Mateus Welter

DevOps Engineer · Brazil

kubernetesterraformci/cdobservabilityaws·gcp·oci

What I do

Cloud & IaC

Scalable, cost-efficient infrastructure on AWS, GCP & OCI — provisioned with Terraform, never by hand.

CI/CD & Automation

Pipelines with GitHub Actions & ArgoCD that ship code to production without drama.

Observability

Systems that tell you what's happening — OpenTelemetry, Prometheus, Grafana, Datadog.

📍 Cerro Largo, Brazil — working with teams everywhere.

Experience

  1. Support EngineerE-core

    2024Current

    Production troubleshooting for teams running Apollo Router and Apollo Federation: incident investigation, observability analysis, and fixes merged upstream into the routing layer.

    apollo routerfederationgraphosopentelemetryrusttroubleshooting
  2. DevOps EngineerEzops.cloud

    20232024

    Implement scalable systems on AWS, ECS, and EKS.

    awsecseksdockergitci/cdcloudformationterraformgkeaws lambdaonpremvmwareazuredevops
  3. DevOps Engineer Jr.TMaior Services

    20222023

    Develop and deploy systems rapidly and securely.

    awsecsgkedockergitci/cdcloudformationterraform
  4. Backend DeveloperLojas Becker

    20202022

    Develop REST APIs using PHP, Advpl, and Node.js.

    advplphpjavascriptdockercloudrestshell

Skills

Core
Kubernetes (EKS · GKE · OKE)TerraformDockerCI/CD (GitHub Actions · ArgoCD)Linux
Observability
OpenTelemetryPrometheusGrafanaLokiTempoDatadog
Cloud
AWSGCPOCI
Also
GraphQL Federation (Apollo)REST APIsRustGoPythonTypeScriptBash

Contributions

Merged pull requests to the open-source infrastructure I run in production — Apollo Router and Apollo Federation, written in Rust, plus the NestJS GraphQL integration.

apollographql/router#9306

docs(observability): document apollo.router.cache.redis.reconnection and .unresponsive metrics

merged · May 2026

nestjs/graphql#3953

test(@nestjs/apollo): add e2e coverage for subscriptions with ApolloFederationDriver

merged · Apr 2026

apollographql/router#8974

fix(composition): relax @interfaceObject validation for Fed 1 subgraphs

merged · Apr 2026

apollographql/router#9141

fix(connectors): handle 204 responses without Content-Length header

merged · Apr 2026

apollographql/router#9028

fix(helm): fix PDB template ignoring zero values for minAvailable and maxUnavailable

merged · Apr 2026

apollographql/federation#3391

fix(composition): resolve @composeDirective definitions per-directive instead of per-spec

merged · Mar 2026

apollographql/router#8929

fix(helm): use router.fullname for ServiceMonitor metadata.name

merged · Feb 2026

apollographql/router#8587

docs: update Redis metric from connections to clients

merged · Dec 2025

more on github →

Certifications

Apollo Graph Developer - Professional badge

Apollo Graph Developer - Professional

Apollo GraphQL

2025 · no expiration

AWS Certified Cloud Practitioner badge

AWS Certified Cloud Practitioner

Amazon Web Services (AWS)

2024 → 2027

Apollo GraphQL - Associate badge

Apollo GraphQL - Associate

Apollo GraphQL

2024 · no expiration

Projects

echoweather

A weather supergraph built to show how federation actually composes: NestJS subgraphs behind the Apollo Router, with entity resolution across services. Runs locally as a reference implementation.

nestjsgraphqlfederationapollo router

homelab k8s cluster

private

Bare-metal Kubernetes without the manual rebuild. Terraform provisions the Proxmox VMs and Ansible drives kubeadm, so the whole cluster comes back from an empty hypervisor in one command.

terraformproxmoxansiblekubeadm

aws pipeline monitor

private

AWS pipeline failures surface in the console and nowhere else. A Lambda subscribed to pipeline state-change events pushes them into Discord instead, so a broken deploy is seen when it breaks.

awslambdadiscord

this portfolio's infra

private

This site, on infrastructure I run end to end: Next.js on Vercel, a Go service on Oracle Kubernetes Engine, CI with GitHub Actions and CD with ArgoCD. Every change ships through the pipeline, nothing by hand.

okegolanggithub actionsargocd
more on github →

Work with me

I help small engineering teams run production infrastructure — AWS, Kubernetes, CI/CD and observability — without hiring a full-time DevOps engineer.

Infrastructure assessment

$500 · fixed price · two weeks

I review your cloud setup, pipelines and monitoring, then deliver a written assessment: what is there now, what is most likely to break, and what to fix in what order. You keep the document whether or not we work together.

Read-only access is enough. No changes to your systems.

Get in touch