Irvin Cossio Chavalier
Hello!  I'm

Irvin Cossio Chavalier

Senior Mobile / Frontend Engineer

Explore My Work↓
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Who I am

About
Me

From Cochabamba, Bolivia, I'm a Senior Mobile & Frontend Engineer with 8+ years of experience shipping products — from fintech wallets and delivery platforms to enterprise mobile apps.

I specialize in cross-platform mobile development with React Native, native Android development with Kotlin, and modern web applications using React + TypeScript. My focus always centers on performance, clean architecture, and crafting seamless user experiences.

I hold a degree in Informatics Engineering from UMSS, where my thesis achieved 90% accuracy in classifying medicinal plants using deep learning. That curiosity for ML never left.

Meta Android Developer

Meta · Coursera · 12 Courses

Meta React Native Developer

Meta · Coursera · 8 Courses

GDG Organizer

Google Developer Group · Cochabamba

Tech stack

React NativeReact Native
ReactReact
TypeScriptTypeScript
JavaScriptJavaScript
AndroidAndroid
KotlinKotlin
GitGit
🇧🇴SpanishNative
🇺🇸EnglishB2

Interests

AI Models

Cloud & local LLMs — Gemma, Claude, Gemini

XR Web

WebXR, immersive 3D browser experiences

Lottie / Figma

Expressive UI animations & micro-interactions

Video Games

Avid gamer, game mechanics inspire my UX thinking

Where I've worked

Work Experience

Plata LLC

Mobile / Frontend Senior Software Engineer

Sep 2025 — PresentUnited States · Remote
  • Maintained code quality across React Native & React JS codebases by triaging and resolving bugs via Linear for a fintech platform.
  • Implemented Wallet and WhatsApp Native integrations into a React Native fintech app serving 200+ users.
  • Reduced ticket-to-PR time by ~30% by integrating AI coding tools (Claude Code, Antigravity) — converting Linear tickets into structured Spec prompts to guide code agents.
React NativeReactJSTypeScriptAI ToolingLinear

Zubale

Mobile / Web Software Engineer

Oct 2024 — Aug 2025Mexico · Remote
  • Built React web control apps for delivery management and task assignment, serving 115 client stores and 300+ drivers across 7 countries.
  • Engineered end-to-end product-picking and delivery flows with map integrations.
  • Integrated deeplink routing and third-party APIs (calls, messaging, calendar) for seamless cross-app workflows.
  • Maintained platform stability for 300+ active drivers across React and React Native codebases.
ReactJSNextJSReact NativeMaps APITypeScriptJira

Jalasoft

Mobile Software Engineer

Sep 2022 — Jan 2025Cochabamba, Bolivia
  • Delivered an employee time-tracking system adopted by 300 users, building check-in/check-out flows and management dashboards with Android, Kotlin & Jetpack Compose.
  • Engineered a crypto wallet module with QR-based send/receive flows and real-time balance display for 200 users.
  • Built a cross-platform onboarding system (exams, video classes via WebViews) used by 8 employees across React Native, Android and iOS.
  • Mentored 8 engineers across internal onboarding and bootcamp programs.
AndroidKotlinJetpack ComposeReact NativeiOS

Witco (Ex Monbuilding)

Mobile Software Engineer

Aug 2017 — Sep 2022France · Remote
  • Delivered React Native mobile solutions for 20+ enterprise clients including a major bank, entertainment parks, and coworking networks — building native hardware integrations for iOS and Android.
  • Reduced app bundle size by 20% and improved build performance by leading 3 major React Native version migrations over 5 years.
  • Onboarded and mentored 4 engineers, tracking their technical growth milestones.
React NativeiOSAndroidNative ModulesTypeScript
F

Freelance

FullStack Software Engineer

Jan 2017 — Aug 2017Cochabamba, Bolivia
  • Built backend features for a Pharmacy management system using Ruby on Rails and Angular.
  • Developed and iterated a grocery delivery app through multiple rebranding cycles.
  • Automated web scraping pipelines with Ruby & JavaScript for ML training data collection.
Ruby on RailsAngularJavaScript

Community

Google Developer Group Cochabamba

Organizer & Volunteer

Jul 2022 — PresentCochabamba, Bolivia
  • Organized community tech events, growing local developer engagement in Cochabamba.
  • Delivered workshops on Android development and TypeScript to the local tech community.

What I've built

Open Source Projects

AI / ML Research2024

MediPlant AI

Deep Learning · Thesis Project

90%Accuracy

Engineered a convolutional neural network for automatic classification of medicinal plant images. Trained on a custom dataset achieving 90% accuracy using artificial neural networks.

PythonTensorFlowCNNOpenCVScikit-learn
Web + AI2026

Pokemon Playeable Gemma 4

AI · Gemma 4 · JS

AIOllama

Playable pokemon game with RL and RNN using AI .

ReactJSGemma 4RNNRL

Education

Informatics Engineer

Universidad Mayor de San Simón · Cochabamba, Bolivia

Graduated April 2024

Thesis: Engineered a deep learning model for automatic classification of medicinal plant images, achieving 90% accuracy using artificial neural networks.

Let's talk

Get In Touch

Whether you're looking for a senior mobile engineer, want to collaborate on an AI-powered project, or just want to connect — my inbox is always open.

Open to senior / staff engineer opportunities