Ramon Celestino Ramos Marques, Developer in João Pessoa, Paraíba - State of Paraíba, Brazil
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Ramon Celestino Ramos Marques

Verified Expert  in Engineering

Software Developer

João Pessoa, Paraíba - State of Paraíba, Brazil
Toptal Member Since
July 31, 2021

Ramon has built an industry-leading automated fingerprint system and other solutions that help thousands of people in security, education, transportation, and other domains. He is an adaptable software engineer with 10+ years of experience. As a tech lover, Ramon constantly seeks opportunities to achieve better results by learning and applying the newest concepts. He is passionate about facing new challenges, solving problems, and positively impacting the environment and people's lives.


Python, Kotlin, Azure, Algorithms, Docker, Automated Testing, Kubernetes...
Careportal Inc dba Cedar
Python, Django, React, Tailwind CSS, CI/CD Pipelines, GitHub...
Noremac Media Group, Inc.
Python, JavaScript, APIs, Spotify API, YouTube API, Apple Music API...




Preferred Environment

Visual Studio Code (VS Code), React, Python, Django, Amazon Web Services (AWS)

The most amazing...

...project I've worked on was the first Brazilian automated fingerprint identification system, which was also evaluated as one of the best in the world.

Work Experience

Senior Software Engineer

2021 - PRESENT
  • Developed web applications to create suggestions to improve truck routes using Django and React.
  • Created log files and unit and integration tests to improve the quality of an application.
  • Developed new features for an existing application.
  • Improved the performance and precision of an existing application and fixed several bugs in another.
Technologies: Python, Kotlin, Azure, Algorithms, Docker, Automated Testing, Kubernetes, Rancher, Unit Testing, Integration Testing, APIs, Django, Django REST Framework, Node.js, React, Web Applications, GitHub, SQL, Full-stack, REST APIs, JavaScript, WebSockets, API Integration, Socket.IO, HubSpot, Database Modeling

Full-stack Developer

2022 - 2024
Careportal Inc dba Cedar
  • Created applications to improve communication between patients and healthcare services, also allowing hospitals to send billing information to patients based on criteria.
  • Developed several React and Next.js components, delivering many features used by thousands of users.
  • Handled the front and back end while discussing design details with the design team. Connected applications using GraphQL and REST.
Technologies: Python, Django, React, Tailwind CSS, CI/CD Pipelines, GitHub, Amazon Web Services (AWS), Selenium WebDriver, Selenium, SQL, Full-stack, Next.js, UI Design, UX Design, User Experience (UX), User Interface (UI), REST APIs, GraphQL, JavaScript, OpenAI, Web Scraping, API Integration, HubSpot, Database Modeling

Python and React Developer

2022 - 2022
Noremac Media Group, Inc.
  • Created dashboards from scratch, working on the back and front end to show music and artists' information, such as streams, popularity, and other metrics, connecting with platforms such as Apple, Spotify, YouTube, and others.
  • Used mainly Python/Django and React and many AWS resources, such as RDS, S3, Lambda, SNS, SQS, Cloudwatch, and Textract, to reduce costs. Designed the whole architecture, thinking mainly about serverless designs.
  • Contributed to database performance improvements, fixed bugs, and provided support for the app.
  • Integrated the application with multiple APIs from different providers.
  • Used Selenium automation to ingest catalog and music information into the database, as well as other automation tools to reduce human activity and improve company profit.
Technologies: Python, JavaScript, APIs, Spotify API, YouTube API, Apple Music API, Amazon Web Services (AWS), GitHub, Selenium WebDriver, Selenium, SQL, Full-stack, REST APIs, Web Scraping, API Integration, Database Modeling

Full-stack Developer

2021 - 2022
Queen Rania Foundation
  • Developed an app for online learning to allow students to enroll in subjects and programs and the staff to filter the students by grades.
  • Created the application from scratch using Python/Django and React.
  • Verified bugs and supported the application for a couple of months.
Technologies: Python, Django, React, GitHub, SQL, JavaScript

Software Engineer

2016 - 2021
Federal University of Paraíba
  • Created systems for several domains in the university, including academic, human resources, and financial.
  • Integrated software from the federal government into the university.
  • Played a key role in changing the architecture of systems from monolithic to microservices.
  • Managed a five-member team to develop and integrate systems.
Technologies: Java, Spring, Docker, Kubernetes, Git, HTML, JavaScript, CSS, JSF, Hibernate, Python, APIs, TypeScript, React, Back-end, Front-end, Software Engineering, Spring Boot, GitHub, SQL, Database Modeling

Researcher and Software Engineer

2014 - 2021
  • Developed the first Brazilian automated fingerprint integration system.
  • Decreased the error rates of the fingerprint recognition algorithm to less than 0.4%.
  • Created mobile algorithms to identify individuals by fingerprint without touch.
  • Developed facial recognition algorithms to identify thousands of individuals daily.
Technologies: Python, C++, Visual Studio, Azure DevOps, Django, C#, Docker, Kubernetes, Fingerprint Readers, Facial Recognition, Algorithms, Biometrics, Image Processing, Artificial Intelligence (AI), APIs, GitHub

Full-stack Developer

2018 - 2020
Independent Development
  • Developed several web applications for various sectors, including real estate and bakeries.
  • Created unit and integration tests for all applications.
  • Used cloud platforms such AWS to manage and deploy the applications.
Technologies: Python, Django, Django REST Framework, React, Amazon Web Services (AWS), Web Applications, Unit Testing, Integration Testing, APIs, GitHub

Automated Fingerprint Identification System

The first Brazilian automated fingerprint identification system has error rates that compete with the best algorithms in the world. I developed the entire process, including research of biometric traces; feature extraction from fingers; enhancement of digital images; and matching of different images using techniques such as graphs and AI. According to several agencies and labs in the world, the system acquired error rates below 0.4% on individual recognition. It is being used across many domains in Brazil and the world.

Integration of National Process Submission

Integrated federal government software into the Federal University of Paraíba's system, enabling the university to send and receive processes from any government agency. I used a lot of API concepts to get the data and adapt it to the local reality. This integration eliminated more than 90% of the costs for using paper and sending faxes.

Improvement of GPS Data to Suggest Different Routes

Made significant contributions to a project focused on managing the GPS data collected from equipment and vehicles to suggest and create better routes, which would increase the benefits and profits for users.
2016 - 2018

Master's Degree in Computer Science

Federal University of Paraíba - João Pessoa, Paraíba, Brazil

2010 - 2015

Bachelor's Degree in Computer Science

Federal University of Paraíba - João Pessoa, Paraíba, Brazil


React, Selenium WebDriver, REST APIs, Socket.IO, Node.js, Spotify API, YouTube API, Apple Music API


Git, GitHub, PyCharm, IntelliJ IDEA, Visual Studio


Django, Django REST Framework, Spring, Tailwind CSS, Selenium, Next.js, JSF, Hibernate, Spring Boot


Java, Python, JavaScript, SQL, TypeScript, GraphQL, HTML, CSS, C++, C#, Kotlin


REST, UI Design, UX Design, Azure DevOps, Automated Testing, Unit Testing


Amazon Web Services (AWS), Visual Studio Code (VS Code), Ubuntu, Eclipse, Windows, HubSpot, Docker, Kubernetes, Azure, Rancher


PostgreSQL, Databases, Database Modeling, PostGIS


Software Development, Biometrics, APIs, Back-end, Full-stack, Web Scraping, API Integration, Microsoft Azure, Image Processing, Algorithms, Microsoft Azure Cloud Server, Software Engineering, User Experience (UX), User Interface (UI), WebSockets, OpenAI, Software Design, Springbot, Data Analytics, Integration Testing, Fingerprint Readers, Facial Recognition, Artificial Intelligence (AI), GPS, Web Applications, Front-end, CI/CD Pipelines

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