Jesus Marcano

(Engaged across multiple client accounts, including B2B contracts managed via Parallel, and internal development projects)

• Responsible for enhancing user experience and minimizing critical errors through the development of high-quality Android and iOS applications adhering to company standards.

• Tasked with developing key backend functionalities for diverse projects using Python, Haskell, and Appwrite.

• Created AI agents and built AI-informed chatbots using Python, LangChain, and LangGraph, focusing on customer service applications.

• Led and mentored Android development teams, successfully boosting team productivity and enhancing overall code quality.

• Accountable for increasing application scalability and reducing maintenance effort via strategic refactoring and redesign using modern architectural patterns (MVVM, MVI).

• Successfully integrated advanced NFC, BLE, and payment system technologies to enhance transaction efficiency.

• Implemented comprehensive automated testing (JUnit) and continuous performance analysis, achieving high test coverage and significantly reducing production errors.

Technologies: Android, Kotlin, Java, Swift, SwiftUI, iOS, Flutter, Dart, Jetpack Compose, Dagger Hilt, Python, LangChain, LangGraph, Haskell, Appwrite, Docker, DevOps, Linux, Firebase, Payment Methods, BLE, NFC, Design Patterns, Architectural Patterns (MVVM, MVI), JUnit.

• ● Orchestrated the architectural migration of the Messaging module from shared Adevinta infrastructure to a standalone Leboncoin ecosystem, establishing 100% ownership of conversation lifecycle and data storage.

• ● Redesigned the module's concurrency model, achieving a 40% reduction in response latency by optimizing coroutines, refining data flow, and eliminating redundant network calls.

• ● Engineered scalable features including unread conversation logic, local message drafting, and a robust offline-first database synchronization strategy.

• ● Re-architected socket connections for real-time messaging and implemented new API endpoints to support evolving platform requirements.

Technologies: Android, Kotlin, Jetpack Compose, Coroutines, Flow, RoomDB, WebSockets, REST APIs, MVVM, MVI, Clean Architecture, Git, Gerrit, CI/CD, JUnit.

Main tasks executed in the project:

• Implemented features using RIBs Architecture to enhance modularity and scalability.

• Upgraded the app to be compatible with Kotlin 1.9 and the new version of Apollo GraphQL client.

• Evaluated potential changes to ensure compatibility with Android 15.

• Integrated various APIs to improve app functionality and interoperability.

• Developed new solutions for contact support, enhancing user experience.

• Utilized Dagger Hilt for dependency injection and Jetpack Compose for UI development. My significant contribution to the Helios project was upgrading the application to be compatible with Kotlin 1.9 and the latest Apollo GraphQL client. This involved refactoring code, resolving compatibility issues, and ensuring seamless integration of new features, which improved app performance and maintainabili