Overview At Q-tech , we're looking for a Senior Java Engineer to join a general 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

📌 Senior Java Engineer (Remote within Spain) (Madrid)
🏢 Q-Tech
📍 Madrid