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Added 3 months ago
L
Data Scientist
Larus
Ottawa, Ontario
- Full-time
…various data science problems, while communicating directly with enterprise clients to gather requirements, define problems, and develop applied…
Added 3 months ago
SG
Lead Penetration Test Engineer
S&P Global
Toronto, Ontario
- $135,000 to $180,000 CAD / year
- Full-time
…complex security challenges. We are passionate problem solvers with deep security…
Added 3 months ago
IE
Principal Machine Learning Architect
Index Exchange
Toronto, Ontario
- Full-time
Experience with Python or other relevant programming languages and Machine Learning frameworks
Added 1 month ago
Physical Design Methodology Engineer, AI HW IP
Tenstorrent
Toronto, ON
Expertise with industry-standard tools (FusionCompiler/ICC2, Innovus/Genus, PrimeTime, RedHawk) and scripting languages (Tcl, Python, Perl).
Added 3 months ago
B
Forward Deployed Engineer
Baseten
Montreal, Quebec
- $165,000 to $330,000 USD / year
- Full-time
…general-purpose programming languages in a production-level environment, with a preference for Python due to its relevance in ML…
Added 3 months ago
B
Product Engineer - Dedicated Inference
Baseten
Montreal, Quebec
- $165,000 to $330,000 USD / year
- Full-time
…applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing…
Added 3 months ago
B
Software Engineer - Infrastructure
Baseten
Montreal, Quebec
- $165,000 to $330,000 USD / year
- Full-time
…applied AI research, flexible infrastructure, and seamless developer tooling, we enable companies operating at the frontier of AI to bring cutting-edge models into production. We're growing…
Added 3 months ago
B
Software Engineer - GPU Networking & Distributed Systems
Baseten
Montreal, Quebec
- $165,000 to $330,000 USD / year
- Full-time
You are fluent in C++ or Python, with the ability to bridge the gap between high-level logic and hardware. You have a deep understanding of the memory hierarchy in modern NVIDIA…
Added 3 months ago
M
Applied AI, Technical Lead, Forward Deployed AI Engineer
Mistral
Montreal, Quebec
- Full-time
Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems - across high-stakes…
Added 3 months ago
O
Senior Machine Learning Engineer in Medical Imaging
Oncoustics
Toronto, Ontario
- Full-time
…institutional investors and have deep partnerships in place with several major ultrasound and pharmaceutical players. We are looking to hire a senior ML Engineer to join our team with…
Added 3 months ago
O
Senior DevOps Engineer, for AI-based Systems
Oncoustics
Toronto, Ontario
- Full-time
Familiarity with Python for machine learning and deep learning
Added 3 months ago
O
Data Scientist/Machine Learning Scientist in Medical Imaging
Oncoustics
Toronto, Ontario
- Full-time
…institutional investors and have deep partnerships in place with several major ultrasound and pharmaceutical players. We are looking to hire an experienced ML Engineer/Data Scientist to…
Added 2 months ago
TA
Lead AI Engineer
Tiger Analytics Inc.
Remote, Canada
- Remote
…distributed systems, cloud-native architectures, and MLOps with exceptional stakeholder management skills. This individual will oversee multiple engineering pods, mentor technical teams,…
Added 2 months ago
HT
Embedded Engineer – AI System Architecture
Huawei Technologies Canada Co., Ltd.
Edmonton, AB
- Contract
Research and development of Agentic AI Software for system optimization on edge devices, with measurable wins in latency, power, and quality.
Added 2 months ago
T
Data Engineer
Thales
Ottawa, ON
- Full-time
Experience with scripting technologies such as Python, R
Added 3 months ago
E
Senior Machine Learning Engineer
EvenUp
Toronto, Ontario
- $196,000 to $265,000 USD / year
- Full-time
…SignalFire, and Lightspeed. We are looking to expand our team with talented, driven, and collaborative individuals who seek to have a lasting impact. Learn more at…
Added 3 months ago
E
Staff Machine Learning Engineer
EvenUp
Toronto, Ontario
- $212,000 to $301,000 USD / year
- Full-time
…SignalFire, and Lightspeed. We are looking to expand our team with talented, driven, and collaborative individuals who seek to have a lasting impact. Learn more at…
Added 3 months ago
K
Software Engineer II, AI
Klue
Toronto, Ontario
- $115,000 to $149,000 CAD / year
- Full-time
Expertise in Python, with experience in frameworks such as PyTorch, TensorFlow, or JAX.
Added 4 months ago
KS
Full Stack Developer
Kumaran Systems
Toronto, ON
- Full-time
Seeking a talented and motivated Full Stack Developer to join our technology team. The ideal candidate will be responsible for designing, developing, and maintaining scalable web…
Added 3 months ago
I
Senior Data Engineer
iQmetrix
Regina, Saskatchewan
- Full-time
The ideal candidate is a hands-on engineer with strong production experience in Python, SQL, and distributed compute environments. They should have deep familiarity with modern lakehouse…
Added 3 months ago
S
AI Platform Engineer – DevOps
Synechron
Halifax, Nova Scotia
- $85,000 to $100,000 CAD / year
- Full-time
Champion developer-experience and best practices in conjunction with DevOps to ensure no developer is left behind
Added 3 months ago
I
Senior Data Engineer
iQmetrix
Winnipeg, Manitoba
- Full-time
The ideal candidate is a hands-on engineer with strong production experience in Python, SQL, and distributed compute environments. They should have deep familiarity with modern lakehouse…
Added 3 months ago
I
Senior Data Engineer
iQmetrix
Vancouver, British Columbia
- Full-time
The ideal candidate is a hands-on engineer with strong production experience in Python, SQL, and distributed compute environments. They should have deep familiarity with modern lakehouse…
Added 3 months ago
I
Senior Data Engineer
iQmetrix
Toronto, Ontario
- Full-time
The ideal candidate is a hands-on engineer with strong production experience in Python, SQL, and distributed compute environments. They should have deep familiarity with modern lakehouse…
Added 3 months ago
KS
Full Stack Developer
Kumaran Systems
Toronto, Ontario
- Full-time
Seeking a talented and motivated Full Stack Developer to join our technology team. The ideal candidate will be responsible for designing, developing, and maintaining scalable web…

Index Exchange

Principal Machine Learning Architect

Toronto, ON, Canada

Full-time

Apply About employer

Applications open in a new tab.

Job details

Job type: Full-time
Experience: We’re a proud industry pioneer with over 20 years of experience accelerating the ad technology evolution.
Posting language: English
Posted: Jul 11, 2026

Original job description

At Index Exchange, we’re reinventing how digital advertising works - at scale. We are a globally trusted independent supply-side platform, powering intelligent decisioning to maximize value for media owners and deliver stronger outcomes for buyers.

We’re a proud industry pioneer with over 20 years of experience accelerating the ad technology evolution. Our proprietary tech is trusted by some of the world’s largest brands and media owners and plays a crucial role in keeping the internet open, accessible, and largely free.

We process more than 550 billion real-time auctions every day (in comparison, Google processes about 14 billion searches per day) with ultra-low latency. Our platform is vertically integrated from servers to networks and runs on our own metal and cloud infrastructure. This end-to-end infrastructure is designed to provide both stability and agility, enabling us to adapt quickly as the market evolves.

At the core of it all is our engineering-first culture. Our engineers tackle internet-scale problems across tight-knit, global teams. From moving petabytes of data and optimizing with AI to making real-time infrastructure decisions, Indexers have the agency and influence to shape the future of advertising. We move fast, build thoughtfully, and stay grounded in our core values.

About The Role

This is a ripe opportunity for a Principal Machine Learning Architect to help a successful ad tech company leverage ML to further optimize our wealth of data and elevate our world-class platform to greater heights.

We have our first generation of successful ML projects live and are well on our way to our second. With Machine Learning continuing to mature, the ability to influence core architectures are huge and there are significant untapped business opportunities with our growing data and transaction volume. We are looking for a candidate with a track record of large-scale end to end ML solutions.

Here’s What You’ll Be Doing

Design, develop and implementation of complex data-centric solutions, including large data set verification, transformation, and feature generation
Ensure continuous high-quality input for ML model development
Design and implementation of model delivery systems
Develop effective strategies on deployment and hosting of ML models
Manage and monitor deployed models
Ability to deploy fast or real time inferencing a plus

Here's What You Need

Masters or PhD in a STEM field or equivalent experience in a Data Scientist or closely related role
Industry experience applying ML at scale
Extensive knowledge of production infrastructure and pipelines for ML models (MLOps)
Experience with several of the following: Classification, Regression, Pattern Recognition, Recommendation Systems, Targeting Systems, Ranking Systems
Experience with Python or other relevant programming languages and Machine Learning frameworks
Work on functional design, process design (including scenario design, flow mapping), prototyping, testing, training, and defining support procedures
Interest in performance optimizations
Deep knowledge of math, probability, statistics, and algorithms
Strong business acumen with the ability to work cross-functionally to source data, establish requirements and define success
Experience working with an advanced engineering team
Knowledge of best practices for software engineering
Bonus if you have a software engineering background
Published articles or papers

Nice To Have

Experience with participating in the machine learning competitions such as Kaggle
Experience in ad tech (i.e. knowledge of digital programmatic advertising data)

Why You’ll Love Working Here

Comprehensive health, dental, and vision plans for you and your dependents
Paid time off, health days, and personal obligation days plus flexible work schedules
Competitive retirement matching plans
Equity packages
Generous parental leave available to birthing, non-birthing, and adoptive parents
Annual well-being allowance plus fitness discounts and group wellness activities
Commuter benefits and discounts, where available
Employee assistance program
Mental health first aid program that provides an in-the-moment point of contact and reassurance
One day of volunteer time off per year and a donation-matching program
Monthly town halls and regular community-led team events
Multiple resources and programming to support continuous learning
A workplace that supports a diverse, equitable, and inclusive environment – learn more here

Equal employment opportunity

At Index Exchange, we believe that successful products are built by teams just as diverse as the audience who uses them. As such, we are committed to equal employment opportunities. We celebrate diversity of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or expression, or veteran status. Additionally, we realize that diversity is deeper than any status or classification - diversity is the human experience. For those who show grit, passion, and humility - Index will welcome you.

Accessibility For Applicants With Disabilities

Index Exchange welcomes and encourages individuals with disabilities to apply to work with us.

If you require an accommodation, please share the details of your request and any information how we can assist you with the hiring recruiter when they contact you. Index Exchange will make reasonable efforts to ensure accommodation requests are met throughout the recruitment process.

Index everywhere, Index anywhere

Our corporate headquarters are in Toronto, with major offices in New York, Montreal, Kitchener, London, San Francisco, and many other global cities. As a major global advertising exchange, we are committed to operating as a tightly knit global team and embracing and empowering talent wherever our colleagues may be.

AI Disclaimer: Automated tools including artificial intelligence may be used to assist in screening and assessing applicants for this role. All hiring decisions involve human review.

Vacancy Status: This posting is for an existing vacancy.

Apply About employer

More about this job

Responsibilities

Design and develop complex data-centric solutions for machine learning applications. Manage and monitor deployed models while ensuring high-quality input for model development.

Requirements

Candidates should have a Master's or PhD in a STEM field and extensive experience applying machine learning at scale. Knowledge of production infrastructure for ML models and experience with various ML techniques is essential.

Skills

Machine Learning
Data Science
MLOps
Python
Classification
Regression
Pattern Recognition
Recommendation Systems
Targeting Systems
Ranking Systems
Algorithms
Statistics
Probability
Software Engineering
Performance Optimization
Data Verification

Benefits

Health Insurance
Dental Insurance
Vision Insurance
Paid Time Off
Flexible Work Schedules
Retirement Matching Plans
Equity Packages
Parental Leave
Well-Being Allowance
Fitness Discounts
Commuter Benefits
Employee Assistance Program
Mental Health First Aid Program
Volunteer Time Off
Donation-Matching Program
Continuous Learning Resources

Visa sponsorship

Not detected in the job text

Keywords

Machine Learning
Data Science
MLOps
Python
Classification
Regression
Pattern Recognition
Recommendation Systems
Targeting Systems
Ranking Systems
Algorithms
Statistics
Probability
Software Engineering
Performance Optimization
Data Verification
Digital Advertising
Ad Tech
Real-Time Auctions
Infrastructure
Cloud
Data Transformation
Feature Generation
Model Delivery Systems
Deployment Strategies
Monitoring
Continuous Learning
Diversity
Equity
Inclusion

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