Your work days are brighter here.

We’re obsessed with making hard work pay off, for our people, our customers, and the world around us. As a Fortune 500 company and a leading AI platform for managing people, money, and agents, we’re shaping the future of work so teams can reach their potential and focus on what matters most. The minute you join, you’ll feel it. Not just in the products we build, but in how we show up for each other. Our culture is rooted in integrity, empathy, and shared enthusiasm. We’re in this together, tackling big challenges with bold ideas and genuine care. We look for curious minds and courageous collaborators who bring sun-drenched optimism and drive. Whether you're building smarter solutions, supporting customers, or creating a space where everyone belongs, you’ll do meaningful work with Workmates who’ve got your back. In return, we’ll give you the trust to take risks, the tools to grow, the skills to develop and the support of a company invested in you for the long haul. So, if you want to inspire a brighter work day for everyone, including yourself, you’ve found a match in Workday, and we hope to be a match for you too.

About the Team

Do you want to build AI-powered software that impacts millions of people every day? The AI Core team, part of Workday’s AI Platform organization, tackles challenging problems at the intersection of machine learning, agentic reasoning, and enterprise-scale systems. Our work delivers critical AI platform capabilities and differentiated, deep-value agent applications.

About the Role

As a Senior Machine Learning Engineer on the AI Core team, you will be primarily responsible for designing, building, and applying machine learning models and agentic systems that power AI-driven applications at Workday. Specifically, you will:

• Lead the design, development, and deployment of novel agentic systems and core machine learning models that power AI-driven capabilities.

• Execute data analysis, error analysis, and rigorous experimentation to drive model improvements and new capability development.

• Design and implement the end-to-end machine learning pipeline (MLOps), ensuring model scalability, reliability, and consumption via robust APIs.

• Work with large-scale datasets to perform data wrangling, feature engineering, and validation to train and fine-tune state-of-the-art models.

• Apply machine learning and distributed systems principles in production to address model scalability, concurrency, fault tolerance, and performance challenges.

• Own ML models and systems through their full lifecycle, including deployment, monitoring, debugging, and ongoing operational improvements.

About You

You are a strong technical leader with deep expertise in machine learning, agentic systems, and Python, capable of writing production-grade code while delivering solutions efficiently.

Basic Qualification:

• 8+ years of professional Machine Learning / AI engineering experience, including designing, building, and scaling production ML models and systems.

• 5+ years of experience with advanced Python development.

• Bachelor’s degree in Computer Science, Machine Learning, or related discipline, or equivalent practical experience.

Technical Skills:

• Expertise in designing, training, and evaluating Machine Learning models (e.g., LLMs, deep learning models, classical ML) and deploying them to production environments.

• Expertise with building agentic systems and leveraging LLMs, retrieval-augmented generation (RAG), and sophisticated prompting techniques.

• Proficiency with popular Machine Learning frameworks (e.g., Py Torch, Tensor Flow, Scikit-learn) and MLOps tools.

• Strong understanding of data wrangling, feature engineering, and data validation techniques for large-scale datasets.

• Proficiency with advanced Python concepts, such as asynchronous and concurrent programming, generators, higher-order abstractions, and applying object-oriented design principles.

• Proficiency with unix systems and cloud platforms, including containerized workloads and orchestration systems (e.g., AWS or GCP, Docker, Kubernetes).

Leadership and Communication Skills:

• Ability to collaborate effectively across teams, working closely with other engineers while maintaining independent execution.

• Ownership mindset, able to take responsibility for a work area and deliver high-quality, reliable systems.

• Ability to mentor and coach other engineers, promoting best practices and raising the engineering bar.

• Architectural thinking skills, with the ability to contribute meaningful ideas and practical solutions in design and architecture discussions.

• Ability to communicate complex technical concepts clearly to both technical and non-technical stakeholders.

Workday Pay Transparency Statement

The annualized base salary ranges for the primary location and any additional locations are listed below. Workday pay ranges vary based on work location. As a part of the total compensation package, this role may be eligible for the Workday Bonus Plan or a role-specific commission/bonus, as well as annual refresh stock grants. Recruiters can share more detail during the hiring process. Each candidate’s compensation offer will be based on multiple factors including, but not limited to, geography, experience, skills, job duties, and business need, among other things. For more information regarding Workday’s comprehensive benefits, please click here.

Primary Location: CAN.ON.Toronto

Primary CAN Base Pay Range: $156,000 - $234,000 CAD

Additional CAN Location(s) Base Pay Range: $156,000 - $234,000 CAD

Our Approach to Flexible Work

With Flex Work, we’re combining the best of both worlds: in-person time and remote. Our approach enables our teams to deepen connections, maintain a strong community, and do their best work. We know that flexibility can take shape in many ways, so rather than a number of required days in-office each week, we simply spend at least half (50%) of our time each quarter in the office or in the field with our customers, prospects, and partners (depending on role). This means you'll have the freedom to create a flexible schedule that caters to your business, team, and personal needs, while being intentional to make the most of time spent together. Those in our remote "home office" roles also have the opportunity to come together in our offices for important moments that matter.

Pursuant to applicable Fair Chance law, Workday will consider for employment qualified applicants with arrest and conviction records.

Workday is an Equal Opportunity Employer including individuals with disabilities and protected veterans.

At Workday, we are committed to providing an accessible and inclusive hiring experience where all candidates can fully demonstrate their skills. If you require assistance or an accommodation at any point, please email accommodations@workday.com.

Are you being referred to one of our roles? If so, ask your connection at Workday about our Employee Referral process!

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