cover letter

Lucas Carol Sales Duarte

Github: https://github.com/darakeon
Linkedin: https://linkedin.com/in/lc-sales-duarte
Mail: lc.sales.duarte@gmail.com
WhatsApp: +55 11 986 372 833
Cellphone: +351 912 646 993

I have been a software developer since 2007. I've worked already with C# .NET, Node, Kotlin, Frontend technologies (HTML, CSS and Javascript), Python and Rust; TDD and BDD for testing; MySQL, Postgres and SQL Server databases; and Docker, Docker Compose, AWS and GCP for infrastructure.

Before college, I took a web developer course. I worked as a freelancer making some simple websites. One month after starting college, a colleague called me to replace them at the company given my abilities with logic. There I took care of the whole system, from database to frontend. It was a legacy system, using old technologies and practices.

Then I moved to a software development consultancy. There I learned better practices, such as versioning, object oriented programming, agile principles and practices. While there, I started my personal project, called Don't fly Money, a system for personal financial management. It is my sandbox and a great source of learning since then. I used technologies in it that later I would use to solve problems of my companies' clients.

After that, I worked in a company in the payment industry. They had their own product and they used a bunch of new technologies, in development and architecture. There I learned Node and Rust. And I worked with Kotlin for the first time, but I already knew it, because of Don't fly Money.

From 2019 to 2022 I worked for an international software excellence consultant. I took part in four projects at the company. The projects included technologies like Node, Java, microservices, Observability, Grafana, Docker, Typescript and Google AppScripts. Since 2020, because of the world pandemic, I have worked fully remote. I was the security champion of the last team, given my attention to security and details people don't use to notice.

Nowadays I work in the Portuguese branch of a United States company in the backend development team. We use Python for API and Node with Node-RED to develop customizations for clients in the system that connects insurers and distributors. I moved to Portugal to be closer to the company, working in the site once a week.

I'm looking for a new opportunity for professional growth and knowledge improvement, this way developing myself even more with agile teams that focus on software and product quality, security and the needs of people who use the applications we develop.

sincerely and respectfully,
Lucas Carol SD

Skills

.NET .NET Core Agile Amazon Web Services (AWS) Android AWS EC2 AWS Lambda AWS RDS AWS S3 AWS SES Bash BDD Bootstrap C# CI/CD CircleCI CSS Django Docker Docker Compose GCP git Github Actions Gradle HTML Java JavaScript jQuery JUnit Kanban Kotlin Linux Microservices Mobile MySQL NHibernate Nginx Node Node-RED PostgreSQL puppeteer Python React Rust Scrum Selenium SDK Development Specflow SQL SQL Server SQLite SVG Terraform TypeScript Unity3D

Lucas Carol Sales Duarte

Github: https://github.com/darakeon
WhatsApp: +55 11 986 372 833
Linkedin: https://linkedin.com/in/lc-sales-duarte
Cellphone: +351 912 646 993
Mail: lc.sales.duarte@gmail.com

Professional experience

JAN/2023 CURRENT

Habit Intermediary between insurers and distributor companies

Senior Developer Part of product backend development

I work in a team to develop customizations for clients in the product. I develop in Node using the Node-RED tool in the Python core APIs.

Development in browser graphic interface via Node-RED Node
New features and bug fixes in REST API Python

NOV/2023 MAR/2024

Inspira Tecnologia Technology and innovation enterprise which uses agile methodologies and has a continuous learning culture. Develop project in a variety of technical contexts as web systems, mobile apps, consulting and business analysis.

Senior Developer Part Time Backend and Frontend Development

I worked in two projects that was in the need of technical reinforcement, developing, reviewing code and helping on technical decisions.

Client/company relationship program Web System Java, Spring Boot, Postgres, Docker
Covenants register and follow up Web System Java, Spring Boot, Postgres, Docker, React

OCT/2019 DEC/2022

ThoughtWorks IT Consulting

Senior Consultant Client projects consulting

The job was consultancy, development and maintenance of client and internal software. Thoughtworks follows best practices, continuous improvement, pairing, TDD and other agile practices.

The first project was an internal one, to make it easier to understand the health of the kanban boards using a fictional character state to show how the project was. This has helped me improve my Node knowledge. Some months later, I went to a client project that manages the rental and sale of houses and flats. There I had experience with microservices with Java and BFF methodology (backend-for-frontend). Then I went to my first international project, implementing Observability using Grafana and Docker.

The fourth project attended internal clients, using Google AppScript, Docker, Postgres, TypeScript and TDD. In this team, I was the security champion.

I'm recognized as someone that knows git deeply, and people come to me when they have a problem to solve in this matter
When the team needed a security champion, people suggested that it was me, given my attention to details and risks that not everyone is aware to, and this was one of my responsibilities
People praise me for being always alert to people welfare, trying to bring an environment where everyone feels safe

Agile metrics graphical representation project Typescript, Node
Real state agency website Java, Node, Angular
Infrastructure metrics for observability C#, Docker, Grafana
Finantial spreadsheet automation using addon Typescript, Node, Google App Script, Postgres
Web system for enterprise internal mentoring Typescript, Node, Postgres

MAR/2017 AUG/2019

Pagar.me Pagamentos E-commerce payments backend

Senior Developer Maintenance of physical transactions sdks and company core backend

I've worked on some projects while working in Pagar.me. The first of it was a .NET SDK for communicating with payment machines. After that, I was part of the team that was responsible for creating a new unified frontend library for the mother-company of Pagar.me, using React. Then I started the development of integration to use voucher cards in payment machines. I was part of a security improvement the company had to make, when I had to pair with a bunch of different teams to achieve the results. As a last project I went to a team to start a new project, to attend smaller clients that needed payment machines to improve their business and modernize their way to sell their goods.

I was part of the team that started the project to create a default UI for the entire company to develop its websites, in React
I took responsibility and fought for a project to implement something that was promised to a client years before - the client was even threatening to sue out company. After it was approved, I spent 15 days working with no rest to make it happen
I started with two colleagues a new project to develop an application to a new product of the company. They both were novice and I was the only one that knows the language at the company, I was the one that suggested it when the project started

Machines SDK .NET, Kotlin, Rust, Gradle
App to communicate machine with client site .NET
Maintenance at the company core system Node
App of payment and transaction management with physical cards Kotlin, Gradle
Start of new dashboard with company visual identity unification React, Open Source

MAY/2010 NOV/2016

Inspira Tecnologia Technology and innovation enterprise which uses agile methodologies and has a continuous learning culture. Develop project in a variety of technical contexts as web systems, mobile apps, consulting and business analysis.

Analyst and Programmer Client system development and maintenance, from marketing site to more complex web systems

I worked on several projects at Inspira. During my time there I evolved a lot and I grew as a developer and as a person and I had the opportunity to teach other developers.

I took responsibility of 4 project at same time, I had to balance the tasks of the project and priorities
I taught interns in programming languages and development pathways
I started a project in automatic testing with a technology I had learned in my personal project and this is nowadays still used to teach people in the company

Sport and physiotherapy management system .NET, C#, MVC, NHibernate, SQL
NGO organization system .NET, C#, WebForms, TSQL
Energy manager website .NET, C#
Flight company website .NET, C#
Mobile operator marketing site .NET, C#, TSQL
Startup collaboration system .NET, C#, MVC, NHibernate, SQL
Book publishing and courses company e-commerce .NET, C#, NopCommerce, WebForms, EntityFramework
Card transactions system site and desktop app .NET, Windows Forms, C#, MVC, NHibernate, MySQL
Writing and implementation of automated tests to an eletronic contract signing company .NET, C#, SpecFlow

FEB/2007 APR/2010

Grupo Ser HR enterprise to evaluate job candidates. Has an online questionnaires system, both psychological and technical - this one made by clients.

Programmer Maintenance and creation of new features to the questionnaires system.

Starting to replace a colleague, after the second month I took sole responsibility over the entire system: database, backend and frontend. During my years there, I had three people to teach and manage. The technologies I learned there were classic ASP, IIS, SQL, HTML, CSS and Javascript.

I entered to take care of the entire system. I had too little experience and they trusted me to be doing the job by myself from the second month;
I had three other interns as my responsibility;
When I left I still worked with them as freelancer to teach the new developer and solve bugs.

Development and maintenance of web system, backend and frontend ASP, SQL Server, HTML, CSS, Javascript

Academic

2013 2014

SENAC (Serviço Nacional de Aprendizagem Comercial) Post-graduation - Games: Production and Programming

Post graduation focused in Games using Unity 3D. Learned from game project and design, music, modeling and programming.

2011 2011

Brás Figueiredo .NET Core and Advanced Foundation

Course about .NET Framework with Core and Advanced funcionalities

2007 2010

FATEC (Faculdade de Tecnologia de São Paulo) Bachelor Degree in Data Processing Technology (IT)

Analysis and Programming in a number of languages: Pascal, C, Cobol, TSQL. OS Linux and fundamentals of OSs working. System documenting.

2008 2009

Wizard English reading, writing and conversation

Intermediary and advanced levels

2005 2005

SENAC (Serviço Nacional de Aprendizagem Comercial) Web Designer

Web Development with tools Dreamweaver, Fireworks e Flash

Independent projects

2010 CURRENT

Don’t fly Money It is a financial management system built to be a simple way to manage a person cash inflows and outflows

http://dontflymoney.com
https://github.com/darakeon/dfm/

Independent project

Maintainer of the personal financial management system, built with C# .NET Core, Kotlin, Node and Rust. For tests, using BDD, TDD, puppeteer, specflow and roboeletric. Docker for running locally and in the server, RDS DB and EC2 Linux for production. Uses SES, Lambda and S3 for e-mails. One goal is to improve the CI: nowadays it already runs all the tests, the objective is to make it deploy too, becoming a CD.

This is a project I created and I still maintain since 2010
It has a good range of different technologies and I keep the libraries always up to date
I already had to change the server from windows to linux, given the difference between Brazilian Real and US dollar it was becoming too expensive to keep it as windows, so I had to plan and execute with caution the migration from .NET Framework to .NET Core and from Windows to Linux after that

Core library with business logic with automated tests .NET, C#, NHibernate, BDD, Specflow
Website with browser automated tests .NET, C#, MVC, HTML, CSS, javascript, jQuery, Bootstrap, Puppeteer
API .NET, C#, MVC
Android app with automated tests Kotlin, retrofit, junit, robolectric
Database MySQL, AWS RDS
Webserver AWS EC2 / Route53, Docker
Integration with automated tests running at push Circle CI, Docker
E-mail to send notifications to the people who uses the system AWS SES / Lambda / S3

Attended events

Coding For Fun 2007
Agile Vale 2011
Agile Vale 2013
CryptoRave 2014
CryptoRave 2015
Hackaton Mundipagg 2017
CryptoRave 2018
.NET Community Summit 2018 (iMasters)
Android Community Summit 2018 (iMasters)
CryptoRave 2019
AWS Cloud Experience Day Portugal 2023
GET CERTIFIED GCP 2024

Talks - Pagar.me channel - in portuguese

Binary numbers https://www.youtube.com/watch?v=SNnO1ki2t78
Transgender people https://www.youtube.com/watch?v=XAwhx1AZQIU&t
From Java to Kotlin https://www.youtube.com/watch?v=xcCLjD3kJRQ
Regex https://www.youtube.com/watch?v=TPO3GGHME_s
How to remove gender from text (in portuguese it is harder than english) https://www.youtube.com/watch?v=BMQRGt2T-sw