Principal Software Engineer

Principal Software Engineer, MobileCMT 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 needsOwn a significant component of the mobile technical stack at CMTTrain, guide, and mentor other developers on proper software development procedures and methodsParticipate in the hiring processCross team and service boundaries to solve technical and business problemsDesign and architect solutions that are maintainable, scalable, reliable and testable while keeping future business directions in mindLead code and design reviewsMay lead project groups that are focused on a specific company objective or key resultImprove company defined development and operational standards and processesProvide on-call support during business critical emergency scenarios. Support and troubleshoot production issues as needed.Complete any additional tasks as they ariseQualifications:Bachelor's degree or equivalent years of experience and/or certification in a related field7+ years of relevant professional experienceAbility to do general development tasks on Linux and MacOS; fluency in a scripting language, like Python, Ruby, with the ability to learn moreUnderstanding of Agile development methodologies (specifically SCRUM)Experience with different application architectures such as Model-View-Controller, MVVM, and VIPERExperience consuming and/or designing REST APIsExperience building, developing and delivering Android or iOS mobile applications and SDKsBasic understanding of end-to-end technical solutions including backend systemsExperience 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 conceptsExperience with Android JetPack librariesExperience with Kotlin coroutines and flowsFamiliarity with third-party Android libraries like RxJava, Dagger 2, and RetrofitFluency with the Gradle build system for AndroidSkills required for iOS focused developers:Proficient in both Swift and Objective-C with a strong understanding of concurrency conceptsExperience with iOS Frameworks and development using XCodeFamiliarity with third-party iOS librariesFluency with cocoapods or Swift Package ManagerNice 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 bonusEquity 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 leaveUnlimited Paid Time Off including vacation, sick days & public holidaysFlexible scheduling and work from home policy depending on role and responsibilitiesBase Salary RangeThe base salary range for this position is: $167,200 to $209,000. This range is specifically for Cambridge, MAAdditional Perks:Work on a mission with real impact: crashes prevented, injuries avoided, lives protected around the worldJoin an industry leader — 65 million drivers protected, powering 140+ programs across 25 countriesRecognized 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 CertifiedBe part of the team inventing the future of mobility and road safetyMove fast, own outcomes, do work that mattersHigh ownership, small teams, and direct access to leadership — no layers between your work and its impactUnlimited PTO, flexible scheduling, competitive salary, annual performance bonus, RSUs, and full benefits including medical, dental, vision, and 401k matchSummer Fridays provide team members with half days to rechargeJoin one of our employee resource groups: Black, AAPI, LGBTQIA+, Women, Book Club, and Health & WellnessComprehensive wellness, education, and employee assistance programsCommitment 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.