Aaron Carpenter

Flutter · Android, Windows, web

LogiMaps

Navigation and hazard awareness for delivery drivers and first responders, on an all-free OpenStreetMap stack. Scans package labels into a stop list, routes around tolls and driver-marked impassable roads, speaks turns offline, and layers responder data over the map: FEMA’s national shelter registry with live status, IPAWS and state alerts, roughly 495 county and town alert feeds across 16 jurisdictions, 38 road-closure sources, flood gauges, road-weather sensors, air-quality and smoke overlays, and nuclear-plant zones. The largest of these codebases, at 53 Dart source files and 64 tests, prepared for open release.

What the constraint forced: every network call is wrapped so that a failure writes one line to a diagnostics screen and nothing else — the driver is never interrupted. The optional Claude advisory layer lives on a PC behind a token-gated, rate-capped relay, so the phone never holds a credential and the app is complete without it.

Flutter · Android, Windows

Weather Generative Button

Built at the request of the American Red Cross Northeast sector IT lead, for volunteers and first responders. Aggregates current weather, water and alert data for a given coordinate and radius, and emits a structured plain-text safety report. Working end to end.

What the constraint forced: every source had to be replaced with a free, key-less equivalent, and each one wrapped in its own failure boundary. A source that goes down costs only its own lines, and says so in a status block rather than failing the report silently. The data sources, the report layout, and a survey of every New York county’s alert system are documented in the repository.

Kotlin · Jetpack Compose · Android

ChirpSqueak

Transmits and receives short text messages as audible sound, phone to phone, over an 8-FSK phase-continuous protocol. No pairing, no network, no account — two devices in the same room and a speaker. Messages can be sealed with a QR-paired AES-256-GCM key. A prototype: the modem and cipher are verified by 70 unit tests against synthesized audio, not yet field-tested between two phones.

What the constraint forced: a dependency audit rather than a feature list. QR decoding went to ZXing instead of the obvious ML Kit, whose detector self-downloads its model on first use — which would have required exactly the permission the application is built to refuse.

Flutter · Android, web

Oswego Crier

A public-service application for residents of Oswego, New York, consolidating emergency alerts, local news, city hall announcements and emergency resource contacts into one place. Seventy-two Dart source files and 315 tests across models, services, screens and widgets, with a signed release bundle built for Google Play. The web edition is live on this site.

What the constraint forced: the architecture had to survive with no budget behind it — no paid feeds, no per-seat services, nothing that turns into an invoice a small city has to justify. A civic tool that depends on someone remembering to renew it is not a civic tool.

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Kotlin · Jetpack Compose · Android

WhatWeKept

A location-based game on live satellite maps — GPS player marker, proximity-gated interaction, NWS forecast, radar and cloud-cover overlays, and per-user progress. The backend contract was written first: deny-by-default Firestore security rules, deployed, with the client built behind a repository interface so that backend drops in; the current build persists locally.

What the constraint forced: the rules had to be written as though the client were hostile, because a mobile client always is. Access decisions are expressed in server-side security rules (validated create-only; update and delete refused), not in the code path that calls them — so the client is not trusted to do the right thing, only prevented from doing the wrong one.

TypeScript · Node · MariaDB · daily crawl

Remote Job Search

A free, public search of remote jobs for anyone looking for work. Once a day it reads the public job boards of more than 18,000 employers directly — on Greenhouse, Lever, Ashby, SmartRecruiters, Recruitee, Rippling, Breezy, BambooHR, Workday, Oracle, iCIMS, Phenom, SuccessFactors, Eightfold and Radancy — another 4,500 on Workable a slice at a time, within the limits Workable sets, plus three remote job boards, keeps only remote roles, and labels each one for the filters a reader needs: role, region, US state, pay, and whether a posting asks for a bachelor’s degree, travel, in-person days, another language or a professional license. On 9 October 2026 that was 62,599 remote jobs from 7,513 employers. It is now growing into a full-stack product: the search runs on a shared, typed TypeScript core, and a Fastify API with a MariaDB database is being built for optional free accounts that keep searches on every device and send job alerts, with passkey sign-in and every change tested against a real database.

What the constraint forced: the crawler may remove only what is not a remote job — on-site roles, commission-paid roles, test postings — and must label everything else, because hiding a real job from someone who needs one is the costly mistake. So labels carry their evidence: a job tagged “bachelor’s degree required” quotes the sentence that set it, and 65 regression tests pin each misreading found along the way.

Search remote jobs