Principal Software Engineer, Mobile

Cambridge Mobile Telematics; Cambridge (MA); On-site; USD 167,000 - 209,000; Full time

Benefits offered by this job

Equity RSUs

Medical, Dental, Vision Insurance

401k match

Unlimited PTO

Work from home policy

Flexible scheduling

Job summary

Cambridge Mobile Telematics (CMT) is seeking a Principal Android Engineer to lead architecture for our Android SDK and own key mobile stack components. This principal-level IC role emphasizes deep technical ownership, cross-functional leadership, and setting architectural direction for our platform.

You will mentor developers, participate in hiring, and drive scalable, testable solutions while collaborating with product managers and engineering teams.

Qualifications

• Bachelor's degree or equivalent years of experience.
• 7+ years of relevant professional experience.
• Proficiency in Java and Kotlin with concurrency concepts.
• Experience with Android architectures such as MVC, MVVM, VIPER.
• Experience delivering Android apps and SDKs.
• Experience consuming and/or designing REST APIs.
• CI/CD and test-driven development (TDD) knowledge.

Responsibilities

• Partner with product managers to understand business directions and collaborate with stakeholders to develop project plans.
• Own a significant component of the mobile technical stack at CMT.
• Train, guide, and mentor other developers on development procedures and methods.
• Participate in the hiring process.
• Design and architect maintainable, scalable, reliable, and testable solutions.

Skills

Java

Kotlin

Android SDK

Android architecture

REST APIs

CI/CD

SCRUM/Agile

Education

Bachelor's degree or equivalent years of experience

Tools

Android Studio

Gradle

Retrofit

Dagger 2

RxJava

Kotlin Coroutines

Job description

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 for Social Good. CMT is also Great Place to Work Certified
• Be part of the team inventing the future of mobility and road safety
• Move fast, own outcomes, do work that matters
• High ownership, small teams, and direct access to leadership - no layers between your work and its impact
• Unlimited PTO, flexible scheduling, competitive salary, annual performance bonus, RSUs, and full benefits including medical, dental, vision, and 401k match
• Summer Fridays provide team members with half days to recharge
• Join one of our employee resource groups: Black, AAPI, LGBTQIA+, Women, Book Club, and Health & Wellness
• Comprehensive wellness, education, and employee assistance programs

Commitment To Diversity And Inclusion

At CMT, we believe the best ideas come from a mix of backgrounds and perspectives.

We are an equal-opportunity employer committed to creating a workplace and culture where everyone feels valued, respected, and empowered to bring their unique talents and perspectives.

Diversity is essential to our success, and we actively seek candidates from all backgrounds to join our growing team.

We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status or disability state.

CMT is headquartered in Cambridge, MA.

To learn more, visit and follow us on Instagram @cmt.ai

About Cambridge Mobile Telematics

Cambridge Mobile Telematics (CMT) is the world's largest telematics and AI company for safer mobility. Its mission is to make the world's roads and drivers safer. The company's AI-driven platform, DriveWell Fusion, proactively identifies and reduces driving risk, leading to fewer crashes and injuries. To date, CMT's technology has helped prevent over 126,000 crashes worldwide. CMT enables partners to measure risk, detect crashes, provide life-saving assistance, and streamline claims. Headquartered in Cambridge, MA, CMT operates globally with offices in Budapest, Hungary; Chennai, India; Seattle, Washington; Tokyo, Japan; and Zagreb, Croatia. Learn more at