Planning
Twitter / X
Mobile app improvements and new feature rollout for a fast-growing platform.
98.5%
Notification delivery rate
−90%
Failure detection time
−65%
On-call alert volume
0
Regressions post-rollout
01
Problem
Push notification delivery was unreliable across iOS and Android, with up to 30% of critical alerts never reaching the end user. The engineering team lacked observability into the failure modes.
02
Solution
Introduced a unified notification orchestration layer with per-platform retry logic, dead-letter queues for failed deliveries, and a real-time dashboard for on-call monitoring.
03
Timeline
Observability Setup
Jan 2025
Retry Logic & DLQ Build
Jan 2025
iOS / Android Integration
Feb 2025
Stress Testing
Feb 2025
Staged Rollout
Feb 2025
04
Results
- Notification delivery rate improved from 70% to 98.5%
- Mean time to detect failures reduced by 90%
- On-call alert volume dropped 65%
- Rollout completed in 6-week sprint with no regressions
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