tthiago.marques
Years shipping
5+
Led Rails upgrade
3.2 → 7.2
B2B volume
Millions/mo

Thiago
Marques.

Software engineer.

I design and scale backend systems that stay reliable under real load — Ruby on Rails, TypeScript, AWS.

Section / 02

About

Software engineer with 5+ years building and modernizing systems that run at scale. I led the modernization of a B2B marketplace at Itaú processing millions of transactions a month — including a full Rails 3.2 → 7.2 migration shipped without downtime — and shaped the platform and APIs behind Brazil's largest real-estate marketplace. I work end-to-end: from building resilient backends and pragmatic interfaces to architecting the CI/CD pipelines and AWS cloud infrastructure that support them.

Experience
5+ years
Focus
Software Engineering
Location
Remote · Brazil
Timezone
UTC-3
Section / 03

Selected work

Systems I've shipped and owned.

2024 · Software Engineer

B2B marketplace modernization

Led the Rails 3.2 → 7.2 modernization of a B2B marketplace at Itaú processing millions of transactions a month, architecting its initial GitHub CI/CD pipelines and AWS deployment infrastructure.

  • Ruby on Rails
  • PostgreSQL
  • AWS
  • GitHub Actions
2023 · Software Engineer

Real-estate platform

Owned features and APIs across Brazil's largest real-estate platform, spanning Rails and React/Next.js, with RSpec/Jest reliability coverage and Python pipelines feeding BigQuery analytics.

  • Next.js
  • React
  • Ruby on Rails
  • ElasticSearch
2022 · Software Engineer

Healthcare APIs

Designed and shipped the Rails APIs powering a dental-practice SaaS, with RSpec-backed test discipline and OpenAPI contracts that kept integrations predictable.

  • Ruby on Rails
  • RSpec
  • OpenAPI
  • MySQL
Section / 04

Stack

The stack behind my recent systems.

Backend01

  • Ruby on Rails
  • TypeScript
  • MySQL
  • ElasticSearch
  • RSpec

Frontend02

  • React
  • Next.js
  • Jest

Infrastructure03

  • AWS
  • Docker
  • Terraform
  • Git
AWS certifications
AWS Certified Cloud PractitionerAWS Certified Developer Associate
Section / 05

Experience

  1. 03/2026 – Current

    Software Engineer

    Itaú Unibanco

    Internalized to continue evolving the B2B marketplace platform directly at Itaú, currently focusing on breaking down the legacy monolith into microservices and scaling core backend operations.

  2. 01/2024 – 03/2026

    Senior Software Engineer

    BRQ Digital Solutions (Case: Itaú)

    Acted on the successful internalization of a high-volume B2B marketplace platform processing millions of transactions a month. Led the full Ruby on Rails 3.2 → 7.2 migration shipped without downtime, and architected the GitHub CI/CD pipelines and AWS deployment infrastructure behind it.

  3. 09/2022 – 12/2023

    Software Engineer

    Órulo

    Owned features and APIs across Brazil's largest real-estate platform, spanning Ruby on Rails and React/Next.js. Hardened reliability with RSpec and Jest coverage, scaled MySQL and ElasticSearch data paths, and built the Python pipelines feeding analytics into BigQuery.

  4. 02/2022 – 09/2022

    Jr Software Engineer

    Dental Office Software

    Designed and shipped the Ruby on Rails APIs powering a dental-practice SaaS. Established RSpec-backed test discipline and OpenAPI contracts that kept integrations predictable, working in Scrum/Kanban with OKRs.

  5. 09/2021 – 02/2022

    Research Internship

    PUC Minas

    Led the technical design and end-to-end delivery of a complete web platform (Ruby on Rails, Vue.js, PostgreSQL) as the project's engineering lead.

  6. 08/2021 – 02/2022

    Web Development Internship

    ESL Sistemas

    Shipped new product capabilities on a Ruby on Rails and Vue.js codebase and kept its PostgreSQL data layer reliable.

Section / 06

Get in touch

[email protected]

Open to interesting freelance and consulting projects. I read every message and reply within a couple of business days.

Location
São Paulo, Brazil
Timezone
UTC-3