Lead Frontend Engineer

Location: Toronto, Ontario

Type: Full-Time

Compensation: $180,000-$250,000 CAD per year

Why Fulfil

Fulfil is a technical founder-led, bootstrapped company in our 11th year of operations. We're a small team of exceptional engineers powering millions of orders for brands like HexClad, Ridge Wallet, and Caraway. You won't be buried in meetings — you'll drive technical direction while still shipping code.

Why This Role Matters

Our platform powers critical operations for high-growth e-commerce brands. The frontend you build directly impacts how efficiently merchants manage accounting and inventory, fulfill orders, and serve their customers. Your work will be used by operations and accounting teams processing millions of transactions, requiring interfaces that are both powerful and intuitive.

What You’ll Own

• Own the frontend architecture and user interface development for our e-commerce operations and accounting platform.
• Build dynamic, server-driven interfaces using HTMX that integrate seamlessly with our Flask-based backend.
• Design and implement reusable UI components that serve complex business workflows, and ensure responsive, accessible interfaces across our entire application suite.
• Work directly with Python/Flask templates and backend code, requiring comfort with reading and occasionally writing Python to build cohesive full-stack features.
• Establish frontend coding standards, conduct code reviews, and optimize frontend performance for our high-traffic merchant dashboards.
• Integrate with our 600+ REST and GraphQL endpoints.
• Make independent architectural decisions while collaborating closely with backend engineers on API contracts and data flow.
• Provide technical guidance to other frontend engineers and drive frontend technical discussions.

Required Skills

• 5+ years of professional frontend development experience with proven architectural ownership
• Strong expertise in HTMX for server-driven dynamic interfaces (or similar: Alpine.js, Hotwire/Turbo)
• Proficient in modern HTML5, CSS3 (Flexbox, Grid, responsive design), and JavaScript (ES6+)
• Comfortable reading and writing Python code - you'll work with Flask, Jinja2 templates, and backend integration
• Experience with Flask or similar server-rendered frameworks (Django, Rails, Laravel)
• Strong understanding of RESTful APIs, JSON, and asynchronous data patterns
• Knowledge of web accessibility standards (WCAG) and cross-browser compatibility
• Experience with Git version control and code review processes
• Demonstrated ability to translate business requirements into frontend solutions independently

Preferred Skills

• Experience with CSS preprocessors (SASS/SCSS) or utility frameworks (Tailwind CSS)
• Familiarity with frontend build tools (Webpack, Vite, esbuild)
• Understanding of web performance optimization and debugging (Chrome DevTools, Lighthouse)
• Experience with automated testing (Jest, Playwright, pytest for integration tests)
• Knowledge of web security best practices (XSS, CSRF, CSP)
• Experience with CI/CD pipelines and deployment workflows
• Previous experience mentoring engineers or leading frontend initiatives

Tech Stack

• Frontend: HTMX, HTML5, CSS3, JavaScript (ES6+)
• Backend: Python, Flask, Jinja2
• Infrastructure: Kubernetes, Docker
• Version Control: Git

Hiring Process (We move fast)

• Initial interview — Technical leadership experience
• Live coding — Yes, leads still code here
• Interview loop — Architecture, mentorship, bar raiser
• Bootcamp — Leads also start in Product Support to learn how merchants use Fulfil

Our Approach to AI

What We Do

• Leverage LLMs (OpenAI API, Claude API) to embed AI-driven capabilities into Fulfil’s ERP, powering natural language interfaces, intelligent automation, and merchant-facing insights (e.g., Fulfil x MCP integrations with Claude).
• Focus on AI for commerce operations — integrating models to solve real problems like order management, financial analysis, customer insights, and logistics optimisation.

What We Don’t

• We are not a core ML/AI research company — we don’t train or fine-tune foundation models.
• We focus on integration and productization of AI, not building new ML frameworks or developing custom model architectures.
• What It’s Really Like to Work at Fulfil

We’re building the ERP that fast-growing eCommerce brands actually want to use, which means we’re taking on entrenched enterprise software with a small, intense team.

Big Tech and VC-backed startups are 400-horsepower engines running at 25% efficiency. They have bloated teams, endless meetings, six months to ship a feature. At Fulfil, we’re a 200-horsepower engine running at 100%. We’re bootstrapped, profitable, and growing steadily. No permission layers. No “alignment meetings” about alignment meetings. Everyone ships every day.

The work: You’ll own meaningful problems with direct customer impact. Our customers run 24/7 operations across time zones, and when they’re launching on BFCM or scaling from $10