Halo
Full‑stack real‑time chat across native mobile and web on one Express + Socket.IO backend — voice, image & video messages, reactions, presence, read receipts, and push notifications.
The problem
Teams often end up with a mobile chat experience and a web chat experience built on two different backends that drift out of sync — different message formats, different presence logic, duplicated bugs.
What we built
We built one Express + Socket.IO backend that serves both a React Native app and a React web client from a shared message and presence layer — with voice notes, image and video messages, emoji reactions, typing indicators, read receipts, and push notifications wired in from day one.
Result
A single real-time chat product that ships mobile and web together, with one codebase to maintain for message delivery, presence, and notifications instead of two.
Screens
