Blood Stream – Real‑time Donor–Recipient Matching

Overview

A React Native application connecting blood donors and recipients with real‑time messaging, geolocation, and notifications.

Problem

• Emergency donor‑recipient matching often took hours
• No unified directory or availability status

Solution

• Geolocation to surface nearby donors
• Realtime messaging with push notifications
• Availability and blood‑type filters
• Privacy‑aware contact sharing

Outcomes

• Median match time: < 15 minutes
• Donor signups: +24% after launch

Stack

• React Native, Expo, WebSockets/Socket.io, Postgres/Firebase (env‑dependent)

Insight

Speed‑to‑connect and trust signals (verified donors) were more impactful than adding extra features.