Senior Software Engineer

CMT is looking for a Senior Software Engineer to help build and scale our on-device ML systems within the Mobile SDK. This team owns the core C/C++ runtime that powers real-time sensor processing and machine learning across millions of mobile devices. The platform enables rapid deployment of new or updated driving behavior algorithms while maintaining strict guarantees around performance, battery usage, and correctness. 

CMT is looking for a Senior Software Engineer, Machine Learning Systems 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:

• Use independent judgment and discretion to design and implement high-performance C/C++ components for real-time sensor data processing and on-device ML execution optimized for latency, memory footprint, and battery efficiency in resource-constrained mobile environments
• Drive architectural evolution of the on-device ML runtime to support rapid algorithm iteration for over-the-air delivery 
• Evolve and optimize core runtime modules responsible for filtering, resampling, and preprocessing sensor streams 
• Translate product and algorithmic requirements into scalable, maintainable system designs
• Collaborate with Data Science and Mobile teams to integrate and validate on-device models
• Lead design and code reviews and drive high standards for performance, reliability, and maintainability
• Debug and resolve production issues related to on-device algorithm behavior
• Raise the technical bar of the team through architectural rigor and performance discipline
• Complete any additional tasks as they arise 

Qualifications:

• Bachelor’s degree or equivalent years of experience and/or certification in Computer Science, Electrical Engineering, or related field 
• 4+ years of software engineering experience 
• Strong proficiency in modern C++ (C++11 or later) 
• Experience building high-performance, cross-platform C++ libraries deployed in production mobile environments 
• Demonstrated experience optimizing systems for CPU efficiency and memory footprint
• Experience designing or maintaining real-time or streaming data systems with strict latency constraints
• Strong debugging and analytical skills 
• Experience with automated testing and performance validation

Nice to Haves:

• Experience with signal processing or time-series data 
• Familiarity with on-device ML frameworks (e.g., PyTorch, TensorFlow Lite, CoreML, ExecuTorch)
• Experience integrating C++ with Android or iOS 
• Experience building SDK components embedded in third-party mobile apps

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: $139,300 to $174,100. 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
• 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
• 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 www.cmtelematics.com and follow us on X @cmtelematics.

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 www.cmt.ai.