Senior Android Engineer (Kotlin, Compose, BLE)

Martin Osorio

Senior Android Engineer Kotlin Jetpack Compose BLE

Miami, FL Remote 954-***-**** **@************.*** linkedin.com/in/martinosoriolopez github.com/QuasarApps PROFESSIONAL SUMMARY

Senior Android engineer with 12 years in professional software engineering, 9 of them building native Android products across regulated healthcare, retail, and financial services. Deep hands-on Kotlin, Jetpack Compose, MVI and MVVM, Coroutines, Flow, and Bluetooth Low Energy, including patient-facing insulin pump controllers and bio-wearables. Set the engineering standards for a team that grew to 16 Android developers, led tooling that cut environment setup from one week to one hour, and owned regulated documentation that fed an FDA submission. Now co-founder of an independent studio with an AI-native workflow, shipping native Android apps and fullstack web platforms. Fully bilingual in English and Spanish. TECHNICAL SKILLS

Android: Kotlin, Java, Android SDK and app lifecycle, Jetpack Compose (custom components, animations, state-driven UI), Material 3, XML layouts and the legacy View system, Wear OS, Bluetooth Low Energy (BLE), NFC, Room, DataStore, WorkManager, Jetpack Navigation, Retrofit, REST and JSON APIs, push notifications Architecture and concurrency: Clean Architecture, MVVM, MVI, ViewModel, modularization, reusable libraries and internal SDKs, dependency injection (Hilt, Dagger), Kotlin Coroutines, Kotlin Flow, StateFlow, offline-first design, performance profiling and optimization, SQL and NoSQL storage (SQLite, Room, SQLDelight, Firebase, MongoDB) Testing and quality: JUnit, MockK, unit testing, Compose UI testing, Espresso, instrumentation testing, hardware-in- the-loop test harnesses, bug investigation and triage, crash reporting, analytics, and release health monitoring Regulated software: Software Requirements and Design Specifications, FDA submission documentation, independent design review, Jama Connect, medical-device cybersecurity training Technical leadership: Setting patterns and technical direction, design and code review, mentoring and onboarding engineers, authoring coding standards and technical documentation, cross-functional partnership with product, design, backend, hardware, and QA stakeholders

Delivery and tooling: Git, GitHub, GitFlow, Bitbucket, pull request review, GitHub Actions, CI/CD pipelines, Gradle and Kotlin DSL, Google Play publishing, Android Studio, Agile, Scrum, SAFe AI-assisted development: Claude Code, GitHub Copilot, agentic coding workflows, spec-driven development, automated code review, setting team patterns and guardrails for AI tool usage PROFESSIONAL EXPERIENCE

Co-Founder & Principal Android Engineer Quasar Apps LLC Feb 2026 – Present Remote

• Co-founded an independent product studio; own technical direction, architecture, release engineering, and client delivery across a portfolio of Kotlin Android apps and fullstack web platforms.

• Shipped Pulsar to the Google Play Store and built four further products spanning marketplace, farm-share, and industrial operations domains, owning architecture and release engineering for each.

• Build every product offline-first, with Room persistence, WorkManager sync queues with retry and backoff, and reconciliation logic that keeps the app usable and consistent when the network doesn't.

• Practice AI-native development with Claude Code and GitHub Copilot across spec authoring, architecture review, testing, and documentation, keeping clear ownership of quality, security, and what is worth building. Senior Android Developer I Tandem Diabetes Care Apr 2024 – Mar 2026 Remote, United States

• Built the core Bluetooth Low Energy (BLE) communication layer between a patient-facing Android controller app and a connected insulin pump in Kotlin, Coroutines, and Flow, covering pump alerts, malfunction handling, and synchronized notifications.

• Engineered the notification system that manages, displays, and synchronizes alert and malfunction states between pump and app, and developed the pairing and registration flows in Jetpack Compose with MVI.

• Owned the Software Requirements and Software Design Specifications for a regulated medical software system, contributing directly to an FDA submission.

• Joined as the first senior engineer on a team that grew to 16 Android developers across 3 scrum teams; interviewed, onboarded, and mentored engineers, and authored the coding standards used by all 15 peers.

• Served as the top code reviewer among senior developers, reviewing designs and code daily, raising the engineering bar, and coaching peers through defect investigation in verification testing.

• Led a cross-team pump-emulator initiative that cut developer environment setup from one week to one hour, and introduced GitHub Copilot in Android Studio with leadership approval. Senior Android Developer Abbott Laboratories Apr 2022 – Jan 2024 Remote, United States

• Led the design, architecture, and development of a Wear OS application and its companion-app integration for a continuous glucose monitoring product, guiding a dedicated Android team through testing and release.

• Built phone-to-watch data exchange over Bluetooth, a reusable standalone Jetpack Compose graphing module, and dynamic complications surfacing live glucose readings; integrated the wearable experience into a large-scale production health app.

• Developed an internal Kotlin, Compose, and Flow test harness for analyte-sensor BLE and NFC libraries, validating behavior against physical test hardware on a bio-wearable product.

• Authored a technical spike for a new wearable capability that the product team carried to executive review, and earned Certified ScrumMaster certification.

Android Developer CVS Health Mar 2018 – Mar 2022 Scottsdale, Arizona, United States

• Shipped the COVID-19 vaccine scheduling flow in the consumer CVS Health Android app, which processed more than 180,000 registrations in its first week of release.

• Delivered Kotlin features across Pharmacy, Deals & Rewards, and Photo Center, owning the drug product page and prescription savings features and the Android architecture for a major Deals & Rewards redesign.

• Interviewed and onboarded Android engineers, monitored release health and product quality, triaged production defects, and drove cross-platform consistency with the iOS team in a SAFe Agile environment. Android Developer Charles Schwab Mar 2017 – Feb 2018 Austin, Texas, United States

• Developed Java features for notifications, secure messaging, travel settings, and document access in the Charles Schwab Android app, partnering with middleware engineers on API design. Software Development Engineer in Test Microsoft Sep 2014 – Aug 2016 Redmond, Washington, United States

• Validated Spain-Spanish and Mexico-Spanish localization for Cortana across Windows and Android, performing black-box and regression testing and managing defect tracking. PROJECTS

Pulsar Android app, live on Google Play github.com/QuasarApps/Pulsar. Kotlin, Jetpack Compose, Jetpack Glance, DataStore, WorkManager. Milestone tracking app with configurable home-screen widgets, a three-tier background refresh strategy, DST-aware time calculations, TalkBack accessibility, and a zero-permission offline-only model. My CSA App Fullstack SaaS platform, live at mycsa.app. React, Tailwind, FastAPI, MongoDB. Multi-tenant farm- share management platform covering member subscriptions, inventory and lot traceability, and four-language localization, delivered by directing AI coding agents; in on-site testing with its first client. Aquifer Open-source Kotlin caching library, Apache 2.0. Kotlin, Coroutines, SQLDelight. Offline-first data layer. LEADERSHIP

Alternate Board Member, Technology Advisor Brilladora El Diamante (Remote) Mar 2024 – Present College Student Mentor (Volunteer, two mentees) STEM Advantage Aug 2025 – Present Communications Chair, Employee Resource Groups Tandem Diabetes Care Jan 2025 – Mar 2026 EDUCATION

Bachelor of Science in Computer Science Florida State University, Tallahassee, FL

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