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duanribeiro/README.md

👋 Hey there, I'm Duan.

Building systems that scale. Helping people do the same.

LinkedIn

🧑‍💻 A little about me

I'm a software engineer and engineering leader based in Brazil, currently working at Shopee.

My career has taken me through financial services, logistics, and compliance, building everything from investment APIs to distributed systems handling millions of daily operations. Go and Python are my go-to tools for backend work, with React for the frontend.

These days, I spend much of my energy helping people grow: supporting their careers, creating opportunities for ownership, and giving teams the clarity they need to do good work.

I like systems that scale, code that makes sense, and teams that grow together.

🎯 What I'm focused on

  • 🌱 People development — turning feedback, mentoring, and career plans into meaningful growth.
  • 🧭 Engineering leadership — connecting technical direction, team capacity, and business priorities.
  • 🧪 Software quality — making automated testing and reliability part of how we build.
  • ⚙️ Scalable systems — keeping performance and maintainability in the same conversation.

🧰 My toolbox

Go Python React Django

PostgreSQL MongoDB Redis

Docker Kubernetes Git

Also part of my day-to-day: microservices, gRPC, messaging, observability, BDD, and test automation.

⚡ Things I've helped build

🏦 Financial systems at scale
Led a team delivering a Central Bank integration that supported the daily validation of 30M+ accounts.

📦 High-volume logistics infrastructure
Worked on fiscal microservices issuing 5M+ transport documents per day, using messaging and gRPC.

🚀 Leaner backend services
Migrated services from Python to Go, reducing allocated memory by more than 80%.

🧪 A shared foundation for quality
Built a unified platform for backend, frontend, and load testing, and introduced BDD to improve test scenarios.

✍️ Articles & thoughts

Beyond the code, I also share what I learn along the way.

Read my articles on LinkedIn →

💬 Let's talk

Always happy to exchange ideas about engineering leadership, growing teams, Go, and software quality.

You can find me on LinkedIn. Say hello!

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  1. stone_exercise stone_exercise Public

    Create a simple Dashboard that shows Running and Stopped containers from a Docker server, and you should also be able to start, stop, delete that containers and create new ones sending the image name.

    Vue

  2. desafio_brasilprev desafio_brasilprev Public

    Develop a hypothetical game very similar to Monopoly, where several of its mechanics have been simplified.

    Python

  3. serasa_exercise serasa_exercise Public

    Choose a company of your daily life that has a web system with authentication. Search for all available invoices and save on a local basis and schedule a new search based on a rule.

    Python

  4. hackathonZL hackathonZL Public

    O hackathon "Se esse bairro fosse nosso? Ideias, desejos e soluções para o Jardim Lapenna"! vai te ajudar a transformar sua ideia de melhoria do bairro em projeto e concorrer a R$ 10 mil para tirá-…

    JavaScript 1

  5. hackathon_previdencia hackathon_previdencia Public

    Como dar um novo conceito e forma para essa previdência privada, para que ela seja mais atrativa e democrática a esse futuro profissional, que pode ser totalmente diferente do que conhecemos hoje?

    Python

  6. shopee_exercise shopee_exercise Public

    Considering that scenario, build a script, implementing the seller's ranking logic, where the user, from the terminal, inputs a Sale item and the output is printed as an updated list of all sales r…

    Python