Senior Front-End Developer

Who you are

• Deep front-end expertise. Expert command of HTML, CSS, JavaScript/TypeScript, accessibility, and web performance, plus several years building production applications
• Proven web experimentation & CRO expertise. Hands-on experience architecting and shipping complex A/B, Multivariate Testing, and personalized web experiments with measurable conversion outcomes
• Experience with web experimentation and feature flag platforms (e.g. Kameleoon, Optimizely, VWO, LaunchDarkly) and product analytics tools (e.g. Amplitude, GA4)
• Strong Jamstack and modern front-end stack. Mastery of Next.js, React, TypeScript, and modern rendering strategies with a focus on performance and accessibility
• Experience working within a design system or maintaining a shared component library
• 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
• 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
• A growth and experimentation mindset. You're comfortable building for measurement and iteration, and you care about the business outcome your code drives
• Technical leadership without ego. You set standards and mentor others while staying collaborative and open to better ideas
• Strong communication. You collaborate easily with both technical and non-technical partners — designers, marketers, and CRO
• 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
• Comfort in the grey areas. You're adaptable, can prioritize amid ambiguity and changing priorities, and break large, complex problems into shippable pieces
• 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

What the job involves

• 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