MyMemory

A cross-platform delayed-letter app that combines time-locked messages with photo galleries, collaborative albums, and private memory storage.

Built and operated inside an employer against real business requirements and real users.

Project Overview

MyMemory is a cross-platform mobile and web app built with Expo that turns the waiting experience of physical mail into a digital product constraint. Senders can create letters that remain locked until a selected date, while SMS sign-up, photo galleries, collaborative albums, private albums, and photo-sharing flows are backed by ExpressJS, MongoDB, GCP Cloud Run, and Cloud Storage.

Product screens

Mobile home separating photos, albums, and private storage

Media view for inspecting and sharing an individual photo

Delayed-letter inbox that separates sent and received letters

Collaborative album screen for inviting members and managing album settings

Personal gallery for browsing photos by date and adding new memories

Key Challenges

Turning delayed access into a meaningful product feature
Supporting iOS, Android, and Web from a shared Expo codebase
Guarding locked letters on the server side instead of relying on client checks
Handling photo upload and download flows through cloud storage
Keeping private storage, shared albums, and letter delivery clear in one mobile experience

Key Outcomes

Operated a cross-platform letter and photo sharing app for about 1.5 years
Built time-locked letter delivery with server-side access control
Supported photo galleries, collaborative albums, and private photo storage
Used Cloud Run and Cloud Storage for low-maintenance operations

Technologies

ExpoReact NativeExpressJSMongoDBSMS AuthenticationGCP Cloud RunCloud StorageGitHub