Luiz Antonio Mitidiero de Moraes Jr., Developer in Campinas - State of São Paulo, Brazil
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Luiz Antonio Mitidiero de Moraes Jr.

Verified Expert  in Engineering

Software Engineer and Developer

Campinas - State of São Paulo, Brazil
Toptal Member Since
August 24, 2015

Luiz is a strategic and execution-oriented engineering executive with 15+ years of building scalable customer-facing products across multiple industries. He specializes in creating and improving engineering culture in remote working environments and is passionate about impacting people's lives. Luiz's core competencies are strategic vision and goal setting, iterative shipping from MVP to a global scale, and system design and architecture with excellent communication skills using the big picture.


Monarch Money
Python, TypeScript, JavaScript, React, Django, Amazon Web Services (AWS)...
University Corporation for Atmospheric Research
Grails, Groovy, Elasticsearch, React, Redux, Redux Toolkit
eCommerce Marketplace (NDA)
Architecture, React, Node.js, eCommerce, JavaScript, Product Management...




Preferred Environment

Trello, Git, Eclipse, IntelliJ IDEA, Linux, MacOS, JetBrains, Jira, Tableau

The most amazing...

...thing I've built is financial software which gives a full representation of Brazilian tax laws and manages tax payments for big companies.

Work Experience

Principal Software Engineer

2023 - PRESENT
Monarch Money
  • Developed an integration with OpenAI ChatGPT with LangChain in Python to build an assistant to answer customers' questions about their financial data.
  • Perform code reviews and help to set quality standards.
  • Led the development of multiple different growth projects and experiments, which so far resulted in a 30x growth.
  • Worked on integrations with multiple financial data providers, including Plaid, Finicity, and MX.
Technologies: Python, TypeScript, JavaScript, React, Django, Amazon Web Services (AWS), Terraform, ChatGPT, LangChain, Artificial Intelligence (AI)

Lead Software Engineer (via Toptal)

2023 - 2023
University Corporation for Atmospheric Research
  • Designed the architecture and built the new portal for searching, managing, and downloading datasets using Grails, Elasticsearch, and React.
  • Created a public-facing API for researchers to fetch and interact with projects and datasets. Also wrote detailed API documentation.
  • Built a new map search mechanism so users can quickly visualize available datasets in the geolocation they need.
  • Led the engineering team of five people, including back-end and front-end engineers, QA, and DevOps, acting as a liaison between the engineering team, the project manager, and the delivery manager.
  • Integrated the new portal with a legacy application.
Technologies: Grails, Groovy, Elasticsearch, React, Redux, Redux Toolkit


2022 - 2023
eCommerce Marketplace (NDA)
  • Oversaw the creation of a multi-vendor eCommerce for construction in React, TypeScript, JavaScript, and GraphQL.
  • Led the development of new features, working closely with the CEO and the engineering team.
  • Provided technical guidance to the engineering team, setting processes and quality standards.
  • Acted to hire and retain talents, being mainly responsible for building the engineering team and defining the engineering culture.
Technologies: Architecture, React, Node.js, eCommerce, JavaScript, Product Management, GraphQL, CTO, TypeScript, Next.js, Design Patterns, Firebase


2022 - 2023
Lifestyle startup (NDA)
  • Led design thinking sessions to help us understand our customers and identify the MVP features.
  • Defined the tech stack and hired the whole engineering team.
  • Managed a team of ten people, including software engineers, designers, and a product manager.
Technologies: Mobile Development, Architecture, Flutter, React Native, Full-stack, Project Management, CTO, Technical Leadership, Python

Engineering Manager | Head of Engineering

2021 - 2023
  • Led the creation of an intelligent voice platform based on NLP from scratch, going from system design and architecture to code reviews and development. It monitors voice chats between patients and nurses and helps them to provide the best service.
  • Managed a team of ten people, including developers, DevOps, data scientists, machine learning engineers, and designers, reporting directly to the CEO.
  • Led the recovery from a ransomware attack, created new security policies and standards, and implemented architectural improvements to prevent data leaks.
  • Implemented new upstream and downstream processes, resulting in a more engaged team with quick turnarounds.
  • Managed an artificial intelligence project, meeting with big healthcare companies—mainly clinics and hospitals—to integrate our product, gathering requirements, writing tickets, and making architectural decisions.
  • Led the integration of our platform with Five9, Twilio, and Zoom.
Technologies: Node.js, NestJS, React, Python, Redux, Machine Learning, Twilio, Five9, JavaScript, TypeScript, Ngrok, Amazon Web Services (AWS), Scrum, Agile, Agile Project Management, Product Management, User Interface (UI), Docker, React Redux, Artificial Intelligence (AI), Talkdesk


2020 - 2022
  • Led a team of 15 people to create a mobile shopping app where users can find nearby stores to buy and receive its products in up to two hours. The concept is similar to Uber Eats, but instead of food offers regular products.
  • Acted as the CTO wearing many hats, working on stuff ranging from infrastructure, and technical planning, to talking to customers, building the product roadmap, and others.
  • Recruited a new engineering team and fostered a healthy culture based on solid communication and transparency.
  • Oversaw the company's data, security, maintenance, and implementation of the company's technical strategy and roadmap.
  • Acted as a liaison between our users, sellers, and the company. I constantly talked to our sellers and users, analyzed the market, and started partnerships and new integrations.
  • Led the system design, performed code reviews, and helped to define the company's standards and best practices.
  • Created a public-facing B2B API for Retail Systems to integrate with the marketplace and enable their clients to sell their products online.
Technologies: PHP, JavaScript, React, React Native, Amazon Web Services (AWS), Firebase, Algolia, TypeScript, iOS, Android, User Interface (UI), Pixel Perfect, Docker

Head of Engineering

2021 - 2021
  • Served as the head of engineering and led the technology and product teams at Higo, a B2B platform that helps small and medium businesses pay and manage their invoices with a real-time view of their cash flow and working capital.
  • Identified the technical debts and technology gaps and built a strategic roadmap to solve them while working on product development.
  • Helped build the new HR department, serve the internal employees, and bring extraordinary talents to the company.
  • Structured a new and fair screening process to hire and onboard new developers.
  • Created a new compensation package structure for tech talents and the strategy to implement it with the current engineering team members.
  • Installed a culture of proactive communication, which improved the visibility and transparency of the technical and product teams.
  • Implemented Scrum across the product and technical teams, which achieved three times more output and outcome.
  • Improved the logging and monitoring systems to provide visibility of the issues as soon as they happened.
  • Started initiatives to make a more inclusive environment with psychological safety and created a strategy to have more diversity in our technical team.
Technologies: Ruby, JavaScript, Agile Project Management, Product Management, Sidekiq, Ruby on Rails (RoR), RSpec, Pixel Perfect

Director of Engineering

2018 - 2021
  • Served as a director of engineering at Toptal and took responsibility for impacting our clients by defining projects, finding the best talents according to the project needs, working as a point of contact, and managing development teams.
  • Worked as the director of engineering with the most significant portfolio and was directly responsible for gross revenue of $20 million in 2020.
  • Took responsibility for managing more than 200 successful projects simultaneously.
  • Took charge of onboarding new team members and helping them to thrive.
  • Took responsibility for supporting our internal product team and having internal initiatives to increase our team's performance.
  • Participated in code reviews and actively collaborated to increase our project's quality.
Technologies: Communication, JavaScript, CSS, Java, Node.js, React, Architecture, Agile Project Management, Angular, AngularJS, Pixel Perfect

Front-end Lead Developer

2017 - 2017
ChatLabs (via Toptal)
  • Led the development of an admin panel to manage an English web school integrated with Facebook Messenger Bot Platform.
Technologies: Bots, Facebook Messenger API, Spring Boot, Java, Angular Material, Angular, User Interface (UI), Pixel Perfect

Front-end Engineer

2017 - 2017
  • Built a web system to easily allow parents to find sitters and manage their bookings.
  • Integrated Stripe, including using credit cards for parents and bank accounts for sitters.
  • Built a responsive UI, working on main mobile devices, tablets, and desktop devices.
  • Architected a chat system for real-time conversation between parents and sitters using Angular 4 and Firebase.
Technologies: Angular Material, Python, JavaScript, CSS, HTML, Angular, User Interface (UI), Pixel Perfect

Software Engineer

2017 - 2017
Silver Arrow (via Toptal)
  • Built a self-service terminal in Angular to be placed at United Kingdom airports to research other countries and get advice or travel insurance before flying.
  • Developed a complex auto-complete feature ready for the touchscreen to find countries by name or keyword.
  • Integrated with the Travel Aware United Kingdom Campaign to find and get countries' information.
  • Integrated with Kioware and a receipt printer to print all country information requested by a user.
Technologies: Google Cloud Platform (GCP), TypeScript, JavaScript, CSS, HTML, Angular, User Interface (UI), Pixel Perfect

Lead Developer

2017 - 2017
Simon Says (via Toptal)
  • Defined technical standards and helped manage the team.
  • Built the whole website structure, as well as designed APIs and AngularJS architecture.
  • Designed a new revamp using a flat design concept.
  • Integrated with Google Analytics, defining events, goals, etc.
  • Helped with product management, defining user goals, tests, and workflows.
Technologies: Angular, Spring Boot, Java, User Interface (UI)

React Developer

2016 - 2016
Autolotto (via Toptal)
  • Worked with React to build an amazing app to enable people to play the Powerball lottery.
Technologies: React, JavaScript, Sass, CSS3, HTML5

Front-end Developer (AngularJS)

2016 - 2016
Mirelz, Inc. (via Toptal)
  • Developed a web app which allows users to design their jewelry style with a designer.
Technologies: AngularJS, Apache Maven, Java, JavaScript, CSS, HTML

Front-end Developer

2016 - 2016
Sweet (via Toptal)
  • Developed a dashboard to manage social network-integrated contests.
  • Updated the website layout with custom themes in Angular Material.
  • Developed the front-end of a marketing application using AngularJs and JavaScript.
Technologies: AngularJS, Less, JavaScript, CSS, HTML

Full-stack Developer

2015 - 2016
  • Built a system that represents the 2016 elections, including candidates, proposals, and priorities on all levels from federal to state and local elections, including statewide measures and local propositions.
  • Integrated candidate pages with mainstream social media like Facebook, Twitter, and YouTube.
  • Created a reusable commenting system for everything related to elections: politicians, propositions, measures, questions, etc.
  • Developed a social network to discuss politics, including features like following people/candidates/subjects, writing articles, and viewing timelines with the main articles according to your preferences and the people you follow.
  • Set up user behavior tracking and analytics platform to improve the product based on the data we collected.
Technologies: Libraries, Amazon S3 (AWS S3), Amazon EC2, Ansible, REST APIs, NoSQL, Spring Boot, Cassandra, Java, Angular


2015 - 2016
PriceBlink (via Toptal)
  • Worked on a Chrome extension and Firefox extension for Priceblink and InvisibleHand.
  • Conducted QA testing for a Chrome extension and a Firefox extension.
  • Created the code in Ruby and JavaScript, fixing bugs in an existing Chrome extension.
Technologies: Ruby, JavaScript, CSS, HTML, Chrome Extensions

AngularJS Web App Developer

2015 - 2016
Stein Labs (via Toptal)
  • Architected a new school management software using JavaScript and AngularJs.
  • Developed a powerful and flexible report tool so users can easily create and save custom reports without any programming knowledge.
  • Created the system architecture for an education software.
  • Integrated software with payment systems for recurring payments.
Technologies: JSON, REST, APIs, JavaScript, CSS, HTML, AngularJS

Principal Software Engineer

2015 - 2016
  • Conducted A/B tests and built a new workflow to sell tickets online that performs 20% more than the old workflow in less than six months.
  • Fine-tuned a web application, which decreased server costs by 6%.
  • Transformed the new workflow for selling tickets in a white-label product that can be sold to other companies. It resulted in an increase of $25 million in revenue in the first year.
Technologies: AngularJS, IIS, REST, C#, .NET, jQuery, JavaScript, CSS3, HTML5

Senior Software Engineer

2014 - 2015
  • Contributed to the development of software for server orchestration for a company, TOTVS.
  • Led the integration of Amazon Web Services and Saltstack.
  • Assisted with data modeling, API and action layers, development, and test automation.
  • Developed a portal where customers can input information about their web systems' cloud structure and are given all price information using providers like Amazon.
Technologies: Shoulda Matchers, jQuery, JavaScript, CSS3, HTML5, PostgreSQL, Unicorn, RSpec, Factory Girl, GrapesJS, Ruby on Rails (RoR), Ruby

Team Lead

2014 - 2014
  • Led a team that developed a marketplace for special and selected products. Our software was developed in a REST architecture using Java, Spring MVC, Amazon S3, Amazon CloudSearch, HTML5, CSS3, JavaScript, and AngularJS.
  • Managed the project and the team, assigning tasks, analyzing requirements, and hiring third-party resources.
  • Created a new web system interface for virtual shopkeepers with a 15% higher retention rate.
  • Developed a crawler that reads web pages and searches for tags to identify virtual shops and their products.
  • Acted as the Scrum Master of the team, being responsible for all Scrum ceremonies. Implemented an Agile culture inside the company.
Technologies: AngularJS, REST, Ajax, JavaScript, CSS3, HTML5, Amazon CloudSearch, Amazon S3 (AWS S3), Sphinx Search Engine, JDBC, SQL, MySQL, Hibernate, Spring Data, Spring MVC, Spring, Servlet, Jakarta Server Pages (JSP), Java

Java Engineer

2012 - 2014
  • Worked with Groovy and Grails developing a financial tax software responsible for giving a full representation of Brazilian Tax Laws for enterprise companies operating in Brazil.
  • Created software to help companies deal with Brazilian taxes in two steps, taking care of main obligations and auxiliary obligations.
  • Led a team to learn, teach, and start implementations with MongoDB in the company.
  • Created reusable front-end form components with Handlebars and jQuery and introduced the use of AngularJs.
  • Gave a short hands-on course about PhoneGap and hybrid mobile app technology to 25 people.
  • Acted as the front-end team leader responsible for creating the software that manages all Brazilian tax obligations in company calendars.
Technologies: Test-driven Development (TDD), Domain-driven Design (DDD), Behavior-driven Development (BDD), jQuery, JavaScript, CSS, HTML, Agile, Scrum, CVS, Git, Spock, GEB, Selenium, Oracle, MongoDB, Grails, Groovy, Hibernate, JSTL, Servlet, Jakarta Server Pages (JSP), Java

Java Developer

2010 - 2012
  • Built software that communicates with agricultural machines using ZigBee, receives and manages data, and gives comprehensible reports for sugar cane plant managers.
  • Developed, as part of a team, primitive map software similar to Google Maps using Java and Adobe Flex to manage sections of sugar cane plantations.
  • Created and maintained the international company website, which is available in English, Spanish, and Portuguese.
  • Architected a simple framework to deal with messages coming from the serial port, which ZigBee uses.
Technologies: Oracle, MySQL, Hibernate, Adobe Flex, jQuery, JavaScript, CSS, HTML, Swing, Java, GIS, ArcGIS

Sweet is a social contest manager that helps companies to grow their brands in social media.


VoteCircle aims to increase transparency in elections around the world. We are operating mainly in American elections; the goal is to inform people about the candidates, their intentions, votes, and statistics. Of course what is online is a simple MVP, but as team leader, I contributed enough to make the company appear on TechCrunch as one of most interesting startups of 2015 Web Summit.

Tech stack:
• Front-end: HTML5, CSS3, JavaScript, Gulp, Bower, and AngularJS
• Back-end: Java, Spring-Boot, Apache Cassandra, NGinx, Amazon S3, EC2, and CloudSearch

Nowa! App

An app to schedule health exams.


An app conceptualized and created by me for social discovery activities.


Mirelz is a app to help jewel designers address their clients.

Autolotto is a layer to play Powerball lottery thru a mobile app/web.

I worked in mobile-web version made in React.

Simon Says
Simon says is an automated transcription service. Basically, you can upload your media files and almost immediately you can get it completely transcribed, with an amazing tool to edit it.

A platform where parents can easily find sitters.
2013 - 2022

Master's Degree in Persuasive Design

UNICAMP (Incomplete) - Campinas, São Paulo, Brazil

2008 - 2011

Bachelor's Degree in Computer Engineering (Information Systems)

Centro Universitário Toledo - Araçatuba, São Paulo, Brazil

2005 - 2007

Technical Degree in Informatics

Salesiano - Araçatuba/SP, Brazil


Microsoft Specialist HTML5 with CSS3 and JavaScript



REST APIs, jQuery, React, Node.js, JSTL, Handlebars, React Redux, JDBC, Facebook Messenger API, Material 2, Sidekiq, ArcGIS


Git, Adobe Photoshop, RSpec, Servlet, Eclipse IDE, Apache Tomcat, Jira, IntelliJ IDEA, Trello, CVS, Shoulda Matchers, Ansible, Apache Maven, Jetty, Five9, Ngrok, JetBrains, Tableau, GIS, Microsoft Access, Terraform, ChatGPT, Redux Toolkit


Grails, Angular, Jakarta Server Pages (JSP), AngularJS, Bootstrap, Spring Boot, Redux, Selenium, Spring, Ruby on Rails (RoR), PhoneGap, Spock, GEB, JUnit, Hibernate, React Native, Next.js, Adobe Flex, Spring MVC, GrapesJS, Factory Girl, .NET, Angular Material, Swing, JSF, NestJS, Flutter, Django


Python, Groovy, CSS, TypeScript, HTML5, Sass, HTML, JavaScript, CSS3, SQL, Ruby, Expression Language (EL), Java, GraphQL, C#, Unicorn, Less, CoffeeScript, PHP, Delphi, Pascal


Agile, REST, Scrum, Design Patterns, Data-driven Development, Object-oriented Design (OOD), Domain-driven Development, Test-driven Development (TDD), Agile Software Development, Behavior-driven Development (BDD), Mobile Development, Agile Project Management


Amazon S3 (AWS S3), NoSQL, MongoDB, MySQL, Spring Data, Sphinx Search Engine, JSON, Cassandra, PostgreSQL, Paradox, Elasticsearch


Linux, Docker, Talkdesk, Eclipse, Amazon EC2, Firebase, Google Cloud Platform (GCP), Oracle, Ubuntu, Android, Algolia, iOS, Twilio, Amazon Web Services (AWS), MacOS

Industry Expertise

Project Management


Ajax, APIs, Architecture, System Design, Communication, eCommerce, CTO, Software Architecture, IT Strategy, Leadership, Technical Leadership, Pixel Perfect, Engineering Management, Angular Bootstrap, Product Management, User Experience (UX), User Interface (UI), Amazon CloudSearch, Domain-driven Design (DDD), Libraries, HTML5 Animations, Bots, Chrome Extensions, Data Analysis, IIS, Algorithms, Machine Learning, Full-stack, LangChain, Artificial Intelligence (AI)

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