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Ambient agents respond to events such as an Amazon S3 upload, a schedule, or an alert instead of waiting for a chat prompt. This post walks through building framework-agnostic ambient agents on Amazon Bedrock AgentCore using Amazon SQS, AWS Lambda, and Amazon DynamoDB, with a single ask_human tool and a Jobs page for human-in-the-loop review.
24 min · 5,504 words
Mixture of Experts (MoE) for Backend Engineers
A detailed visual guide to token routing, expert batching, weighted combination, and the memory and communication tradeoffs of MoE serving. Suppose a model has dozens of feed-forward subnetworks, but each token uses only two of them. The arithmetic per token can stay modest while the total weight set grows. Now place that model on eight GPUs. If every GPU stores all experts, memory can become the limit; if experts are split across GPUs, token activations must travel to whichever GPU owns their…
15 min · 3,515 words
Retry vs Circuit Breaker vs Fallback
Retries, circuit breakers, and fallbacks solve different failure modes in backend integrations. Using the wrong one can amplify outages—here is when each pattern helps and when it hurts.
6 min · 1,469 words
Swap, ZRAM, Zswap and Hibernate on NixOS
Matthew Brunelle untangles swap vs ZRAM vs zswap for suspend-then-hibernate on NixOS: why hibernate needs real swap, how swap files complicate resume, and the config that finally worked after several wrong turns.
3 min · 780 words
Sam Rose's interactive ngrok blog post really shows how Kubernetes liveness, readiness, and startup probes work—using webernetes browser demos to explain restart loops, rollout drops, and how probes make apps more resilient.
15 min · 3,465 words
Benoît Devilliers hardens a Hermes assistant for client data: Tailscale-only VPS, least-privilege bot accounts, spending caps, per-user agents, and Infisical Agent Vault so credentials never sit in the model context.
5 min · 1,118 words