Senior Front-End Developer, Web Experimentation

The role

A Senior Front-End Developer will drive high-velocity A/B and multivariate testing across web properties. You will work across a hybrid stack including Next.js, Sanity, React, TypeScript, and WordPress to improve conversion, SEO, and AI-driven discovery.

What you will do

• Engineer across a hybrid web stack using Next.js, Sanity, React, TypeScript, and WordPress
• Contribute to and extend the shared component library and design system
• Own performance and accessibility requirements including Core Web Vitals
• Integrate APIs and structured content in Sanity and maintain Twig-templated components in WordPress
• Write well-tested, scalable, well-organized code and perform code reviews
• Use AI coding tools and agents to accelerate development
• Improve team workflows with AI by building MCP integrations and refining prompts
• Architect and execute complex A/B and multivariate experiments
• Mentor and coach other front-end developers
• Partner with the Engineering Manager on technical standards and architecture

Required qualifications

• Expert command of HTML, CSS, JavaScript/TypeScript, accessibility, and web performance
• Several years building production applications
• Proven web experimentation and CRO expertise
• Experience with web experimentation and feature flag platforms (e.g., Kameleoon, Optimizely, VWO, LaunchDarkly)
• Experience with product analytics tools (e.g., Amplitude, GA4)
• Mastery of Next.js, React, TypeScript, and modern rendering strategies
• Experience working within a design system or maintaining a shared component library
• Experience modeling content in headless CMS platforms (Sanity/Contentful)
• Proficiency in traditional WordPress, PHP, and Twig templates
• Hands-on AI-assisted development using AI coding tools in day-to-day work
• Strong communication skills for collaborating with technical and non-technical partners

Nice to have

• Back-end familiarity including integrating APIs and services or full-stack development
• Experience collaborating closely with designers in Figma

Benefits

• Extended health benefits package with fully paid premiums for body and mind
• Matching in RRSP, TFSA or FHSA
• Stock options
• Annual stipends for health and wellness
• Dedicated talent development program including career coaching and leadership programs

About the company

Jobber helps small home service businesses like plumbers, painters, and landscapers transform how service is delivered through technology. The company provides tools to quote, schedule, invoice, and collect payments.