About

Hi, I'm Will. Glad you stopped by!

I work with cloud and distributed systems, today as Staff Engineer at Serverless Guru, AWS Community Builder (and AWS Certified). I'm passionate about serverless, AWS and event-driven architectures, and I'm deep into AI agents and how they're changing the way we build software. I also have a confessed soft spot for design patterns and architecture patterns: a good chunk of the problems we face, someone has already solved, tested and named. Finding the right pattern makes life a whole lot easier.

At its core, my job is one thing: take a business problem and turn it into architecture that scales, survives failure and doesn't blow the budget. And honestly? I have a ton of fun doing it.

What you'll find here

Serverless, AWS architecture and AI agents: what I'd pick, why, and what it costs. Most topics come from a technical problem I had to solve or something I had to explain to someone.

Architecture content in practice, the way I like it: with code, real examples and the decisions behind them. The topics revolve around:

Serverless and event-driven on AWS (Lambda, EventBridge, Step Functions, DynamoDB and friends)
Resilience, cost and the trade-offs behind every architecture decision
Design patterns and architecture patterns in the real world (Saga, Circuit Breaker, CQRS and friends)
AI agents, MCP and how AI is changing the way we build software
Best practices and tooling (I'm a fan of Lambda Powertools) and lessons from production

I write the way I wish someone had written for me when I started: straight to the point, with code, no fluff.

Community

Community is half the fun of this career. I'm one of the leaders of AWS User Group São Paulo and a co-organizer of ServerlessDays São Paulo. In October 2026 I was a speaker and mentor at the in-person workshop “Serverless + Agentic AI na AWS” by the Sem Servidor community in Florianópolis: I presented the core services (API Gateway, Lambda, DynamoDB) and LLMs with Amazon Bedrock, and led the hands-on where attendees built AI agents with Strands Agents running on AWS Lambda.

If you're getting started, want to talk career, or want a stage for your first talk, show up at a meetup and come say hi. I mean it, it'll be great to meet you.

Off the keyboard

I'm a dad of two, a boy and a girl who make sure there's never a shortage of events to process at home. And I'm a Brazilian Jiu-Jitsu purple belt: the mats are where I decompress and, by far, the biggest humility lesson I've ever taken.

Where else I write

Besides here, I also publish on the AWS Builder Center and on dev.to. The original always goes up here on willpeixoto.dev.

Let's talk

Find me on LinkedIn, GitHub, X and Instagram. Comment on the posts, send your questions, disagree with me, tell me how your architecture held up in the last outage. You'll get a reply, hold me to it.

BUILD. SCALE. REPEAT. =D