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Hi, I’m Jesus Velazquez Leccese, a Mobile Engineer focused on building fast, reliable banking apps for millions of users. I specialize in native iOS and Android development, with Kotlin, Java, and Swift at the core of my toolkit. I love designing scalable mobile architectures (MVVM, modular patterns, Redux-inspired approaches), integrating REST APIs, and delivering delightful user experiences. I thrive in Agile teams and enjoy shaping end-to-end solutions with CI/CD, automated testing, and close collaboration with backend engineers.…Hi, I’m Jesus Velazquez Leccese, a Mobile Engineer focused on building fast, reliable banking apps for millions of users. I specialize in native iOS and Android development, with Kotlin, Java, and Swift at the core of my toolkit. I love designing scalable mobile architectures (MVVM, modular patterns, Redux-inspired approaches), integrating REST APIs, and delivering delightful user experiences. I thrive in Agile teams and enjoy shaping end-to-end solutions with CI/CD, automated testing, and close collaboration with backend engineers.

Jesus Velazquez

App Developer, Full Stack Developer, Web Developer, +2

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Hi, I’m Jesus Velazquez Leccese, a Mobile Engineer focused on building fast, reliable banking apps for millions of users. I specialize in native iOS and Android development, with Kotlin, Java, and Swift at the core of my toolkit. I love designing scalable mobile architectures (MVVM, modular patterns, Redux-inspired approaches), integrating REST APIs, and delivering delightful user experiences. I thrive in Agile teams and enjoy shaping end-to-end solutions with CI/CD, automated testing, and close collaboration with backend engineers.…Hi, I’m Jesus Velazquez Leccese, a Mobile Engineer focused on building fast, reliable banking apps for millions of users. I specialize in native iOS and Android development, with Kotlin, Java, and Swift at the core of my toolkit. I love designing scalable mobile architectures (MVVM, modular patterns, Redux-inspired approaches), integrating REST APIs, and delivering delightful user experiences. I thrive in Agile teams and enjoy shaping end-to-end solutions with CI/CD, automated testing, and close collaboration with backend engineers.

Available to hire

Hi, I’m Jesus Velazquez Leccese, a Mobile Engineer focused on building fast, reliable banking apps for millions of users. I specialize in native iOS and Android development, with Kotlin, Java, and Swift at the core of my toolkit.

I love designing scalable mobile architectures (MVVM, modular patterns, Redux-inspired approaches), integrating REST APIs, and delivering delightful user experiences. I thrive in Agile teams and enjoy shaping end-to-end solutions with CI/CD, automated testing, and close collaboration with backend engineers.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

English

Advanced

Spanish; Castilian

Fluent

Italian

Advanced

Work Experience

Mobile Developer at VASS - Spain

March 31, 2025 - July 30, 2025

Developed and maintained Imagin and CaixaBankNow apps using Kotlin, Java, and Swift, serving over 10 million users with high reliability and performance in banking and financial services. Contributed to the migration of Android views from XML with Java to Jetpack Compose with Kotlin and worked with UIKit on iOS. Applied MVVM architecture and Dagger for dependency injection on Android; managed dependencies on iOS using CocoaPods. Led development and maintenance of a shared internal library for Android and iOS to unify components and reduce duplication. Integrated private and third-party RESTful APIs into modular app features. Maintained CI/CD pipelines with Jenkins and App Center for automated builds, testing, and distribution. Implemented unit and UI testing strategies to ensure performance, stability, and maintainability. Worked in Agile/Scrum using Rally, documented features in Confluence, collaborated using Figma, and participated in code reviews.

Intern - Operations Department at Tiendeo - Spain

September 30, 2018 - July 30, 2025

Maintained and optimized internal databases, automating data cleaning and validation to improve information quality for digital marketing.

Mobile Developer at VASS - Spain

January 1, 2022 - March 31, 2025

Developed and maintained large-scale banking applications (10M+ users) using Kotlin, Java, and Swift. Built iOS features using Swift, UIKit, and SwiftUI, focusing on performance, scalability, and user experience. Developed Android features using Kotlin and Java, contributing to application stability and UI improvements. Applied modular architectures (MVVM and Redux-inspired patterns) to ensure maintainability and scalability. Integrated and consumed RESTful APIs, handling data flows across application layers. Worked with CI/CD pipelines (Jenkins, App Center) to support automated builds, testing, and deployments. Implemented unit and UI testing strategies to ensure code quality and reliability. Collaborated in Agile/Scrum teams, participating in code reviews and cross-functional development.