Jesus Guerra

Goalvy is a premier planner app designed exclusively for nurses and healthcare professionals, aimed at helping them balance demanding careers with personal well-being. I was instrumental in developing the Minimum Viable Product (MVP) from scratch, leveraging a robust architecture using UIKit, MVVM, Combine, and Coordinators. My responsibilities included integrating an advanced calendar system that syncs with Apple and Google Calendars, implementing a reflective journaling feature with tailored templates, and developing an intuitive task manager and note-taking module with PencilKit for hand-drawn notes.

I also incorporated wellness tracking features and resources tailored for healthcare professionals, ensuring comprehensive user support. Utilizing Firebase, I managed secure data handling with Firestore and Storage, configured custom security rules, and implemented Firebase Authentication for secure user login. Additionally, I developed a custom in-app purchase module for subscription management and integrated Firebase Analytics and Crashlytics to gather user insights and track app performance. My efforts culminated in the successful submission and publication of Goalvy on the App Store.

I had the opportunity to create a unique app that connects users looking to rent or lend various articles. Their innovative model blends for-profit and nonprofit concepts, promoting shared profits that benefit the causes chosen by their community. I built the app from the ground up, employing MVVM and RxSwift as the central design architecture.

My role involved coding and configuring essential core architecture layers, including networking, data processing, and presentation, which served as the backbone of the app's structure. I seamlessly integrated the Stripe SDK to efficiently manage payments, ensuring users had a secure and hassle-free payment experience. In the data processing layer, I harnessed the power of Realm to store and manipulate user-generated and server-consumed data, enhancing data handling and storage efficiency. UI components were meticulously designed and optimized for responsiveness, guaranteeing a consistent user experience across iOS devices.

Throughout the project, I maintained comprehensive technical documentation, simplifying knowledge transfer and supporting future development and maintenance.

I undertook a pivotal role focused on enhancing the app's messaging capabilities. My responsibilities encompassed conducting extensive research to identify and evaluate potential alternatives for the chat module. This involved comprehensive documentation of research findings, offering clear insights into the strengths and weaknesses of each option.

Furthermore, I leveraged my technical expertise to develop a Telegram-like prototype, elevating the chat module's functionality and improving user communication.

I had the privilege of working at VarageSale, a family-friendly app dedicated to buying and selling new and used items locally. During my time there, I was involved in numerous impactful improvements and introduced new features that elevated the platform's functionality. I revamped the 'Deal' feature, providing a refreshed UI and integrating new endpoints for a seamless user experience.

I configured the integration server with Fastlane on CircleCI to streamline development and ensure reliable releases. The result was a more efficient and consistent development process. My contributions, including the UI updates for displaying new deals and addressing stability and performance concerns, led to quantifiable improvements in user engagement, platform reliability, and overall business success.

This app is a personal health assistant where you can schedule medical exams at a particular time in a specific facility based on your geolocation. Sara will provide all the information for the medical exam and will let you know when your results are ready. I started this app from scratch and became the team leader once a new iOS dev joined the team.

Note: I worked from the first version until v1.9.1, posted in November 2017.

As a solo developer, I embarked on creating a comprehensive fitness assistant app, starting from the ground up. This fitness companion delivers crucial exercise information through illustrated images and audio guidance, ensuring users can work out effectively and access essential details to subscribe to fitness programs.

Note: I worked on it from the first version until v3.5, posted in August 2017.

During my tenure with Cannonball, I was an integral part of the team that transformed traditional calendars into captivating social streaming apps. Cannonball injected large images into calendar events and introduced enticing features like Facebook birthday integration with links to friends' profiles, interactive maps for directions, check-ins, and more.

I had the privilege of collaborating on a prayer app, focusing on enhancing its overall performance and stability. This project offered a unique opportunity to work on a spiritual platform, making it accessible and reliable for users. I crafted a custom player module, elevating the media playback experience, and introduced a 'Sync Prayers' module, ensuring users could seamlessly track their spiritual journey across various devices. These enhancements improved the app's functionality and provided a more robust, user-friendly experience. My contributions played a vital role in quantifiable improvements, increasing user engagement, trust, and satisfaction within this spiritual community.

My general contributions include iOS 7 migration and compatible enhancements, extend messages module by implementing new UI/Layou, improve the match card animation and general UI en enhancements, refactoring and bug fixing.

An app that I helped to update and localize. I implemented full iOS7 support, wrote a submodule to handle internet connection outages, added Russian localization, solved UI issues stemming from the operation system update, and improved GPS monitoring.

I have been involved in several improvements and new features, including:

• Normalized transitions between screens to make the app flow more in line with the native screen presentations.
• Squashed several bugs and made code changes to improve the app performance.
• Updated and enhanced UI screens based on the given Zeplin design.
• Integrated Firebase SDK: Analytics and Crashlytics.
• Reworked screens to reuse components and enhanced the ease of use of the controllers.
• Collaborated in the API requirements creation and documentation for the new app modules.

Waydger is an engaging iOS app that offers snackable prediction games across various topics, including sports, entertainment, and daily news. As the lead iOS developer, I transformed the app from a user-testing prototype into a launch-ready state. My responsibilities included extensive UI development using UIKit and leveraging MVVM architecture with RxSwift for reactive programming. I designed and implemented custom UI components, ensuring a seamless and visually appealing user experience.

Project Health is an iOS app built for a healthcare retail initiative that helps users find nearby screening events, complete health-related workflows, and access support resources in one place. It combines event discovery, reporting, and guided assistance to make preventive care more accessible.