Available to hire
Hi, I’m Marco Antonio Martínez Gutiérrez, a versatile Mobile & Full-Stack Developer with over 10 years of experience across Android, iOS, backend, and web development. I love leading technical teams and turning complex business needs into scalable and high-performance applications. I’ve worked in diverse industries such as healthcare, fintech, retail, and marketing, building everything from native mobile apps to full SaaS platforms and interactive games.
I’m passionate about clean architecture, modularization, and continuous integration/delivery, always aiming to deliver great software solutions. Whether it’s developing apps, mentoring teams, or driving project delivery, I bring commitment and expertise to every project I tackle.
Language
Spanish; Castilian
Fluent
English
Advanced
Japanese
Beginner
Work Experience
Android Developer at 10Pearls / RvO Health
June 1, 2024 - March 31, 2025Involved in a mobile health initiative focusing on smoking cessation, diet, and physical activity. Handled bug fixing and modular migration to improve long-term maintainability. Migrated UI to Jetpack Compose and supported dynamic theme integration. Built an onboarding module to trigger reminders for users who hadn’t enabled push notifications. Integrated a proprietary notification framework replacing a legacy Salesforce-based system. Wrote unit tests supporting test coverage initiatives.
Android Developer at Core Park
April 1, 2024 - June 30, 2024Migrated legacy Java-based valet parking app to Jetpack Compose. Maintained and refactored existing modules to improve stability and enforced modern development practices. Supported transition to a journey-based modular structure using MVVM architecture. Implemented reactive programming patterns to modernize workflows and improved code scalability. Contributed to ticket scanning functionality integration using Zebra hardware devices.
Android Developer at Caspex/Walmart AutoCare
February 1, 2023 - December 31, 2023Worked on Walmart’s AutoCare module focusing on oil changes, tires, and batteries services. Handled QA tasks and contributed to defect resolution across critical user flows. Improved test coverage and participated in bug triage and tracking workflows. Maintained UI and adjusted features using XML and MVVM architecture. Wrote unit tests and supported test coverage initiatives.
Android Developer at Velozient/PakEnergy
December 1, 2022 - April 30, 2023Supported logistics app for gas and oil transportation, focused on monitoring barrel inventory and movement. Maintained and stabilized a legacy Java codebase while supporting development of a new cross-platform Flutter app. Assisted with modularization and architecture cleanup for future handoff and migration. Collaborated with client technical team to ensure continuity during migration phase.
Android Developer at Distillery/Tapcart (Shopify mobile platform)
April 1, 2022 - December 31, 2022Worked on a platform generating customizable e-commerce apps for Shopify stores via API integration. Implemented new features and contributed to modular component development in the Android codebase. Collaborated with cross-functional teams for consistent rollout of updates. Operated within structured MVVM architecture; handled UI and data-layer integration. Wrote unit tests supporting test coverage initiatives.
Android Developer at Global Apps/T-Mobile Tuesdays
September 1, 2021 - April 30, 2022Developed T-Mobile’s DoS Days rewards app delivering weekly customer benefits. Participated in full migration from legacy codebase to Jetpack Compose–based architecture. Implemented login and onboarding modules following MVVM and clean architecture patterns. Developed unit and UI tests to ensure reliability and support release cycles.
Android Lead Developer at Global Apps/Cardinal Health
May 1, 2021 - August 31, 2021Led Android development of a pharmaceutical inventory app using MVVM and modern architectures. Coordinated with backend teams and served as main client contact. Mentored junior developers and supported technical decisions. Delivered features using legacy XML UI applying clean architecture best practices.
Android Developer at Insulet
February 1, 2020 - August 31, 2021Contributed to medical Android app embedded in proprietary kiosk-mode device to control insulin pumps. Supported dosage scheduling, nutritional volume calculations, and insulin management. Implemented onboarding modules and user guidance for device setup. Handled full localization and followed FDA compliance protocols. Wrote unit and instrumentation tests ensuring stability under clinical constraints.
Android Lead Developer at Tata Consultancy Services/Citibanamex
November 1, 2018 - February 29, 2020Led mobile development for CODI, a QR-based payment module mandated by Banxico. Designed architecture, gathered requirements, and integrated core services. Directed Android team and collaborated with iOS counterparts for design alignment. Implemented secure token retrieval and registration workflows using MVP and Kotlin. Supported legacy code migration and created POCs for bank executives and partners.
Mobile Developer (Android & iOS) at Ingenia Agency
May 1, 2018 - November 30, 2018Established mobile development practice including technology selection, architecture design, and workflows. Worked on Android (Kotlin), iOS (Swift), and experimented with Flutter for cross-platform development. Led client requirement gathering, estimation, and testing. Developed apps including hotel booking and payroll-based loans. Managed app store submissions for Google Play and App Store.
Mobile Developer (Android & iOS) at Finerio
September 1, 2017 - April 30, 2018Worked in early stages of a personal finance app connecting bank accounts for expense analysis. Developed key Android components in Kotlin and supported iOS initial modules and architecture. Participated in mobile system architecture definition and UI foundation establishment. Ensured cross-platform consistency and collaborative design.
Backend & Mobile Developer at Social Play
July 1, 2016 - July 31, 2017Developed mobile apps and full-stack web solutions for brands like Mercedes-Benz, Jumex, and ASUS. Built lead capture systems, interactive marketing campaigns, and event-based games. Worked on backend (PHP, Node.js) and frontend (JavaScript, HTML, CSS) delivering responsive client solutions. Created registration apps for Android and iOS to support live events and promotions.
Mobile Lead Developer at Consejo Sano (now SameSky)
April 1, 2013 - July 31, 2015Led mobile development team across Android and iOS. Managed feature planning, task distribution, and technical oversight for native apps. Conducted requirements gathering and stakeholder collaboration to define product scope. Developed proof-of-concept mobile solutions using hybrid frameworks. Contributed to web development with landing pages for marketing and acquisition.
Software Developer at ISSSTE
July 1, 2002 - July 31, 2012Developed web and mobile modules supporting healthcare services like clinic locators and enrollment systems. Improved affiliation and eligibility systems for better service delivery. Created interactive web applications using Flash and ActionScript for campaigns and user engagement. Worked on frontend development for internal websites.
Freelance Developer at K9 Publicidad
January 1, 2008 - June 1, 2024Worked on diverse projects including mobile apps, web platforms, and marketing interactive campaigns. Developed cross-platform Android and iOS apps using modern architecture patterns. Built web applications using PHP and MERN stack delivering scalable solutions. Created games and interactive marketing experiences using JavaScript and Unity. Provided technical leadership and project oversight for agency clients.
Android Developer at 10Pearls / RvO Health
June 1, 2024 - March 31, 2025Involved in a mobile health initiative focused on smoking cessation, diet, and physical activity. Handled bug fixing and modular migration to improve long-term maintainability. Worked on UI migration to Jetpack Compose and supported dynamic theme integration. Built an onboarding module that triggered reminders for users who hadn’t enabled push notifications. Integrated a proprietary notification framework, replacing the legacy Salesforce-based system. Wrote unit tests and supported test coverage initiatives using Mockito and JUnit.
Android Developer at Core Park
April 1, 2024 - June 30, 2024Worked on the migration of a legacy Java-based valet parking app to Jetpack Compose. Maintained and refactored existing modules to improve stability and enforce modern development practices. Supported the transition to a journey-based modular structure using MVVM architecture. Implemented reactive programming patterns to modernize workflows and improve code scalability. Contributed to ticket scanning functionality using Zebra hardware devices.
Android Developer at Caspex/Walmart AutoCare
February 1, 2023 - December 31, 2023Worked on Walmart’s AutoCare module, focused on services related to oil changes, tires, and batteries. Handled QA tasks and contributed to defect resolution and quality assurance across critical user flows. Improved test coverage and participated in bug triage and tracking workflows. Focused on UI maintenance and feature adjustments using XML and MVVM architecture. Wrote unit tests and supported test coverage initiatives using Mockito and JUnit.
Android Developer at Velozient/PakEnergy
December 1, 2022 - April 30, 2023Supported a logistics app for gas and oil transportation companies, focused on monitoring barrel inventory and movement. Maintained and stabilized a legacy Java codebase while a new cross-platform app was being developed in Flutter. Assisted with modularization and architecture cleanup in preparation for future handoff and transition. Collaborated with the client’s technical team to ensure continuity during the migration phase.
Android Developer at Distillery/Tapcart (Shopify mobile platform)
April 1, 2022 - December 31, 2022Worked on a mobile platform that generated customizable e-commerce apps for Shopify stores through API integration. Implemented new features and contributed to modular component development across the Android codebase. Collaborated with cross-functional teams to ensure consistent rollout of updates and maintain platform compatibility. Operated within a structured MVVM architecture, handling UI and data-layer integrations. Wrote unit tests and supported test coverage initiatives using Mockito and JUnit.
Android Developer at Global Apps/T-Mobile Tuesdays
September 1, 2021 - April 30, 2022Worked on DoS Days, T-Mobile’s rewards program app, focused on delivering weekly benefits to customers. Participated in the full migration from the legacy codebase to a Jetpack Compose–based architecture. Implemented key modules including login and onboarding, following MVVM principles and clean architecture guidelines. Developed unit and UI tests to support release cycles and ensure app reliability.
Android Lead Developer at Global Apps/Cardinal Health
May 1, 2021 - August 31, 2021Led Android development of a pharmaceutical inventory app using MVVM and modern architecture patterns. Coordinated with backend teams in India and served as the main point of contact with the client. Mentored junior Android developers and supported technical decision-making across modules. Delivered features using legacy XML UI while applying clean architecture best practices.
Android Developer at Insulet
February 1, 2020 - August 31, 2021Contributed to the development and maintenance of a medical Android app embedded in a proprietary kiosk-mode device used to control insulin pumps. Supported key functionalities such as dosage scheduling, nutritional volume calculations, and long-term insulin management. Implemented onboarding modules and guided users through device setup and usage. Handled full localization support, adapting layouts and content to multiple languages and international formats. Followed FDA compliance protocols for medical device software throughout development and validation. Wrote unit tests and conducted instrumentation testing to ensure stability and reliability under clinical constraints.
Android Lead Developer at Tata Consultancy Services/Citibanamex
November 1, 2018 - February 29, 2020Led mobile development for CODI, a QR-based payments module mandated by Banxico, including architecture design, requirements gathering, and core service integration. Directed a small Android team and collaborated closely with the iOS team to align design and feature implementation across platforms. Implemented key service integrations such as secure token retrieval and user registration workflows using MVP and Kotlin. Contributed to legacy code migration efforts and supported modernization of core modules. Developed proof-of-concept apps and user journeys for presentation to bank executives and potential partners, including a custom proposal for Banco Pichincha. Oversaw the full lifecycle of mobile POCs, from technical scoping to UI adaptation and client-facing storytelling.
Mobile Developer (Android & iOS) at Ingenia Agency
May 1, 2018 - November 30, 2018Established the mobile development practice, including technology selection, architecture design, and delivery workflows. Worked across Android (Kotlin) and iOS (Swift), and experimented with Flutter for cross-platform development. Led client requirement gathering, effort estimation, and testing processes across multiple mobile projects. Developed and deployed several apps, including solutions for hotel booking and payroll-based loans. Managed app store submissions and maintenance responsibilities for both Google Play and App Store.
Mobile Developer (Android & iOS) at Finerio
September 1, 2017 - April 30, 2018Worked on the early stages of Finerio, a personal finance app that connects to bank accounts to analyze and categorize user spending. Developed key Android components in Kotlin and supported the iOS team in building initial modules and architecture. Participated in defining the mobile system architecture and establishing UI foundations for both platforms. Contributed to cross-platform consistency and collaborative design decisions across Android and iOS teams.
Backend & Mobile Developer at Social Play
July 1, 2016 - July 31, 2017Developed mobile apps and full-stack web solutions for brands like Mercedes-Benz, Jumex, ASUS, and others. Built lead capture systems, interactive marketing campaigns, and event-based games. Worked across backend (PHP, Node.js) and frontend (JavaScript, HTML, CSS), delivering responsive and client-focused solutions. Created registration apps for Android and iOS, supporting live events and promotional activations.
Mobile Lead Developer at Consejo Sano (now SameSky)
April 1, 2013 - July 31, 2015Led the mobile development team for both Android and iOS platforms. Managed feature planning, task distribution, and technical oversight across native apps (Java for Android; Swift and Objective-C for iOS). Conducted requirements gathering and worked closely with stakeholders to define mobile product scope and priorities. Developed proof-of-concept mobile solutions using hybrid frameworks like PhoneGap and Cordova. Contributed to web efforts by designing and deploying landing pages for marketing and user acquisition campaigns.
Software Developer at ISSSTE
July 1, 2002 - July 31, 2012Developed web and mobile modules to support healthcare services, including clinic locators, enrollment systems, and internal digital tools. Contributed to affiliation and eligibility systems, improving service delivery and user access to health benefits. Created interactive web applications using Flash and ActionScript for internal campaigns and user engagement. Worked on frontend development for internal websites using HTML, CSS, and JavaScript.
Freelance Developer at K9 Publicidad
January 1, 2008 - June 1, 2024Worked on a wide range of projects including mobile apps, web platforms, and interactive campaigns for marketing and experiential activations. Developed cross-platform mobile apps for Android (Kotlin) and iOS (Swift), using modern architecture patterns like MVI, MVVM, and Clean Architecture. Built web applications using PHP and the MERN stack, delivering scalable and responsive solutions. Created games and interactive experiences using JavaScript and Unity for digital marketing campaigns. Provided technical leadership, overseeing external development teams and ensuring project delivery for agency clients.
Android Developer at 10Pearls / RvO Health
January 1, 2024 - January 1, 2025Worked on migration to Jetpack Compose, dynamic theming, and integrating the notification framework for Android applications.
Android Developer at Corepark
January 1, 2024 - December 31, 2024Handled legacy migration, journey-based modularization, and integration of Zebra scanner hardware.
Android Developer at Walmart / Caspex
January 1, 2023 - December 31, 2023Performed UI migration, bug fixing, quality assurance, and ensured unit and UI test coverage for Android apps.
Android Developer at Distillery / Tapcart
January 1, 2022 - December 31, 2022Developed features for Shopify mobile apps using MVVM architecture and Retrofit network library.
Android Lead at Citi Banamex / TCS
January 1, 2018 - December 31, 2020Led the QR payments module development for Banxico compliance, managed legacy migration and created proofs of concept for banking clients.
Mobile Lead at Consejo Sano (SameSky)
January 1, 2013 - December 31, 2015Directed Android and iOS teams in creating healthcare applications including hybrid mobile solutions and landing pages.
Freelance Developer at K9 Publicidad & others
January 1, 2008 - December 31, 2013Carried out full-cycle development for mobile, web, and game projects focused on marketing campaigns and experiential works.
Education
Mathematics at Instituto Politecnico Nacional
July 1, 2010 - July 1, 2010Bachelor’s at Instituto Politécnico Nacional
January 1, 2000 - December 31, 2006Qualifications
Industry Experience
Software & Internet, Gaming, Healthcare, Financial Services, Retail, Transportation & Logistics, Government, Media & Entertainment
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