier embedded payments (league → team → player → parent): a technical proposal plus an interactive simulator showing how transactions are tokenized, routed and split across accounts.

Systems & Integration

A private, self-hosted stream between your devices and AI

Self-hosted, DB-less chat stream for moving text and files between PC, phone and AI agents. A single Go binary, token auth, privacy-first — the worked example behind my outbound-boundary note.

Automation

Bounce-rate monitoring with a credential-free mock API

Monitor Klaviyo campaign bounce rates and alert to Slack — an n8n workflow plus a Python monitor, with a mock Klaviyo API so the whole thing demos without credentials.

Automation · Live

Route optimization you can pan and zoom, live

Fleet routing with OR-Tools CP-SAT: −20% mileage on identical stops via district-contiguity constraints. The interactive map is hosted live — open it and follow a single vehicle through its district.

Performance & Backend

1,000 pages: 50 minutes → 2.5

Fast PDF→image rendering (PDFBox) with a custom bounded thread pool — roughly 1,000 pages taken from 50 minutes down to 2.5.

Performance & Backend

A Django slice you can read

Django 6 slice: a pseudonymous community forum plus a bookable-advisor marketplace. Explicitly a code sample to read, not a claim.

These are capability demos, not client deliveries — client work lives in the case studies, anonymized where contracts require. If one of these is close to your problem, it's usually a short step from demo to a scoped first milestone.

← Back home