Jobs for data annotations at Toronto

**Principal Python Engineer — ML Infrastructure (AI Training)** **About The Role** What if your Python expertise could directly shape the infrastructure that powers the most advanced AI systems in the world? We're looking for a Principal Python Engineer in Toronto to design and build the data pipelines, annotation tooling, and evaluation systems that...

**Computer Vision & ML Expert (AI Training)** **About The Role** What if your expertise in computer vision could directly shape how the next generation of AI systems perceives, interprets, and understands the visual world? We're looking for Computer Vision & Machine Learning Experts in the Toronto area and across Canada to evaluate, improve, and guide AI...

**About The Role** What if your deep knowledge of formal mathematics could directly shape how the most advanced AI systems in the world reason, prove, and think? We're looking for mathematicians with a passion for rigorous proof and formal systems to help build the mathematical foundations that frontier AI depends on. This is a fully remote, flexible...

**About The Role** What if your deep expertise in TypeScript could directly influence how AI writes code for millions of developers around the world? We're looking for experienced Frontend TypeScript Engineers in Toronto and across Canada to review, evaluate, and guide AI-generated code — helping cutting-edge AI models understand what truly type-safe,...

**Mechanical Engineering — AI Trainer** **About The Role** We're partnering with the world's leading AI research labs to build smarter, more technically rigorous AI models — and we need mechanical engineers to make it happen. If you have deep knowledge of fluid dynamics, thermodynamics, structural mechanics, or mechatronics, this is your opportunity to...

**About Rex.zone** Rex.zone is hiring Toronto-based candidates for full-time remote data annotation and data labeling work that improves training data quality for AI/ML systems. You will support real-world LLM training pipelines through evaluation, QA, and careful rubric-driven judgments. **About The Role** As a Remote Data Annotator, you will create...

Rex.zone is hiring senior contributors to lead AI data annotation and QA evaluation workstreams that improve training data quality for modern AI/ML systems. This is a **remote** , **full-time** role aligned to real-world LLM training pipelines across NLP, computer vision, and content safety domains. **About The Role** You will translate product and...

About the roleAs our Technical Content Writer, you will be the strategic architect and hands-on creator for our most viewed self-serve help channel, the Help Desk. You are not just a writer—you will completely own, organize, and scale our customer-facing Help Center/Knowledge Base.You will bridge the gap between complex platform mechanics and clear,...

French (Canada) Linguistic Projects (Remote)Join Sigma. AI – Shaping the Future of Artificial IntelligenceWhat is Sigma? Sigma is a leading global technology company specializing in data collection and annotation for Artificial Intelligence. With over 30 years of experience, offices in Spain, the US, and the UK, and operations in more than 200 languages,...

Mercor is on the lookout for experienced Musicians to evaluate AI-generated music, collaborating with a cutting-edge AI lab. This part-time role entails assessing musical outputs in both French and English.As a Music Producer, you will utilize your knowledge of music production to evaluate lyrics, vocal quality, and the overall creativity of AI models. A...

In this hourly, remote contractor role, you will review AI-generated English-language responses and/or generate expert language content, evaluating reasoning quality and step-by-step edits while providing precise, actionable feedback. You will assess solutions for accuracy, clarity, and adherence to the prompt; identify errors in logic, meaning, methodology,...

**Who are we?** Cohere is the leading security-first enterprise AI company. We build cutting-edge foundation AI models and end-to-end products that are designed to solve real-world business problems. We’re training and deploying frontier models for enterprises who are building AI systems. We believe that our work is instrumental to the widespread...

At eBay, we're more than a global ecommerce leader — we’re changing the way the world shops and sells. Our platform empowers millions of buyers and sellers in more than 190 markets around the world. We’re committed to pushing boundaries and leaving our mark as we reinvent the future of ecommerce for enthusiasts.Our customers are our compass,...

UHN is Canada’s #1 hospital and the world’s #1 publicly funded hospital. With 10 sites and more than 44,000 TeamUHN members, UHN consists of Toronto General Hospital, Toronto Western Hospital, Princess Margaret Cancer Centre, Toronto Rehabilitation Institute, The Michener Institute of Education and West Park Healthcare Centre. As Canada's top research...

UHN is Canada’s #1 hospital and the world’s #1 publicly funded hospital. With 10 sites and more than 44,000 TeamUHN members, UHN consists of Toronto General Hospital, Toronto Western Hospital, Princess Margaret Cancer Centre, Toronto Rehabilitation Institute, The Michener Institute of Education and West Park Healthcare Centre. As Canada's top research...

Company DescriptionThe Klick Group—comprising Klick Health (including Klick Katalyst and btwelve), Klick Media Group, Klick Applied Sciences (including Klick Labs), Klick Consulting, and Klick Ventures—is an ecosystem dedicated to realizing the full potential of our people and clients in life sciences. Founded in 1997, we have offices in New York,...

Job Requisition ID #26WD98722Position OverviewAutodesk's domains — architecture, engineering, construction, manufacturing, media & entertainment — provide a distinctive research environment: rich structured data, long-horizon reasoning tasks, and real-world evaluation grounded in professional workflows. Uniquely, decades of investment in physics...

Job Requisition ID #26WD9829726WD98297, Research Lead / Principal Scientist & Manager Post-Training · Alignment · Reinforcement Learning Autodesk AI Lab: Toronto · RemoteFrench translation to follow!/Traduction française à suivre! About Autodesk AI LabAutodesk AI Lab advances state-of-the-art research across generative AI, multimodal foundation models,...

Come Build Your Career at Aecon!   Aecon delivers some of the most complex and impactful infrastructure projects — from transformative transportation networks to critical energy, industrial and nuclear programs. The projects we build connect communities and power future generations. With deep roots in North America and a strong footprint internationally,...

**About The Role** This role sits within the applied science function. You will own the design, development, and production deployment of document understanding systems that directly power Westlaw, PracticalLaw, and CoCounsel. The problems are real, the scale is large, and the expectation is shipped, reliable, measurable impact. You will work across...