1M+
data points
on-device
privacy
+22%
retention
Mobile App2023·8 weeks·ongoing
Pulse Health Tracker
Mobile Developer — HealthFirst
A health-tracking app syncing wearable data into clean trends, goals and gentle nudges.
The Challenge
Normalizing noisy, high-frequency sensor data into trends users can actually act on.
The Solution
On-device aggregation, smoothing windows and a goal engine that adapts to each user.
Key Highlights
On-device processing for full privacy compliance
1M+ data points normalized in real-time
+22% user retention after goal engine launch
Adaptive goals based on user behavior
Code Highlights
Smoothing
const trend = ema(samples, 0.2);An exponential moving average turns jittery sensor data into a readable trend.
Tech Stack
React NativeHealthKitTypeScript