Greylin Arias-Montiel

Software Engineer

Upwork

Feb 2025 - Current (1 year 9 months)

• Developed cross-platform mobile applications using React Native and Flutter. • Developed mobile features using Xamarin. • Collaborated on a project using .NET MAUI to build a cross platform task manager application.

Sr. Mobile Developer

Nextern

Nov 2021 - Dec 2024 (3 years 2 months)

• Participated in Agile ceremonies including sprint planning, story point estimation, retrospectives, and daily stand-ups. • Integrated Mobile apps with medical hardware using secure protocols. • Secured sensitive data using Keychain, CryptoKit, Secure En clave, and HTTPS. Integrated AWS Cognito and API Gateway for authentication and compliance. • Leveraged AI tools like GitHub Copilot to enhance productiv ity and code quality. • Built robust CI/CD pipelines using GitHub Actions and Codemagic to automate testing and deploy to TestFlight and the App Store.

Sr. Mobile App Developer

Evertec

Dec 2019 - Nov 2021 (2 years)

• Mentored junior developers and conducted code reviews to ensure consistency, performance, and adherence to best prac tices. • Developed and maintained banking apps for iOS using Swift, working closely with cross-functional teams. • Ensured functionality and quality through XCTest/XCUITest (iOS) and JUnit/Espresso (Android). • Managed app signing and deployment to the App Store. • Integrated CI pipelines to streamline development workflows. • Applied advanced iOS frameworks including Core Data and background task management to deliver smooth, efficient apps with great UX.

Mobile Developer Enginee

GBM

May 2018 - Dec 2019 (1 year 8 months)

• Designed and developed Captapp, a sport fishing iOS app with cloud support via AWS DynamoDB. • Built a Swift-based app using Realm for offline storage and implemented seamless data synchronization with REST APIs and Google Maps. • Improved app architecture and added new features to en hance scalability and performance.

iOS/Android Mobile Developer

Fiserv

Jan 2014 - Jan 2018 (4 years 1 month)

• Applied SOLID principles and multithreaded programming using GCD and OperationQueue for responsive, high-traffic banking apps. • Developed and maintained iOS banking apps using Objective C and Java. • Designed and implemented UI/UX features for native applica tions. • Integrated and maintained various SDKs and iOS libraries in cluding ReactiveCocoa, SwiftUI, Combine, and Realm. • Led app migration and optimization initiatives. • Managed App Store submission and deployment. • Automated deployment processes using Jenkins. • Diagnosed and resolved critical issues under tight deadlines. • Partnered with cross-functional teams (Product, Design, QA) to prioritize user-first features and align technical execution with business goals.

iOS/Android Mobile Developer

Cecropia Solutions

Nov 2012 - Dec 2014 (2 years 2 months)

• Developed Objective-C iOS apps using storyboards and dy namic data for MapMyDiet, a nutrition-tracking application. • Contributed to a home security app at Chaotic Moon Stu dios, focusing on Notification Management, Background Pro cessing, and multithreading using DispatchQueue and Opera tionQueue. • Designed models and architecture to ensure cross-platform consistency between iOS and Android.

S

Mobile Developer

SourceTrace

Apr 2011 - Oct 2012 (1 year 7 months)

• Developed the AgriSolution app to operate in both online and offline environments. • Designed the UI and data collection features using Realm DB with sync to a remote database via JSON. • Built a dynamic UI editor to enable runtime form generation.

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Software Developer

AWT Software CR

Jun 2008 - Apr 2011 (2 years 11 months)

• Developed Java-based desktop software for financial institu tions using ASI Software and Objectivity/DB. • Designed and implemented the functional architecture for sports betting platforms. • Created custom UI/UX interfaces and resolved issues related to new feature development.

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Software Developer Internship

Instituto Nacional de Biodiversidad (INBIO)

Jan 2008 - May 2008 (5 months)

• Set up a multi-user CMS using Joomla. • Enabled team collaboration through role-based access.

Greylin Arias-Montiel

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Greylin Arias-Montiel

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