Humberto Castro

At Mobi, I developed and maintained the iOS app for Hawaii’s top wireless carrier, improving performance and adding features that boosted engagement. I optimized processes, cutting load times by 20%, and enhanced app stability. Using Swift, SwiftUI, and CI/CD tools, I helped create a smoother, scalable user experience.

At Cogna, I led the architecture and development of the .edu iOS app, optimizing performance and scalability. I implemented RxSwift and CI/CD tools, improving responsiveness by 30%. I also mentored junior developers, conducted code reviews, and helped scale the team. My contributions enhanced stability and user experience for millions of students.

At PayPal, I worked on the Growth Squad, developing and maintaining UI components used by 50M+ users. I optimized key modules, reducing crashes in UI components by 15%, and improved performance with SOLID principles and MVVM architecture. My contributions enhanced app stability and user experience, ensuring a smoother and more reliable interface.

At Cogna Educação, I developed new features for the Ampli app post-merger with Kroton, ensuring scalability and performance. I implemented A/B testing and feature toggles, enabling controlled rollouts and accelerating feature deployment by 40% while reducing crashes. Additionally, I optimized workflows with CI/CD tools, enhancing development efficiency and stability.

I worked on the Loan Squad, enhancing key features and fixing critical bugs to improve the lending experience. I optimized app performance, reducing API response times by 30%, and mentored junior developers through code reviews and technical guidance. By refining workflows and improving stability, I contributed to a more seamless and efficient fintech experience for users.

I developed the company’s iOS app from scratch using an offline-first approach with Realm and GraphQL, improving data reliability. I optimized app performance, reducing startup time by 35%, and led a small team, mentoring junior developers and conducting code reviews. Additionally, I collaborated with product managers to prioritize features, ensuring a scalable and user-friendly edtech solution.

At Indice.in, I developed and maintained the MobEPI iOS app, improving user engagement through Core Animations and MVVM architecture. I optimized app performance, reducing UI rendering time by 25%, and contributed to marketing campaign applications, enhancing interactivity. Additionally, I collaborated with designers and product teams to deliver high-quality, user-focused experiences.

At Apple Developer Academy | Senac, I developed 10+ iOS apps, gaining hands-on experience with native Apple frameworks like CoreData, CoreLocation, and AVFoundation. I collaborated in agile teams, improving problem-solving and rapid prototyping skills. Additionally, I integrated third-party APIs like Google Maps and Facebook SDK, enhancing app functionality and user experience.

Grade: B2

Activities and societies: The program strengthened my speaking, writing, and comprehension skills, allowing me to collaborate more efficiently with international teams and expand opportunities in global markets.

At Expanish Spanish Schools in Barcelona, I achieved a B2 diploma in Spanish, enhancing my ability to communicate effectively in professional and multicultural environments.

Grade: C1

Activities and societies: This certification strengthened my ability to work in global teams, engage in technical discussions, and contribute effectively to international projects in the tech industry.

At New College Group in Manchester, I earned a C1 diploma in English, improving my fluency in professional and technical communication.

Activities and societies: Contributed to SENAC Computer Science Week over four years, gaining in-depth exposure to contemporary software development practices and networking with industry professionals.

Participated in Intel Innovation Week to gain insights into cutting-edge technologies relevant to iOS application development. Engaged in multiple hackathons, including those organized by Reckitt Benckiser and IBM, fostering skills in rapid prototyping and collaborative problem-solving, useful for app development. Final Assessment Project focused on artificial intelligence applications in the Braz

Activities and societies: Completed an IT course with a focus on software development, gaining expertise in Java and C#.

Represented school at the SENAI SP Skills 2013, securing 4th place in the IT category, highlighting academic excellence and competitive skills. Engaged in study groups focused on Android development, marking the beginning of mobile development proficiency.