Principal Software Development Engineer

WillHire

Principal Software Development Engineer on AI Model Serving team at Workday. Leading technical direction and design decisions for large-scale distributed systems and machine learning deployment.

Posted 6/23/2026full-timeToronto • 🇨🇦 CanadaLead💰 CA$168,000 - CA$252,000 per yearWebsite

Tech Stack

Tools & technologies

Distributed SystemsPrometheusPythonRay

About the role

Key responsibilities & impact

Help set the product vision for the AI Model Serving platform in partnership with the engineering manager.
Lead the team technically by making critical design decisions that drive performance, reliability, and scalability across the platform.
Design, implement, and maintain large-scale systems that enable moving ML models to production.
Write design documents to build consensus for new system components and enhancements to existing components.
Evaluate and uptake new technologies made available within Workday and across the broader industry.
Troubleshoot, improve, and scale continuous integration software pipelines.
Develop relationships with software engineers, machine learning engineers, and data scientists on partner teams.
Respond to alerts and debug production issues to maintain platform health and reliability.
Review pull requests and enforce consistency, performance, readability, and security across code bases.
Develop documentation to share knowledge with other engineers.

Requirements

What you’ll need

8+ years of related work experience in software development, with a focus on building and operating large-scale distributed systems.
Bachelor's degree in Computer Science, Engineering, or a related technical field (or equivalent practical experience).
Deep experience designing, building, and scaling production-grade distributed systems.
Understand the full software development lifecycle — from coding standards and testing to code reviews, source control management, and deployment.
Bring a product-oriented perspective to platform engineering.
Deep proficiency in Python, with extensive experience writing production-level code and building systems in Python-based frameworks.
Familiarity with both large language models and traditional machine learning models.
Experience with Ray and Ray Serve for distributed model serving at scale.
Experience with Prometheus for monitoring and observability of distributed systems.
Excellent written and verbal communication skills.
Collaborative approach to engineering, with experience mentoring other engineers and fostering an inclusive team environment.

Benefits

Comp & perks

Workday Bonus Plan or role-specific commission/bonus
Annual refresh stock grants

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Pythonlarge-scale distributed systemsproduction-grade systemscontinuous integrationdesign documentscode reviewssource control managementmonitoringobservabilitymachine learning models

Soft Skills

communicationcollaborationmentoringteam environmentproduct-oriented perspective

Certifications

Bachelor's degree in Computer ScienceBachelor's degree in Engineering