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Applied Scientist, Amazon Canada Technology, Amazon Canada
Amazon Science
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Do you want to solve unique challenges specific to the Canadian market? Are you looking to make an impact on a digital commerce landscape through science?
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Amazon Science

Applied Scientist, Amazon Canada Technology, Amazon Canada

Vancouver, BC, Canada

Full-time

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Job details

Job type: Full-time
Apply by: Nov 23, 2026
Experience: 3+ years of building models for business application experience
Posting language: English
Posted: Oct 27, 2026

Original job description

Description

Do you want to solve unique challenges specific to the Canadian market? Are you looking to make an impact on a digital commerce landscape through science?

We are hiring an Applied Scientist to join Amazon Canada Technology and push the science boundaries for Canada: the reasoning LLMs, embedding models, cross-encoder rankers, and multi-objective optimization systems that turn billions of products into the right answer for hundreds of millions of Canadian customers. The role spans the full model lifecycle, from understanding and deciphering where the problem lies, building models, mid-training reasoning models on data such as shopping, returns, reasoning, localization to aligning the models with customers on dimensions that matter for shopping through fulfillment. You will be a pioneer on this team and will own defining the long-term Science strategy and execute on the same by partnering closely with several partner teams such as Core Search, Returns and work with CA Product Managers, Software Engineering and BI/DEs.

Key job responsibilities

Develop personalized multi-modal thinking-LLM techniques that reason about customers, search, queries, ranking and products across both primary and secondary languages.
Train large language models on various data signals and sets: domain-adaptive continued pre-training, reinforcement learning shopping reasoning traces, instruction tuning for natural-language shopping queries.
Analyze Canada (CA) ranking-quality gaps using offline metrics and benchmark CA model staleness and architecture against other marketplace (e.g. US, EU, JP) equivalents.
Formulate falsifiable ranking hypotheses linking a specific feature, architecture, or training change to predicted metric movement.
Run standardized offline evaluation of model candidates; validate feature statistical distributions and coverage in-locale to detect anomalies; own and lead experiments to drive improvements on offline and online experiment benchmarks.
Lead error analysis on failing query segments and segment-level deep dives (head/torso/tail, category, device), surfacing CA-specific failure modes such as bilingual and thin-category gaps.
Own metric-tradeoff analysis and acceptable-regression boundaries, bridging model behavior and CA business priorities.
Partner with teams such as Core Search on hypotheses, model training, and quality gates (MTBR / WLBR / SSAI).
Classify feature-expansion effort tiers (available / pipeline extension / locale training / infeasible) combining locale knowledge with science judgment.

About The Team

Amazon.ca Technology builds the products and services millions of Canadians rely on every day. Our teams tackle challenges unique to the Canadian market while contributing to Amazon initiatives that span the globe - giving you the best of both worlds: meaningful local impact and the scale of global tech. If you want to help shape Canada's digital commerce landscape within a collaborative Canadian work culture, this is the place to do it.

Basic Qualifications

3+ years of building models for business application experience
Experience in CS, CE, ML or related field
Experience programming in Java, C++, Python or related language
Experience in any of the following areas: algorithms and data structures, parsing, numerical optimization, data mining, parallel and distributed computing, high-performance computing

Preferred Qualifications

Experience using Unix/Linux
PhD, or a Master's degree and experience in CS, CE, ML or related field
Experience in understanding performance metrics and developing them to measure progress against key performance indicators

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status, disability, or other legally protected status.

Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process, including support for the interview or onboarding process, please visit https://amazon.jobs/content/en/how-we-hire/accommodations for more information. If the country/region you’re applying in isn’t listed, please contact your Recruiting Partner.

The base salary range for this position is listed below. As a total compensation company, Amazon's package may include other elements such as sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience, qualifications, and location. Amazon offers comprehensive benefits including health insurance (medical, dental, vision, prescription, basic life & AD&D insurance), Registered Retirement Savings Plan (RRSP), Deferred Profit Sharing Plan (DPSP), paid time off, and other resources to improve health and well-being. We thank all applicants for their interest, however only those interviewed will be advised as to hiring status.

CAN, BC, Vancouver - 149,300.00 - 249,300.00 CAD annually

CAN, ON, Toronto - 149,300.00 - 249,300.00 CAD annually

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More about this job

Responsibilities

Develop and evaluate personalized, multimodal language models and ranking systems for Canadian shopping, including training models on shopping data and analyzing Canada-specific quality gaps. Lead experiments, error analysis, metric trade-off decisions, and science strategy in partnership with search, product, engineering, and data teams.

Requirements

Requires at least three years of experience building models for business applications, a background in computer science, computer engineering, machine learning, or a related field, and programming experience in Java, C++, Python, or a similar language. Experience in areas such as algorithms, numerical optimization, data mining, or distributed computing is required; Unix/Linux experience and a master's degree or PhD are preferred.

Skills

Applied Science
Machine Learning
Large Language Models
Model Training
Ranking Systems
Search
Multi-Objective Optimization
Reinforcement Learning
Data Analysis
Experimentation
Statistical Analysis
Python
Java
C++
Algorithms and Data Structures
Distributed Computing

Benefits

Health Insurance
Medical Insurance
Dental Insurance
Vision Insurance
Prescription Coverage
Basic Life Insurance
Accidental Death and Dismemberment Insurance
Deferred Profit Sharing Plan
Paid Time Off

Visa sponsorship

Not detected in the job text

Keywords

Applied Science
Machine Learning
Large Language Models
Reasoning Models
Embedding Models
Cross-Encoder Rankers
Multi-Objective Optimization
Model Training
Domain-Adaptive Pretraining
Reinforcement Learning
Instruction Tuning
Personalization
Multimodal Models
Search Ranking
Offline Evaluation
Online Experiments
Error Analysis
Statistical Metrics
Performance Metrics
Algorithms and Data Structures
Numerical Optimization
Data Mining
Parallel Computing
Distributed Computing
High-Performance Computing
Python
Java
C++
Unix/Linux
Bilingual Localization

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