Guilherme is available for hire

Guilherme Meira

Verified Expert in Engineering

Back-end Developer

Location

Vitoria - State of Espírito Santo, Brazil

Toptal Member Since

March 4, 2021

Guilherme has been a software developer since 2016 when he completed his master's degree in computer engineering. He has developed and deployed computer vision solutions using OpenCV, C++, and Python, as well as back-end applications using Java and the Spring Framework. Guilherme has delivered innovative solutions related to poker, private jet booking, license plate recognition, and coffee bean image classification.

Linux Spring Java Spring Boot Computer Vision OpenCV Git Spring Security SQL MySQL Hibernate Kotlin Amazon S3 (AWS S3)Amazon Web Services (AWS)Python

Portfolio

Vog App Developers

Java, Spring, Spring Boot, Git, SQL, MySQL, Amazon Web Services (AWS), Hibernate

ENGIS

OpenCV, Python, Java, C++, Git, MySQL, Amazon Web Services (AWS)

Kaffee

Java, Spring, OpenCV, React Native, Bootstrap, Spring Boot, Git, SQL, MySQL...

Experience

OpenCV - 5 years Spring - 5 years Git - 5 years Computer Vision - 5 years Java - 5 years Python - 3 years Kotlin - 3 years React Native - 2 years

Availability

Part-time

Preferred Environment

Linux, IntelliJ IDEA, Spring

The most amazing...

...thing I've developed is license plate recognition software. We built our own dataset, trained the networks, and built the system around them.

Work Experience

Back-end Developer

2020 - PRESENT

Vog App Developers

Developed a back-end server for a poker assistant tool, using Java and Spring Boot.
Designed and implemented a custom binary format for fast memory-mapped access to the large dataset behind the poker assistant tool.
Migrated the Java back end of a private jet booking app and implemented new features integrated with the Salesforce CRM.

Technologies: Java, Spring, Spring Boot, Git, SQL, MySQL, Amazon Web Services (AWS), Hibernate

Senior Developer

2019 - 2020

ENGIS

Created an image dataset, using Amazon Mechanical Turk.
Trained neural networks for license plate recognition, using Python and TensorFlow.
Implemented license plate recognition software in Python with TensorFlow and OpenCV.
Built aspects of face recognition software, using OpenCV and Dlib.
Implemented a fast face-matching algorithm, using CUDA.

Technologies: OpenCV, Python, Java, C++, Git, MySQL, Amazon Web Services (AWS)

Full-stack Developer

2016 - 2019

Kaffee

Developed an image processing algorithm for the classification of raw coffee beans, using OpenCV and C++.
Implemented a Java back end to provide access to the vision algorithms via HTTP.
Developed the front end of a mobile application with React Native to capture pictures of the coffee beans and upload them to the back-end server for classification.
Collected images to build a dataset and trained neural networks, using Caffe and Apache MXNet.
Developed an application for internal company use, using Java, Spring, and Bootstrap.

Technologies: Java, Spring, OpenCV, React Native, Bootstrap, Spring Boot, Git, SQL, MySQL, Amazon Web Services (AWS), Hibernate

Experience

Cofness Coffee Classification App

A mobile app for raw coffee bean classification. I developed the entire system from scratch, wrote the segmentation algorithms, trained neural networks for classification, made the algorithm accessible through a Java back end, and created the front-end app using React Native.

License Plate Recognition Software

A system that analyzes live image feeds in real time to detect, read, and store license plates. I developed the system from scratch, building a dataset of images using Amazon Mechanical Turk, training the neural networks from scratch, and building the place recognition system using Python, OpenCV, and TensorFlow.

Squidtool Poker Assistant

Squidtool helps poker players during the preflop stage of a game. I developed the back end from scratch, using Java and Spring. The method behind Squidtool relies on a large dataset that needs to be accessed quickly. I designed and implemented a binary format to store the dataset in an easily searchable way. The file is then memory-mapped for fast, random access.

Skillset

Languages

Java, Kotlin, SQL, Python, C++, Java 11

Frameworks

Spring, Spring Boot, Spring Security, Hibernate, React Native, Bootstrap

Platforms

Linux, AWS Elastic Beanstalk, Amazon Web Services (AWS)

Libraries/APIs

OpenCV, TensorFlow

Tools

IntelliJ IDEA, Git

Storage

MySQL, Amazon S3 (AWS S3)

Other

Computer Vision, Computer Engineering, Software Development

Education

2014 - 2016

Master's Degree in Computer Engineering

Worcester Polytechnic Institute - Worcester, MA, USA

2009 - 2014

Bachelor's Degree in Computer Engineering

Federal University of Espírito Santo - Espírito Santo, ES, Brazil

Certifications

APRIL 2021 - PRESENT

Oracle Certified Professional

Oracle

Collaboration That Works

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