Principal Software Engineer, Mobile

CMT is looking for a Principal Android Engineer to help us change the world. CMT has helped protect over 65 million drivers and prevent over 126,000 crashes worldwide. We build AI to solve some of the most difficult challenges in mobility — understanding and reducing risk, detecting crashes, and getting people life-saving help. The problems are hard. The impact is real. No matter your role, your work will matter at CMT. This is a principal-level individual contributor role on the Android SDK team, focused on deep technical ownership, cross-functional tech leadership, and driving the architectural direction of CMT's Android SDK platform.

Responsibilities:

Partner with product managers to understand business directions and collaborate with product managers, technical leads and other stakeholders to develop project plans that meet business needs

Own a significant component of the mobile technical stack at CMT

Train, guide, and mentor other developers on proper software development procedures and methods

Participate in the hiring process

Cross team and service boundaries to solve technical and business problems

Design and architect solutions that are maintainable, scalable, reliable and testable while keeping future business directions in mind

Lead code and design reviews

May lead project groups that are focused on a specific company objective or key result

Improve company defined development and operational standards and processes

Provide on-call support during business critical emergency scenarios. Support and troubleshoot production issues as needed.

Complete any additional tasks as they arise

Qualifications:

Bachelor’s degree or equivalent years of experience and/or certification in a related field

7+ years of relevant professional experience

Ability to do general development tasks on Linux and MacOS; fluency in a scripting language, like Python, Ruby, with the ability to learn more

Understanding of Agile development methodologies (specifically SCRUM)

Experience with different application architectures such as Model-View-Controller, MVVM, and VIPER

Experience consuming and/or designing REST APIs

Experience building, developing and delivering Android or iOS mobile applications and SDKs

Basic understanding of end-to-end technical solutions including backend systems

Experience with continuous deployment, and test-driven development (TDD)

Skills required for Android developers:

Proficient in both Java and Kotlin with a strong understanding of concurrency concepts

Experience with Android JetPack libraries

Experience with Kotlin coroutines and flows

Familiarity with third-party Android libraries like RxJava, Dagger 2, and Retrofit

Fluency with the Gradle build system for Android

Skills required for iOS focused developers:

Proficient in both Swift and Objective-C with a strong understanding of concurrency concepts

Experience with iOS Frameworks and development using XCode

Familiarity with third-party iOS libraries

Fluency with cocoapods or Swift Package Manager

Nice to Haves:

Actively uses AI coding tools in development work, can critically evaluate AI-generated code for logical errors, edge cases, and security or reliability risks, and can explain and take full ownership of any code incorporated into their work.

Previous experience developing and maintaining SDKs or mobile platforms consumed by external developers, including managing API versioning, backward compatibility, and developer ergonomics.

Experience with mobile observability practices, including custom logging pipelines, crash reporting, and metrics collection with low overhead on devices.

Experience with background processing and battery optimization on Android, including managing OS-level restrictions such as Doze mode, App Standby, and foreground service requirements.

Demonstrated history of technical leadership without authority, including driving architectural decisions, mentoring peers, and influencing engineering direction across teams.

Compensation and Benefits:

Fair and competitive salary based on skills and experience, and annual performance bonus

Equity may be awarded in the form of Restricted Stock Units (RSUs)

Medical, Dental, Vision and Life Insurance, matching 401k, short-term long-term disability and parental leave

Unlimited Paid Time Off including vacation, sick days public holidays

Flexible scheduling and work from home policy depending on role and responsibilities

Base Salary Range

The base salary range for this position is: $167,200 to $209,000. This range is specifically for Cambridge, MA

Additional Perks:

Work on a mission with real impact: crashes prevented, injuries avoided, lives protected around the world

Join an industry leader — 65 million drivers protected, powering 140+ programs across 25 countries

Recognized innovator in mobility AI, earning top honors including the TIME Industry Leader in AI, a Gold Edison Award, and the Artificial Intelligence Excellence Award for AI fo…