Principal Data Scientist

A Principal Data Scientist at Toast will lead the design and development of scalable ML systems for menu recommendation, demand forecasting, offer targeting, and guest personalization.

Responsibilities

Own the full machine learning lifecycle—from problem framing and data exploration to modeling, deployment, and monitoring—for mission‑critical initiatives.

Design and implement advanced ML and statistical models that improve product performance, operational efficiency, or customer insights.

Collaborate with engineers, product managers, and business stakeholders to define project scope, success metrics, and integration strategy.

Guide architectural decisions, set modeling standards, and champion best practices for experimentation, validation, and productionization.

Mentor other data scientists and raise the technical bar through design reviews, feedback, and sharing domain expertise.

Proactively identify areas where data science can create business value and lead cross‑functional efforts to drive those opportunities forward.

Requirements

10+ years of experience in data science with a proven track record of delivering production ML systems that drive measurable impact.

Deep focus on mentorship, having leveled up more junior data scientist.

You’ve been a technical leader for core data science at Toast.

Deep knowledge of statistical modeling, machine learning (tree‑based models, time series, deep learning), and model evaluation.

Experience working with real‑world product data at scale and translating ambiguous problems into well‑scoped ML solutions.

Experience with distributed data processing and training, real‑time inference, and ML Ops frameworks.

Prior experience mentoring other data scientists or acting as a tech lead.

Experience leading experimentation (A/B testing), causal inference, and real‑time decision systems.

Proficiency in Python and SQL, and experience with ML frameworks (scikit‑learn, PyTorch, Tensor Flow).

Strong grasp of software engineering principles including modular design, version control, testing, and CI/CD.

Hands‑on experience with cloud platforms (preferably AWS), including tools like Sage Maker, Athena, Glue, Dynamo

DB, and Bedrock.

Excellent communication skills and the ability to influence both technical and non‑technical stakeholders.

Strong business acumen with the ability to align technical solutions with company goals.

Salary
Pay Range: $143,000—$229,000 CAD

Legal and EEO statements
Toast is committed to creating an accessible and inclusive hiring process. As part of this commitment, we strive to provide reasonable accommodations for persons with disabilities to enable them to access the hiring process. If you need an accommodation to access the job application or interview process, please contact candida

For roles in the United States, It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

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