Growth Engineer

Lully; Madrid; On-site; EUR 60,000 - 90,000; 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 page templates for VIP accounts, ensuring flawless asset delivery and zero layout shifts. You will implement advanced in-platform tracking, feed data into Salesforce, and own growth experimentation and server-side A/B testing to improve conversions.

Qualifications

• Proficient in React, Next.js (App Router), TypeScript, and Node.js
• Experience with headless CMS (Payload CMS preferred, Strapi or equivalent)
• Familiar with hosting on Vercel and edge-centric routing
• Strong knowledge of event tracking architectures (PostHog, Mixpanel, or Segment)
• Experience integrating data into enterprise CRMs (Salesforce)

Responsibilities

• Lead migration of marketing site and funnels from Webflow to a fast self-hosted frontend (Next.js/Vercel)
• Architect dynamic landing templates for VIP accounts with asset delivery and metrics
• Implement robust in-platform tracking for sales visibility
• Pipe event data from PostHog and outbound tools into Salesforce with clean API payloads
• Build and maintain growth experimentation infrastructure
• Design, launch, and analyze server-side A/B tests to optimize conversions

Skills

React

Next.js

TypeScript

Node.js

Payload CMS

Strapi

Vercel

PostHog

Salesforce

Tools

Vercel

PostHog

Mixpanel

Segment

Salesforce

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.