// 01 · the challenge
Habits break if
the sync does.
D4DX needed a backend for an app people open every single day, check-ins, streaks, goals and notes, where one lost entry breaks more than data. It breaks a habit.
So reliability came first: a mobile-first workload on cloud infrastructure that keeps every reflection safe and every sync instant.
// 02 · what we built
Small app,
serious backend.
An API made for mobile
Lean endpoints for check-ins, goals and streaks, shaped around the app's daily rhythm, not generic CRUD.
Sync that never loses a day
Every entry lands in PostgreSQL the moment it's written, so streaks stay honest across devices.
Cloud sized for growth
AWS EC2 infrastructure provisioned for a mobile-first workload: steady today, ready for the install curve.
Play-Store ready
Hardened for a public launch. The app is live on Google Play with the backend holding.
// 03 · the stack
Boring where it should be.
Proven parts, assembled carefully. Novelty goes into the product, not the plumbing.
api
Node + Express
data
PostgreSQL
cloud
AWS EC2
serves
The mobile app
backend buildcloud infrastructure
// 04 · in production
On the Play Store.
dailythe workload is a habit loop · check-ins and streaks served reliably, every day.
syncedreflections and goals persist the moment they're written · no lost entries, no broken streaks.
livepublished on Google Play, with the backend running quietly in production.