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Lessons (23)

• AI Evaluation, Safety, and Security

  … oversight where errors can affect people's rights, safety, or access to services. No single prompt or filter …

• Releases, Observability and Production Safety

  Ship changes safely with rollout strategy, flags, migration discipline, rollback plans and observable service-level outcomes. The problem …

• Backend Languages: Node.js, Go, Python & Rust

  … top speed and safety, but you need training to drive it. ![Four backend languages compared](/img/backend/languages …

• Transformers and Large Language Models

  … This can improve usefulness but does not guarantee correctness or safety. - Inference: use the trained model to generate …

• Your Practical Kubernetes Workflow

  … Do not delete or restart things until you understand the event or error. Minimum safety rules - Use a …

• Timeouts, Retries & Backpressure

  … failure. Payment 450 ms Reconcile with idempotency key. Safety margin 150 ms Return before caller gives up. Retry …

• GitOps, Progressive Delivery and Observability

  … real traffic to the new version with no safety net. Argo Rollouts or Flagger add controlled strategies: Strategy …

• Payment Retries: Prevent Duplicate Charges

  … low API latency alone proves nothing about charge safety. Check your understanding What prevents two tabs from creating …

• What to Learn in AI, and in What Order

  … of AI. - Building a useful AI feature includes safety, privacy, reliability, latency, and cost, not just model output …

• Capacity Planning, SLOs and Error Budgets

  … 350 ms Response + safety: 200 ms Pass one deadline down the request path. When the remaining time is …

• Code Smells & Refactoring

  … S ⚠️ Never refactor without tests. Tests are your safety net: they prove behaviour didn't change. The smell …

• Kafka Producers

  … batching, compression, partitioning, the acks setting that trades speed for safety, retries, and the idempotent producer. The big …

• Choosing a Programming Language

  … for network services, Rust when performance and memory safety are hard requirements. - Static types catch errors earlier, but …

• Internals, Upgrades, Resilience and Interview Questions

  … For extra safety, canary with automated analysis. 11. How do you upgrade a cluster? Check deprecated APIs, upgrade …

• Atomic Design & Component Libraries

  … layout narrow viewport, long labels, translated text Regression safety unit tests for behavior; visual checks for appearance Do …

• Frontend Security

  … the safety net A CSP header tells the browser which scripts are allowed to run . Even if an …

• Containers at Scale: ECS Deep Dive and EKS

  … Choose ECS unless you have a concrete reason for Kubernetes. ECS production patterns Deployment safety json { "deploymentConfiguration": { "minimumHealthyPercent …

• Safe AWS Deployments with IaC and CI/CD

  … Restrict the role to the repository, branch/environment, and exact deployment permissions. Deployment safety - Build an immutable artifact …

• Domains, Load Balancers and HTTPS

  … rather than treating health checks as a complete safety gate. Your health endpoint should be fast and truthful …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … New inspectors (health, fire safety) can visit without changing the businesses. Problem: add new operations to a set …

• AWS Interview Questions: Clear Answers

  … state the service, explain why it fits, name one safety concern, then give a small example. Do not …

• Backend Design Scenarios

  … The database unique constraint is the final safety net. A timeout means “unknown,” not “failed.” Use an outbox …

• Practical Lab: S3 File Upload and CloudFront Delivery with NestJS

  … This is the safety net: even if someone later pastes a public policy by mistake, S3 refuses it …