Growth Engineer: Self-Hosted Frontend & Growth Experiments

Lully; Barcelona; On-site; EUR 75,000 - 110,000; Full time

Job summary

Jobtailor is seeking a senior frontend engineer to migrate our marketing site and customer funnels from Webflow to a fast, self-hosted Next.js/Vercel frontend with Payload CMS. You will architect dynamic landing templates for VIP accounts, ensuring zero layout shifts and flawless asset integration.

You will implement in-platform tracking, connect event data to Salesforce, and maintain growth experimentation infra, while leading server-side A/B tests to optimize enterprise demo bookings.

Qualifications

• Extensive experience building from scratch without detailed specs.
• Deep mastery of React, Next.js App Router, TypeScript, and Node.js.
• Experience with modern headless CMS (Payload CMS/Strapi) and hosting on Vercel.
• Familiar with in-platform tracking and CRM data integration (PostHog, Salesforce).

Responsibilities

• Lead migration of marketing site and funnels from Webflow to Next.js/Vercel.
• Create dynamic landing templates for VIP accounts with zero layout shifts.
• Implement robust in-platform tracking to reveal data gaps.
• Pipe event data and traits from PostHog into Salesforce CRM with clean payloads.
• Build and maintain growth experimentation infrastructure.
• Design and analyze server-side A/B tests to boost conversions.

Skills

React

Next.js

TypeScript

Node.js

Payload CMS

Strapi

Vercel

Edge Middleware

PostHog

Mixpanel

Salesforce

API integration

Tools

Payload CMS

Strapi

Vercel

Edge Functions

Job description

Jobtailor is seeking a senior frontend engineer to migrate our marketing site and customer funnels from Webflow to a fast, self-hosted Next.js/Vercel frontend with Payload CMS. You will architect dynamic landing templates for VIP accounts, ensuring zero layout shifts and flawless asset integration.

You will implement in-platform tracking, connect event data to Salesforce, and maintain growth experimentation infra, while leading server-side A/B tests to optimize enterprise demo bookings.