Career Site Returning an Error (February 9th) - US SLs

Update timeline

1. monitoring Feb 09, 2026, 04:03 PM UTC

   The errors have subsided, and no further issues have been observed. We will remain vigilant and continue monitoring.

2. resolved Feb 09, 2026, 05:01 PM UTC

   This incident has been resolved.

3. postmortem Feb 21, 2026, 12:23 AM UTC

   **Incident Summary:** On February 9th, 2026, clients hosted in the US Production environments \(SL1, SL2, SL3, and SL5\) experienced a temporary service disruption affecting the Career Site. **Impact:** During the incident window, users experienced intermittent slowness and brief periods of unavailability while accessing the Career Site. The impact was limited to elevated traffic conditions during off-peak hours. **Root Cause Analysis \(RCA\):** The disruption was caused by an unexpected surge in traffic to the Career Site during off-hours. The elevated request volume temporarily exceeded the available application capacity, which resulted in service instability. **Resolution:** Upon identification of the issue, Cornerstone engineers promptly increased application capacity to stabilize performance and restore normal service levels. Platform performance was continuously monitored to ensure full recovery and sustained stability. **Preventive Measures:** To reduce the likelihood of recurrence, Cornerstone is implementing the following improvements: Adjusting auto-scaling schedules to better accommodate traffic patterns during off-hours Enhancing monitoring thresholds to proactively respond to sudden traffic spikes Reviewing capacity planning assumptions to ensure sufficient headroom during peak and off-peak periods