Senior React Developer to collaborate closely product designers and back-end engineers complex interfaces Job Toronto area,Ontario Canada

Position: Senior React Developer to collaborate closely with product designers and back-end engineers to bring complex interfaces

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

Collaborate cross-functionally to deliver high-quality features

What You Bring

Front-End Expertise

Deep experience with JavaScript and modern front-end development

Strong proficiency in React and its ecosystem

Solid understanding of component architecture and composition

Architectural Thinking

Ability to design scalable, maintainable front-end systems

Strong grasp of performance techniques (e.g., memoization, lazy loading)

Understanding of React internals, including rendering and reconciliation

Attention to Detail

High standards for UI quality, consistency, and accessibility

Ability to accurately translate design files into polished interfaces

State Management Experience

Experience with state management libraries such as Redux, MobX, Zustand, or Context API

Familiarity with Jotai is a plus (or willingness to learn quickly)

Performance Mindset

Experience profiling and optimizing front-end performance

Understanding of code-splitting, caching strategies, and load optimization

Awareness of both perceived and actual performance considerations

Tech Stack

React (Hooks, Context, Suspense)

TypeScript (preferred)

State management (Jotai preferred)

Build tools (Vite, Webpack, ESBuild)

Testing (Jest, React Testing Library)

Modern CSS solutions (CSS-in-JS or frameworks)

Git and CI/CD pipelines