Open to opportunities

Juan Carlos Peñalver

@juancarlospealver

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Senior Android engineer specializing in mobile apps, SDKs, and mentoring across complex Android ecosystems.

Spain

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What I'm looking for

I seek roles where I can lead and mentor teams, build robust Android apps or SDKs, drive technical design, and work in collaborative, CI-driven environments.

I am a senior Android software engineer with extensive experience building mobile applications, SDKs, and cross-platform video players for high-scale consumer apps. I have worked across teams at TomTom, Comcast, and Amazon, contributing to apps with millions of downloads and enterprise SDKs.

I write clean, maintainable code across Kotlin, Java, and modern Android toolkits, and I design implementation-friendly SDK entry points and video playback solutions using ExoPlayer and MPEG-DASH. I have strong backend and web experience with Ruby on Rails and Angular.

I mentor and lead teams as a Scrum Master and technical mentor, advocating Jetpack Compose best practices, reactive programming (Flows, Coroutines, RxJava), and CI-driven development with Jenkins and CircleCI. I have launched apps for startups and scaled products at large companies.

I am bilingual in Spanish and English, focused on pragmatic, testable solutions, and motivated to deliver high-quality user experiences across varied device resolutions and Android versions.

Experience

Work history, roles, and key accomplishments

Current

Senior Android Engineer

Current

TomTom

Jan 2025 - Present (1 year 2 months)

Developed an open-source demo app integrating TomTom APIs and SDK modules, simplified SDK initialization, served as Scrum Master, and mentored junior engineers on Jetpack Compose and Android fundamentals.

Kotlin Jetpack Compose Android SDK SDK Integration Mentoring Scrum CI CD Git

Principal Android Engineer

Comcast

Mar 2023 - Dec 2024 (1 year 9 months)

Led development of an internal video player SDK wrapping ExoPlayer for Comcast and Sky apps, delivered partner-required features and mentored junior developers on cross-platform player design.

ExoPlayer Kotlin Android SDK Video Streaming MPEG Dash SDK Development Mentoring

Mobile Software Engineer

Amazon

Sep 2016 - Mar 2023 (6 years 6 months)

Contributed to multiple Android initiatives including Comixology→Kindle feature migrations, Key/Ring integrations, and VR Alexa demos; worked across Unity, Ruby on Rails, and Angular projects for high-download consumer apps.

Kotlin Java Unity Android SDK Ruby on Rails Angular RxJava Feature Migration

Mobile Software Engineer

Possible Mobile

Sep 2015 - Sep 2016 (1 year)

Implemented features and refactored networking layers for client Android apps, including PGA Tour scorecards and MLS app improvements using RxJava.

Android SDK RxJava Kotlin Networking Refactoring CI CD

Mobile Developer

Lonely Planet

Jan 2014 - Aug 2015 (1 year 7 months)

Developed early Lonely Planet Android apps (Make My Day, Guides), established app architecture for maintainability, implemented responsive animations across Android versions, and set up CircleCI pipelines.

Android SDK Java Kotlin CI CD CircleCi App Architecture Animation

Lead Android Developer

TouristEye

May 2011 - Dec 2013 (2 years 7 months)

Led development of the TouristEye Android app (over one million downloads), implemented offline maps functionality, fixed bugs rapidly in a startup environment, and participated in 500 Startups Batch 5.

Android SDK Java Offline Maps Performance Optimization Startup Development Git

Java Junior Developer

Bull-SiConet

Sep 2009 - May 2011 (1 year 8 months)

Maintained a web application for Mapfre, improving front-end functionality using Struts and supporting communication between stakeholders and technical teams.

Java