Senior Full-Stack Engineer - Growth & Onboarding

Python; Madrid; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Competitive salary package

Work-life balance

Fast-learning environment

Cosmopolitan team - 45+ nationalities

Strong team spirit

Job summary

Aircall, a unicorn AI-powered communications platform, is seeking a Senior Full-Stack Engineer to join the Growth team. You will design, build, and iterate on onboarding and trial optimization to drive activation and conversions.

This role combines strong frontend expertise with solid backend capabilities, using React, Node.js, and TypeScript, hosted on AWS. You will ship end-to-end features, run experiments, and collaborate with Product, Designers, and Data Analysts to deliver value.

Qualifications

• Demonstrated frontend and backend experience with modern UI components and web apps.
• Strong knowledge of JS/TS ecosystem (React, Node.js, TypeScript).
• Familiarity with product analytics, funnels, and data-driven decisions.

Responsibilities

• Drive Acquisition & Onboarding: design, implement, and optimize activation funnels, trial experiences, and onboarding flows
• Rapid Experimentation: build, ship, and evaluate A/B tests and product feature variations using product analytics to measure impact
• End-to-End Ownership: ship high-quality code across the entire stack, from frontend interfaces to backend logic
• Cross-Functional Collaboration: partner with Product, Designers, and Data Analysts to create frictionless product experiences
• Create, design, develop, test, and monitor code in production autonomously and reliably
• Mentor and promote tech growth within the teams

Skills

Frontend development

Backend development

React

Node.js

TypeScript

Product analytics mindset

Conversion funnels

Tools

React

Node.js

TypeScript

AWS

PostgreSQL

DynamoDB

Redis

Job description

Aircall, a unicorn AI-powered communications platform, is seeking a Senior Full-Stack Engineer to join the Growth team. You will design, build, and iterate on onboarding and trial optimization to drive activation and conversions.

This role combines strong frontend expertise with solid backend capabilities, using React, Node.js, and TypeScript, hosted on AWS. You will ship end-to-end features, run experiments, and collaborate with Product, Designers, and Data Analysts to deliver value.