Markham, On Lead python full stack data Jobs – 78 Openings This Week

Senior Data Scientist I
Relay —Toronto, ON
- $133,200–$162,800 a year
- Full-time
- Hybrid work
- SQL
- Python
Machine Learning Engineering Co-op
VCycene Inc. —Markham, ON
- $20–$25 an hour
- Full-time
- Computer Science
- Engineering
- C++
- Flexible schedule
Quick apply
5d
Senior Software Engineer
Guidewire Software —Toronto, ON
- $108,000–$135,000 a year
- Full-time
- Hybrid work
- Computer Science
- Engineering
- AWS
- Dental care
- Paid time off
2d
Senior DevOps Engineer
Kraft Heinz Company —Toronto, ON
- $118,600–$148,200 a year
- Azure
- DevOps
- Analysis skills
- Designated paid holidays
- Paid time off
Senior DevOps Engineer (Azure)
EPAM Systems, Inc. —Toronto, ON
- $105,000–$140,000 a year
- Computer science
- Azure
- Computer Science
- Employee stock purchase plan
- Disability insurance
Senior Backend Engineer, Entities
EvenUp —Toronto, ON
- $184,728–$249,926 a year
- Full-time
- Hybrid work
- Java
- C++
- Machine learning
- Designated paid holidays
- Disability insurance
Quick apply
4d
Sr. Machine Learning Engineer (Perception and Tracking)
Ouster —Toronto, ON
- $162,000–$180,000 a year
- Full-time
- C++
- Machine learning
- Computer networking
Director of Engineering
NuPort Robotics —Toronto, ON
- Part-time
- Computer science
- Doctoral degree
- Computer Science
1d
Senior Backend Engineer, AI Platform
EvenUp —Toronto, ON
- $158,525–$214,475 a year
- Full-time
- Hybrid work
- Java
- C++
- Machine learning
- Designated paid holidays
- Disability insurance
Quick apply
Senior Technical Product Marketing Manager
Fivetran —Toronto, ON
- $138,069.00–$155,327.50 a year
- Full-time
- Hybrid work
- Sales
- SQL
- Project management
- Paid time off
- Paid sick leave
Quick apply
Manager, Customer Analytics (Sales & Marketing)
Jobber —Toronto, ON
- $151,200–$204,500 a year
- Full-time
- Hybrid work
- Sales
- SQL
- Analysis skills
Engineering Manager, Research & Development
ACV Auctions —Toronto, ON
- $136,000–$171,000 a year
- Full-time
- Computer science
- Computer Science
- Engineering
- Employee stock purchase plan
- Disability insurance
Quick apply
Staff Back End Engineer (Applications)
Forma.ai —Toronto, ON
- Java
- Databases
- SQL
- Disability insurance
- Dental care
Quick apply
Manager, Financial Reporting
Purpose Unlimited —Toronto, ON
- $120,000–$135,000 a year
- Full-time
- Hybrid work
- Accounting
- AI
- Python
- Dental care
- Life insurance
Quick apply
Director of Engineering
TTEC Digital —Toronto, ON
- Full-time
- Remote
- Python
- Analytics
Quick apply
Senior Site Reliability Engineer
iManage —Toronto, ON
- Full-time
- Hybrid work
- Azure
- Engineering
- Java
- Dental care
- Paid time off
Quick apply
Sr. Software Engineer, Backend
Pinterest —Toronto, ON
- Hybrid work
- Computer science
- Computer Science
- Java

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Machine Learning Engineering Co-op
VCycene Inc. —Markham, ON
Currently enrolled in a co-op or internship program in Computer Science, Engineering, Mechatronics, Environmental Engineering, or a related field.
$20–$25 an hour
Quick apply
5d
Clinical/Data Operation Co-op (8 Month - Hybrid)
Oncoustics —Toronto, ON
In this dynamic clinical operations co-op position at Oncoustics you will gain hands-on experience in coordinating and optimizing clinical trials, ensuring…

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Machine Learning Engineering Co-op
VCycene Inc. —Markham, ON
Currently enrolled in a co-op or internship program in Computer Science, Engineering, Mechatronics, Environmental Engineering, or a related field.
$20–$25 an hour
Quick apply
5d

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Senior Data Scientist I

Relay -
Toronto, ON

Apply Now

Job details

Full-time
$133,200–$162,800 a year

Qualifications

SQL
A/B testing
Python

Full job description

Relay is a digital banking platform that gives self-made business owners the tools and know-how to be great with money—bringing clarity, confidence, and control to every dollar earned, so they can turn hard work into lasting success. We do this by replacing financial guesswork with real visibility, transforming cash flow from a constant source of stress into a clear signal owners can use to run stronger, more resilient businesses.

We're looking for a Senior Data Scientist to join our high-impact Data team. In this role you'll be responsible for elevating Relay's data capabilities — building predictive models, supporting experimentation across the organization, and helping the business make smarter, faster decisions. You will be a key strategic partner sitting at the intersection of data engineering and business intelligence, translating complex business questions into rigorous, actionable insights that move the needle across GTM, Sales, Finance, and Product.

Please note that we are a hybrid environment and choose to collaborate in the office three days a week (Tuesday–Thursday)

What You'll Be Doing

Own predictive modelling work across critical business domains — including customer lifetime value (LTV), churn, retention, and early-signal customer quality assessment
Support the rollout of Relay's experiment infrastructure to teams across the org, establishing rigorous A/B testing standards and helping the org make confident, data-driven decisions
Partner closely with GTM, Sales, Finance, and Product to translate ambiguous business questions into well-framed analytical problems with measurable outcomes
Define and improve core metric definitions so the business is working from a consistent, trustworthy foundation
Deliver stakeholder-facing insights and presentations that tell a compelling story through data — not just surface numbers, but explain what they mean and what to do next
Contribute to roadmap planning and influence prioritization decisions across the data team and cross-functional partners
Mentor junior data scientists and raise the bar for business-aligned, high-impact data science across the team

Who You Are

You have hands-on experience building and deploying predictive models (e.g., LTV, churn, lead scoring) and can walk through your methodology and the business impact it drove
You're deeply comfortable with SQL and Python, and can use them appropriately to run statistical analyses and solve complex problems
You bring strong business instincts — you understand why a metric matters, not just how to compute it, and you're energized by solving real stakeholder problems
You have experience with A/B testing and experimentation, can design experiments from first principles, and can communicate results in a way that's digestible to non-technical audiences
You thrive in ambiguous, fast-moving environments and have a track record of ramping quickly into new domains and delivering value within weeks, not months
You're a clear, confident communicator who can bridge the gap between technical work and business decisions — written, verbal, and visual
Familiarity with Snowflake and dbt is a strong plus; comfort working within a modern analytics stack is expected

The Interview Process

Stage 1: A 45-minute Google Meet video call with a member of the People Team
Stage 2: A 60-minute Google Meet video call with the Hiring Manager
Stage 3: A 45-minute in-person interview with a member of our Leadership team
Stage 4: A take-home case study, followed by a 60-minute Google Meet video call with members of our Data team.

Our Compensation Approach

We believe Relayers should feel rewarded for the impact they have on our mission and growth. Compensation follows impact. As impact increases, compensation grows, and we do not limit compensation changes to a once-a-year review cycle.

The annual salary range for this role is $133,200 - $162,800

For candidates who demonstrate full readiness for the defined scope of the role, the typical starting salary is $148,000. Offers below this point reflect candidates we believe can grow into the full scope of the role with support and development. Offers above this point reflect impact that meaningfully exceeds the role’s defined expectations or an expanded scope from day one.

We encourage you to have a conversation with your recruiter and ask questions about compensation throughout the hiring process. For more information on our compensation philosophy and perks and benefits, visit our Candidate Hub.

Why Relay Might Be the Perfect Fit For You

You push relentlessly for reinvention: You're always asking "how can this be better?" - in your work, in your craft, in yourself. Comfort is a signal to push harder, not coast. You'd rather build something better than defend something familiar.
You crave autonomy: We trust our team with big challenges and the freedom to solve them. If you’re someone who takes initiative, is comfortable taking risks, and seeks input when needed, you’ll find the freedom here empowering.
You own your work: You take pride in your work, follow through on commitments, and feel a deep sense of responsibility for outcomes, not just tasks.
You build with AI, not just use it: You're actively embedding AI into how you work, pushing what's possible, and bringing your team along with you.
You care about impact, not noise: You care deeply about the substance of your work. You measure success by results, not recognition, and you let your work speak for itself.
You’re energized by complexity and ambiguity: You enjoy tackling problems that don’t come with a playbook. You’re comfortable building from scratch, iterating as you go, and collaborating to shape the best path forward.
You seek out feedback: You see directness as respect, not criticism. You actively seek input, sit with hard truths, and use feedback as fuel for improvement.
Small businesses are why we're here: Relay exists to help them thrive - and that mission has to resonate with you.

Join Us

We're looking for people who are relentless, curious, and care deeply about the work. You're encouraged to apply even if your experience doesn't perfectly match the job description - your perspective and drive matter more. We welcome diverse backgrounds and people who think critically, challenge the status quo, and want to help small businesses thrive.

If you require accommodations at any stage of the hiring process, please reach out to your Talent Partner.

Disclaimer: For compliance reasons, all offers of employment at Relay are conditional upon a successful background check and employment verification through Certn.

Apply Now

Refine Your Search

lead python full stack data jobs in markham, on

Senior Data Scientist I

Machine Learning Engineering Co-op

Senior Software Engineer

Senior DevOps Engineer

Senior DevOps Engineer (Azure)

Senior Backend Engineer, Entities

Sr. Machine Learning Engineer (Perception and Tracking)

Director of Engineering

Senior Backend Engineer, AI Platform

Senior Technical Product Marketing Manager

Manager, Customer Analytics (Sales & Marketing)

Engineering Manager, Research & Development

Staff Back End Engineer (Applications)

Manager, Financial Reporting

Director of Engineering

Senior Site Reliability Engineer

Sr. Software Engineer, Backend

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