DavidGavriilidis

A typed .NET client for AADE's myDATA, the e-invoicing API every Greek business has to report through. It reproduces AADE's arithmetic and business rules in a validator that runs before anything is serialised, and returns results per invoice, because a batch can come back as HTTP 200 with some invoices rejected.

Rejection codes caught locally

11

Test tiers

4

Closing 60+ tabs becomes one undoable command. A popup, a full-page GUI and an in-browser terminal all call the same UI-free TypeScript core. Chrome's own bookmarks are the only data store, so sync between devices comes free, with no server and no account.

Vitest tests

73

Bugs caught before release

2

Trash before purge

48 h

A Chromium extension that checks the accessibility of a page while you use it, instead of after a crawl. A heuristic engine settles everything a rule can decide, and a Gemma 4 model running locally takes the cases that need judgement, so the page is analysed on your own machine and never sent to a server.

Platform

Manifest V3

Model

Gemma 4, on-device

Checks

heuristics → LLM

Three models side by side: a TF-IDF logistic regression baseline, a bidirectional LSTM and BERT. All three passed 98% on the test set, which looked too good for a static dataset, so I ran the models on articles from outside it and used SHAP to see which words drove each verdict. They had learned shortcuts, like the word “Reuters”, which regex cleaning now strips before training and inference.

Accuracy LR / LSTM / BERT

98.42 / 99.91 / 99.74 %

Prediction time

~1.5 s → 8–10 ms