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Added 1 month ago
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Generative AI Engineer -Vice President
Citi
Mississauga, ON
- Full-time
We're searching for a highly skilled and experienced senior engineer and Python expert to lead the design and development of the various AI-related technologies as part of the Services Tech…
Added 1 month ago
Senior Software Engineer
BuildOps
Toronto, ON
We’re looking for a Senior Software Engineer to help build and scale the product experiences and systems behind that mission. In this role, you’ll work across frontend applications, backend…
Added 1 month ago
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Photonics Engineer - Systems Integration
Xanadu
Toronto, ON
- Full-time
Programming Aptitude: Basic proficiency in Python programming, with a strong willingness and aptitude to quickly learn lab automation and instrument control.
Added 1 month ago
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Machine Learning Data Engineer
kadence
Montreal, QC
- Full-time
If you’ve worked on LLM training data, large-scale NLP pipelines, foundation-model infrastructure or web-scale data processing, I’d be interested in speaking with you.
Added 1 month ago
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Photonics Control & Test Engineer
Xanadu
Toronto, ON
- Full-time
As a Photonics Control & Test Engineer, you will be responsible for developing the "brain" behind our measurement systems. Your primary focus will be following the entire designing cycle of…
Added 1 month ago
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AI Specialist - AI For Research
Xanadu
Toronto, ON
- Full-time
At Xanadu, we primarily work with GitHub, Python, AWS, Postgres, Docker, Terraform, and Claude. Proficiency in these technologies is essential.
Added 1 month ago
HC
Co-op Engineer - openJiuwen AI Agent Platform
Huawei Canada
Markham, ON
- Internship
Huawei Canada has an immediate co-op opening for an Engineer.
Added 1 month ago
MR
Senior Azure Cloud Engineer
Motion Recruitment
Toronto, ON
- $78 to $92 USD / hour
- Contract
This role will take ownership of designing and building enterprise-grade Azure environments, with a strong focus on security, scalability, resilience, and automation. You’ll work…
Added 1 month ago
CI
Lead Software Engineer, AI & Emerging Tech
CPP Investments | Investissements RPC
Toronto, ON
- Full-time
You’ll partner with cross-functional teams like Information Security, Engineering, Risk, Legal and Compliance teams to define and agree on AI platform controls, implement those controls…
Added 1 month ago
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Lead Agentic AI Engineer
HOOPP (Healthcare of Ontario Pension Plan)
Toronto, ON · CA ON Toronto
- $98,000 to $138,000 CAD / year
- Full-time
…financial future for the healthcare community. As a Lead Agentic AI Engineer, you will work directly with engineers, architects, security, governance, and business partners to find…
Added 1 month ago
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Principal AI Engineer
PointClickCare
Mississauga, ON
- $191,700 to $213,000 CAD / year
- Full-time
PointClickCare is searching for a Principal AI Engineer who will lead and design AI systems across multiple SaaS solutions following our AI Design Patterns, defining technical standards and…
Added 1 month ago
QA Engineer III
Zafin
Toronto, ON
The QA Engineer III will be responsible for leading and executing functional quality assurance activities for complex banking and financial applications. The role requires strong hands-on…
Added 1 month ago
FC
Portfolio Engineer
Fidelity Canada
Toronto, ON
- Full-time
The Managed Accounts Portfolio Engineer (“the engineer”) will be responsible for delivering repeatable portfolio construction and oversight capabilities. They will do this by building and…
Added 1 month ago
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Junior DevOps Specialist
CGI
Toronto, ON
- Full-time
As a DevOps Engineer on our team, you will drive key technical initiatives across the business, bridging the gap between software development and infrastructure operations. This role…
Added 1 month ago
Sr. AI Engineer (AI/ML Inference)
Dialpad
Vancouver, BC
As a Sr. AI Engineer: Systems, you’ll serve as an embedded senior back-end engineer on our Speech Team, owning the production systems that turn speech models and third-party capabilities…
Added 1 month ago
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Senior Founding Engineer, Frontend
Tyce
Toronto, ON
- Full-time
We start with the costliest problems general contractors face: the multi-million-dollar bidding and estimating decisions that off-the-shelf AI tools can't touch. Tyce is already live in…
Added 1 month ago
C
Principal/Team Lead, Digital Verification Engineer (FEC)
Ciena
Ottawa, ON
- Full-time
…plays a crucial role in our success. As a Digital Verification Engineer (FEC), you will be an integral part of a team responsible for implementing innovative verification strategies in…
Added 1 month ago
Principal Development Architect
SAP
Montreal, QC
At Customer Industry Solutions (CIS), with cloud and AI mindset, embedded in architecture and technology, we will Productize and scale Industry AI as repeatable, end-to-end agentic AI…
Added 1 month ago
AL
Senior Full-Stack Software Engineer
Altis Labs
Remote, Canada
- Full-time
- Remote
Altis Labs is recruiting a Senior Full-Stack Software Engineer with an entrepreneurial, product-focused mindset. You'll design and implement testable, scalable code as we expand our…
Added 1 month ago
MN
Intermediate Software Developer
March Networks
Remote, Canada
- Full-time
- Remote
March Networks is an established global leader in the video surveillance industry and works with the world’s largest retailers and banking institutions. Our goal is to create a positive…
Added 1 month ago
TA
Manager, Analytics Consulting (Retail/CPG)
Tiger Analytics Inc.
Remote, Canada
- Full-time
- Remote
Working familiarity with analytical tools such as Excel, SQL, BI/visualization tools and/or Python.
Added 1 month ago
FR
Lead Machine Learning Engineer - AI Innovation Teams
Fitch Ratings
Toronto, ON
- Full-time
Lead Machine Learning Engineer – AI Innovation Teams
Added 1 month ago
Senior Data Engineer, AI & Agents
Appnovation Technologies
Toronto, ON
As a Senior Data Engineer, AI & Agents, you will prepare enterprise domain data for consumption by AI agents, partnering directly with business stakeholders and subject-matter experts. The…
Added 1 month ago
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Senior Data Engineer / Ingénieur(e) de données senior
Flinks
Remote, Canada
- Full-time
- Remote
Technical Foundation: Expert SQL and strong Python skills, with the ability to build scalable, maintainable, and well-tested data solutions that support both operational and analytical…
Added 1 month ago
C
Software Engineer (Full Stack) - 6 Month Contract
Citylitics
Remote, Canada
- Contract
- Remote
…reliable sales intelligence. The platform integrates seamlessly with CRMs, ERPs, and data lakes, embedding actionable insights directly into sales workflows so teams can prioritize the…

kadence

Machine Learning Data Engineer

Montreal, QC, Canada

Full-time

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Applications open in a new tab.

Job details

Job type: Full-time
Experience: 5+ years of experience across machine learning engineering, data processing, NLP, data infrastructure or related areas.
Posting language: English
Posted: Sep 2, 2026

Original job description

Senior Machine Learning Data Engineer

Location: Canada

The Opportunity

This is an opportunity to work alongside a highly accomplished AI research team tackling fundamental problems in advanced machine learning.

Rather than maintaining established pipelines, you’ll be helping develop new approaches to training-data engineering and curation where established playbooks often do not yet exist.

The organization is building a substantial technical team in Montreal, and we are hiring multiple people across this area.

If you’ve worked on LLM training data, large-scale NLP pipelines, foundation-model infrastructure or web-scale data processing, I’d be interested in speaking with you.

We’re working with an ambitious AI research organization building next-generation machine learning systems and are looking for multiple Senior Machine Learning Data Engineers to join its growing technical team.

This role sits at the intersection of data engineering, machine learning, NLP, and large-scale training data curation.

You’ll be responsible for building and scaling the infrastructure that transforms raw, web-scale data into high-quality datasets used to train advanced AI models.

The core challenge is engineering data quality at enormous scale: developing filtering systems, model-based quality scoring, dataset transformations, contamination detection, and tooling that allows researchers to understand and work with training corpora effectively.

What You’ll Work On

Design, build and scale pipelines that transform raw web-scale data into high-quality datasets for training large machine learning models.
Process extremely large unstructured text corpora, including datasets at trillion-token scale.
Build sophisticated data-processing systems covering: Deduplication, Model-based quality scoring, Heuristic filtering, Toxicity and content-safety filtering, PII detection and removal, Metadata extraction, Dataset transformations, Versioning and provenance tracking
Develop automated data-quality systems using a combination of heuristics, ML classifiers, LLM-based evaluators and human-in-the-loop workflows.
Build monitoring and guardrails to identify data-quality regressions before they impact downstream model training.
Work closely with AI researchers to understand evolving training-data requirements and identify gaps within existing datasets.
Design robust evaluation contamination and data-leakage detection systems.
Build internal tools that allow researchers to easily explore, query and understand large datasets.
Optimize large-scale distributed processing systems for throughput, reliability and infrastructure cost.

What We’re Looking For

5+ years of experience across machine learning engineering, data processing, NLP, data infrastructure or related areas.
Experience working with very large unstructured text datasets, ideally at web or foundation-model scale.
Strong production-level Python.
Hands-on experience with distributed data-processing technologies such as: Spark, Ray, Flink
Experience designing and optimizing high-throughput distributed pipelines.
Experience with areas such as: PII scrubbing, Content-safety filtering, Dataset quality, Evaluation contamination, Training-data governance
Experience with workflow orchestration frameworks such as Airflow, Prefect or Dagster.
Ability to work closely with both research and engineering teams and translate research requirements into scalable infrastructure.

Particularly Relevant Experience

We’d be especially interested in people who have worked on:

Pretraining or post-training data pipelines for LLMs
Foundation-model training infrastructure
Web-scale text processing
Common Crawl or comparable large-scale datasets
Dataset curation for large language models
LLM-based data-quality evaluation
ML classifiers for filtering or scoring training data
Large-scale data acquisition
Dataset deduplication and contamination detection
Distributed ML/data infrastructure

Experience with vLLM, SGLang, Docker, Kubernetes, infrastructure-as-code, experiment tracking or open-source NLP/data tooling would also be valuable.

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More about this job

Responsibilities

Design and scale infrastructure to transform raw, web-scale unstructured text into high-quality datasets for training advanced AI models. Develop automated data-quality systems, filtering mechanisms, and internal tools to support AI researchers.

Requirements

Requires 5+ years of experience in machine learning engineering or data infrastructure with strong production-level Python skills. Must have hands-on experience with distributed processing technologies like Spark or Ray and working with large-scale unstructured text datasets.

Skills

Python
Spark
Ray
Flink
NLP
LLM Training Data
Distributed Data Processing
Airflow
Prefect
Dagster
Data Curation
Kubernetes
Docker
vLLM
SGLang
Data Pipeline Design

Visa sponsorship

Not detected in the job text

Keywords

Machine Learning
Data Engineering
NLP
LLM
Foundation Models
Web-scale Data
Deduplication
PII Detection
Content-safety Filtering
Common Crawl
Data Leakage Detection
Distributed Systems
Infrastructure-as-code
Experiment Tracking
Data Governance
Trillion-token Scale
Heuristic Filtering
Model-based Quality Scoring
vLLM
SGLang
Docker
Kubernetes
Airflow
Prefect
Dagster
Spark
Ray
Flink
Python
Data Pipelines

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