Principal Design Engineer — AI-Driven Design System Lead

League; Toronto; Hybrid; CAD 140,000 - 190,000; Full time

Benefits offered by this job

Health benefits

Bonus program

Stock options

Unlimited PTO

Spending accounts

Wellness days

Growth opportunities

Mentorship program

Flexible working

Job summary

League is building the next generation of intelligent design systems for web, iOS, and Android. We’re seeking a Principal Design Engineer to own the bridge between design and code and to drive the design system end-to-end across platforms.

You’ll own tooling, theming, and the infrastructure enabling AI agents to build with consistency, while shipping production code and maintaining accessibility as a default. This senior IC role emphasizes craft, documentation, and cross-functional collaboration.

Qualifications

• 6+ years in a hybrid design/frontend role, frontend engineering, product design or design engineering.

Responsibilities

• Own and evolve the design system: component authoring, theming architecture, and parity between the design library and what ships in code.
• Own the tooling between design and code, including token pipelines, plugins, and automated checks that catch drift before people do.
• Build the infrastructure that lets AI agents use our design system correctly, including agent skills, reference documentation, and evals that measure whether the output holds up.
• Ship production code into the design system and the surfaces that consume it.
• Hold the cross-platform constraint across web, iOS, and Android, so one design decision serves all 3.
• Set the accessibility bar inside the system so teams inherit it by default.
• Own the open architectural questions about the system and drive each one to a decision.
• Document and teach your AI workflows so the whole design practice improves, not only your own output.
• Set the craft bar through what you ship, and build alignment with designers, engineers, and leads who don’t report to you.

Skills

React

TypeScript

Figma

Design systems

Accessibility

Documentation

AI agent integration

Tools

Node.js

Claude Code

Job description

League is building the next generation of intelligent design systems for web, iOS, and Android. We’re seeking a Principal Design Engineer to own the bridge between design and code and to drive the design system end-to-end across platforms.

You’ll own tooling, theming, and the infrastructure enabling AI agents to build with consistency, while shipping production code and maintaining accessibility as a default. This senior IC role emphasizes craft, documentation, and cross-functional collaboration.