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Jesús Daniel Medina Cruz

Staff / Senior Android Platform Engineer | Client Architecture & SDK Internals
jesus.daniel.medina.cruz@gmail.com| +14704061747| San Leandro, CA (San Francisco Bay Area)| jesusdmedinac.com
LinkedIn: jesusdmedinacWebsite: jesusdmedinac.comGitHub: jesusdmedinac

Summary

Staff / Senior Android Software Engineer with 10 years of experience architecting high-scale client platforms, consumer financial interfaces, and modular native systems on Google Play. Deep expertise in Android SDK internals, Jetpack Compose, application lifecycle, reactive state management (Coroutines, StateFlow), and low-latency client performance (sub-16ms touch-to-render pipelines). Proven track record leading enterprise platform modernizations at Wells Fargo serving millions of daily active users, maintaining 99.9% crash-free reliability, and building developer velocity tooling (json-to-compose) in the San Francisco Bay Area.

Experience

Wells Fargo — Senior UI Engineer (Client Platform)
2025-01 to Present
  • Architected a centralized, 100% testable navigation framework consolidating 10+ fragmented entry points, eliminating architectural debt and regression risks across core financial workflows.
  • Spearheaded the enterprise-wide UI modernization roadmap, leading the migration of legacy XML layouts to Jetpack Compose while enforcing Clean Architecture, MVVM, and strict unidirectional data flow (UDF).
  • Engineered robust error-handling, session recovery, and client-side validation mechanisms ensuring zero transaction leakage during network intermittency.
  • Mentored engineering teams on modern reactive Android paradigms (Coroutines, StateFlow, Compose state management) and integrated AI developer tooling to accelerate team delivery velocity.
Applied Skills: Jetpack Compose, Android SDK Internals, Clean Architecture, Unidirectional Data Flow, Kotlin Coroutines, Developer Velocity
Academia Desde0 — Senior Mobile Developer & Instructor
2024-02 to 2024-12
  • Upskilled 20+ developers in modern mobile architecture by designing and delivering a curriculum focused on Android SDK, Jetpack Compose, and Clean Architecture.
  • Decreased defect density by 30% across software projects through the strict implementation of Test-Driven Development (TDD) and automated test harnesses.
  • Established collaborative engineering culture by instituting structured pair programming and agile code review cycles.
Applied Skills: Technical Mentorship, TDD, Clean Architecture, Kotlin
Bubble — Senior Android Software Consultant (Fintech & Mobile Platforms)
2021-03 to 2024-02
  • Bitso (Fintech): Owned the cross-platform integration of user engagement SDKs using Kotlin Multiplatform across Android and iOS.
  • Dexcom (Medical): Championed robust testing practices and SDK development for high-trust health apps, maintaining 99.94% crash-free sessions.
  • Spearheaded Android codebase modernization, migrating legacy monolithic architectures into modular Kotlin packages and reducing technical debt by 31%.
  • Maintained 99.9% crash-free sessions across millions of app sessions by establishing robust error-handling boundaries and automated regression suites.
  • Created custom Gradle plugins to standardize build configurations and automated testing suites across engineering squads.
Applied Skills: Fintech Reliability, Modularization, Dependency Injection, Custom Gradle Plugins, Turbine
Insulet Corporation — Senior Mobile Engineer
2019-11 to 2021-03
  • Delivered continuous health monitoring by designing a high-concurrency client data processing pipeline with low-latency background updates.
  • Reduced app memory footprint by 35% and eliminated UI stutter by isolating background telemetry processing into dedicated memory-optimized domain layers.
  • Streamlined shared platform layers using Kotlin and Java to maximize code reuse across mobile clients.
Applied Skills: High Concurrency, Low Latency, Memory Optimization, Android SDK, Java, Kotlin
arkusnexus — Senior Mobile Developer
2019-04 to 2019-11
  • Executed a 100% successful zero-regression migration from React Native to native Android for the Rosy memory assistant app, improving launch times by 40%.
  • Engineered real-time vehicle telematics and sensor tracking systems for dynamic insurtech pricing models.
Applied Skills: Android SDK, React Native Migration, Telematics, Performance Optimization
Compus Sistemas Express — Software Developer
2014-07 to 2017-07
  • Boosted development velocity for internal projects by creating reusable SDKs and service clients to standardize data access.
Applied Skills: Android, Java, SDK Design, Enterprise Architecture

Skills & Expertise

Android Platform & SDK Internals
Android SDK, Jetpack Compose, Kotlin Coroutines, StateFlow, Clean Architecture, Unidirectional Data Flow (UDF), Modularization, Developer Velocity
Performance, Reliability & Low Latency
Sub-16ms UI Responsiveness, 99.9% Crash-Free Stability, Memory Optimization, LeakCanary & Android Profiler, Strict Thread Discipline, CI/CD (GitHub Actions, Fastlane)
Multiplatform & Modern Client Architecture
Server-Driven UI (SDUI), Kotlin Multiplatform (KMP), TDD (JUnit, MockK, Turbine), Custom Gradle Plugins, Fintech & MedTech Compliance

Key Projects

json-to-compose

High-performance No-Code engine enabling dynamic rendering of native apps across Android, iOS, Desktop, and WASM. Implemented AST parsing and a custom UI tree synchronization layer for Compose Multiplatform.

  • Dynamic UI rendering engine for Compose Multiplatform
  • AST parsing and custom UI tree synchronization layer
  • Cross-platform compilation across Android, iOS, Desktop, Web
Zora

Conversational auto parts marketplace connecting vehicle owners and yards using structured schema calls, local-first SQLDelight persistence, and KMP architecture.

  • Foundation-grade KMP architecture across Android, iOS, and Desktop
  • Local-first persistence using SQLDelight

Education

IUT de La Rochelle — Bachelor in Licence Professionnelle, Informatique Répartie et Mobile
2017-06 to 2018-06
Universidad Tecnológica de Tijuana — Bachelor in Técnico Superior Universitario en TIC, Sistemas Informáticos
2015-06 to 2017-06

Certifications

Compose Expert — DevExpert.io
2025-01
Testing Expert — DevExpert.io
2023-07
Kotlin Expert — DevExpert.io
2022-05
Architect Coders — DevExpert.io
2020-04

Languages

English: Advanced / Professional Working ProficiencySpanish: Native SpeakerFrench: Advanced