Principal Software Engineer, Full StackWe are seeking an experienced Principal Software Engineer to lead complex projects, and mentor teams in building scalable and reliable full-stack solutions. The person in this role will play a pivotal role in shaping the technical direction of our platform and ensuring its continued success.CMT is looking for a Principal Software Engineer I, Full Stack 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.Responsibilities:Lead the development of critical features and components, ensuring high quality and timely deliveryProvide technical guidance and mentorship to engineering teams, fostering a culture of excellenceIdentify and resolve complex technical challenges, proactively mitigating risks.Lead cross functional technical projectsEvaluate and recommend new technologies and approaches to improve system performance and efficiencyDesign and implement robust, scalable, and maintainable architectures for complex systemsCollaborate with product and engineering leaders to define technical roadmaps and strategiesAnticipate future technical needs and ensure the platform is prepared for growthContribute to the development of best practices and standards for software developmentEnsure the reliability and performance of production systems, providing on-call support as neededDrive continuous improvement initiatives to enhance operational efficiencyTroubleshoot and resolve complex production issues, minimizing downtimeFollow company defined development and operational standards and processesMentor and guide senior and junior engineers, fostering their technical growthLead code and design reviews, ensuring adherence to best practicesCollaborate effectively with cross-functional teams, including product, QA, and operationsParticipate heavily in the hiring process, and improve the hiring processComplete any additional tasks as they ariseQualifications:Bachelor's degree or equivalent years of experience and/or certification in a technical field7+ years of relevant professional experienceDeep expertise in web technologies (HTML, CSS, JavaScript, TypeScript) and modern web frameworks (e.g., React, Django)Extensive experience designing or developing Restful APIs or web servicesStrong proficiency in a backend development language (e.g. Python, Java)Expertise in cloud platforms (e.g., AWS), including services like EC2, S3, Lambda, SNS, SQS, RDS (Postgres), and NoSQL databases.Proven ability to design and implement scalable and resilient systems.Strong understanding of software development best practices, including testing, CI/CD, and DevOpsUnderstanding of Agile development methodologies (specifically Scrum)Excellent communication and collaboration skillsCustomer obsessed, demonstrates initiative, has a learning mindset, takes ownershipDemonstrated ability to drive technical initiatives and influence architectural decisions.Strong experience with system designCompensation 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 Range:The 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. To learn more, visit and follow us on Instagram @cmt.aiAbout 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