I’m a Mobile Developer with solid experience building Android (Kotlin) and Flutter applications, working across the full development lifecycle — from architecture and implementation to publishing and maintenance in production. I currently work with self-service kiosk systems, POS and PinPad integrations, and electronic payment solutions (TEF / SiTef, credit, debit, and Pix), as well as REST API and ERP integrations. My background includes developing apps from scratch, improving performance and stability, fixing production issues, and continuously evolving existing products. I have a strong focus on clean architecture, best practices, and scalable mobile solutions, always aiming for high performance, reliability, and a great user experience. I’m comfortable working in Agile environments (Scrum/Kanban), collaborating with teams, and taking ownership of features end to end. What sets me apart is my combination of mobile architecture knowledge, real-world payment system experience, and hands-on work with hardware-integrated applications, especially in enterprise and self-service scenarios.

Osmel Santos

I’m a Mobile Developer with solid experience building Android (Kotlin) and Flutter applications, working across the full development lifecycle — from architecture and implementation to publishing and maintenance in production. I currently work with self-service kiosk systems, POS and PinPad integrations, and electronic payment solutions (TEF / SiTef, credit, debit, and Pix), as well as REST API and ERP integrations. My background includes developing apps from scratch, improving performance and stability, fixing production issues, and continuously evolving existing products. I have a strong focus on clean architecture, best practices, and scalable mobile solutions, always aiming for high performance, reliability, and a great user experience. I’m comfortable working in Agile environments (Scrum/Kanban), collaborating with teams, and taking ownership of features end to end. What sets me apart is my combination of mobile architecture knowledge, real-world payment system experience, and hands-on work with hardware-integrated applications, especially in enterprise and self-service scenarios.

Available to hire

I’m a Mobile Developer with solid experience building Android (Kotlin) and Flutter applications, working across the full development lifecycle — from architecture and implementation to publishing and maintenance in production.

I currently work with self-service kiosk systems, POS and PinPad integrations, and electronic payment solutions (TEF / SiTef, credit, debit, and Pix), as well as REST API and ERP integrations. My background includes developing apps from scratch, improving performance and stability, fixing production issues, and continuously evolving existing products.

I have a strong focus on clean architecture, best practices, and scalable mobile solutions, always aiming for high performance, reliability, and a great user experience. I’m comfortable working in Agile environments (Scrum/Kanban), collaborating with teams, and taking ownership of features end to end.

What sets me apart is my combination of mobile architecture knowledge, real-world payment system experience, and hands-on work with hardware-integrated applications, especially in enterprise and self-service scenarios.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Beginner
Beginner
Beginner
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Language

English
Intermediate
Portuguese
Fluent

Work Experience

Mobile Developer at Eptus
September 24, 2022 - Present
Mobile Developer at Public Defender’s Office
July 1, 2021 - July 1, 2024
I was responsible for developing and maintaining mobile applications
Mobile Developer at Eptus
September 24, 2022 - Present
I currently work at an ERP company creating new applications, integrating payment systems such as SiTef, and building solutions for self-service kiosks.
Mobile Developer at EPTUS CORPORATION
October 1, 2022 - Present
Android (Kotlin) and Flutter development for mobile applications; self-service kiosk system development; integration with TEF/Sit ef payment systems (credit, debit, Pix); REST API and ERP integration; ongoing maintenance, bug fixes, and continuous improvements in production; creation, maintenance, and publishing of applications from scratch; Scrum and Kanban methodologies; version control with Git.
Mobile Applications Developer at Public Defender’s Office of the State of Roraima
October 1, 2022 - October 1, 2024
Development and maintenance of mobile applications; bug fixing and technical support; improvements in application stability and usability.

Education

Developer Systems at Claretiano
January 1, 2019 - September 3, 2025
Professional training throughout the course, learning concepts, guidelines, and values.
Computer Science at University of Roraima
September 1, 2020 - September 24, 2025
POSTGRADUATE DEGREE IN MOBILE DEVELOPMENT at Estacio
January 1, 2025 - January 31, 2026

Qualifications

Postgraduate Degree in Mobile Development
January 11, 2030 - January 29, 2026
Bachelor's Degree in Systems Analysis and Development
January 1, 2019 - January 1, 2022

Industry Experience

Education, Software & Internet, Government, Professional Services