Frontend Engineer

Our client is an exciting AI Start up company and they have an immediate need for a Frontend Engineer. This position will own the decision surface enterprise that senior leaders will act on every day. You will own that experience end to end: the widget and data-visualization system, the design system, and the onboarding and polish that make enterprise users want to live in the product every day. Responsibilities Own and evolve the decision surface: the SSR routes, the auth and session flow, and the overall front-end architecture. Build out the widget and data-visualization system: chart types, per-source breakdowns, color palettes, and an add-widget builder, driven by the front-end state layer. Shape the insights deck and Kanban: the surfaces where operators triage AI-detected insights, drag them across columns, assign owners, and work action-step and comment threads. Wire the front end to the backend data API, tuning the metric catalog, theming, and export layers. Define and grow a coherent design system: components, tokens, motion, and empty, loading, and error states, so new surfaces ship fast and feel consistent. Build onboarding and connection flows (OAuth-backed source connections, first-run experiences) that get a new enterprise tenant to first insight quickly. Partner directly with the Head of Engineering on product and UX decisions, and help define what polished means. Keep the front end honest with the multi-tenant model: every view is tenant-scoped and never leaks across boundaries. Requirements Strong TypeScript and React experience and a genuine eye for UI and UX; Real data-visualization sensibility; Experience building charts and dashboards and can reason about representing multi-source, time-series data clearly. Comfortable owning a front end end to end: component architecture, state management, performance, and accessibility. Experience integrating REST and JSON APIs and shaping and normalizing server data for the UI. Product instinct; you can take an ambiguous request to make a flow better and turn it into shipped, tested UI. Comfortable in a startup environment: high ownership, low ceremony, comfortable with early-stage ambiguity. Able to be in the Toronto office two days a week. Nice to Haves Experience with a modern SSR or islands framework and a utility-first CSS framework. Built or maintained a design system or component library. Familiarity with multi-tenant SaaS patterns (Postgres, row-level security). Exposure to the digital advertising or marketing-analytics domain. Comfort dipping into the Python backend when a feature needs it.

The role involves owning the end-to-end frontend experience, including the design system, data-visualization widgets, and onboarding flows. You will collaborate with the Head of Engineering to build a scalable, multi-tenant architecture for AI-detected insights.

Candidates must have strong TypeScript and React experience with a proven ability to build complex dashboards and data visualizations. A product-driven mindset and comfort working in an ambiguous, early-stage startup environment are essential.

• Data visualizationPreferred
• REST APIsPreferred
• ReactPreferred
• TypeScriptPreferred
• PythonPreferred

Identified from the job description. Confirm important requirements above.

• TypeScript
• React
• Data Visualization
• UI/UX Design
• State Management
• REST APIs
• JSON APIs
• Component Architecture
• SSR
• Design Systems
• Multi-tenant SaaS
• Python
• CSS Frameworks
• OAuth
• Frontend Architecture

• Software
• Technology
• Engineering
• Data & Analytics
• Creative & Media

Minimum experience

2+ years

Apply by

Sep 3, 2026

Posting language

English

Working hours

40 hours per week

Office presence

2 days per week

Seniority

Mid-Senior level

Application method

Direct apply is available