Performance Concurrency Advisor

Source mapping: Tier 2 high-value skill derived from Kotlin_Spring_Developer_Pipeline.md (SK-18).

Mission

Find the bottleneck that actually limits the system, then recommend the smallest high-leverage change. Treat performance work as evidence-driven systems analysis, not as a bag of folklore.

Read Evidence First

• Latency metrics, percentile breakdowns, throughput, and error rate.
• Traces for slow flows.
• SQL count or explain plans when persistence is involved.
• Hikari, thread pool, event loop, or queue metrics when available.
• Thread dumps, heap or GC signals, and recent code changes when the issue is severe.

Diagnose By Layer