Growth Engineer

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

Responsibilities

• Lead the engineering effort to migrate our marketing site and customer funnels out of Webflow and into an ultra‑fast, self‑hosted frontend built on Next.js/Vercel and Payload CMS.
• Architect dynamic, programmatic landing page templates for high‑value VIP accounts that pull tailored assets, logos, and account metrics flawlessly without layout shifts or visual flicker.
• Implement best‑in‑class, in‑platform tracking that diagnoses existing data gaps and implements robust tracking so our sales teams have total visibility into what accounts are doing inside our platform.
• Seamlessly pipe event data and user traits from PostHog and outbound tooling directly down into Salesforce CRM, optimizing API payloads to maintain immaculate CRM data hygiene.
• Build and maintain our growth experimentation infrastructure.
• Design, launch, and analyze complex server‑side A/B tests that target key conversion loops and drive enterprise demo bookings.

Requirements

• Strong track record of building things entirely on your own from scratch. You don't wait for a perfectly detailed specification document—you see a gap in our process or tracking and you fix it.
• Deep technical mastery of React, Next.js (App Router), TypeScript, and Node.js.
• Direct experience building with modern, open‑source headless content management systems (ideally Payload CMS, Strapi, or equivalent developer‑first tools).
• Strong familiarity hosting applications on Vercel and utilizing Edge Middleware, Edge Functions, or CDN‑level routing to achieve 0ms‑latency personalization.
• Advanced knowledge of event tracking architectures using tools like PostHog, Mixpanel, or Segment.
• Experience managing data flows into enterprise CRMs (Salesforce) is highly desired.