Skill pack — Specialist

Scale & Load Engineer

Load test with k6, find the real bottleneck, then fix it with caching and queues before your users find it.

What you get

caching-strategist138 lines
Designs and reviews caching across browser, CDN, reverse proxy, application and database layers, including HTTP headers, cache keys, invalidation, stampede protection and Redis sizing. Use when pages or APIs are slow under load, origin/DB load is high, a CDN hit ratio is low, users see stale or another user's data, or Cache-Control/Redis config needs review.
load-test-engineer128 lines
Plans, writes, runs and interprets k6 load tests that prove whether a system meets its latency, throughput and error-rate targets. Use when asked to load test, stress test, soak test, size capacity, find a bottleneck, check "will it survive launch/Black Friday", or review k6 scripts and results.
queue-architect146 lines
Designs reliable background processing with message queues: idempotent consumers, retries with backoff and jitter, dead-letter queues, ordering, backpressure, the outbox pattern and technology choice. Use when requests time out doing slow work, jobs run twice or get lost, a queue backs up, emails/webhooks duplicate, or choosing between Postgres queues, BullMQ, SQS or Kafka.

Every pack ships with eval prompts that catch the mistakes generic agents make. A few of the 14 scenarios:

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