Hallett Dev Labs · Public showcase

Application case study

Thermostat

Home climate monitoring, history, and configurable notifications.

Python · React · PostgreSQL

From the application repository

Published project notes

Checking for accepted release documentation…

Project context

Why this project exists

An application designed around reproducible releases, environment isolation, and application-owned documentation.

Ownership

An original Hallett Dev Labs application, with application behavior and documentation maintained in its own repository and deployment integration maintained with the platform.

What it does

Climate monitoring

View home climate information in an application dedicated to understanding temperature conditions.

History

Review recorded measurements over time to understand changes and patterns.

Configurable notifications

Configure notifications around the conditions the application monitors.

How it fits together

User interface

A React frontend presents monitoring information and application controls.

Application service

A Python service implements application behavior and its API.

Persistent history

PostgreSQL stores application data, with environment isolation managed by the hosting platform.

Release documentation

An immutable documentation image accompanies the application release. The Atlas v2 contract allows accepted documentation updates without an Atlas rebuild.

Engineering decisions

Reproducible releases

Immutable image references make deployment identity explicit and keep promotion tied to the artifacts that were validated.

Environment isolation

Stage provides a validation point before production. Development and validation procedures belong alongside the application source.

Documentation as a release artifact

Versioned guides provide a reference for the deployed application, including its operational and testing expectations.

Operational approach

The deployment process validates releases through Stage before production promotion. The private reference holds environment-specific instructions; this public case study describes the approach without including household measurements, notification destinations, or access details.