English
Brazilian Portuguese
Italian
German
Summary
I’m a backend developer with over 10 years of experience in software development: web, APIs, data modeling. I’m an easy learner, self-taught, organised, detail-oriented. I take ownership and suggest improvements to workflows and processes. I value communication, be it written, spoken and/or async (remote-first approach). I have an “open source” attitude: write good documentation and code comments, share knowledge, collaborate to implement the best solutions. I try to keep up-to-date and experiment with new technologies. Leveraging AI tools in my daily work is a constant learning experience.
My current stack is Golang, Python, FastAPI/Flask, MongoDB, gRPC, PostgreSQL, AWS, Docker, Kubernetes, Ansible, Celery, Redis, on both macOS and Linux. In the past, I have worked with other languages (Kotlin, PHP, C#, C++, ASP.NET), databases (MySQL, Oracle, SQL Server, SQLite) and operating systems (Windows).
Current Skills & Proficiency
Golang
Python 3, FastAPI/Flask, REST API
pytest, TDD, Unit Tests
MongoDB, PostgreSQL
Docker/OrbStack
Amazon AWS, Kubernetes
Celery, Redis
Git, GitHub, GitLab
Linux, Ubuntu, macOS
Bash/shell Scripting
Agile (Scrum, Kanban)
Rust
Projects
Nitpick
- A code quality tool to enforce the same settings across multiple language-independent projects. Written in Python. Uses git-flow, GitHub Actions for CI/CD and semantic-release for automated releases.
logseq-doctor
- Tools to work with Logseq Markdown files: convert to outline, list tasks, etc. Logseq is a privacy-first, open-source platform for knowledge management and note-taking.
Experiences
- Working in the Merchant Data Hub (MDH) team, which owns the indexing and serving components of the Pedregal Atlas system. This product aims to deliver merchant data (offers, stores, selections, categories,, option groups, options) from both DoorDash & Wolt at scale to reliably secure the future of our platform.
- Golang, gRPC, Graph Runner (Kubernetes), Taulu (Cassandra)
- Worked 1 year in the Payments Team, responsible for the cash, chargeback and fraud projects
- Now working in the Delivery as a Service (DaaS) Team: delivery service provided by Wolt to any kind of business (restaurants, shops, etc.)
- Implemented the backend integration of the Vipps payment method in Norway
- Improved the backend API for cash payments (used in 12 countries), replacing multiple Kafka topics by a simpler Kafka setup, consuming events from a single topic, published by the Courier mobile app backend
- Worked in the “Packages” product (peer-to-peer delivery), allowing customers to deliver items to other customers
- Python 3.9 to 3.12, FastAPI, MongoDB, gRPC, PostgreSQL, Kafka, Docker, Kubernetes, Datadog, Grafana, Kotlin,
- Logistics platform to connect customers with carriers in order to deliver cargo through FTL (full-truck loads)
- Collaborated on a project and system-wide change to allow multiple stops to truck routes
- Implemented automated solutions for the Finance department (invoicing, carrier debt emails, etc.)
- Python 3.7, Django REST API, FastAPI, Celery, Docker, Kubernetes, Datadog
- Optimized the invoice adjustment tool (PHP): refactored the code to make it fail-safe and reliable
- Upgraded to Python 3.7 a SalesForce integration script written in Python 2: remodelled to run on Docker, improved SQL queries and overall performance/code quality
- Automated the install of a C#/ASP.NET application using Chocolatey and PowerShell scripts
- Collaborated with the Product team using Jira and Confluence
- Created invoice PDF files with AWS Lambda, replacing manual invoices (Python, NodeJS)
- Accelerated the performance of the Data Warehouse/ETL tool by limiting the initial filter to the current month (BI with Pentaho)
- Maintained AWS infrastructure (EC2 servers, ECS Fargate containers, S3 buckets, ELB)
- Optimized and tuned the PostgreSQL database hosted on Amazon RDS, checking slow queries, deadlocks and indexes (AWS RDS)
- Upgraded the whole platform with the latest software, applying security updates and bug fixes
- Standardized CI/CD using Jenkins Pipelines, showing a better output, making it easier to replay/rebuild jobs (Groovy)
- Built a Python RESTful API from scratch to replace a PHP application (Python 3.6, Flask, PostgreSQL 9.6, SQLAlchemy, Alembic)
- Streamlined asynchronous jobs using a distributed task queue (Celery 4, Redis)
- Shaped a flexible JSON API to be consumed by iOS, Android and web clients
- Conceived a reliable and fail-safe payment component
- Processed and refunded credit card, SEPA, PayPal and Apple Pay transactions via the Adyen payment gateway
- Introduced a comprehensive unit/integration test suite and Sentry monitoring, ensuring safe code changes
- Optimized an algorithm for the “travelling salesman problem” with Python and Google Maps/Matrix API
- Delivered orders to customers on pre-scheduled slots using the least number of drivers and the fastest route
- Assisted the operations team in London with driver routes simulation
- Increased efficiency of the delivery service, avoiding human mistakes in route calculation
- Developed store/shop/retailer selection by using the current GPS location
- Increased performance on geographical SQL queries (PostgreSQL, PostGIS)
- Composed email, SMS messages and automated phone calls using Mandrill, Mailchimp and Nexmo
- Facilitated marketing campaigns and strengthened customer communication channels
- Assembled dev tools to lint and assert proper typing and code quality (PyLint, flake8, MyPy)
- Conceptualized a multi-language application, prepared for expansion to other countries (Flask-Babel, Transifex)
- One of the first Berlin startups to display bilingual content in English and German to customers
- Remodelled container deployment to use ECS Fargate, a serverless technology (Docker, AWS ECS, AWS Fargate)
- Minimized costs with EC2 instances
- Allocated more containers automatically with auto-scaling when the app was not responding
- Designed front-end pages using a Flux-like architecture (Node.js, Riot, Backbone.js, Underscore.js)
- Participated in a collective effort to write the remaining web pages before the initial platform release
- Collaborated with the team using Agile (Scrum/Kanban) with Trello
- Collaborated on the proprietary PHP framework of the company, adding new core classes and improving existing ones
- Authored a hyphenation class for Portuguese words, used to split multiline text on classified ads
- Enhanced a class to deal with master/detail table data, facilitating the creation of admin interfaces
- Conceived a class to manipulate data trees, speeding up data retrieval without using slow recursion techniques
- Supported the migration of newspaper subscriptions from a desktop app (written in Oracle Forms) to a web app (PHP, MySQL)
- Participated on the Paywall project, limiting articles for readers: free access up to N stories per month; above that, only subscribers can read
- First newspaper in Brazil to use this technology in 2012, loosely based on what The New York Times has done in the USA
- Streamlined data processing to generate daily reports of visitor count and unique hits count (MongoDB, MySQL)
- Computed 5 million records per day and up to 90 million records per month
- Implemented a fast search for newspaper articles using a full-text search engine (Sphinx search)
- Guided the team during the migration of classified ads from a proprietary third-party desktop system (Windows, C++) to a web app (PHP, MySQL)
- Overhauled the credit card app, eliminating double charges and failures, saving company money and increasing customer satisfaction
- Integrated the hyphenation module into the ad capture app, reducing the price of the ads for the customers
- Spearheaded the use of tools for code quality and coding standards: Code Sniffer, CI with Jenkins, design patterns
- Redesigned the blacklist app, optimized PL/SQL queries and stored procedures, reducing execution time from hours to minutes
- Orchestrated the conversion of C++ and Visual Basic 6 desktop applications to C#
- Designed a C++ app to concentrate all the department reports, moving code from legacy VB6 apps
- Generated output in different formats: Excel sheets, text files or e-mail
- Connected to different databases: Oracle 11g/10g/9i, Microsoft SQL Server 2005/2000
- Published a C# Windows Service to update the bookstore marketplace inventory, using XML files to transfer data
- Created C# class libraries, OLE/ActiveX/OCX components
- Initiated a C# shared class library, serving as a base for an internal framework
- Developed an OLE C++ 1.52 component interfacing with a third-party 16-bit DLL, enabling it to be used by a VB6 32-bit app
- Led the migration of version control from Microsoft SourceSafe to Subversion
- Maintained standalone Visual Basic 6 applications that interfaced with the third-party classified ads C++ app
- Produced application setup executables for standalone VB6 apps using NSIS (Nullsoft Scriptable Install System)
- Documented internal technical articles and how-tos with Drupal CMS, after trying Joomla and Wordpress (PHP)
Education
I attended university in a non tech-related field. It helped to open up my mind, think different and to see things from another point of view.
Vocational school in which I learned sofware development techniques and a few programming languages:
- C, C++ and Pascal languages, Object-Oriented Programming
- Relational databases
- Scope definition, requirements analysis, logical design, UML diagrams