Senior Fullstack Engineer — Build AI-Driven B2B Platform

Samaipata; Barcelona; On-site; EUR 70,000 - 100,000; Full time

Benefits offered by this job

Pension Plan through Arca

Short Fridays all year round and extra

Birthday & Geneversary vacation days

Gym discount

Fresh fruit daily

Aticco office with views

Continuous learning & SaaS conferences

Job summary

Enginy AI, a Barcelona-based startup, is building an AI-native GTM platform for modern B2B teams. We seek an experienced Fullstack Engineer who will own features end-to-end, spanning backend workflows, integrations and a polished web frontend.

You’ll work on high-impact problems from product discussions to production, shaping systems and engineering standards as we scale in a fast-growing company.

Qualifications

• 5+ years of professional software engineering experience in both backend and frontend.
• Strong experience with TypeScript, Node.js and React.
• Solid understanding of modern API design and web architectures.
• Experience with relational databases (PostgreSQL or similar).
• Ability to work autonomously, debug complex issues and ship high-quality code.
• Strong communication skills and an advanced level of English.
• Bias for action and ownership in a fast-moving startup.

Responsibilities

• End-to-end features: ship complete functionality across backend and frontend with quality and speed.
• Backend services: build scalable services, async workflows and data pipelines (Temporal).
• Web product: develop responsive React + TypeScript dashboards and UIs.
• Performance & observability: optimize performance and keep the system observable.
• Product partnership: collaborate with Product and Design to scope work and trade-offs.
• Engineering standards: help shape coding practices and architecture as we scale.

Skills

TypeScript

Node.js

React

API design

Backend & frontend

English

Tools

Temporal

PostgreSQL

Redis

Elasticsearch

Kafka

GitHub Actions

Job description

Enginy AI, a Barcelona-based startup, is building an AI-native GTM platform for modern B2B teams. We seek an experienced Fullstack Engineer who will own features end-to-end, spanning backend workflows, integrations and a polished web frontend.

You’ll work on high-impact problems from product discussions to production, shaping systems and engineering standards as we scale in a fast-growing company.