J
Jobber
Senior Front-End Developer (Web Experimentation)
Skills
NextReactTypescriptPHPAmplitudeData AnalysisAIWordPressOptimizelyFigmaJavascript
23 days ago
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Important information
Contract type:
Permanent
Salary:
$121,000 – $163,600 / year
Location:
Canada
Work mode:
Onsite
Published on:
28 September 2026
What they need
- We’re looking for a Senior Front-End Developer with deep web experimentation experience — to drive high-velocity A/B and multivariate testing across our web properties while elevating our technical architecture
- You’ll work across our modern Jamstack stack (Next.js, Sanity headless CMS, React, TypeScript) as well as our traditional headful WordPress platform (PHP, Twig templates), expanding our component libraries and engineering high-performance CRO frameworks.
- CMS familiarity is essential: you’ll build and optimize features across both modern headless APIs and legacy PHP/Twig codebases
- This is a senior individual-contributor role with real technical influence: you’ll set experimentation standards, mentor developers, and partner with the Engineering Manager on quality and site performance
- Just as importantly, we want someone who treats AI-assisted development as a core engineering skill
- We’re actively reshaping how we build — using AI coding agents, MCP-connected tooling, and automated workflows to move faster without sacrificing quality — and we want this person to help lead that evolution, not just keep up with it
- Engineer across a hybrid web stack — ship production features in Next.js, Sanity, and React with TypeScript, alongside ongoing support and enhancements for our headful WordPress (PHP/Twig) environment across getjobber.com
- Contribute to and extend our shared component library and design system so the team builds faster on consistent, reusable, well-tested foundations
- Own performance and accessibility as first-class requirements — Core Web Vitals, semantic and accessible markup, and fast, resilient page loads that directly support conversion
- Work seamlessly between headless and traditional CMS architectures — integrate APIs and structured content in Sanity while maintaining Twig-templated components in WordPress as we transition our web ecosystem
- Write well-tested, scalable, well-organized code and drive consistent engineering practices through code review
- Collaborate with our other developers on best technical practices and project decisions
- Use AI coding tools and agents fluently (e.g. Claude, AI-assisted IDEs, agentic workflows) to accelerate development while keeping a critical eye on output quality and reliability
- Improve how the team works with AI — building and refining MCP integrations, prompts, and context so our tickets, content, and codebase are AI-ready
- Help define and benchmark team standards for AI-assisted development — identifying what works, documenting it, and raising the whole team’s baseline
- Architect and execute complex A/B and multivariate experiments across high-converting marketing flows, partnering with CRO leads and data analysts to design statistically sound, performant test variants
- Build for experimentation velocity and statistical integrity — minimize flicker, ensure client/server-side rendering accuracy, and reduce time-to-market from test hypothesis to live variant
- Support SEO, LLM, and AI-search initiatives with the technical foundations (structured data, performance, rendering) that keep the site discoverable as search evolves
- Set patterns and technical direction for how we build, and bring the team along through pragmatic, well-reasoned decisions
- Mentor and coach other front-end developers, lifting their skills and holding the team to its engineering principles
- Partner with the Engineering Manager on technical standards, code quality, and architecture
- Identify and act on opportunities to improve the stack, tooling, and processes, and maintain strong team documentation- Hands-on AI-assisted development. You actively use AI coding tools in your day-to-day work and have a point of view on where they help, where they don’t, and how to use them responsibly
- Deep front-end expertise. Expert command of HTML, CSS, JavaScript/TypeScript, accessibility, and web performance, plus several years building production applications
- Strong communication. You collaborate easily with both technical and non-technical partners — designers, marketers, and CRO
- Technical leadership without ego. You set standards and mentor others while staying collaborative and open to better ideas
- Proven web experimentation & CRO expertise. Hands-on experience architecting and shipping complex A/B, Multivariate Testing, and personalized web experiments with measurable conversion outcomes
- Ambitious and humble. You don’t accept the status quo simply because “it’s what we’ve always done” — you push for better, newer, more innovative approaches while staying grounded
- Strong Jamstack and modern front-end stack. Mastery of Next.js, React, TypeScript, and modern rendering strategies with a focus on performance and accessibility
- Versatile CMS background (Headless Sanity & WordPress/Twig). Experience modeling content in headless CMS platforms (Sanity/Contentful) alongside hands-on proficiency in traditional WordPress, PHP, and Twig templates
- Comfort in the grey areas. You’re adaptable, can prioritize amid ambiguity and changing priorities, and break large, complex problems into shippable pieces
- A growth and experimentation mindset. You’re comfortable building for measurement and iteration, and you care about the business outcome your code drives
- Experience with web experimentation and feature flag platforms (e.g. Kameleoon, Optimizely, VWO, LaunchDarkly) and product analytics tools (e.g. Amplitude, GA4)
- Experience working within a design system or maintaining a shared component library
- Back-end familiarity. Comfort working beyond the front end: integrating APIs and services, or background experience with full-stack development
- Experience collaborating closely with designers in Figma
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