Principal Software Engineer, Full Stack (, MA, United States)

Principal Software Engineer, Full Stack

Join Cambridge Mobile Telematics (CMT), the world’s largest telematics service provider. Its mission is to make the world’s roads and drivers safer. CMT’s AI‑driven platform, DriveWell Fusion®, gathers sensor data from millions of IoT devices—including smartphones, proprietary tags, connected vehicles, dashcams, and third‑party devices—and fuses them with contextual data to create a unified view of vehicle and driver behavior.

CMT measures and protects tens of millions of drivers across the world every day. We are seeking an experienced Principal Software Engineer to lead complex projects and mentor teams in building scalable and reliable full‑stack solutions.

Responsibilities

• Lead the development of critical features and components, ensuring high quality and timely delivery
• Provide technical guidance and mentorship to engineering teams, fostering a culture of excellence
• Identify and resolve complex technical challenges, proactively mitigating risks
• Lead cross‑functional technical projects
• Evaluate and recommend new technologies and approaches to improve system performance and efficiency
• Design and implement robust, scalable, and maintainable architectures for complex systems
• Collaborate with product and engineering leaders to define technical roadmaps and strategies
• Anticipate future technical needs and ensure the platform is prepared for growth
• Contribute to the development of best practices and standards for software development
• Ensure the reliability and performance of production systems, providing on‑call support as needed
• Drive continuous improvement initiatives to enhance operational efficiency
• Troubleshoot and resolve complex production issues, minimizing downtime
• Follow company–defined development and operational standards and processes
• Mentor and guide senior and junior engineers, fostering their technical growth
• Lead code and design reviews, ensuring adherence to best practices
• Collaborate effectively with cross‑functional teams, including product, QA, and operations
• Participate heavily in the hiring process, and improve the hiring process
• Complete any additional tasks as they arise

Qualifications

• Bachelor’s degree or equivalent years of experience and/or certification in a technical field
• 7+ years of relevant professional experience
• Deep 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 services
• Strong 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 DevOps
• Understanding of Agile development methodologies (specifically Scrum)
• Excellent communication and collaboration skills
• Customer–obsessed, demonstrates initiative, has a learning mindset, takes ownership
• Demonstrated ability to drive technical initiatives and influence architectural decisions
• Strong experience with system design

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 and 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

• Feel great working to improve road safety around the world
• Join one of our many employee resource groups including Black, AAPI, LGBTQIA+, Women, Book Club and Health & Wellness
• Extensive wellness, education and employee assistance programs
• CMT will do all that is possible to support our employees and create a positive and inclusive work environment for all.

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 X @cmtelematics.