Senior Flutter & Fullstack Developer | Expert in Scalable Mobile Apps

Accomplished Senior Flutter Developer passionate about crafting scalable mobile architectures and delivering cross-platform application solutions. With over 8 years of experience across global markets, including Dubai, Silicon Valley, Mexico, Southern Africa, and Canada, I excel in driving projects with robust performance improvements and rapid development cycles.

Pitching an award winning application at the World Summit Awards that selects and promotes local digital innovation improving society.

Key Achievements:
-Team Leadership and Process Improvement: I founded the mobile development team at Jabu Logistics, growing it to over 10 developers. I pioneered a rigorous code review process that maintained a 100% retention rate and achieved zero critical bugs at launch.

-Scalability and User Growth: At Jabu Logistics, I architected features as internal packages for 5 applications, employing clean architecture principles. This approach reduced the time-to-market for new features by 50%. It supported a robust ecosystem that sustained a 200% monthly user increase for 8 consecutive months.

- Cost Reduction and Efficiency Gains: At Gemsdev, my leadership in optimizing mobile app operations cut server costs by 70% and enhanced system performance by 30%, thanks to advanced technology stacks and CI/CD pipelines.

I get excited about opportunities with projects that involve building scalable mobile architectures, integrating advanced technologies, and creating user-friendly applications.

  • Mobile development: Flutter (Expert), Android (Advanced), iOS (Intermediate)

    Programming languages: Dart, Kotlin, Java, Swift.

    Architectural Design: Clean Architecture. Riverpod, BloC, Provider, GetX, MVVM.

    Packages: Get-It, Crypto, DIO, Http, GraphQL, SQFlite, Hive, Shared Preferences, Isar, Sembast, Dartz, Freezed, Hive, Room, Retrofit, Glide, Picasso, LiveData, ViewModel, ExoPlayer, Jetpack, Espresso, JUnit, Mockito.

    Technologies: Firebase, Eleven Labs, DevTools, CI/CD with CodeMagic, GitHub, GitLab, Figma, Jira, Unit Testing, Sentry, Amplitude, Mixpanel.

  • Sr Staff Mobile Engineer - Fullstack Aplazo, CDMX | July 2024 - Present

    Senior Flutter | Android Developer. Phonon X, Silicon Valley | October 2023 - May 2024

    -Performed over 10 code reviews per week, improving code quality and stability.

    -Led the integration of AI functionalities using Eleven Labs for voice cloning, boosting operational capabilities.

    -Improved Android app performance by 20% within two months through strategic use of DevTools and Firebase Performance Monitoring, thereby improving user experience.

    -Employed advanced monitoring tools to diagnose and resolve performance bottlenecks, reducing load times by 40% and increasing app responsiveness, which contributed to a 20% uplift in active user base.

    -Conducted comprehensive load/stress testing and unit/integration/e2e testing, improving testing coverage by 50%, which decreased the number of critical issues by 60% and shortened the QA cycle by 20%.


    Mobile Tech Lead | Senior Flutter Developer Jabu Logistics, Southern Africa | November 2021 - October 2022

    -Founded and grew the mobile development team from zero to 10+ developers in two years, achieving and maintaining a 100% retention rate.

    -Implemented a rigorous pull request review process achieving a record of zero critical bugs at launch.

    -Authored extensive developer documentation accelerating project development by 10%.

    -Architected and implemented modular features as internal packages for 5 applications, utilizing clean architecture principles to ensure reusability across all apps, reducing time-to-market for new features by 50% and supporting a consistent 200% monthly user growth over an 8-month period.

    -Established and managed the CI/CD pipelines using CodeMagic from the ground up, which upheld high deployment standards from inception.

    -Mitigated risks related to data vulnerability by introducing robust encryption, effectively nullifying potential threats to user data privacy.

    Tech Lead | Senior Flutter & Android Developer Gemsdev, Mexico | April 2020 - November 2021

    -Served as a Technical Leader, coordinating efforts across mobile, web, and backend developer teams, successfully leading development and delivery of over three major mobile applications.

    -Reduced server costs by 70% and increased system performance by 30% for key clients by migrating server instances to Lambdas.

    -Decreased development cycle times by 50% through the strategic implementation of CI/CD pipelines.

    -Mentored 8+ developers, guiding them from junior to upper-mid level proficiency via live coding sessions and dedicated problem-solving support. This improved operational efficiency.

    Earlier Positions

    Senior Android developer | Mobile Tech Lead, Host a Pet | Mexico, January 2019 - April 2020

    Upper Intermediate Android Developer, Grin Scooters | Mexico, October 2018 - January 2019

    Intermediate Android Developer, Alpaca Software Development | Mexico, June 2017 - September 2018

    Junior Mobile Developer, Musar | Mexico, November 2016 - June 2017

    Junior Android Developer, Fermat | Dubai, August 2015 - November 2016

  • National Autonomous University of Mexico | UNAM

    Mathematics | 2010 - 2015

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Professional References

  • I want to express my sincere recommendation for Rodrigo, whose performance as a mobile developer and team leader has been nothing short of exemplary. Rodrigo possesses a deep and expansive knowledge of mobile development. His technical proficiency has been a driving force behind the success of our projects. His contributions extend beyond his immediate responsibilities; he is always willing to share his knowledge with peers, fostering a collaborative and educational environment. It is with full confidence that I endorse Rodrigo as an outstanding mobile developer and leader.

    — Antonio Acevedo Bañez, VP of Engineering

  • I was a part of his team for over a year, and he showcased expertise in both Flutter and Native programming. He consistently guided us with professional coding practices and sought scalable solutions for every project. […] I highly recommend him for his excellent team management skills and his prowess as a technically strong developer.

    —Sankar Arumugam, Flutter Developer

  • I've been involved with Roy in several projects in the same company, mainly using Flutter as mobile technology and he has shown the strengths he has all the time. Such as, Flutter knowledge, native development, architecture approaches and many other technical things that are not easy to find in one candidate.

    On the other hand, he has pretty good communications skills, team leadership, partner support, also he helps you to grow you career path. So basically is someone you know and after work with him you are not gonna be the same person and developer, you are gonna grow 200%.

    —Layoneth Pareja Fonseca, Flutter developer

  • Rodrigo was one of my best mentors. With him, I learned a lot about coding. Software architecture is his passion, and he is always careful about design patterns and good practices. He loves and encourages you to try to always think about component reutilization.

    What I most enjoyed learning from him was about leadership in a tech team. He is always ready to listen, help, and teach you.

    I highly recommend Rodrigo Guzman for any roles or responsibilities that involve utilizing his skills as a developer and leader.

    -Francisco Noceda, Senior Flutter Developer