Will Peixoto is a Staff Engineer at Serverless Guru and writes about serverless, AWS architecture and AI agents: what he'd pick, why, and what it costs.https://willpeixoto.dev/enenhttps://willpeixoto.dev/eventbridge-new-custom-event-bushttps://willpeixoto.dev/eventbridge-new-custom-event-busNew EventBridge Custom Event Bus: RAM sharing, replay and FIFO by EventGroupId. When it takes SQS FIFO out of your integration, and when it doesn't.Thu, 29 Oct 2026 12:00:00 GMTAWSeventbridgeserverlessevent-driven-architecturearchitecturehttps://willpeixoto.dev/invisible-coupling-distributed-monolithhttps://willpeixoto.dev/invisible-coupling-distributed-monolithSynchronous call chains turn microservices into a distributed monolith. How temporal coupling costs you p99 latency, money and resilience.Tue, 27 Oct 2026 12:00:00 GMTMicroservicessoftware architectureevent-driven-architectureserverlessAWShttps://willpeixoto.dev/lambda-web-functions-when-to-usehttps://willpeixoto.dev/lambda-web-functions-when-to-useLambda Web Functions runs your Node.js server with per-environment concurrency and active CPU billing. When to switch, and the gap in South America.Thu, 22 Oct 2026 12:00:00 GMTAWSaws lambdaserverlessNode.jsarchitecturehttps://willpeixoto.dev/lambda-microvms-shell-lifecycle-hooks-best-practiceshttps://willpeixoto.dev/lambda-microvms-shell-lifecycle-hooks-best-practicesLambda MicroVMs now takes a shell. How to connect, implement lifecycle hooks in Node, and apply the performance, security and cost best practices.Tue, 20 Oct 2026 12:00:00 GMTAWSaws lambdaserverlessSecurityfirecrackerhttps://willpeixoto.dev/data-streaming-on-aws-kinesis-firehose-flink-mskhttps://willpeixoto.dev/data-streaming-on-aws-kinesis-firehose-flink-mskWhat each one is and when to use it: Kinesis Data Streams, Amazon Data Firehose, Managed Service for Apache Flink, and Amazon MSK.Sat, 18 Jul 2026 04:34:07 GMTAWSstreamingdata streamingKinesiskafkaflinkarchitectureserverlesshttps://willpeixoto.dev/multi-cloud-less-resilient-availability-mathhttps://willpeixoto.dev/multi-cloud-less-resilient-availability-mathMulti-cloud promises more resilience and delivers the opposite: more failure surface. Let's open up the availability math, see why the "if one goes down the other holds" intuition fools you, and go through the few cases where multi-cloud actually earns its keep.Thu, 16 Jul 2026 23:38:22 GMTAWSarchitectureResiliencemulti-cloudserverlesshttps://willpeixoto.dev/aws-lambda-microvms-untrusted-code-isolationhttps://willpeixoto.dev/aws-lambda-microvms-untrusted-code-isolationAWS just shipped Lambda MicroVMs, a new serverless primitive that gives each user or session a VM-level isolated sandbox, with near-instant launch and state preserved for up to 8 hours, all on Firecracker. Here is what it is, when to reach for it instead of a plain Lambda Function, and how to architect on top of it.Wed, 24 Jun 2026 03:50:52 GMTAWSaws lambdaserverlessfirecrackermicrovmAIhttps://willpeixoto.dev/high-availability-has-a-price-resilience-is-a-decision-not-a-stackhttps://willpeixoto.dev/high-availability-has-a-price-resilience-is-a-decision-not-a-stackThe cost of high availability: resilience starts with strategic decisions, not technology.Sat, 20 Jun 2026 19:01:18 GMTAWSCloud ComputingarchitectureReliabilityDisaster recoveryhttps://willpeixoto.dev/aws-mcp-server-which-to-use-and-configurehttps://willpeixoto.dev/aws-mcp-server-which-to-use-and-configureKnowledge MCP vs the managed AWS MCP Server, IAM, and the setup in Claude Code, the Claude app, and Kiro without pasting a key into .envSat, 20 Jun 2026 18:37:40 GMTAWSagentic AISecurityserverlessArtificial IntelligenceCloud Computing