Senior React Developer to collaborate closely with product designers and back-end engineers to bring complex interfaces to life, establish front-end best practices, and mentor other developers for our financial services client.

S.i. Systems

Toronto, Ontario, Canada Permanent June 18, 2026

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Vacancy Description

Senior React Developer

Full Time/ Permanent

Location: Downtown Toronto, ON (4 days/week Onsite)

About the Role

We’re looking for a Senior React Developer who goes beyond writing code—you build exceptional user experiences. In this role, you’ll help shape the architecture, performance, and direction of modern front-end applications used at scale.

You’ll collaborate closely with product designers and back-end engineers to bring complex interfaces to life, establish front-end best practices, and mentor other developers.

What You’ll Do

Design and develop scalable React applications using modern patterns and best practices

Define and drive front-end architecture and technical standards

Translate complex UI/UX designs into high-quality, production-ready code

Optimize applications for performance, responsiveness, and accessibility

Mentor and support junior and mid-level developers<...

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Submit your application for Senior React Developer to collaborate closely with product designers and back-end engineers to bring complex interfaces to life, establish front-end best practices, and mentor other developers for our financial services client. at S.i. Systems

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Location Toronto, Ontario

Country Canada

Type Permanent

Category Computer Occupations

Posted June 18, 2026

Senior React Developer to collaborate closely with product designers and back-end engineers to bring complex interfaces to life, establish front-end best practices, and mentor other developers for our financial services client.

Vacancy Description

Ready to Apply?

Vacancy Details

About S.i. Systems

S.i. Systems

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