Senior Android Engineer

Miguel Valdez

San Diego, California, United States ******.**********@*****.*** 803-***-**** in/miguel-valdez-b45709353

SUMMARY

Seasoned Android Engineer with 10+ years of experience designing and delivering high-performance mobile applications using Kotlin, Java, and modern

architectures (MVI, MVVM, MVC).

Partner with clients to turn product visions into scalable, user-focused apps, driving measurable improvements in engagement, retention, and overall user

satisfaction.

Known for solving complex technical and product challenges, ensuring clients and users experience seamless, stress-free interactions.

Expertise in Jetpack Compose, Kotlin Multiplatform (KMP), dependency injection (Hilt, Dagger), and Jetpack components, building maintainable and

efficient codebases that support long-term product growth.

Skilled in CI/CD automation, Google Play Store deployments, real-time data synchronization (WebSockets, Firebase), and third-party SDK integrations,

optimizing delivery and operational efficiency.

Leverage AI/ML techniques for personalization, analytics, and feature optimization, enabling data-driven decisions and enhancing in-app engagement.

Experienced in leading cross-functional teams in Agile environments, mentoring engineers, and delivering high-quality mobile solutions that maximize

user satisfaction and business impact.

EXPERIENCE

Senior Android Engineer Slalom Denver, CO August 2021 - April 2026

Led the migration from MVVM to MVI architecture using Jetpack Compose, Kotlin Coroutines and StateFlow, achieving a 30% improvement in state

management efficiency and ensuring a scalable, unidirectional data flow for a codebase serving over 2M active users.

Designed and implemented accessible, modern UI components with Jetpack Compose, incorporating TalkBack support, scalable typography, high-contrast

themes and optimized touch targets, improving accessibility scores by 45% and enhancing experience for users with diverse accessibility needs.

Integrated real-time analytics and AI-driven personalization using Firebase Analytics, Amplitude, Segment and custom ML models, capturing user

interactions, video engagement, and A/B testing results, resulting in 15% higher user retention and 20% boost in engagement.

Developed secure and frictionless authentication flows with OAuth 2.0, Firebase Authentication and biometric login (Face ID, Fingerprint), reducing login

failures and improving overall user trust.

Enhanced content discovery with AI-powered recommendation algorithms, GraphQL API integrations and deep linking, increasing session length and

driving personalized user experiences.

Improved app stability and crash-free rates by 40% using Crashlytics, performance monitoring and structured logging with Timber, quickly identifying and

resolving performance bottlenecks.

Implemented comprehensive testing strategy including Unit Tests (JUnit, MockK), Integration Tests (API & database), End-to-End tests (Espresso,

UIAutomator), and AI-assisted A/B Testing with Firebase Remote Config and Optimizely, reducing post-release defects.

Streamlined CI/CD pipelines using GitHub Actions and Gradle Play Publisher, automating build, testing and staged rollouts, reducing release cycle time and

enabling safer, faster deployments.

Pioneered Kotlin Multiplatform (KMP) implementation, sharing business logic, networking (Ktor) and data persistence (SQLDelight) across Android and

iOS, reducing duplicated development effort while ensuring cross-platform consistency.

Collaborated closely with designers, backend engineers, and QA in Agile workflows, leveraging Jira and Confluence to optimize team efficiency, improve

sprint delivery and mentor junior developers on modern Android and AI-integrated techniques.

Android Engineer Siri Info Solutions Edison, NJ July 2017 - July 2021

Developed and optimized a feature-rich eCommerce application using Kotlin, Java, MVVM architecture, and Jetpack components, ensuring a seamless

shopping experience with high performance and maintainability.

Implemented a personalized shopping experience by integrating REST APIs, Firebase Remote Config, and recommendation engines, enabling real-time

product suggestions based on user behavior and purchase history.

Designed and built an efficient and scalable checkout system using Google Pay, Stripe, and PayPal SDKs, supporting multiple payment methods, secure

transactions, and seamless one-click purchases.

Integrated Google Maps SDK to enhance location-based services, enabling real-time store locators, route navigation, and geofencing for personalized

shopping experiences, while also implementing a feature-rich chat system using WebSockets and Firebase Firestore to support real-time customer support

and order-related inquiries.

Enhanced product search and filtering capabilities by integrating Elasticsearch and Firebase Firestore, ensuring fast, relevant search results and category-

based filtering for improved user experience.

Developed a robust cart and order management system using Room Database, WorkManager, and LiveData, enabling offline cart persistence, real-time

order tracking, and automated background synchronization.

Optimized app performance and startup time by implementing Jetpack App Startup, ProGuard, and R8 optimizations, reducing load times and improving

overall efficiency.

Implemented push notifications and in-app messaging using Firebase Cloud Messaging (FCM) and Airship, improving user engagement by alerting

customers about promotions, abandoned carts, and order updates.

Built a scalable multi-module architecture to improve maintainability, enabling faster development cycles and easier feature additions using Modular

Feature Modules.

Automated CI/CD workflows with Bitrise and GitHub Actions, streamlining builds, testing, and Play Store deployments with internal testing tracks, staged

rollouts, and automated versioning.

Android Engineer Chetu, Inc Tempe, AZ July 2014 - June 2017

Developed and maintained a scalable social networking app using Java, Android SDK, and MVC architecture, ensuring a seamless user experience with

features such as media sharing, friend connections, and user-generated content.

Implemented real-time messaging and notifications using Firebase Realtime Database, WebSockets, and Firebase Cloud Messaging (FCM), enabling instant

chat, message delivery status updates, and push notifications for user interactions.

Designed and developed a location-based friend discovery feature using Google Maps SDK and Geofencing API, allowing users to find and connect with

people nearby, check-in at locations, and tag events with geolocation.

Integrated OAuth 2.0 authentication with Facebook, Google, and Twitter SDKs, enabling secure and seamless social login, account linking, and user profile

synchronization.

Built an optimized media sharing system using OkHttp, Retrofit, and Glide, supporting image and video uploads, automatic compression, caching, and fast

retrieval from cloud storage solutions including AWS S3.

Implemented a user engagement system with likes, comments, shares, and post reactions, using RecyclerView with DiffUtil and Room Database, ensuring

smooth UI interactions and offline data persistence.

Enhanced security and privacy features by implementing AES encryption, token-based authentication (JWT), and GDPR-compliant user data management,

allowing users to control profile visibility, block users, and manage permissions.

EDUCATION

Bachelors of Science, Computer Science University of Southern California Los Angeles, CA 2014

CERTIFICATIONS

Android Certified Application Engineer Android ATC

SKILLS

Programming Languages & Frameworks:

Java, Kotlin, C++

Jetpack Compose, XML

Kotlin Multiplatform (KMP)

Architecture & Design Patterns:

MVI, MVVM, MVC

Clean Architecture

Modularization & Multi-Module Architecture

Android Development:

Android SDK, Jetpack Components (LiveData, ViewModel, Navigation, Room, WorkManager, DataStore)

Jetpack Compose & Material 3

Dependency Injection (Hilt, Dagger 2)

Coroutines & Flow, RxJava for asynchronous programming

Networking (Retrofit, OkHttp, WebSockets, GraphQL)

Local Data Storage (Room Database, SharedPreferences, DataStore, SQLDelight)

Google Play Services (Location API, Maps SDK, Geofencing, Firebase Services)

Testing & Debugging:

Unit Testing (JUnit, Mockito, MockK)

UI Testing (Espresso, UIAutomator)

A/B Testing (Firebase Remote Config, Optimizely)

Crash Reporting & Monitoring (Firebase Crashlytics, Sentry, Timber Logging)

CI/CD & Deployment:

CI/CD Pipelines (Bitrise, GitHub Actions, Jenkins, Fastlane, Gradle Play Publisher)

Google Play Store Release Management (Internal Testing, Beta, Staged Rollout)

Security & Performance Optimization:

Authentication (OAuth 2.0, Firebase Authentication, Biometric API)

Data Encryption (AES, SSL Pinning, JWT Authentication)

App Performance Optimization (ProGuard, R8, Jetpack App Startup, Memory Management, ANR Prevention)

Third-Party Integrations & APIs:

Google Maps, Firebase Services (FCM, Firestore, Remote Config, Analytics)

Payment Gateways (Google Pay, Stripe, PayPal, UPI)

Social Media SDKs (Facebook, Google Sign-In, Twitter API)

Agile & Collaboration Tools:

Scrum, Kanban, Jira, Confluence

Git, Bitbucket, GitHub, GitLab

Code Review & Pair Programming

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