Senior Software Engineer, Full Stack

As a Senior Fullstack Software Engineer at CMT, you’ll design, build, and maintain scalable web applications that power our telematics platform. You’ll work across the tech stack—from intuitive user interfaces to robust backend systems—solving complex problems in collaboration with product, design, and data teams. This is a hands-on engineering role for someone who thrives in a fast-paced environment, mentors others, and brings a strong sense of ownership and curiosity. Your work will directly impact how users experience CMT’s products and contribute to our mission of making roads safer around the world.

CMT is looking for a Senior Software Engineer, 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:

Solve complex problems and transform them into business solutions in collaboration with team members

Analyze and translate business and functional specifications and change requests into technical specifications suitable for implementation

Able to independently transform complex technical requirements into smaller implementable pieces; able to implement performant software solutions that are maintainable, scalable, reliable and testable

Participate in code and design reviews

Participate in the hiring process

Train and guide junior developers on proper software development procedures and methods

Follow 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 technical field

4+ years of relevant experience

Experience developing web applications and proficiency in web technologies (HTML, CSS, JavaScript, TypeScript).

Experience with web frameworks like React and Django is a plus.

Experience designing or developing Restful APIs or web services

Knowledge of a backend development language like Python

Comfortable working with AWS services: EC2, S3, Lambda, SNS, SQS, RDS (Postgres), NoSQL

Understanding of Agile development methodologies (specifically SCRUM)

Excellent communication and collaboration skills

Customer obsessed, demonstrates initiative, has a learning mindset, takes ownership

Proven ability to deliver results

An analytical mindset

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

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 Cambrid…