Principal Machine Learning Engineer

Toast

Principal Machine Learning Engineer designing ML models and backend services at Toast. Build internal tools leveraging AI to enhance sales processes for restaurants.

Posted 5/23/2026full-timeRemote • California • 🇺🇸 United StatesLead💰 $180,000 - $368,000 per yearWebsite

Tech Stack

Tools & technologies

GoJavaPython

About the role

Key responsibilities & impact

Spend the majority of your time "hands-on-keyboard," architecting and coding high-performance backend services and ML pipelines
Build and prototype new internal products from scratch that leverage LLMs and Agentic AI
Design and implement ML models that provide real-time recommendations
Develop the backend between custom quoting engine, Salesforce, and internal data lakes
Act as a domain expert to solve complex synchronization and architectural challenges
Drive engineering excellence through code reviews and automated testing
Deliver significant core capabilities that have broad impact
Anticipate shifts in product needs and build flexible backend systems
Ensure the reliability of GTM tools

Requirements

What you’ll need

Extensive experience in backend languages (Java, Go, Python)
Practical, hands-on experience deploying Machine Learning models and building with LLMs
Experience building or deeply integrating with complex enterprise software
Ability to design event-driven architectures and manage data flow
Bachelor’s or Master’s degree in Computer Science, or a related technical field

Benefits

Comp & perks

Health insurance
401(k) matching
Flexible work hours
Paid time off
Remote work options

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaGoPythonMachine LearningLLMsevent-driven architecturebackend developmentautomated testingcode reviewsdata flow management

Soft Skills

problem-solvingengineering excellenceflexibilitydomain expertiseanticipation of product needs

Certifications

Bachelor’s degree in Computer ScienceMaster’s degree in Computer Science