AKAllan Klaus
PTEN

Career

From agency PHP to international product Rails.

The timeline below is what the CV compresses. The details are the ones that matter: zero downtime, a pandemic, a 15-year mailbox, and 200 interviews.

Aug 2022 — present

Topia

Software Engineer

Remote · Global mobility

  • Led the Rails 5.0 → 7.0 and Ruby 2.3 → 2.7 upgrades, improving security and maintainability.
  • Cut report generation time by 70% for company-wide operations.
  • Added Datadog tracing and kept internal admin systems running for the whole company.
Ruby on RailsGolangReactElectronPostgreSQLMySQLDatadog

Aug 2022 — present

Nexton

Technical Screener

Remote · Technical hiring

  • Interviewed 200+ engineers across seniorities for Go, Ruby, React, Node.js and AI roles.
  • Helped international teams hire with technical rigor and product context.
GoRubyReactNode.jsAI

Jan 2022 — Jul 2022

Foxbox Digital

Software Engineer

Remote · Digital product

  • Shipped product work for an international client on a distributed Brazil–US team.
Ruby on RailsJavaScript

Jan 2021 — Jan 2022

Estratégia Educacional

Software Developer

Edtech · E-commerce

  • Maintained and improved the sales platform of Brazil’s largest exam-prep edtech.
  • Shipped recurring payments integrated with external providers.
GolangVuePostgreSQLTerraformGitHub Actions

Aug 2019 — Jan 2021

Jaya Tech

Software Developer

Healthtech · PWNHealth / Everly Health

  • Built and maintained the telehealth system between physicians and patients.
  • Shipped the COVID-19 flow at the start of the pandemic: triage, tests and visits.
  • Created auto-scheduling — until then every visit was booked by hand.
  • Improved DoseSpot integration, PHI encryption, and migrated e-prescription with zero downtime.
Ruby on RailsJavaScriptMySQLRedisDockerSidekiqCircleCI

Mar 2016 — Aug 2019

Locaweb

Junior → Senior Software Engineer

São Paulo · Email product

  • Refactored a 15-year-old database with zero downtime. A new mailbox size went from 3–4 weeks to two records.
  • Improved provisioning for Locaweb Mail, G Suite and Outlook.
  • Mentored junior and mid-level engineers and wrote for the company blog.
Ruby on RailsPHPElixirJavaScriptGolangMySQLPostgreSQLRedisDockerGitLab CI

Jul 2013 — Jul 2015

AM Consulting

Software Developer

São Paulo · Startup

  • Improved a digital-products platform with a five-level referral system.
  • Shipped an internal currency and a buy/resell flow with shared commissions.
PHPJavaScriptMySQL

Jul 2011 — Jul 2013

Connectsantos

Software Developer

Santos · Digital agency

  • Built an enterprise social network from scratch, connecting customers and companies.
  • Shipped and maintained more than five e-commerce stores.
PHPJavaScriptMySQL