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About the Role

We are seeking a Principal Engineer to define the technical direction for our Android platform and elevate engineering standards. This senior individual contributor role involves owning complex architectural challenges, establishing engineering benchmarks, and driving multi-quarter technical strategies across teams and products. It's a hands-on position requiring code contribution, review, and leadership, with significant impact derived from technical judgment, domain expertise, and the ability to foster engineer and process growth.

Responsibilities

Set technical strategy and own the architecture, reliability, performance, and security of the Android platform across teams and products.
Serve as the deep technical authority in one or more critical domains (e.g., GNSS, calling, networking, connectivity, power, or system services) and act as the go-to problem solver for complex system failures.
Lead technical design end-to-end, including scoping ambiguous problems, evaluating tradeoffs, producing and reviewing design documents, and aligning teams and stakeholders.
Own AIDL interfaces and communication between Android components, and the integration of hardware drivers and services with system and product applications.
Lead resolution of complex cross-layer issues spanning hardware, system services, performance, battery, memory, networking, and applications.
Define and model the engineering process, including PRs linked to tickets, unit test coverage, dev testing, rigorous code review, and upholding standards through personal reviews.
Lead and participate in agile ceremonies (daily standup, story refinement, retrospectives) and assist in breaking down large initiatives into well-scoped, parallel workstreams.
Operate across multiple concurrent workstreams, sequencing and unblocking them while maintaining technical depth.
Mentor engineers at all levels, including onboarding new hires and developing future senior and lead engineers.
Act as the senior technical point of contact for hardware, firmware, product, design, and QA teams, facilitating communication between them.
Drive platform-wide standards, tooling, and best practices, influencing the technical roadmap beyond specific areas.
Set direction on AI-assisted development, promoting adoption for measurable improvements in quality or productivity.

Requirements

8+ years of professional software engineering experience, with 6+ years focused on Android.
4+ years acting as a technical leader or principal-level IC, setting direction and mentoring engineers across teams.
Deep, demonstrable expertise in one or more platform domains such as GPS, calling, networking, connectivity, or system services (3+ years of focused depth).
7+ years hands-on with Android SDK, Android Studio, Kotlin, and Java.
4+ years hands-on with AOSP, Android framework, system services, privileged apps, HALs, or custom Android devices.
Deep knowledge of Binder, AIDL, drivers, and hardware-to-application data flow (4+ years).
Expert understanding of Android architecture, security, performance, and UI development.
4+ years with MVVM or Clean Architecture, modularization, Dagger or Hilt, Coroutines, Flow, or RxJava.
Experience with XML Views and Jetpack Compose (3+ years).
Expert testing and debugging skills using tools such as JUnit, Robolectric, Espresso, logs, traces, and bug reports.
4+ years working with CI/CD, feature flags, analytics, staged releases, and large codebases.
A track record of setting and upholding engineering processes (PR hygiene, unit testing, dev testing, code review) across a team.
A proven history of sound architecture and tradeoff decisions under ambiguity and constraint, at a scope that affected multiple teams or products.
Excellent communication, ownership, and problem-solving skills, with a demonstrated ability to drive alignment across the org.
Deep experience with smartwatches, wearables, IoT, embedded Android, or other custom hardware (3+ years).
Experience with Linux drivers, JNI, C/C++, Soong, or the AOSP build system.
Published Android applications or open-source contributions.
Experience with design systems and global product releases.
Experience defining engineering process, tooling, or release infrastructure at the org level.
Familiarity with responsible AI-assisted development practices.

Skills

Android SDK
Android Studio
Kotlin
Java
AOSP
Android framework
System services
Privileged apps
HALs
Custom Android devices
Binder
AIDL
Drivers
Hardware-to-application data flow
Android architecture
Security
Performance
UI development
MVVM
Clean Architecture
Modularization
Dagger
Hilt
Coroutines
Flow
RxJava
XML Views
Jetpack Compose
JUnit
Robolectric
Espresso
CI/CD
Feature flags
Analytics
Staged releases
Large codebases
Technical ownership
Decision-making
Communication
Problem-solving
Smartwatches
Wearables
IoT
Embedded Android
Custom hardware
Linux drivers
JNI
C/C++
Soong
AOSP build system
Design systems
Global product releases
AI-assisted development

Location

Remote

Work Type

Remote

Experience Level

Principal Engineer
Senior Engineer

Benefits

Competitive salary
100% employer paid supplemental medical policy
Generous PTO

About the Company

COSMO inspires kids through innovative technology and a supportive community.
Family-centric products, such as the award-winning JrTrack Kids Smartwatch, enhance children's independence and confidence.
The JrTrack Kids Smartwatch functions as a phone, GPS tracker, and music player, managed via the Mission Control Parent App.
The Mission Control Parent App allows parents to set safety alerts and manage contacts.
Cosmo is recognized as a top kids' wearable by PCMag and others.
Cosmo is on the rise.