St. Catharines On Senior engineer Jobs – 13 Openings This Week

Senior QA Engineer
Rentsync —St. Catharines, ON
- $70,000–$90,000 a year
- Full-time
- Software troubleshooting
- Analysis skills
- JavaScript
Quick apply
Senior Mechanical Engineer, P.Eng - Heavy Fabrication
Aplin —Niagara Falls, ON
- $140,000–$160,000 a year
- Engineering
- Bachelor's
- Continuous improvement
Quick apply
12d
Senior Project Manager - Facilities
City of St. Catharines —St. Catharines, ON
- $108,563–$127,000 a year
- Full-time
- Hybrid work
- PMP
- Customer service
- Engineering
- Dental care
- Vision care
Senior Mechanical Designer
SWS Warning Lights Inc —Niagara Falls, ON
- From $75,000 a year
- Full-time
- Research
- Welding
- Manufacturing
Quick apply
Technicien senior en structure de bois/senior truss designer
Structure du Nord 2016 —Canada
- From $28.73 an hour
- Full-time
- Remote
- Master's degree
- Organizational skills
- Communication skills
- Dental care
- Paid time off
Quick apply
Senior Manager, Project Delivery – USRC
Metrolinx —Canada
- $140,764 a year
- Full-time
- Civil engineering
- Engineering
- Analysis skills
Senior Mechanical Engineer, SME (Rotating Equipment)
Morson Talent (Canada & USA) —Canada
- $85–$100 an hour
- Remote
- Engineering
- Mechanical knowledge
Quick apply

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Senior Mechanical Engineer - AI Trainer
DataAnnotation —Thornhill, ON
Knowledge of design engineering, dynamics and controls, heat transfer, fluid mechanics, thermodynamics, mechanical design, manufacturing processes, and related…
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Transmission Line Engineering Team Lead
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Benefits Summary: Regular full-time and part-time employees (working at least 20 hours per week) will have access to health, dental, and vision plans, a…

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Senior QA Engineer

Rentsync -
St. Catharines, ON

Quick apply

Job details

Full-time
$70,000–$90,000 a year

Qualifications

CI/CD
Quality assurance test automation development
Software troubleshooting
RESTful API
Lean
Analysis skills
Software quality assurance
JavaScript
Quality Control
TypeScript
Debugging

Full job description

About Rentsync:
Rentsync is an award-winning, high-growth organization that provides high quality websites, marketing services, and software solutions to the rental and property management industry throughout Canada and the United States.

About the Role:

We're building the products that will define the next decade of rental housing technology, and we need a senior QA Engineer embedded in the team building them. You'll define what quality means for products that are genuinely new, build the systems to measure it, and own the testing approach end to end. You'll work across two very different surfaces: established web platforms with the functional and regression rigor you'd expect, and newer AI infused products whose behavior isn't fully predictable, where "correct" isn't a single expected output.

What you'll test:

Conversational and interactive products where the same input can produce different outputs from one run to the next, testing for quality, consistency, and safe failure rather than one "right" answer
Core web platforms across the rental housing / proptech landscape: functional, regression, cross-browser, and performance testing
The integrations and data flows that connect them

Tools you may work with:

Playwright · TypeScript / JavaScript · REST API testing · CI/CD pipelines · and the freedom to bring in whatever modern tooling scales your coverage

Duties & Responsibilities:

Own the testing strategy and approach for the team's products, end to end
Design, build, and maintain automated test suites in Playwright and TypeScript
Define what "good" looks like for open-ended outputs, where there's no single expected result, and build the evaluation frameworks, scorecards, and regression harnesses that measure it objectively over time
Establish quality standards, test practices, and review habits the wider team adopts
Lean on a modern, fast-moving toolchain to multiply your coverage; you reach for automation and assistive tooling rather than testing everything by hand
Run exploratory and manual testing where human judgment matters most
Partner with engineers and product from design through release; shift quality upstream rather than catching problems at the end
Triage, reproduce, and clearly document defects, and track quality signals through to production
Integrate testing into CI/CD to give the team confidence to ship quickly

Required Knowledge, Skills & Abilities:

Strong hands-on test automation with Playwright (or a comparable modern framework) in TypeScript / JavaScript
Comfort testing systems with variable or non-deterministic behavior; you're energized, not frustrated, by problems that don't have one correct answer
Experience defining quality for subjective or open-ended outputs: what makes a result complete, accurate, on-tone, and safe
Fluency with a modern testing toolchain, and a habit of adopting new tools quickly to scale what one person can cover
Senior-level communication: you can set a quality bar with engineers and explain a risk trade-off to a stakeholder in the same conversation
Strong analytical, debugging, and problem-solving skills

Essential Qualifications

5+ years in QA or quality engineering, including building and maintaining automated test suites
A track record of owning quality for a product or product area end to end, not just executing test plans

Additional Preferred Qualifications

Automated API testing experience
Experience integrating test suites into CI/CD pipelines
Experience testing conversational, chat, or natural-language interfaces
Exposure to building evaluation datasets, scorecards, or quality benchmarks for product outputs
Background in PropTech, marketplaces, or high-volume consumer platforms

Rentsync is an equal opportunity employer. If you are selected to participate in the interview process and require unique accommodations, please don’t hesitate to let us know.

Successful candidates may be required to complete a criminal background check in the final phase of the interview process.

This is an open-ended job posting and may not represent a specific vacancy within the organization.

Rentsync reserves the right to use Artificial Intelligence to screen and/or assess candidates.

The pay range for this role is:
70,000 - 90,000 CAD per year(Canada)

Pay: $70,000.00-$90,000.00 per year

Quick apply

Refine Your Search

senior engineer jobs in st. catharines on

Senior QA Engineer

Senior Mechanical Engineer, P.Eng - Heavy Fabrication

Senior Project Manager - Facilities

Senior Mechanical Designer

Technicien senior en structure de bois/senior truss designer

Senior Manager, Project Delivery – USRC

Senior Mechanical Engineer, SME (Rotating Equipment)

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