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# Senior Java Engineer (Remote within Spain)

- **Company:** Q Tech
- **Location:** Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Software as a Service, Continuous Integration, PostgreSQL, Node.Js, Backend, Build Management, Codebase, Domain Driven Design
- **Published:** October 12, 2026
- **Apply:** https://www.jobleads.com/es/job/senior-java-engineer-remote-within-spain--spain--e0353c8a05f7b404b98d77fb0dec433e9

## About the Role

* 6+ years of experience working with Java in complex or high-reliability environments
 * Strong expertise with Spring and the ability to design services from scratch
 * PostgreSQL experience is a must (data modelling, performance, migrations, consistency)
 * Solid understanding of clean/hexagonal architecture, domain-driven thinking and tactical patterns
 * Strong testing mindset and familiarity with CI/CD and engineering best practices
 * Ability to review, challenge and elevate the team's technical decisions
 * Experience working with existing codebases and migrating functionality is a plus (some parts currently in Node.js)
 * Autonomy to make technical decisions without constant oversight
 * Good communication skills and a collaborative mindset
 * Based in Spain (remote)
 * Experience collaborating with distributed and multicultural teams

## Description

Overview

At Q-tech, we're looking for a Senior Java Engineer to join a global SaaS product that's scaling fast and moving into a more mature, reliability-focused phase.

The platform handles a high volume of data and workflows used by customers across multiple countries. The team is strengthening its foundations to ensure stability, consistency and long-term scalability - and they're looking for someone who can take a leading role on the Java side.

You'd become the Java reference point: someone who can set technical direction, build new services with Java + Spring + PostgreSQL, and help elevate the platform's engineering standards. There's also some existing functionality in Node.js, and part of the work involves gradually moving that logic into the new Java-based architecture.

This isn't a "ship fast and patch later" environment. Quality matters: clean architecture, solid testing, strong patterns, observability, and a product that needs to behave predictably for demanding clients.

What you'll do

 * Design and build backend services using Java + Spring
 * Bring architectural vision, patterns, and best practices
 * Help migrate existing Node.js components into the new Java stack
 * Work with clean/hexagonal architecture and rich domain models
 * Collaborate with a senior team and a technically strong CTO
 * Make autonomous technical decisions that shape the platform

Requirements

 * 6+ years of experience working with Java in complex or high-reliability environments
 * Strong expertise with Spring and the ability to design services from scratch
 * PostgreSQL experience is a must (data modelling, performance, migrations, consistency)
 * Solid understanding of clean/hexagonal architecture, domain-driven thinking and tactical patterns
 * Strong testing mindset and familiarity with CI/CD and engineering best practices
 * Ability to review, challenge and elevate the team's technical decisions
 * Experience working with existing codebases and migrating functionality is a plus (some parts currently in Node.js)
 * Autonomy to make technical decisions without constant oversight
 * Good communication skills and a collaborative mindset
 * Based in Spain (remote)
 * Experience collaborating with distributed and multicultural teams

What the role offers

 * Become the go-to Java expert in the company
 * Build critical components from scratch
 * A real technical challenge with direct product impact
 * A stable environment focused on doing things properly
 * Remote work from anywhere in Spain + optional offices in several cities