Senior Backend Engineer — Build Scalable Platform (Hybrid/Remote)

JOIN; Barcelona; Hybrid; Confidencial; Full time

Benefits offered by this job

Apple hardware

Team events in Berlin

104 remote days per year

Hybrid policy

Relocation support

Job summary

JOIN is seeking a Backend Engineer to join our established engineering hub in Spain. You will help push forward our platform by improving architecture, raising quality, and building robust, scalable features used by thousands daily.

You will collaborate with Product, Platform, DevOps, and Frontend teams, uphold clean architecture, and participate in test-driven development to deliver measurable business value.

Qualifications

• 5+ years of backend development experience.
• 2+ years of experience with a strongly typed language or TypeScript.
• Strong experience with RDBMS (raw queries or via ORM).
• Solid background in unit and integration testing.
• Experience with message brokers (SNS, RabbitMQ, Kafka, Google Pub/Sub, etc.).

Responsibilities

• Collaborate with frontend engineers, product managers, and DevOps to build features.
• Conduct peer code reviews and contribute to retrospectives.
• Define technical requirements and identify best solutions to meet goals.
• Participate in engineering retrospectives focused on testing, architecture, automation, and coding standards.
• Deliver value and improve user experience for customers.

Skills

Backend development

TypeScript / strongly typed languages

RDBMS

Unit testing

Integration testing

SOLID principles

Node.js

GraphQL

GCP / AWS

gRPC / protobufs

RabbitMQ / Kafka / Pub/Sub

Tools

RabbitMQ

Kafka

Google Pub/Sub

SNS

PostgreSQL/MySQL

Job description

JOIN is seeking a Backend Engineer to join our established engineering hub in Spain. You will help push forward our platform by improving architecture, raising quality, and building robust, scalable features used by thousands daily.

You will collaborate with Product, Platform, DevOps, and Frontend teams, uphold clean architecture, and participate in test-driven development to deliver measurable business value.