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Lessons (16)

• Observability and Incident Response

  … response 1. Start with endpoint success rate and latency split by release, region and dependency. Identify the incident …

• Timeouts, Retries & Backpressure

  … During an incident it takes three seconds; retries occupy every worker and healthy endpoints become slow. What must …

• L6 Production Debugging Casebook

  … must improve before closure? That sequence keeps an incident response evidence-led: reduce harm first, prove the mechanism …

• CloudWatch: Know What Your App Is Doing

  … may not mean users are affected. A practical incident path 1. Alarm says what changed and where. 2 …

• Multi-Account Strategy, Governance and Security Operations

  … Add appropriate creation controls and compliance checks. Incident response outline 1. Detect : GuardDuty, alarms, anomaly in CloudTrail. 2 …

• Putting AI Systems into Production

  … For structured responses, parse against a schema and reject or repair invalid values within a limited policy. Do …

• Containers at Scale: ECS Deep Dive and EKS

  … The platform differs, but safe replacement still requires capacity and a correct shutdown contract. Exercise: Draw the response …

• Design a Logging and Monitoring Platform

  … Define which signals must survive and which may be sampled. Practical response 1. Batch at agents with bounded …

• Debug Latency Like an Investigator

  … Record the trigger, leading signal, mitigation and prevention in the incident note. “Restarted it” is not a root …

• The L6 System-Design Thinking Loop

  … Browsing may show stale availability; a confirmed seat may not. Practical response 1. Estimate arrival rate: 500,000 …

• Resilience, Disaster Recovery and Multi-Region Design

  … The sum must fit the target. Phase Evidence to collect --- --- Detect and declare Incident start and declaration times …

• Domains, Load Balancers and HTTPS

  … the incident. Decide deliberately which dependency checks belong in readiness and how clients receive a degraded response. Exercise …

• Cost Optimization and the Well-Architected Framework

  … data and access protected? Least privilege, encryption, detection, incident response Reliability Does it recover from failure and meet …

• AWS: Start Here

  … For now, identify each component's responsibility. Understand the shared responsibility model AWS manages physical buildings, hardware, and …

• A WhatsApp OTP Is Only Single Use If You Make It So

  … A code must also stop working after its time window and after too many wrong guesses. Practical response …

• Backend Design Scenarios

  … product discovery, public content, analytics and third-party responses. Add jitter so many keys do not expire at …