CareerPlan

Senior Software Engineer - Growth

Madrid OfficeFull-time2026-11-02 → 2026-11-10

Core

Design, build, and optimize onboarding flows, activation funnels, and trial conversion experiences to drive user growth.

Role type

Senior Full-Stack Engineer (Growth)

Builds

User-facing product experiences, onboarding funnels, and A/B test variations for a voice communications SaaS platform.

Domain

SaaS / Voice Communications / Growth Engineering

Deliverable

product features

Required skills

React, TypeScript, Node.js, AWS, PostgreSQL, API integration, A/B testing, product analytics

Preferred skills

Product-led growth experience, funnel optimization, scaling SaaS platforms

Technologies

React, TypeScript, Node.js, AWS, PostgreSQL, DynamoDB, Redis

Responsibilities

Design and implement activation funnels and onboarding flows; build and evaluate A/B tests; ship end-to-end code across frontend and backend; collaborate with Product and Data teams to convert insights into features; mentor team members on tech growth.