From the dev team
Engineering
Friendly technical notes from the Rejourney team on mobile replay, SDK architecture, map capture, infrastructure, and performance.
May 18, 2026 · 4 min read
Ambiguity Kills App Growth
Why API errors can hurt mobile user retention more than crashes.
May 06, 2026 · 8 min read
How We Keep Mobile Session Replay 17× Cheaper Than PostHog
The specific engineering decisions and great GDPR providers.
May 05, 2026 · 12 min read
Rejourney Swift Package Is Now in Open Beta
The session state machine, two start paths, URLProtocol swizzle, visual capture backpressure, ANR ping-pong, and crash recovery checkpoints — how the native iOS SDK actually works.
Apr 23, 2026 · 9 min read
Rejourney Hits 1.3 Million Session Replays in 3 Months
Lessons in edge security, durable pipelines, and scaling during a 10x traffic spike.
Feb 17, 2026 · 4 min read
120Hz Map Performance: Hooking Native SDKs
Solving micro-stutter on Apple Maps, Google Maps, and Mapbox via delegate swizzling.
Feb 06, 2026 · 8 min read
Rejourney Architecture
How we achieved pixel-perfect replay with 3 FPS and zero main-thread impact.