Senior Frontend Developer

Lumerate•Toronto, ON

31d•$120,000 - $130,000•Hybrid

About The Position

Lumerate is growing rapidly and we’re actively hiring for a Senior Frontend Developer based in the Greater Toronto Area to join our team! Who is Lumerate? We help our customers achieve the full picture of their industries. We also strive to achieve our own personal full pictures from a career fulfillment and learning perspective. We’re in the business of gathering intelligence about industries and delivering it to the right people within those industries through innovative software interfaces. Our vision is to be the world's most useful and trusted source of information for professionals seeking to understand what's happening in their industry. Our mission: To deliver industry awareness to an ever-increasing number of people, in whatever way helps them to make the most informed decisions, take the most immediate action and be the most awesome at their unique jobs. What the role looks like: Frontend architecture — React component patterns, state management strategy, styling conventions, and build tooling within a Rails monolith Component library (LDS) — maintaining and extending our internal design system built on Supernova design tokens and SCSS Migration strategy — incrementally moving legacy code (Reflux stores, createReactClass, jQuery) to modern React (hooks, Context, functional components) without large rewrites but pragmatic decisions to make small meaningful changes. Testing strategy — a three-tier JS testing approach using Jest + React Testing Library (unit/integration) and Playwright (UI/visual regression) Frontend standards — defining and enforcing patterns for component architecture, styling, data fetching, and code organization Developer experience — Storybook, module aliases, build performance, and tooling that helps the team ship faster

Requirements

5+ years with React in production, with deep knowledge of hooks, Context, component composition patterns (compound components, render props, forwardRef/useImperativeHandle)
Experience working within a server-rendered framework (Rails, Django, Laravel, or similar)
Strong CSS/SCSS skills — you can architect a design token system, write maintainable component styles, and make sound decisions about when to use utility classes vs. semantic SCSS
Testing expertise — Jest, React Testing Library, and ideally Playwright or Cypress. You test behavior, not implementation details
JavaScript fundamentals — ES modules, async/await, Proxy, private class methods, build tooling (Webpack/Vite).

Nice To Haves

Frontend senior developer with 5+ yrs of experience
Has experience working closely with the design team and with junior developers
Experience with Rails + React (Webpacker/Shakapacker)
Track record of technical leadership — you've defined frontend standards, run code reviews, and mentored developers.
Migrated legacy frontend code (jQuery, Backbone, Reflux, class components) incrementally
Experience with design system development (component libraries, Storybook, design tokens)
Performance optimization (bundle splitting, lazy loading, render profiling)
Accessibility (WCAG compliance, semantic HTML, ARIA patterns)

Responsibilities

Frontend architecture — React component patterns, state management strategy, styling conventions, and build tooling within a Rails monolith
Component library (LDS) — maintaining and extending our internal design system built on Supernova design tokens and SCSS
Migration strategy — incrementally moving legacy code (Reflux stores, createReactClass, jQuery) to modern React (hooks, Context, functional components) without large rewrites but pragmatic decisions to make small meaningful changes.
Testing strategy — a three-tier JS testing approach using Jest + React Testing Library (unit/integration) and Playwright (UI/visual regression)
Frontend standards — defining and enforcing patterns for component architecture, styling, data fetching, and code organization
Developer experience — Storybook, module aliases, build performance, and tooling that helps the team ship faster

Benefits

Help shape the future of a bootstrapped and profitable Canadian tech company
Earn yourself some equity (employee options make up 20% of the value of the company at all times)
Be a part of a tightly-knit team with a thriving hybrid culture
Three weeks paid vacation + paid statutory holidays
If based in Toronto, enjoy a dedicated work space at our open-concept office (located in the Junction Triangle) and enjoy the benefits of in-person interactions with colleagues 3 days per week
Upgrade your home office setup with our remote or hybrid stipend
Join us for our annual all-company retreat (past destinations include Bermuda, Iceland, Costa Rica, and Portugal)
Earn additional paid vacation days with continued learning ($1000 annual stipend for courses and classes)
Take part in our Employee Giving Program (you choose the causes and the company provides the funds)
Basic and extended health and dental benefits
Paid and topped-up maternal and parental leave